Method for monitoring the operation of a pump station

Abstract

The present invention relates to a method for monitoring the operation of a pumping station (1), wherein the pumping station (1) includes: a storage tank (6) for temporarily storing liquid; an inlet (7) for liquid inflow; an outlet (8); and at least one pump (2) configured to deliver liquid out of the storage tank (6) through the outlet (8). The method is characterized by the following steps: monitoring the inflow of liquid into the storage tank (6) for at least a portion of a predetermined time period (T) and determining inflow data (IN) representing the amount of liquid flowing into the storage tank (6) of the pumping station (1) during the predetermined time period (T); determining pumping station maximum capacity data (PSMC) representing the maximum capacity of liquid pumped from the storage tank of the pumping station (1) during the predetermined time period (T); and, for the predetermined time period, using the general formula PSCU based on the determined values ​​of the inflow data (IN) and the pumping station maximum capacity data (PSMC). M (%) = 100 * IN / PSMC to determine the instantaneous pump station capacity utilization rate (PSCU) M ); and based on at least one instantaneous pump station capacity utilization rate (PSCU) M The value is used to determine the typical pump station capacity utilization rate (PSCU) of pump station (1). T The typical pump station capacity utilization rate (PSCU) T This indicates the capacity utilization rate of the pumping station over a period of time.

Description

Technical Field

[0001] The technical field of this invention is pumping stations and methods for monitoring the operation of such pumping stations, particularly pumping stations configured for pumping liquids (e.g., wastewater) comprising solids. The pumping station includes a storage tank for temporarily storing the liquid, an inlet for the liquid to flow into, an outlet, and at least one pump configured to deliver the liquid away from the storage tank through the outlet. The pumping station is operational both when the storage tank is capable of / configured to receive liquid and when the pump is active or inactive. Background Technology

[0002] Pumping stations typically have storage tanks for holding liquids, such as wells, reservoirs, holding tanks, or silos. In some pumping stations, there may be multiple wells / tanks, either separate or connected to each other. One or more pumps are used to move liquids into or out of the storage tanks. For example, pumps can be used to move wastewater from a storage tank in a wastewater pumping station or to pump fresh water into a holding tank in a clean water booster station.

[0003] Typical liquid storage tanks for wastewater have an inlet and an outlet. The inlet allows liquid to enter the tank, and the outlet removes / drains the liquid from the tank. Each liquid storage tank has one or more pumps associated with the outlet. The pumps, upon startup and operation, deliver liquid as needed based on appropriate control signals. A single operator may be responsible for many pumping stations distributed over a wide geographical area; for example, an operator may be responsible for hundreds or thousands of individual pumps. It is known to maintain and repair pumps and pumping stations at regular intervals. However, this can lead to pumps operating within acceptable parameters being repaired when not needed, and faulty pumps not being maintained when necessary, resulting in failure. It is also known to monitor pump operating parameters, such as the efficiency of an individual pump (the electrical energy required to move a stationary volume of liquid), to determine whether a pumping station is operating within acceptable parameters, and normal pumping station maintenance is based on these monitored parameters. However, pumping stations operate relative to each other and under different conditions (i.e., different operating environments) over time.

[0004] Urban populations and the presence of industry and businesses are constantly changing, therefore, wastewater generation varies over time in specific areas. Each wastewater delivery system is designed to handle a theoretical volume of wastewater upon installation. However, for a period after installation, there is no good way to determine the capacity utilization or capacity shortage risk of the system and different pumping stations, nor is there an optimal automated method to determine / optimize which parts of the system and / or pumping stations require upgrades or repair / maintenance.

[0005] Known prior art (e.g., US55979960 and EP3567173) discloses systems that provide alarms when an overflow occurs or is about to occur at a pumping station. However, such alarms are reactive rather than proactive.

[0006] Purpose of the invention

[0007] The objective of this invention is to eliminate the aforementioned drawbacks and defects of previously known pump station monitoring and control systems.

[0008] The main objective of this invention is to provide an improved method for monitoring pumping stations, which allows operators to more accurately compare the performance and capacity utilization of different pumping stations operating under different environmental conditions and over a period of time, thereby enabling the optimization of the maintenance and upkeep of the pumping stations.

