Water extinguishing system and method to control a pump test run in a water extinguishing system

Abstract

The invention relates to a water extinguishing system (1) with a fluid supply (10) for providing an extinguishing fluid, a pump (20) configured to pump the extinguishing fluid from the fluid supply (10) into a supply line (2) of a pipe system (500) of the water extinguishing system (1), a test line (3) branching off from the supply line (2) and configured to direct the extinguishing fluid pumped by the pump (20) away from the pipe system (500), and a fluid diversion (4) having a reduced cross-section compared to the test line (3), wherein the fluid diversion (4) is configured to direct a predefined proportion of the extinguishing fluid around an opening element (31) of the test line (3) away from the pipe system (500), wherein the water extinguishing system (1) further comprises at least one control device (21, 211, 212, 23, 41, 53) configured to control at least one to determine a parameter that is indicative of the cross-section of the fluid diversion (4),and to control a pump test run of the pump (20) based on the parameter. The invention further relates to a corresponding control device and a method for controlling a corresponding pump test run.

Description

[0001] The present invention relates to a water extinguishing system and a method for controlling a pump test run, in particular in a water extinguishing system.

[0002] Water extinguishing systems within the meaning of the invention are in particular sprinkler, water spray and foam extinguishing systems, whereby the invention is not limited to particular types of water extinguishing systems.

[0003] The present invention relates in particular to water extinguishing systems comprising a fluid supply for providing an extinguishing fluid, a pump configured for pumping the extinguishing fluid from the fluid supply into a supply line of a pipe system of the water extinguishing system, and a test line branching off from the supply line of the pipe system and configured to direct the extinguishing fluid pumped by the pump away from the pipe system. The test line has an opening device configured to be movable between a locking position, in which the opening device closes the test line, and an unlocking position, in which the opening device opens the test line. The water extinguishing system also includes a fluid diversion having a reduced cross-section compared to the test line, wherein the fluid diversion is configured to direct a predefined proportion of the extinguishing fluid around the opening device and away from the pipe system.

[0004] In this context, fluid supply refers to a combination of one or more elements that serve to supply the water-based fire extinguishing system with extinguishing fluid. The fluid supply can, in particular, include a drinking water supply from which drinking water can be supplied to the water-based fire extinguishing system as extinguishing fluid. Alternatively or additionally, the fluid supply can include a storage tank in which the extinguishing fluid can be stored.

[0005] Such water-based fire suppression systems and their testing are described, among other things, in VdS Guideline 2212 "Operating Manual for Water-Based Fire Suppression Systems." This guideline defines a test line as a water measuring device comprising a flow meter, calming sections, and regulating valves for testing the water flow rate. The test line is preferably provided as a branch from the supply line to the water-based fire suppression system's pipework, in particular as a branch from the distribution pipe downstream of the pump, which supplies the pipework. A distribution pipe is specifically a pipe that either directly feeds a riser pipe or a single sprinkler on a riser pipe that is not an end pipe and is longer than 300 mm. The pipes that supply the pipework system thus form the supply line to the pipework system.

[0006] It is known from the VdS 2212 guideline that the test line serves to perform a so-called pump test run, in which the functionality of the water extinguishing system's pump can be tested. For this purpose, the test line includes an opening device. An opening device is understood here to be, in particular, a sliding element within an opening unit, such as a valve, which, according to the state of the art, can be manually operated. Opening is effected by moving the sliding element from a locked to an unlocked position. For the pump test run, the opening device in the test line is opened. This allows a flow of volume through the test line, by means of which a pump test run can be carried out. Closing is then effected by moving the sliding element from the unlocked position to the locked position. This interrupts the flow of volume through the valve again.The test line is therefore the line that is used to form a test circuit in the case of a manually performed pump test run.

[0007] For this purpose, the test line is opened for the duration of the pump test run, and the supply of extinguishing fluid to the pipe system is simultaneously shut off. This ensures that the extinguishing fluid remains within the test circuit established by the test line during the test run. The extinguishing fluid is routed away from the pump through the test line and then either into a suitable extinguishing fluid reservoir and / or into a drain. No extinguishing fluid is introduced into the pipe system during this process. Only after the pump test run is complete is the test line closed again and the fluid supply to the pipe system restored. The extinguishing fluid can then re-enter the pipe system.

[0008] A fluid diversion is an additional line provided alongside the test line, which can branch off either from the supply line to the pipe system or from the test line itself. The fluid diversion is characterized by having a cross-section that is significantly smaller than that of the test line. In some embodiments, the cross-section of the fluid diversion corresponds to, for example, only 2 to 10% of the cross-section of the test line, and in other embodiments even less. Typically, the cross-section of the fluid diversion is selected to carry, in particular, 2% of the pump's flow rate. The fluid diversion is also referred to as an emergency bypass line. The fluid diversion is designed such that it carries the extinguishing fluid pumped away from the pipe system even when the opening mechanism in the test line is in the closed position.The fluid diversion serves to direct the extinguishing fluid away from the pipe system and around the opening mechanism.

[0009] A water extinguishing system with a test line and fluid diversion is disclosed in document JP S57 72664 A.

[0010] The term "firefighting fluid" refers to a fluid used for extinguishing and / or fighting fires. This firefighting fluid can be, in particular, water, supplied with or without additives. In some formulations, the firefighting fluid may contain a foam, an antifreeze agent, or similar substances. The additives should, where possible, be selected to be optimal for the specific application of the water-based fire suppression system. In some formulations, the firefighting fluid may also be pure water. Other types of firefighting fluids are also conceivable.

[0011] Water-based fire suppression systems of the aforementioned type are subject, among other things, to the regulations also described in VdS 2212. In particular, section 1.3.4 of VdS 2212 stipulates weekly inspections of the water-based fire suppression system by the system operator. These weekly tests include, among other things, checking the pump start-up of the pump that delivers the extinguishing fluid. For this purpose, a so-called pump test run must be performed, which must continue until the pump's normal operating parameters are reached.

[0012] For this purpose, water-based fire suppression systems typically use a test line, which allows for pump testing and prevents the extinguishing fluid from flooding the areas monitored by the system during the weekly required pump test. This test line can be opened for the pump test run using the opening device and closed again afterward. This allows for a kind of "test circuit" to be provided for the duration of the pump test, thus avoiding flooding the monitored areas.

[0013] In some water-based fire suppression systems, the test line is designed to return the extinguishing fluid flowing through it to a storage tank and / or an intermediate tank that is part of the fluid supply system. This allows the extinguishing fluid passed through the test line during the pump test run to continue being used by the water-based fire suppression system. In some water-based fire suppression systems, the extinguishing fluid passed through the test line is also directed to a wastewater tank and / or discharged via a wastewater pipe and not stored.

[0014] The fluid diversion system can also be configured to direct the extinguishing fluid flowing through it back into the storage tank and / or an intermediate tank. Alternatively, the fluid diversion system can be configured to direct the extinguishing fluid flowing through it into a wastewater tank and / or discharge it into a wastewater pipe and / or otherwise remove it from the pipe system, thus preventing it from being reused in the fluid supply.

[0015] In accordance with current best practices, the weekly pump test run is performed manually by a trained person. First, the test line is opened by disengaging the valve. Then, a starting device is used to initiate a pump start. This start can be automatic or manual. The starting pressure, which corresponds to the pressure at the moment the pump starts, is then measured and recorded. The test run continues until the pump's drive motor reaches its normal operating parameters. Afterward, the test line is closed again using the valve to prevent any further extinguishing fluid from entering the line.

[0016] During a test run, there is a risk of a fire breaking out and triggering the water-based fire suppression system. In such a case, the available amount of extinguishing fluid pumped is reduced by the amount of water flowing through the open or unsealed test line. This intermittent condition currently prevents the labor-intensive weekly checks from being automated and increases the risk of the water-based fire suppression system being supplied with insufficient extinguishing fluid, for example, due to human error. In particular, the need to manually close the test line increases the risk that the sprinkler system operator will actually perform this task.

[0017] Against this background, an object of the present invention is to provide a solution that enables automated execution of the pump test run, thereby reducing the effort required to monitor the water extinguishing system. Furthermore, an object of the invention is to improve the reliability and efficiency of water extinguishing in a water extinguishing system of the type mentioned above. It is also an object of the invention to prevent the risk of an insufficient supply of extinguishing fluid to the water extinguishing system, particularly in the event of a fire during a pump test run.

[0018] This problem is solved according to the invention by a water extinguishing system of the type mentioned above, wherein the water extinguishing system comprises at least one control device configured to determine at least one parameter indicative of the cross-section of the fluid diversion and to control a pump test run based on this parameter. The present invention makes it possible to automate the pump test run. Thus, it is no longer sufficient to simply start the pump test run automatically, but rather the entire pump test run can proceed without manual intervention. This allows a pump test run to be carried out without the need for trained personnel on site.

[0019] Instead, a maintenance technician can send a signal to the pump's control unit, for example via a remote connection. This triggers the pump to start, as is already known from the prior art, for example, due to a pressure drop at the pump's inlet. According to the invention, the subsequent process can then be automated without requiring a trained person on site. This is because, according to the present invention, the extinguishing fluid pumped during the automatic pump test run is routed via the fluid diversion, thus eliminating the need to open or close the valve. Since the fluid diversion has a significantly reduced opening cross-section compared to the test line, typically at least 2%, only a very small portion of the extinguishing fluid is diverted from the pipe system and would therefore not be available for firefighting in the event of a fire.Since this only involves a small portion, efficient firefighting can still be carried out.

[0020] The present invention is therefore based on the finding that the small amount of extinguishing fluid that can be routed through the fluid diversion is sufficient to prevent the pump from running dry (and, for example, overheating) during the pump test run.

[0021] However, it must be ensured that the fluid diversion can actually carry a sufficient amount of extinguishing fluid. Due to its smaller cross-section compared to the test line, even minor deposits in the fluid diversion can prevent adequate flow of extinguishing fluid. Therefore, the pump test run must be controlled based on whether the fluid diversion can adequately divert the extinguishing fluid pumped during the test run away from the pipe system.

[0022] According to the invention, a new control device is provided that determines a parameter indicative of the cross-section of the fluid diversion and controls the pump test run based on this parameter. In particular, the control can be configured such that the parameter is used to determine—directly or indirectly—whether the cross-section of the fluid diversion is still large enough to supply sufficient extinguishing fluid to the pump. If this direct or indirect determination shows that sufficient extinguishing fluid can be supplied through the fluid diversion, the pump test run can continue. If the determination shows that the extinguishing fluid flow is insufficient, the control device can be configured to terminate the pump test run.

[0023] In the context of the invention, such a control device can be understood as any type of device that is quantitatively capable of controlling the pump test run of the pump based on the question of whether the cross-section of the fluid diversion is suitable and sufficient to ensure a sufficient flow of extinguishing fluid during the pump test run and thus prevent the pump from running dry.

[0024] In some embodiments, the control device can be designed, in particular, as a combination of a sensor and a control unit. The control unit of the control device can be arranged, in particular, on or in the immediate vicinity of the pump.

[0025] The control unit can be provided as a separate unit specifically designed to control the pump test run. In some embodiments, the control unit can also be implemented as an additional module for the automatic pump start (by lowering the pressure). Alternatively or additionally, according to the present invention, the control unit for the pump test run can also be integrated into a central device of the water extinguishing system and communicate bidirectionally with the pump via a communication unit.

[0026] Suitable sensors for the control unit are those that allow the determination of a parameter enabling conclusions to be drawn about the flow rate of the extinguishing fluid through the fluid diversion per unit of time, and thus about the cross-sectional area of ​​the fluid diversion. Such sensors can include, in particular, temperature sensors on the pump, especially at the pump outlet, since the temperature at the pump is indicative of the amount of extinguishing fluid that passes through the fluid diversion during the pump test run.

[0027] Alternatively or additionally, other sensors can be used to provide information about the pump's condition. For example, a vibration sensor and / or a noise sensor can be installed on the pump to measure its vibrations and / or noise output during operation. If cavitation or deposits occur in the fluid bypass, the pump's vibration and / or noise output will change. These changes, compared to the values ​​recorded during operation without cavitation or deposits, are also detected by the vibration and / or noise sensor and can therefore indicate a change in the pump's operating condition and suggest that the pump test run should be aborted.

[0028] Alternatively or additionally, the sensors can also include pressure sensors that detect a pressure difference, for example, between the first and second ends of the fluid diversion system, or temperature sensors that also measure temperature and / or temperature difference, for example, at the first and second ends of the fluid diversion system and / or at the pump inlet and outlet. Measuring the temperature and / or temperature difference within the fluid diversion system can thus, for example, allow the detection of potential freezing of the system, and a measurement at the pump can allow the detection of pump overheating.

[0029] The sensors can also include ultrasonic sensors capable of detecting deposits within the fluid diversion and thus a reduction in its cross-section. Alternatively or additionally, the sensors can include flow sensors configured to determine the flow rate per unit of time through the fluid diversion and / or the flow rate differential, for example, between a first end and a second end of the fluid diversion.

[0030] The use of additional sensors and / or a combination of the aforementioned sensors is conceivable and advantageous, as this enables a more precise determination of the state of the fluid diversion.

[0031] Depending on the type of sensor, it can be located directly on the fluid diversion and / or in the inlet or outlet lines of the fluid diversion and / or in the immediate vicinity, on and / or inside the pump.

[0032] In this case, one or more sensors of the control unit transmit the sensor data to the control unit, which enables the pump operation to be controlled. For this purpose, the control unit can evaluate the sensor data and thus determine the parameter that is indicative of the cross-section of the fluid diversion. The control can then be carried out depending on this parameter.

[0033] In some embodiments, the evaluation may include determining whether the flow rate per unit time / cross-sectional area of ​​the fluid diversion remains within a predefined range. If so, it can be assumed that the pump is adequately supplied with extinguishing fluid. If the flow rate per unit time / cross-sectional area falls below a predefined limit, it can no longer be assumed that the pump is capable of delivering sufficient extinguishing fluid. In this case, the control unit can output a signal that interrupts the pump test run and / or prevents it from starting in the first place. This prevents the pump from running dry during the test run.

[0034] Alternatively or additionally, the control device can also be designed as a switching device, in particular a flow switch, which switches at a specific flow rate (as a parameter indicative of the cross-section). If this flow rate falls below a certain threshold, the switching device switches from an activation position to a deactivation position. In the deactivation position, the pump is deactivated. For this purpose, the switching device can preferably be in the more energy-efficient state of the deactivation position and be shifted into the less energy-efficient state by the set flow rate. This ensures that the pump operation is interrupted in the event of a power failure.