[0009] The purpose of this invention is to provide an improved method for monitoring pumping stations, through which operators can understand the performance of pumping stations in relation to actual life conditions and determine the available capacity margin of the pumping station.

[0010] The purpose of this invention is to provide an improved method for monitoring pumping stations, which is proactive and provides operators with tools to determine relevant investments. Summary of the Invention

[0011] According to the invention, at least the primary objective is achieved by a method for monitoring the operation of a pumping station, initially defined as having the features specified in the independent claim. Preferred embodiments of the invention are further defined in the dependent claims.

[0012] According to the present invention, a method for monitoring the operation of a pumping station is provided, wherein the pumping station includes: a storage tank for temporarily storing liquid; an inlet for liquid inflow; an outlet; and at least one pump configured to deliver liquid out of the storage tank through the outlet, the method being characterized by the following steps:

[0013] - Monitor the inflow of liquid into the storage tank during at least a portion of a predetermined time period (T) and determine inflow data (IN) [volume per unit of time], which represents the inflow of liquid into the storage tank of the pumping station during the predetermined time period (T);

[0014] - Determine the maximum capacity data (PSMC) of the pumping station [volume per time unit], which represents the maximum capacity of liquid pumped from the storage tanks of the pumping station during a predetermined time period (T);

[0015] - For the predetermined time period, based on the determined values ​​of inflow data (IN) and pump station maximum capacity data (PSMC), the general formula PSCU is used. M (%) = 100 * IN / PSMC to determine the instantaneous pump station capacity utilization rate (PSCU) M );as well as

[0016] -Based on at least one instantaneous pump station capacity utilization rate (PSCU)M The value is used to determine the typical pump station capacity utilization rate (PSCU) of the pump station. T The typical pump station capacity utilization rate (PSCU) T This indicates the capacity utilization rate of the pumping station over a period of time.

[0017] Therefore, this invention is based on the insight that typical pump station capacity utilization (PSCU) of a pumping station can be determined according to one or more historical values. T Therefore, operators can monitor / analyze the typical pump station capacity utilization rate (PSCU). T The trend / development of the pumping station capacity utilization (PSCU) is monitored. Increasing trends and rates provide valuable input for operators and / or can automatically provide trend alerts to prevent future overflows. Operators can also monitor typical pumping station capacity utilization (PSCU) rates. T One or more values ​​are used to determine / analyze the overflow risk of a pumping station. Therefore, operators assess the capacity utilization rate of the pumping station, i.e., the capacity margin, in order to evaluate the overflow risk of different pumping stations.

[0018] In particular, the method of this invention will greatly improve the determination of maintenance / repair needs because the typical pump station capacity utilization rate (PSCU) is significantly improved. T The values ​​of [the pumping stations] can be compared over a period of time, i.e., before and after replacing or repairing pumps and / or components at a pumping station, which is not possible by known methods. Therefore, with the method of this invention, different pumping stations can be compared with each other. This provides operators with a method that will help them optimize maintenance and investment in a pumping station network.

[0019] Using the method according to the invention, it is possible to determine whether the size / design of the outlet pipe of a pumping station is optimal and / or whether the outlet pipe is blocked. In the method according to the invention, it is possible to compare old measurement data with new measurement data, regardless of whether the pumping station has been changed and / or the pump has been updated.

[0020] In various exemplary embodiments of the present invention, the step of determining inflow data (IN) includes the following sub-steps:

[0021] - Determine the rest time (REST) ​​required for the liquid level in the tank to rise from the pump stop level (STOP) to the pump start level (START) when no pump is active, where the rest time (REST) ​​is part of a predetermined time period (T).

[0022] - The inflow data (IN) is determined by dividing the volume (V) by a defined rest time (REST) ​​[V / REST], which represents the amount of liquid flowing in during a predetermined time period (T), where the volume (V) is the liquid volume in the tank between the pump start level (START) and the pump stop level (STOP).