[0035] However, it must be ensured that the pump is not deactivated by the switch in the event of a fire. This can be achieved, for example, by using a dual-wire system where, in the event of a fire, an additional switching device, such as a pressure switch within the pipe system, moves to an activation position and keeps the pump activated, even if the switching device for the pump test run moves to the deactivation position.

[0036] In some embodiments, the fluid diversion is arranged to branch off from the test line or from the supply line of the pipe system.

[0037] The fluid diversion is preferably configured to direct a portion of the extinguishing fluid away from the pipe system, bypassing the opening of the test line. In some embodiments, the fluid diversion branches off from the supply line to the pipe system. That is, the fluid diversion branches off at its first end, for example, from the distribution pipe downstream of the pump, thus diverting the extinguishing fluid pumped by the pump during the pump test run away from the pipe system. In some embodiments, the fluid diversion terminates at its second end in a drain. In some embodiments, the second end of the fluid diversion branches back into the fluid supply. Further configurations are possible, as long as they allow the extinguishing fluid pumped by the pump during the pump test run to be diverted away from the pipe system.

[0038] In some embodiments, the fluid diversion can also be configured such that its first end branches off from the test line—specifically, at a position upstream of the opening element—and its second end leads back into the test line—specifically, at a position downstream of the opening element. In this case, the extinguishing fluid carried by the fluid diversion is first routed through the test line, and the fluid diversion serves to guide the extinguishing fluid pumped during the pump test run around the (closed) opening element. The test line then carries the extinguishing fluid downstream of the opening element, for example, back into the fluid reservoir and / or into a drain, such as a wastewater network and / or a wastewater tank. In other embodiments, however, the second end of the fluid diversion may not lead into the test line, but rather separately from it back into the fluid reservoir and / or the drain.

[0039] In some embodiments, controlling the pump test run may involve comparing a parameter value with a predetermined limit value, and the control device may be configured to terminate the pump test run if the limit value is exceeded or fallen below, and / or not to start the pump test run.

[0040] As described above, the control device can in particular be configured to evaluate the parameter that is indicative of the cross-section and to control the pump test run based on this evaluation.

[0041] In some embodiments, the evaluation includes in particular determining a limit value for the parameter.

[0042] If the parameter is, for example, the flow rate of the extinguishing fluid per unit of time through the fluid diversion, a limit value, in particular a minimum value, can be set for this flow rate. If this minimum value is undershot, it can then be determined that the fluid diversion can no longer carry enough extinguishing fluid per unit of time to prevent the pump from running dry. In this case, the control unit is configured to abort any pump test run that is already in progress. Alternatively, if the pump test run has not yet started, the control unit is configured not to start the pump test run at all.

[0043] If the parameter is a pressure differential and / or pressure, a limit value can also be defined for this, in particular a minimum pressure value that must be guaranteed to prevent damage to the pump. If this value is undershot, the control unit will also terminate an ongoing pump test run or prevent the pump test run from starting at all, if it has not already begun.

[0044] If the parameter is temperature, particularly the temperature at the pump outlet, the limit value may include a maximum temperature for the extinguishing fluid that must not be exceeded. If this maximum value is exceeded, the control unit will then terminate an ongoing pump test run and / or prevent it from starting.

[0045] The limit values ​​used in the evaluation can be predetermined and may depend, in particular, on the pump used, its type, and / or its category. These specifications can be taken, for example, from the manufacturer's instructions. However, they can also be individually recalculated for each pump on a regular basis. The limit values ​​can be stored, in particular, in a memory unit of the control system and / or the central device.

[0046] In some embodiments, the control device may be configured to ensure an operational readiness state of the water extinguishing system in the event of a power failure during the pump test run.

[0047] The operating state refers to the state in which the water extinguishing system is in operation, i.e., used to carry out a fire protection action. The control unit can be configured to ensure this operational readiness state even in the event of a power failure, particularly a power outage. For this purpose, the control unit can include an energy storage device, such as a battery, which allows the pump to be activated even in the event of a power failure, thus, for example, interrupting the pump test run to conserve energy for a fire emergency.

[0048] In other embodiments where the control unit includes a switching device, this switching device can be configured to be in the deactivation position in the more energy-efficient state. In the event of a power failure, the switching device will therefore move to the deactivation position and thus abort the pump test run, ensuring the pump is in a ready-to-use state in case of a fire.

[0049] In some embodiments, the control device may be configured to ensure an operating state of the water extinguishing system in the event of a fire during the pump test run.

[0050] In this context, an operating state is understood to be the state into which the water extinguishing system transitions in the event of a fire, i.e., in which the water extinguishing system is triggered and carries out fire suppression.

[0051] When automating the pump test run, it must be ensured that the pump does not switch off after the test run is completed in the event of a fire, but continues to run to supply the water extinguishing system with extinguishing fluid. Therefore, the control unit must be configured to prevent the pump from being switched off / deactivated after the test run is complete if a fire occurs.

[0052] For this purpose, the control unit is preferably in signal communication with a detection device, such as an alarm valve or a check valve, connected to a flow sensor of the water extinguishing system, which is designed to detect a fire. If this detection device detects a fire, the control unit receives a signal indicating that the pump should continue running even after the pump test run is complete. The control unit then controls the pump in such a way that the pump operation is not interrupted after the test run is finished.

[0053] If the control device is designed as a switching arrangement, such a provision of an operating state in the event of a fire can be achieved, in particular, by appropriately wiring the pump. In this case, the pump is switched by at least two switching arrangements, one of which is configured to activate and deactivate the pump for the pump test run, and a second switching arrangement, which includes, for example, an alarm switch and / or a pressure switch, is configured to activate the pump in the event of a fire. If a fire occurs during the pump test run, the first switching arrangement can deactivate the pump test run, but the second switching arrangement ensures that the pump remains activated and delivers the extinguishing fluid for the water extinguishing system to extinguish the fire.

[0054] This ensures that operational readiness is maintained in the event of a fire, even during an automatic pump test run.

[0055] In some embodiments, the water extinguishing system may further include an input device that is configured to receive an automated input which causes the pump to start a pump test run.

[0056] As described at the beginning, the water extinguishing system can include, in particular, a pump with a control unit configured for so-called automatic pump start. This automatic pump start means that the pump test run can be started automatically, especially by entering a corresponding command via an input device.

[0057] The advantage of this design is that the pump test run can also be started via a remote connection, meaning no on-site maintenance personnel are required. This eliminates the need for maintenance personnel to travel to and from the site for weekly checks, thus avoiding the associated costs. Furthermore, more pump test runs can be performed, as a single person can conduct several tests simultaneously and collect the corresponding data.

[0058] In some embodiments, the control device may include at least one flow sensor, where the parameter can specify a flow rate of the extinguishing fluid per unit of time through the fluid diversion.

[0059] In some embodiments, the control device is designed as a combination of a control unit and a flow sensor, and accordingly includes such a flow sensor. The flow sensor is preferably arranged on the fluid bypass to measure the flow rate of the extinguishing fluid per unit of time. Due to the small cross-section of the fluid bypass, a flow sensor capable of measuring with very high accuracy is preferred, so that irregular deviations can be detected even in the case of small flow rates. Such a flow sensor can, for example, comprise an electronic flow meter, such as a variable area flow meter. Flow sensors comprising impellers, dynamic pressure sensors, ultrasonic sensors, gyroscopic flow meters, and thermal sensors, which, for example, detect heating due to cavitation within the fluid bypass, are also preferred.

[0060] In some embodiments, the control device may include at least one pressure sensor, where the parameter may specify a differential pressure of the extinguishing fluid through the fluid diversion.

[0061] Alternatively or additionally, in some embodiments, the control device may also include one or more pressure sensors configured to determine the differential pressure of the extinguishing fluid through the fluid diversion. For this purpose, the pressure sensor may preferably be designed as a differential pressure sensor, configured to measure the pressure at at least two positions along the fluid diversion in order to determine the differential pressure. To this end, the at least one pressure sensor for determining the differential pressure may preferably comprise several pressure gauges, each of which detects and transmits the pressure value at its respective positions.

[0062] Alternatively or additionally, several independent pressure sensors can be used, each capable of measuring the pressure at a specific location along the fluid diversion. In this case, the measurements from the multiple pressure sensors are combined to determine a differential pressure. In some embodiments, a first pressure reading can be taken at a first end of the fluid diversion, and a second pressure reading can be taken at a second end of the fluid diversion to determine the pressure drop along the fluid diversion. Alternatively or additionally, pressure sensors can also be arranged at branches from the sampling line to the fluid diversion, allowing the differential pressure at the sampling line inlets to be determined. In some embodiments, more than two pressure readings can be taken. This can increase the accuracy of the pressure drop determination.

[0063] When determining pressure values, the necessary accuracy must be ensured, as the very small cross-section of the fluid diversion means that pressure changes or losses along the line can be subject to very small deviations, which can nevertheless have very significant consequences for the pump test run. These values ​​can be in the range of a few millibars, so the corresponding accuracy must be guaranteed. One way to achieve the necessary accuracy would be to equip a pressure sensor with an orifice plate.

[0064] In this way, the pressure loss along the entire fluid bypass can be determined, allowing conclusions to be drawn about the cross-section of the fluid bypass. For example, a high pressure loss indicates that the cross-section is insufficient, particularly if it is too small. If this is detected, for example by comparing the value of the parameter representing the pressure difference with a corresponding limit value, the control unit instructs the pump to abort the pump test run or not to start it at all.

[0065] In some embodiments, the control device may include at least one noise sensor, wherein the parameter specifies a noise output of the pump that is indicative of a pump state. In some embodiments, the control device may include at least one vibration sensor, wherein the parameter specifies a vibration state of the pump that is indicative of the pump state.

[0066] In some embodiments, the control device can also include a noise sensor, preferably arranged to detect the pump's noise output. This embodiment is based on the understanding that the pump's noise output changes depending on the extent of cavitation / deposits within the fluid line that carries the extinguishing fluid. In particular, the pump's noise output is indicative of the pump's condition. This means that changes in the pump's condition can be detected by measuring its noise output. If the pump can no longer deliver sufficient extinguishing fluid due to cavitation in the fluid bypass, the noise output changes, specifically the noise level and frequency. Measuring this change allows the system to determine when the pump must be switched off to prevent it from running dry.

[0067] Alternatively or additionally, the pump's vibration can be measured using a vibration sensor to determine the occurrence of cavitation / deposits within the fluid bypass system and to shut down the pump if excessive deposits occur that could cause it to run dry. This is because the pump's vibrations also change when the amount of extinguishing fluid pumped per unit of time changes. If less extinguishing fluid can be pumped due to cavitation, this leads to a corresponding change in the pump's vibration spectrum compared to the values ​​recorded by the vibration sensor in the initial state (i.e., without cavitation). This allows conclusions to be drawn about the pump's condition and thus a decision to be made as to whether a pump test run should be aborted to prevent damage to the pump.

[0068] In some embodiments, the control device may include a switching arrangement configured to switch between an activation position and a deactivation position, wherein the deactivation position represents the more energy-efficient state and is switched when a limit value for a flow rate is undershot, and wherein the pump operation is terminated in the deactivation position.

[0069] In some embodiments, the control device can additionally or alternatively control the pump test run quantitatively. For this purpose, the control device can, in particular, include or be configured as a switching arrangement. This means that instead of a control unit and a sensor, the switching arrangement is used. This switching arrangement can, in particular, be in the form of a flow switch located within the fluid bypass and capable of switching between an activation position and a deactivation position. This flow switch is preferably configured such that, upon exceeding a certain flow rate, it switches from the deactivation position to the activation position, thereby controlling the pump test run.

[0070] Specifically, this means that a pressure drop is initially registered, for example via a pressure switch at the inlet of the pump under test, which triggers the pump to start. The pump then begins to deliver extinguishing fluid. This increases the flow rate through the fluid bypass, causing the switching arrangement in the control unit to change from the deactivation to the activation position. In the activation position, a signal is then output that controls the pump test run. However, if the cross-section of the fluid bypass is reduced to such an extent, for example due to cavitation or deposits, that a sufficient flow rate of extinguishing fluid can no longer be achieved, the switching arrangement in the control unit does not change from the deactivation to the activation position, and the pump test run is not started.This ensures that the pump test run is only carried out when there is a sufficient flow rate per unit of time through the fluid diversion (and thus a sufficient cross-section of the fluid diversion).

[0071] If the flow rate decreases during a pump test run, for example due to a blockage or similar issue in the fluid bypass, the switching mechanism is also triggered, changing from the activation to the deactivation position and aborting the pump test run. This prevents damage to the pump.

[0072] The pump test run ends when the pump reaches its normal operating parameters. At this point, the pressure at the pump inlet returns to normal, the pressure switch used for automatic pump start returns to its initial position, and the pump is deactivated. This reduces the flow rate per unit of time due to the fluid diversion, causing the control unit's switching mechanism to move to the deactivation position. This (finally) ends the pump test run.

[0073] If a fire occurs during the pump test run, the pressure at the pump inlet remains low, the pressure switch at the pump inlet does not activate, and the pump continues to deliver extinguishing fluid. This also ensures a constant flow rate per unit of time through the fluid diversion, thus keeping the switching mechanism in the activated position. In this way, the control unit ensures that the water extinguishing system switches to operational mode in the event of a fire, even if the pump test run is ongoing. Since the fluid diversion only removes a very small portion of the extinguishing fluid – just enough to prevent damage to the pump during the test run – efficient fire suppression is ensured despite this slight reduction in the extinguishing fluid volume.

[0074] In some embodiments, the water extinguishing system may further include at least one temperature sensor, which may be arranged in the vicinity of the pump and configured to determine the temperature of the extinguishing fluid. Control, based on this parameter, involves comparing a temperature value of the extinguishing fluid in the vicinity of the pump with a temperature limit. In some embodiments, the control device may be configured to terminate the pump test run if the temperature limit is exceeded.

[0075] In some embodiments, the water extinguishing system further includes a temperature sensor, which, together with the control unit, can form the control device. This temperature sensor is preferably arranged in the immediate vicinity of the pump. "In the immediate vicinity" refers to the area around the pump and the area within the pump. In particular, "in the immediate vicinity" refers to the area at the pump inlet and / or the pump outlet. In some embodiments, the temperature sensor is specifically arranged at the pump outlet and configured to directly measure the temperature of the pump or to determine it indirectly by measuring the temperature of the extinguishing fluid pumped by and exiting the pump.