[0023] In various exemplary embodiments of the present invention, the step of determining the pump station maximum capacity data (PSMC) includes the following sub-steps:

[0024] - Determine the run time (RUN) required for the liquid level in the storage tank to decrease from the pump start level (START) to the pump stop level (STOP) when all pumps in the pumping station are simultaneously active and operating at maximum operating speed, wherein this run time (RUN) is a portion of a predetermined time period (T); and

[0025] - The maximum capacity data (PSMC) of the pump station is determined by dividing the volume (V) by the determined running time (RUN) and adding the inflow data (IN) [(V / RUN)+IN], which represents the liquid inflow during a predetermined time period (T). The maximum capacity data (PSMC) of the pump station represents the maximum capacity of the pump station during the predetermined time period (T), where the volume (V) is the liquid volume in the tank between the pump start level (START) and the pump stop level (STOP).

[0026] Using the preferred embodiment described above will be advantageous, wherein the determination of instantaneous pump station capacity utilization depends only on rest time (REST) ​​and run time (RUN) that are already available in most pump station monitoring units.

[0027] However, the method of the present invention is not limited to all pumps operating at maximum operating speed at the same time, but is equally advantageous when not all pumps are operating effectively at the same time and / or when they are operating at reduced operating speed.

[0028] In various exemplary embodiments of the present invention, the pumping station includes a plurality of pumps consisting of a first subset of pumps (P1) and a second subset of pumps (P2), wherein the first subset of pumps (P1) and the second subset of pumps (P2) are not simultaneously valid during a predetermined time period (T), and the step of determining the pumping station maximum capacity data (PSMC) includes the following sub-steps:

[0029] - Determine the maximum capacity data (P1_MC) of the first subset in the first pump cycle during a predetermined time period (T), wherein the maximum capacity data (P1_MC) of the first subset represents the maximum capacity of the first pump subset (P1) during the predetermined time period (T).

[0030] - Determine the maximum capacity data (P2_MC) of the second subset in the second pump cycle during a predetermined time period (T), wherein the maximum capacity data (P2_MC) of the second subset represents the maximum capacity of the second pump subset (P2) during the predetermined time period (T), and

[0031] - The pump station maximum capacity data (PSMC) is determined by multiplying the reduction factor (X) by the sum of the first subset maximum capacity data (P1_MC) and the second subset maximum capacity data (P2_MC) [X*(P1_MC+P2_MC)]. The pump station maximum capacity data (PSMC) represents the maximum capacity of the pump station during a predetermined time period (T). The reduction factor is in the range of 0.5-0.9.

[0032] The inventor's key understanding is that the maximum capacity of all pumps in a pumping station is not the sum of the maximum capacities of each subset of pumps.

[0033] In various exemplary embodiments of the invention, the pumps of the first pump subset (P1) are simultaneously active and operate at a reduced operating speed less than the maximum operating speed, wherein the reduced operating speed corresponds to a reduced first outflow rate (P1_Q). R ) and the actual first run time (P1_RUN) required for the liquid level in the tank to drop from the pump start level (START) to the pump stop level (STOP). A The determination of the first running time (P1_RUN) includes setting the actual first running time (P1_RUN) to... A Multiply by the reduced first outflow (P1_Q) R ) and maximum first outflow (P1_Q) M The ratio between ) where, in the decreasing first outflow (P1_Q) R ) and maximum first outflow (P1_Q) M The ratio between the operating speed and the first outflow (P1_Q) is determined based on a predetermined relationship between the operating speed and the first outflow (P1_Q) and by reducing the operating speed.

[0034] In various exemplary embodiments of the present invention, the typical pump station capacity utilization rate (PSCU) T The data is compared with predetermined thresholds A and B, where A is in the range of 85-100%, and B is equal to the ratio of the lowest value in the first subset of maximum capacity data (P1_MC) and the second subset of maximum capacity data (P2_MC) divided by the maximum capacity data of the pump station (PSMC) [100*min(P1_MC; P2_MC) / PSMC], in order to estimate the capacity status of the pump station. Therefore, an automatic alarm can be triggered to assist the operator, i.e., when a peak inflow occurs or when a pump fails, indicating a risk of pump station overflow.

[0035] In another aspect, the present invention provides a computer-readable storage medium having a computer-readable program code portion embedded therein, wherein the computer-readable program code portion, when executed by a computer, causes the computer to perform the method steps according to claim 1 in order to determine a typical pump station capacity utilization (PSCU). T ).

[0036] Other advantages and features of the present invention will become clear from the following detailed description of preferred embodiments. Attached Figure Description

[0037] The above and other features and advantages of the present invention will be more fully understood through the following detailed description of preferred embodiments in conjunction with the accompanying drawings, in which:

[0038] Figure 1 This is a schematic diagram of an example embodiment of a pumping station according to the present invention. Detailed Implementation

[0039] This invention can be used for monitoring pumping stations and related processes. First, refer to... Figure 1 ,Should Figure 1 This indicates a pumping station 1, such as a wastewater pumping station, although it can pump other liquids, and the invention is not limited to wastewater.

[0040] Pump station 1 includes: at least one pump 2 having an inlet 3 and an outlet 4; and an outlet pipe 5 connected to the pump 2 and extending from the pump outlet 4. Pump station 1 includes a storage tank 6, also referred to as a reservoir, tank, etc., configured for temporary storage of liquid. Pump station 1 includes an inlet 7 for liquid entry / flow and an outlet 8 for liquid discharge / flow. Pump 2 is configured to deliver liquid away from storage tank 6 through outlet pipe 5 and said outlet 8. Pump 2 is preferably located within storage tank 6, and pump 2 can be located in a partially or fully submerged position or a dry position, or in a dry position outside storage tank 6.

[0041] The disclosed pump station 1 also includes a level sensor 9 located in the storage tank 6, preferably in a position where it is always submerged during operation of the pump station 1. Therefore, the level sensor 9 is preferably located below the inlet 3 of the pump 2. According to various alternative embodiments, the level sensor is a dry-mounted level sensor suspended above the liquid level and / or located outside the storage tank 6, such as using ultrasonic, radar, etc. According to various embodiments, the pump station 1 includes multiple level sensors, such as level switches located at different liquid levels in the storage tank (e.g., start-up and stop-down levels), which are tilted by the liquid surface. The purpose of the level sensor 9 is to start and stop the pump 2 when the liquid surface is at a predetermined level within the storage tank 6.

[0042] Typically, pump station 1 includes at least two pumps, wherein the second pump is used to prevent overflow and / or serve as a backup pump when the first pump fails and / or multiple pumps alternate. The second pump has an inlet and an outlet, with an outlet pipe 10 extending from the pump outlet and connected to the outlet pipe 5 of the first pump 2. Pump station 1 may include one or more check valves 11 arranged to prevent pumped flow from one pump from returning to storage tank 6 via another pump, and also to prevent liquid in the output line from returning to storage tank 6 when the pumps are stopped. The multiple pumps 2 may have the same or different dimensions, i.e., rated power and capacity.

[0043] The local control unit 12 is operatively connected to various sensors in pump 2 and pumping station 1, and also operatively connected to a remote / external control unit (not shown). The local control unit may be partially or completely located inside pump 2. An external outlet pipe is connected to the outlet 8 of storage tank 6, and the external outlet pipe directs the pumped liquid to, for example, another pumping station and / or wastewater treatment plant. All of the above descriptions in conjunction with at least one pump 2 may also be used for other pumps in pumping station 1. During operation of pumping station 1, the liquid level 13 in storage tank 6 will rise and fall according to the inflow of liquid and the operation of pump 2.

[0044] The method of the present invention includes the following steps:

[0045] - Monitor the inflow of liquid into the storage tank during at least a portion of a predetermined time period (T) and determine the inflow data (IN) [volume per unit of time], which represents the inflow of liquid into the storage tank 6 of pump station 1 during the predetermined time period (T);

[0046] - Determine the maximum capacity data (PSMC) of the pumping station [volume per time unit], which represents the maximum capacity of liquid pumped from the storage tank 6 of the pumping station during a predetermined time period (T);

[0047] - For the predetermined time period, based on the determined values ​​of inflow data (IN) and pump station maximum capacity data (PSMC), the general formula PSCU is used. M (%) = 100 * IN / PSMC to determine the instantaneous pump station capacity utilization rate (PSCU) M );as well as

[0048] -Based on at least one instantaneous pump station capacity utilization rate (PSCU) M The value is used to determine the typical pump station capacity utilization rate (PSCU) of pump station 1. T The typical pump station capacity utilization rate (PSCU) T This indicates the capacity utilization rate of pump station 1 over a period of time.