[0076] The temperature value determined in this way can then be compared with a corresponding limit value for evaluation. This limit value can, in particular, be a maximum temperature for the pump and / or the extinguishing fluid pumped by the pump, i.e., a corresponding temperature limit. If this maximum value is exceeded, it can be assumed that the pump would overheat if the test run continued. Therefore, the control unit is preferably configured to abort the pump test run in such a case. If an exceedance of the temperature limit value is detected before the pump starts, the control unit is configured not to start the pump test run at all.

[0077] In some embodiments, the temperature sensor could also be located inside the pump and measure the pump temperature from there. In this case, too, control could be based on a temperature limit comparison. In any case, the temperature limit must be selected depending on the specific pump and / or pump type and / or extinguishing fluid, depending on the temperature being measured and at which location it is measured.

[0078] One advantage of this design is that the evaluation of whether the pump test run should be started / continued is carried out directly by observing the pump or the pump area. This can potentially lead to a better assessment of the pump's condition.

[0079] In some embodiments, the cross-section of the fluid diversion branching off from the test line can be reduced by more than 90%, preferably more than 95%, and even more preferably more than 98%, compared to the test line. This means that the fluid diversion has a cross-section of approximately 10% or less, preferably less than 5%, and even more preferably approximately 2% or less than the test line. In conventional water-based fire suppression systems, the fluid diversion will have a cross-section of approximately 2% of the test line.

[0080] In another aspect, the invention relates to a control device for use in a water extinguishing system according to at least one of the embodiments described above, wherein the control device is configured to determine at least one parameter that is indicative of a cross-section of a fluid diversion, and to control a pump test run of the pump on the basis of the parameter.

[0081] In a further aspect, the invention relates to a method for controlling a pump test run, particularly in a water extinguishing system according to one of the embodiments described above, wherein the method comprises the following steps: providing a fluid diversion having a reduced cross-section compared to a test line branching off from a supply line of the pipe system, wherein the fluid diversion is configured to direct a predefined proportion of the extinguishing fluid away from the pipe system around an opening of the test line; determining at least one parameter indicative of the cross-section of the fluid diversion; and controlling the pump test run of the pump based on this parameter. In some embodiments, the method may also include: arranging a temperature sensor in the vicinity of the pump; and determining the parameter indicative of a temperature of the extinguishing fluid in the vicinity of the pump.

[0082] In a further aspect, the invention relates to the use of a fluid diversion in a water extinguishing system, in particular a water extinguishing system according to one of the embodiments described above, for a pump test run, wherein the fluid diversion has a reduced cross-section compared to a test line branching off from a supply line of the water extinguishing system and comprising an opening element which is arranged to be movable between a locking position in which the opening element closes the test line and an unlocking position in which the opening element opens the test line, and is arranged to divert a predefined proportion of the extinguishing fluid around the opening element away from a pipe system of the water extinguishing system.

[0083] Although the preferred embodiments of the invention have been explained above in connection with the aspect of the water extinguishing system, these preferred embodiments are equally also preferred embodiments of the other aspects mentioned above.

[0084] The invention is described in more detail below with reference to the accompanying figures and preferred embodiments. These figures show: Fig. 1 shows a schematic diagram of a water extinguishing system according to a preferred embodiment. Fig. 2 shows a schematic diagram of a water extinguishing system according to a further preferred embodiment. Fig. 3 shows a schematic diagram of a water extinguishing system according to yet another preferred embodiment. Fig. 4 shows a schematic diagram of a water extinguishing system according to yet another embodiment. Fig. 5 shows a schematic diagram of a water extinguishing system according to yet another embodiment.

[0085] The Fig. 1 Figure 1 shows a water extinguishing system 1 according to a preferred embodiment of the invention. In this embodiment, the water extinguishing system 1 is a sprinkler system comprising a plurality of sprinklers 501, which are supplied with an extinguishing fluid via a pipe system 500.

[0086] The extinguishing fluid is supplied by a fluid supply system, which in the exemplary design of the Fig. 1 The fluid supply tank 10 is designed as a fluid supply container. The fluid supply container 10 is connected to the pipe system 500 via a supply line 2 in order to supply the pipe system 500 with extinguishing fluid.

[0087] The supply line 2 is preferably designed as a pipe in which a shut-off valve 101, a pressure gauge 102, a pump 20, a backflow preventer 50, and a shut-off valve 51 are arranged. The pump 20 serves to pump the extinguishing fluid from the fluid supply tank 10. The pump 20 is designed as a sprinkler pump.

[0088] A test line 3 branches off from the supply line 2 and includes a shut-off device 31. According to the prior art, this test line 3 was used to perform a pump test run, for which purpose the opening device 31 was moved from a closed position to an unlocked position to open a test circuit. However, it should be understood here that such an opening of the test line 3 is no longer necessary for performing the pump test run according to the invention.

[0089] The trial line 3 according to the Fig. 1 is designed to direct the extinguishing fluid pumped by pump 20 into a fluid reservoir 11. In the specific embodiment of the Fig. 1 This fluid reservoir is connected to the fluid supply container 10 via fluid communication, so that the extinguishing fluid is returned to the fluid supply. In other embodiments, however, the test line 3 can also be designed such that the extinguishing fluid flowing through it is lost from the extinguishing circuit by being directed into a drain.

[0090] In the locked position of the opening element 31, the opening element 31 is positioned such that no fluid flow can occur through the test line 3. However, a fluid diversion 4 branches off from the test line 3, which in the embodiment of the Fig. 1 The fluid diversion 4 has a cross-section reduced by 98% compared to the test line 3, i.e., it has only about 2% of the cross-section of the test line 3. This fluid diversion 4 allows a small portion of the extinguishing fluid to flow around the opening element and thus enter the fluid reservoir 11.

[0091] In the specific embodiment of the Fig. 1 The fluid diversion 4 branches off from the test line 3. In other embodiments, however, the fluid diversion can alternatively or additionally branch off from the supply line 2, as long as it allows a portion of the extinguishing fluid to be diverted around the opening element when the extinguishing fluid is pumped by the pump 20.

[0092] The water extinguishing system 1 according to the Fig. 1 It also includes a pump control 21 with a pressure switch 22. The pump control 21 is used to start the pump 20. If a pump test run is to be carried out, this is done in the Fig. 1 The process is initiated by a decrease in the pressure perceived by pressure switch 22. This pressure drop causes pressure switch 22 to switch, thereby activating pump control 21 and thus pump 20. Pump 20 then begins to operate and pump extinguishing fluid. Since the shut-off valve 51 to the pipe system is closed, the extinguishing fluid is routed through test line 3, from where it is directed via fluid diversion 4.

[0093] In the specific embodiment of the Fig. 1 The pump control 21 comprises a module which includes the control unit 211. The control unit 211 is in communicative signal connection with the flow sensor 41, which is arranged on the sampling line 3. In the specific embodiment of the Fig. 1 Flow sensor 41 and control unit 211 form the control device for controlling the pump test run.