[0049] The predetermined time period (T) is preferably one or more pump cycles, wherein each pump cycle extends from one shutdown of pump 2 to the next shutdown of pump 2, including a period when pump 2 is inactive and the liquid level 13 in tank 6 increases (rises) and a period when pump is active and the liquid level 13 in tank 6 decreases (falls). According to embodiments where the predetermined time period (T) includes multiple pump cycles, the pump cycles are preferably continuous. According to various alternatives, the predetermined time period (T) consists of one hour or more, one day or more (i.e., 24 hours), or one week or more weeks. It is well known that the inflow to pumping station 1 will vary throughout the day, week, and year. Preferably, the predetermined time period (T) is equal to or less than one hour.

[0050] Capacity is the amount of liquid that can be delivered from or through pump station 1. Capacity depends on the maximum capacity of different pumps, the diameter of the outlet pipe, and the wear and condition of the pumps and pipes. Capacity utilization is the ratio of the inflow rate of the liquid to the capacity of pump station 1.

[0051] The inflow data (IN) (i.e., the inflow to pump station 1) and the maximum pump station capacity data (PSMC) (i.e., the maximum outflow from pump station 1) are quantified into volume per unit of time, such as liters per second. The inflow data (IN) can be composed of the actual / true inflow over the entire predetermined time period (T), the actual / true inflow during a portion of the time period (T), or the average of multiple measurements over the time period (T), etc. In other words, the inflow data (IN) should provide a good representation of the inflow volume / characteristics over the predetermined time period (T). The maximum pump station capacity data (PSMC) can be composed of the actual / true volume of liquid pumped over the entire predetermined time period (T), the actual / true pumped volume during a portion of the time period (T), or the average of multiple measurements over the time period (T), etc. In other words, the maximum pump station capacity data (PSMC) should provide a good representation of the pumped volume / characteristics over the predetermined time period (T).

[0052] The maximum capacity data (PSMC) of the pumping station corresponds to the maximum outflow (Q) corresponding to all pumps 2 in pumping station 1 operating simultaneously at their maximum operating speed (e.g., rated operating speed). M Due to wear of pump 2, blockage of the outlet pipe, size of pump 2, size of the outlet pipe, number of pumps 2 in pumping station 1, etc., the maximum outflow (Q) MThe maximum output volume (PSMC) of pump station 1 will change over time. Therefore, the PSMC should provide a good representation of the maximum output volume from pump station 1 (i.e., pump 2 from pump station 1). It should be noted that in some pump stations and / or under certain circumstances, due to physical or design constraints of the specific pump station and / or outlet piping, not all installed pumps 2 in pump station 1 are permitted to be simultaneously effective and / or operate at their rated operating speed. Therefore, in this document, the term "all pumps 2 of pump station 1 simultaneously effective and operating at maximum operating speed" should be understood as referring to "a combination of pumps 2 in pump station 1 that is permitted to be simultaneously effective and operating at the maximum permissible operating speed, and providing the maximum outflow (Q) from pump station 1." M Therefore, the maximum outflow (Q) from the pumping station is provided. M The maximum permissible speed does not necessarily have to be the rated operating speed.

[0053] Typical pump station capacity utilization rate (PSCU) of pump station 1 T Based on at least one instantaneous pump station capacity utilization rate (PSCU) M The value is preferably multiple instantaneous values. Typical pump station capacity utilization rate (PSCU) T A good representation of the capacity utilization rate of pump station 1 over a period of time should be provided. Typical pump station capacity utilization rate (PSCU) T The maximum instantaneous pump station capacity utilization rate (PSCU) can be calculated based on daily, weekly, and monthly rates. M The value is composed of, or multiple instantaneous pump station capacity utilization rates (PSCU) for daily, weekly, monthly, etc. M It can be composed of the average value of the previous month, quarter, half-year, etc.

[0054] Typical pump station capacity utilization rate (PSCU) of pump station 1 T The values ​​and trends of typical values ​​provide operators with a basis for making decisions regarding repair, maintenance, upgrades, expansion, etc.

[0055] According to various embodiments, the step of determining inflow data (IN) includes the following sub-steps:

[0056] - Determine the rest time (REST) ​​required for the liquid level in tank 6 to rise from the pump stop level (STOP) to the pump start level (START) when no pump is active, wherein this rest time (REST) ​​is part of a predetermined time period (T).

[0057] - The inflow data (IN) is determined by dividing the volume (V) by a defined rest time (REST) ​​[V / REST], which represents the amount of liquid flowing in during a predetermined time period (T), wherein the volume (V) is the liquid volume in tank 6 between the pump start level (START) and the pump stop level (STOP).

[0058] When pump 2 is not active, it is defined as no liquid is being discharged from the pumping station. Therefore, the slowly rotating impeller in the pump will not produce any outflow, and pump 2 is defined as inactive. Alternatively, the volume (V) and rest time (REST) ​​can be determined using other known / preset liquid levels in tank 6. Therefore, the volume (V) and rest time (REST) ​​can be determined in many different ways, rather than using the pump start level (START) and pump stop level (STOP), i.e., using a subset of the volume between the pump stop level and the pump start level. Therefore, more generally, in this document, the volume (V) should be considered as the predetermined volume in tank 6, defined by the upper liquid level (UP) and the lower liquid level (LOW), and the rest time (REST) ​​should be determined using the lower liquid level (LOW) and the upper liquid level (UP), where the pump start level (START) and the pump stop level (STOP) are specific values ​​of the general terms upper liquid level (UP) and lower liquid level (LOW), respectively.

[0059] Therefore, according to various embodiments, the step of determining inflow data (IN) includes the following sub-steps:

[0060] - Determine the rest time (REST) ​​required for the liquid level in storage tank 6 to rise from the lower level (LOW) to the upper level (UP) when pump 2 is not active, wherein this rest time (REST) ​​is part of a predetermined time period (T).

[0061] - The inflow data (IN) is determined by dividing the volume (V) by a defined rest time (REST) ​​[V / REST], which represents the amount of liquid flowing in during a predetermined time period (T), wherein the volume (V) is the liquid volume in the tank 6 between the upper liquid level (UP) and the lower liquid level (LOW).

[0062] According to an alternative embodiment, inlet flow meter 14 is used to determine inflow data (IN) in order to determine the actual inflow amount in a portion or the entire predetermined time period (T).

[0063] When all pumps 2 are simultaneously active and operating at maximum operating speed, the steps for determining the pump station maximum capacity data (PSMC) include the following sub-steps:

[0064] - Determine the running time (RUN) required for the liquid level in storage tank 6 to decrease from the pump start level (START) to the pump stop level (STOP), wherein this running time (RUN) is part of a predetermined time period (T), and

[0065] - The maximum capacity data (PSMC) of the pump station is determined by dividing the volume (V) by the determined running time (RUN) and adding the inflow data (IN) [(V / RUN)+IN] which represents the liquid inflow during the predetermined time period (T). The maximum capacity data (PSMC) of the pump station represents the maximum capacity of the pump station 1 during the predetermined time period (T).

[0066] Alternatively, the running time (RUN) can be determined using other known / defined liquid levels in tank 6. Consistent with the above, the running time (RUN) can be determined in many different ways, rather than using the pump start level (START) and pump stop level (STOP), i.e., using a subset of the volume between the pump stop level and the pump start level. Therefore, more typically, as described herein, the running time (RUN) should be determined using the upper liquid level (UP) and the lower liquid level (LOW).

[0067] Therefore, according to the alternative embodiment, when all pumps 2 are simultaneously active and operating at maximum operating speed, the step of determining the pump station maximum capacity data (PSMC) includes the following sub-steps:

[0068] - Determine the running time (RUN) required for the liquid level in storage tank 6 to decrease from the upper liquid level (UP) to the lower liquid level (LOW), wherein this running time (RUN) is part of a predetermined time period (T), and

[0069] - The maximum capacity data (PSMC) of the pump station is determined by dividing the volume (V) by the determined running time (RUN) and adding the inflow data (IN) [(V / RUN)+IN] representing the liquid inflow during the predetermined time period (T). The maximum capacity data (PSMC) of the pump station 1 represents the maximum capacity of the pump station 1 during the predetermined time period (T), wherein the volume (V) is the liquid volume in the storage tank 6 between the upper liquid level (UP) and the lower liquid level (LOW).