[0094] The flow sensor 41 is configured to determine the flow rate per unit of time of the extinguishing fluid pumped by the pump 20 and thus to determine a parameter that is indicative of the cross-section of the fluid diversion 4. The value of this parameter is then evaluated by the control unit 211. Based on this evaluation, the control unit 211 controls the pump test run of the pump 20. In particular, the control unit determines whether the pump test run should be aborted because of malfunctions that could damage the pump, or whether the pump test run should not be started at all because of such malfunctions, or whether the pump test run can be carried out as planned. In the latter case, after successful completion of the pump test run – i.e., after the operating parameters of the pump 20 have been reached – the control unit deactivates the pump 20.

[0095] In the embodiment of the Fig. 1 The pump test run is controlled by a control device comprising a control unit 211 and a flow sensor, where the parameter indicative of the cross-section of the fluid diversion 4 is a flow parameter. The extinguishing fluid pumped by the pump 20 during the pump test run is diverted via the fluid diversion 4, thus preventing damage to the pump. The pump test run according to the invention is therefore carried out using the fluid diversion 4. This means that the fluid diversion 4, rather than the test line 3, is used to divert the extinguishing fluid away from the pump during the pump test run. Since the fluid diversion 4, unlike the test line, always carries extinguishing fluid, the pump test run can also be carried out without opening a corresponding opening device.Furthermore, since the amount of extinguishing fluid routed through fluid diversion 4 is very small in relation to the total amount of extinguishing fluid, performing the pump test run does not negatively affect the supply of extinguishing fluid to the water-based extinguishing system. Therefore, the risk of an insufficient supply of extinguishing fluid to the water-based extinguishing system does not exist in this case.

[0096] The water extinguishing system 1 of the Fig. 1 This enables an automatic pump test run, ensuring that even in the event of a fire or power failure, the water extinguishing system 1 has enough extinguishing fluid available for firefighting, and that the pump 20 is controlled in such a way that it remains active in the event of a fire, even after the pump test run has been completed.

[0097] The Fig. 1 Figure 1 shows a water extinguishing system 1 according to a preferred embodiment of the invention. In this embodiment, the water extinguishing system 1 is a sprinkler system comprising a plurality of sprinklers 501, which are supplied with an extinguishing fluid via a pipe system 500.

[0098] The extinguishing fluid is supplied by a fluid supply system, which in the exemplary design of the Fig. 1 The fluid supply tank 10 is designed as a fluid supply container. The fluid supply container 10 is connected to the pipe system 500 via a supply line 2 in order to supply the pipe system 500 with extinguishing fluid.

[0099] The supply line 2 is preferably designed as a pipe in which a shut-off valve 101, a pressure gauge 102, a pump 20, a backflow preventer 50, and a shut-off valve 51 are arranged. The pump 20 serves to pump the extinguishing fluid from the fluid supply tank 10. The pump 20 is designed as a sprinkler pump.

[0100] A test line 3 branches off from the supply line 2 and includes a shut-off device 31. According to the prior art, this test line 3 was used to carry out a pump test run, for this purpose the opening device 31 is moved from a closed position to an unlocked position in order to open a test circuit.

[0101] The trial line 3 according to the Fig. 1 is designed to direct the extinguishing fluid pumped by pump 20 into a fluid reservoir 11. In the specific embodiment of the Fig. 1 This fluid reservoir is connected to the fluid supply container 10 via fluid communication, so that the extinguishing fluid is returned to the fluid supply. In other embodiments, however, the test line 3 can also be designed such that the extinguishing fluid flowing through it is lost from the extinguishing circuit by being directed into a drain.

[0102] In the locked position of the opening element 31, the opening element 31 is positioned such that no fluid flow can occur through the test line 3. However, a fluid diversion 4 branches off from the test line 3, which in the embodiment of the Fig. 1 The test line 3 has a cross-section reduced by 98%. This fluid diversion 4 allows a small portion of the extinguishing fluid to flow around the opening element and thus into the fluid reservoir 11.

[0103] In the specific embodiment of the Fig. 1 The fluid diversion 4 branches off from the test line 3. In other embodiments, however, the fluid diversion can alternatively or additionally branch off from the supply line 2, as long as it allows a portion of the extinguishing fluid to be diverted around the opening element when the extinguishing fluid is pumped by the pump 20.

[0104] The water extinguishing system 1 according to the Fig. 1 It also includes a pump control 21 with a pressure switch 22. The pump control 21 is used to start the pump 20. If a pump test run is to be carried out, this is done in the Fig. 1 The process is initiated by a decrease in the pressure perceived by pressure switch 22. This pressure drop causes pressure switch 22 to switch, thereby activating pump control 21 and thus pump 20. Pump 20 then begins to operate and pump extinguishing fluid. Since the shut-off valve 51 to the pipe system is closed, the extinguishing fluid is routed through test line 3, from where it is directed via fluid diversion 4.

[0105] In the specific embodiment of the Fig. 1 The pump control 21 comprises a module which includes the control unit 211. The control unit 211 is in communicative signal connection with the flow sensor 41, which is arranged on the sampling line 3. In the specific embodiment of the Fig. 1 Flow sensor 41 and control unit 211 form the control device for controlling the pump test run.

[0106] The flow sensor 41 is configured to determine the flow rate per unit of time of the extinguishing fluid pumped by the pump 20 and thus to determine a parameter that is indicative of the cross-section of the fluid diversion 4. The value of this parameter is then evaluated by the control unit 211. Based on this evaluation, the control unit 211 controls the pump test run of the pump 20. In particular, the control unit determines whether the pump test run should be aborted because of malfunctions that could damage the pump, or whether the pump test run should not be started at all because of such malfunctions, or whether the pump test run can be carried out as planned. In the latter case, after successful completion of the pump test run – i.e., after the operating parameters of the pump 20 have been reached – the control unit deactivates the pump 20.

[0107] In the embodiment of the Fig. 1 The pump test run is controlled by a control device comprising a control unit 211 and a flow sensor, where the parameter indicative of the cross-section of the fluid diversion 4 is a flow parameter. The extinguishing fluid pumped by the pump 20 during the pump test run is diverted via the fluid diversion 4, thus preventing damage to the pump.

[0108] The water extinguishing system 1 of the Fig. 1 This enables an automatic pump test run, ensuring that even in the event of a fire or power failure, the water extinguishing system 1 has enough extinguishing fluid available for firefighting, and that the pump 20 is controlled in such a way that it remains active in the event of a fire, even after the pump test run has been completed.

[0109] The Fig. 2 Figure 1 shows a water extinguishing system 1' according to a further preferred embodiment of the invention. The embodiment of Fig. 2 is in many respects parallel to the embodiment of the Fig. 1 executed, wherein identical components are designated with the same reference numerals. The water extinguishing system 1' also comprises a fluid supply tank 10, a fluid reservoir 11, a supply line 2 to a pipe system 500 with a shut-off valve 101, a pressure gauge 102, a pump 20, a backflow preventer 50 and a second shut-off valve 51. Also in the embodiment of the Fig. 2 The pump 20 is controlled by the pump control 21, comprising the control unit 211 and connected to the pressure switch 22. The functionalities of these elements correspond to those of the embodiment of the Fig. 1 , which is why a more detailed description is omitted here.