[0070] Therefore, according to a preferred embodiment, a single pump cycle consists of a rest period (REST) ​​and a run period (RUN).

[0071] According to an optional embodiment, the pump station maximum capacity data (PSMC) is determined using the outlet flow meter 15 in order to determine the actual outflow during a portion or the entire predetermined time period (T).

[0072] When using the preferred embodiment to determine the inflow data (IN) and the station maximum capacity data (PSMC), the volume (V) parameter is in both the numerator and the denominator and can be omitted / excluded.

[0073] All pumps 2 are simultaneously active and operate at maximum / rated operating speed, for example, in a so-called outlet pipe cleaning sequence, which can be scheduled in control unit 12, manually started by the operator, automatically started by control unit 12 as needed, or when one pump 2 has insufficient high inflow. In a well-functioning and properly sized pump station 1, it is almost unnecessary for all pumps 2 to be simultaneously active and operating at maximum / rated operating speed in order to process the incoming liquid.

[0074] According to various embodiments, pumping station 1 includes a plurality of pumps 2, which are composed of a first subset of pumps (P1) and a second subset of pumps (P2). In most pumping stations 1, the first subset of pumps (P1) and the second subset of pumps (P2) are each composed of a single pump 2; however, the first subset of pumps (P1) and / or the second subset of pumps (P2) may include a plurality of pumps 2.

[0075] When all pumps 2 are not simultaneously active, and the active pumps 2 are operating at maximum operating speed, the steps for determining the pump station maximum capacity data (PSMC) include the following sub-steps:

[0076] - Determine the maximum capacity data (P1_MC) of the first subset in the first pump cycle during a predetermined time period (T), wherein the maximum capacity data (P1_MC) of the first subset represents the maximum capacity of the first pump subset (P1) during the predetermined time period (T).

[0077] - Determine the maximum capacity data (P2_MC) of the second subset in the second pump cycle during a predetermined time period (T), wherein the maximum capacity data (P2_MC) of the second subset represents the maximum capacity of the second pump subset (P2) during the predetermined time period (T), and

[0078] - The pump station maximum capacity data (PSMC) is determined by multiplying the reduction factor (X) by the sum of the first subset maximum capacity data (P1_MC) and the second subset maximum capacity data (P2_MC) [X*(P1_MC+P2_MC)]. The pump station maximum capacity data (PSMC) represents the maximum capacity of the pump station during a predetermined time period (T). The reduction factor is in the range of 0.6-0.9.

[0079] It should be noted that either the first pump cycle or the second pump cycle can occur first in time, and the pump cycles can occur directly after each other, or be separated in time.

[0080] A reduction factor (X) is used because the maximum outflow (Q) is calculated when all pumps 2 are active and operating at maximum operating speed. M This is not equal to the sum of the individual outflows of each pump 2. This phenomenon arises from the increased flow resistance (relative to the increased flow velocity) in the outlet pipe.

[0081] By default, the reduction factor (X) is preferably set to 0.7. However, the reduction factor (X) is preferably updated at regular intervals based on known values ​​of the pump station maximum capacity data (PSMC), the first subset maximum capacity data (P1_MC), and the second subset maximum capacity data (P2_MC). Preferably, the last known value of the setting parameter is used. These values / parameters are determined as described above and below. The reduction factor (X) is updated / determined by dividing the pump station maximum capacity data (PSMC) by the sum of the first subset maximum capacity data (P1_MC) and the second subset maximum capacity data (P2_MC) [PSMC / (P1_MC+P2_MC)].

[0082] According to various embodiments, the step of determining the maximum capacity data (P1_MC) of the first subset includes the following sub-steps:

[0083] - Determine the first running time (P1_RUN) required for the liquid level 13 in tank 6 to decrease from the pump start level (START) to the pump stop level (STOP) when all pumps in the first pump subset (P1) are simultaneously active and operating at maximum operating speed, wherein this first running time (P1_RUN) is part of a predetermined time period (T), and

[0084] - The first subset maximum capacity data (P1_MC) is determined by dividing the volume (V) by the determined first running time (P1_RUN) and adding the first inflow data (P1_IN) [(V / P1_RUN)+P1_IN] representing the liquid inflow in the first pump cycle.