[0110] The water extinguishing system 1' of the Fig. 2 is set up for an automatic pump test run, which, as in connection with the Fig. 1 described, which is started by the pump control 21 by means of the pressure switch 22. Also in the embodiment of the Fig. 2 The water extinguishing system 1' comprises a test line 3 with an opening device 31 and a fluid diversion 4. However, in the embodiment of the Fig. 2 No flow sensor 41 is arranged on the test line. Instead, the water extinguishing system 1' includes a differential pressure sensor 42, which is configured to determine a first pressure value at a first position 43 at a first end of the fluid diversion 4, more precisely at a branch of the fluid diversion 4 from the test line 3, and to determine a second pressure value at a second position 44 at a second end of the fluid diversion 4, more precisely at the branch of the fluid diversion 4 to the test line 3. The differential pressure sensor 42 thus allows the pressure difference between a position at the beginning of the fluid diversion 4 and a position at the end of the fluid diversion 4 to be determined. This enables the measurement of a pressure loss of the extinguishing fluid along the fluid diversion 4. This, in turn, allows conclusions to be drawn about the properties of the cross-sectional area of ​​the fluid diversion 4.

[0111] The pressure difference is transmitted by the pressure differential sensor 42 to the control unit 211 in the pump control unit 21. The control unit 211 evaluates the measured pressure difference and thus determines whether the cross-section of the fluid diversion is sufficient to reliably divert the extinguishing fluid pumped by the pump 20 during the pump test run away from this pump and thus prevent damage to the pump 20.

[0112] For this purpose, the control unit 211 is preferably configured to compare the pressure difference value with a previously defined limit value. This limit value can, in particular, specify a maximum value for the pressure difference. If the pressure difference value exceeds this maximum value, this indicates that the cross-section of the fluid bypass 4 is insufficient to prevent damage to the pump.

[0113] If this evaluation indicates that this is the case, control unit 211 is configured to output a signal that terminates the pump test run. If the pump test run has not yet started, this signal can also prevent the pump from starting at all.

[0114] However, if the evaluation shows that the maximum value remains below the set point, the pump test run can be carried out until the operating parameters of pump 20 are reached and is then terminated normally by the control unit 211 of the control device.

[0115] Fig. 3 Figure 1 shows a water extinguishing system 1" according to a further preferred embodiment. Here too, identical elements are again provided with the same reference numerals. This means that the water extinguishing system 1" also comprises a fluid supply tank 10, a fluid reservoir 11, a supply line 2 to a pipe system 500 with a first shut-off valve 101, a pressure gauge 102, a pump 20, a non-return valve 50, and a second shut-off valve 51. This also applies to the embodiment of Fig. 3 The pump 20 is controlled by the pump control 21 comprising the control unit 211 and connected to the pressure switch 22.

[0116] In contrast to the embodiments of the Fig. 1 and 2 is in the water extinguishing system 1" of the Fig. 3 However, no measurement of the pressure or flow rate was performed at the test line 3 or the fluid diversion 4. Instead, the water extinguishing system 1" includes a temperature sensor 23, which is in communicative signal connection with the control unit 211 and together with it forms the control device for controlling the pump test run.

[0117] The temperature sensor 23 is arranged at an outlet of the pump 20 and configured to determine the temperature of the extinguishing fluid pumped by the pump 20. This allows the temperature of the pump 20 to be determined indirectly, and thus whether the flow rate of the extinguishing fluid pumped by the pump 20 is sufficient to protect it from running dry and / or overheating – and therefore from damage. Although in the specific embodiment of the Fig. 3 Where a temperature sensor 23 is used to detect any damage to the pump 20, it should be understood that alternatively or additionally, a noise sensor and / or a vibration sensor can also be used to monitor the condition of the pump. Such a noise sensor and / or a vibration sensor would also be arranged similarly to the temperature sensor. Preferably, the arrangement of a noise sensor and / or vibration sensor can also be made directly on the pump housing.

[0118] The measured temperature is transmitted to control unit 211. Control unit 211 is configured to compare the temperature with a temperature limit. If this temperature limit is exceeded, it means that the extinguishing fluid—and therefore also pump 20—has become too hot. In this case, control unit 211 outputs a signal that either terminates an already started pump test run or prevents a pump test run from starting. However, if the temperature remains below the temperature limit, control unit 211 allows the pump test run to continue until the pump's operating parameters are reached and only then outputs a signal to terminate the pump test run.

[0119] Fig. 4 Figure 1 shows a water extinguishing system 1‴ according to a further preferred embodiment, comprising a supply line 2, a test line 3, a fluid diversion 4, a pump 20, a pipe system 500, a fluid supply tank 10, and a fluid reservoir 11, as described above. Identical elements are again designated with the same reference numerals. That is, in the water extinguishing system 1‴, a first shut-off valve 101, a pressure gauge 102, a backflow preventer 50, and a second shut-off valve 51 are also arranged along the supply line 2, and the pump 20 is activated by a pump controller 21 with a pressure switch 22.

[0120] In contrast to the previous embodiments, in the embodiment of the Fig. 4 However, the control device is no longer designed as a combination of a control unit 211 and a sensor, but as a switching arrangement 212, which is arranged on the fluid diversion 4 and includes a flow switch that is configured to switch from a deactivation position to an activation position at a certain flow rate of the extinguishing fluid through the fluid diversion 4. If the pump is now activated via the pump control 21 by means of the pressure switch, as in connection with the Fig. 1 As described, once started, the extinguishing fluid flows through the fluid diversion 4 at a specific rate per unit of time. The pressure switch in the switching arrangement 212 is configured to switch to the activation position when a specific extinguishing fluid flow rate per unit of time is exceeded. In the activation position, the switching arrangement 212 causes the pump test run of pump 20 to continue.

[0121] However, if the flow rate per unit of time is too low, for example due to cavities and / or deposits in the fluid diversion 4, the switching arrangement 212 either does not switch to the activation position at all or switches back to the deactivation position, so that the pump test run of pump 20 is either not started at all or is aborted. In this way, the switching arrangement 212 prevents damage to the pump due to an insufficient extinguishing fluid line.

[0122] If the flow rate of the extinguishing fluid per unit of time is sufficient for the entire pump test run, the switching arrangement 212 does not switch. In this case, the pump 20 can reach its operating parameters and the pump test run ends normally. The pump 20 then switches off, and the flow rate per unit of time through the fluid diversion 4 decreases. This triggers the switching arrangement 212; the flow switch changes from the activation position to the deactivation position and thus also sends a deactivation signal for the pump test run.

[0123] However, if a fire occurs during the pump test run, the flow rate per unit of time is not reduced by the continuously open fluid diverter 4 as long as extinguishing fluid is still available – the pump 20 continues to operate. In this case, the flow switch of the switching arrangement 212 remains in the activated position. This ensures that the pump is not switched off after the (presumed) completion of the pump test run, but continues to pump extinguishing fluid to fight the fire. This arrangement thus ensures operational readiness in the event of a fire.

[0124] The Fig. 5 Figure 1 shows a water extinguishing system 1ʺʺ according to a further preferred embodiment. The water extinguishing system 1ʺʺ corresponds in its arrangement with respect to the sensors and its operation to the water extinguishing system 1‴ of Figure 1. Fig. 4 with the difference that the fluid diversion 4 in the water extinguishing system 1ʺʺ of the Fig. 5 branching off from supply line 2 to divert the extinguishing fluid around the shut-off device 31 of the test line 3 away from the pipe system 500. This modified arrangement of the fluid diversion 4 has no effect on the above in connection with the Fig. 4 described pump test run. It should be understood here that this also applies to the water extinguishing systems 1, 1' and 1" of the Figuren 1 , 2 and 3 with a design of the fluid diversion 4 according to the Fig. 5 can be equipped without affecting the general functioning of the water extinguishing systems 1, 1' and 1" and the corresponding pump test runs.

[0125] A combination of the sensor arrangements and / or configurations of the fluid diversion 4 and / or the sampling line 3 according to the exemplary embodiments of the Figuren 1 bis 5 This is conceivable. For example, a combination of a temperature sensor in the vicinity of pump 20 with a differential pressure sensor on the fluid bypass 4 can be used to ensure improved monitoring of the pump test run. This combination can further be combined with a flow sensor on the fluid bypass 4 and / or a vibration sensor on pump 20 and / or a noise sensor on or in the vicinity of pump 20 to further improve monitoring. Other combinations, which will be immediately apparent to a person skilled in the art after studying the above description, are also provided for within the scope of the invention. Liste der Bezugszeichen:

[0126] 1, 1', 1", 1‴, 1ʺʺ Water extinguishing system 10 Fluid supply tank 11 Fluid reservoir 101 First shut-off valve 102 Pressure gauge 2 Supply line 20 Pump 21 Pump control 22 Pressure switch for pump control 23 Temperature sensor 211 Control unit 212 Switching arrangement 3 Test line 31 Opening device 4 Fluid diversion 41 Flow sensor 42 Differential pressure sensor 43 First position 44 Second position 50 Backflow preventer 51 Second shut-off valve 500 Piping system 501 Sprinkler

Claims

1. A water extinguishing system (1) comprising: a fluid supply (10) for providing an extinguishing fluid; a pump (20) which is configured to pump the extinguishing fluid from the fluid supply (10) into a supply line (2) of a pipe system (500) of the water extinguishing system (1), a test line (3) which branches off from the supply line (2) of the pipe system (500) and is configured to conduct the extinguishing fluid pumped by the pump (20) away from the pipe system (500), wherein the test line (3) has an opening element (31), which is configured to be movable between a locking position, in which the opening element (31) closes the test line (3), and an unlocking position, in which the opening element (31) opens the test line (3), and a fluid bypass line (4) which in comparison with the test line (3) has a reduced cross-section and is configured to conduct a predefined portion of the extinguishing fluid around the opening element (31) away from the pipe system (500), characterized in that the water extinguishing system further comprises: at least one control device (21, 211, 212, 23, 41, 42) which is configured to determine at least one parameter indicative of the cross-section of the fluid bypass line (4) and to control a pump test run of the pump (20) on the basis of the parameter.

2. The water extinguishing system (1) according to claim 1, wherein the fluid bypass line (4) is configured to branch off from the test line (3) or from the supply line (2) of the pipe system (500).

3. The water extinguishing system (1) according to at least one of the preceding claims, wherein controlling the pump test run comprises comparing a parameter value with a predetermined threshold value, wherein the control device (21, 211, 212, 23, 41, 42) is configured to terminate the pump test run and / or to not start the pump test run if the threshold value is exceeded or not reached.

4. The water extinguishing system (1) according to at least one of the preceding claims, wherein the control device (21, 211, 212, 23, 41, 42) is configured to ensure a state of operational readiness of the water extinguishing system (1) in the event of an energy failure during the pump test run.

5. The water extinguishing system (1) according to at least one of the preceding claims, wherein the control device (21, 211, 212, 23, 41, 42) is configured to ensure an operating state of the water extinguishing system (1) in the event of fire during the pump test run.

6. The water extinguishing system (1) according to at least one of the preceding claims, further comprising an input device configured to receive an automated input causing the pump (20) to start a pump test run.

7. The water extinguishing system (1) according to at least one of the preceding claims, wherein the control device (21, 211, 212, 23, 41, 42) comprises at least one flow sensor (41, 45), and wherein the parameter indicates a flow volume of the extinguishing fluid per unit of time through the fluid bypass line (4).

8. The water extinguishing system (1) according to at least one of the preceding claims, wherein the control device (21, 211, 212, 23, 41, 42) comprises at least one pressure sensor (42), and wherein the parameter indicates a differential pressure of the extinguishing fluid through the fluid bypass line (4).

9. The water extinguishing system (1) according to at least one of the preceding claims, wherein the control device (21, 211, 212, 23, 41, 42) comprises at least one noise sensor, and wherein the parameter indicates a noise output of the pump (20) indicative of a state of the pump (20).

10. The water extinguishing system (1) according to at least one of the preceding claims, wherein the control device (21, 211, 212, 23, 41, 42) comprises at least one vibration sensor, and wherein the parameter indicates a vibration state of the pump (20) indicative of a state of the pump (20).

11. The water extinguishing system (1) according to at least one of the preceding claims, wherein the control device (21, 211, 212, 23, 41, 42) comprises a switching arrangement which is configured to switch between an activation position and a deactivation position, wherein the deactivation position represents the energetically more favorable state and is switched when a flow rate falls below a threshold value, and wherein the pump operation is terminated in the deactivation position.

12. The water extinguishing system (1) according to at least one of the preceding claims, further comprising a temperature sensor (23) arranged in the vicinity of the pump (20) and configured to determine a temperature of the extinguishing fluid, wherein controlling, based on the parameter, comprises comparing a temperature value of the temperature of the extinguishing fluid in the vicinity of the pump (20) with a temperature threshold value.

13. The water extinguishing system (1) according to claim 12, wherein the control device (21, 211, 212, 23, 41, 42) is configured to terminate the pump test run if the temperature threshold value is exceeded.

14. The water extinguishing system (1) according to at least one of the preceding claims, wherein the cross-section of the fluid bypass line (4) is reduced by a value of more than 90%, preferably more than 95%, even more preferably more than 98%, in comparison with the test line (3).

15. The control device (21, 211, 212, 23, 41, 42) for use in a water extinguishing system (1) according to at least one of the claims 1 to 14, wherein the control device (21, 211, 212, 23, 41, 42) is configured: - to determine at least one parameter indicative of a cross-section of a fluid bypass line (4), and - to control a pump test run of the pump (20) on the basis of the parameter.

16. A method for controlling a pump test run, in particular in a water extinguishing system (1) according to one of the claims 1 to 14, wherein the method comprises the following steps: providing a fluid bypass line (4) having a reduced cross-section compared with a test line (3) branching off from a supply line (2) of the pipe system (500), wherein the fluid bypass line (4) is configured to conduct a predefined portion of the extinguishing fluid around an opening element (31) of the test line (3) away from the pipe system (500), determining at least one parameter indicative of the cross-section of the fluid bypass line (4), and controlling, based on the parameter, the pump test run of the pump (20).

17. The method according to claim 16, further comprising arranging a temperature sensor (23) in the vicinity of the pump (20), and determining the parameter, wherein the parameter is indicative of a temperature of the extinguishing fluid in the vicinity of the pump (20).

18. A use of a fluid bypass line (4) in a water extinguishing system (1) for a pump test run of a pump (20), wherein the fluid bypass line (4) has a reduced cross-section in comparison with a test line (3) branching off from a supply line (2) and comprising an opening element (31), which is configured to be movable between a locking position, in which the opening element (31) closes the test line (3), and an unlocking position, in which the opening element (31) opens the test line (3), and wherein the fluid bypass line (3) is configured to conduct a predefined portion of the extinguishing fluid around the opening element (31) into a fluid reservoir (11) of the water extinguishing system (1).

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