[0085] According to various embodiments, the first incoming data (P1_IN) is determined using the following sub-steps:

[0086] - Determine the first rest time (P1_REST) ​​required for the liquid level 13 in tank 6 to rise from the pump stop level (STOP) to the pump start level (START) when pump 2 is not active, wherein this first rest time (P1_REST) ​​is part of a predetermined time period (T), and

[0087] - The first inflow data (P1_IN) is determined by dividing the volume (V) by the determined first rest time (P1_REST) ​​[V / P1_REST], which represents the amount of liquid flowing in during a predetermined time period (T).

[0088] According to various embodiments, the step of determining the maximum capacity data (P2_MC) of the second subset includes the following sub-steps:

[0089] - Determine the second running time (P2_RUN) required for the liquid level 13 in tank 6 to decrease from the pump start level (START) to the pump stop level (STOP) when all pumps in the second pump subset (P2) are simultaneously active and operating at maximum operating speed, wherein this second running time (P2_RUN) is part of a predetermined time period (T), and

[0090] - The second subset maximum capacity data (P2_MC) is determined by dividing the volume (V) by the determined second running time (P2_RUN) and adding the second inflow data (P2_IN) [(V / P2_RUN)+P2_IN], which represents the amount of liquid flowing in during the second pump cycle.

[0091] According to various embodiments, the second inflow data (P2_IN) is determined using the following sub-steps:

[0092] - Determine the second rest time (P2_REST) ​​required for the liquid level in tank 6 to rise from the pump stop level (STOP) to the pump start level (START) when pump 2 is not active, wherein this second rest time (P2_REST) ​​is part of a predetermined time period (T), and

[0093] - The second inflow data (P2_IN) is determined by dividing the volume (V) by the determined second rest time (P2_REST) ​​[V / P2_REST], which represents the amount of liquid flowing in during a predetermined time period (T).

[0094] According to an alternative embodiment, the first rest time (P1_REST) ​​and the second rest time (P2_REST) ​​can be the same value and determined simultaneously. It should be noted that when pump station 1 comprises more than two different subsets of pumps, the above logic is replicated / applied to each possible subset of pumps.

[0095] When all pumps 2 are not simultaneously active, and the active pumps 2 operate at a reduced operating speed (less than the maximum operating speed), compensation is necessary to determine the aforementioned operating times for the first pump subset (P1) and the second pump subset (P2). For each pump subset in a given pumping station 1, there is a known / predetermined relationship between operating speed and flow rate. The maximum operating speed provides the maximum flow rate, and reducing the operating speed provides a reduced flow rate. Pumps 2 include internal and / or external variable frequency drives (VFDs) for operation at reduced operating speeds.

[0096] Therefore, when the pumps of the first pump subset (P1) are simultaneously active and operating at a reduced operating speed, the reduced operating speed corresponds to a reduction in the first outflow (P1_Q). R The determination of the first running time (P1_RUN) includes the actual first running time (P1_RUN) required for the liquid level in tank 6 to decrease from the pump start level (START) to the pump stop level (STOP). A Multiply by the decrease in the first outflow (P1_Q) R ) and maximum first outflow (P1_Q) M The ratio between ) where, in reducing the first outflow (P1_Q) R ) and maximum first outflow (P1_Q) M The ratio between the operating speed and the first outflow (P1_Q) is determined based on a predetermined relationship between the operating speed and the first outflow (P1_Q) and by reducing the operating speed.

[0097] Therefore, when the pumps of the second pump subset (P2) are simultaneously active and operating at a reduced operating speed, the reduced operating speed corresponds to a reduction in the second outflow (P2_Q). R The actual second run time (P2_RUN) required for the liquid level in tank (6) to decrease from the pump start level (START) to the pump stop level (STOP) A Determining the second running time (P2_RUN) includes determining the actual second running time (P2_RUN). A Multiply by the decrease in the second outflow (P2_Q) R ) and the maximum second outflow (P2_Q) M The ratio between ) where, in reducing the second outflow (P2_Q) R ) and the maximum second outflow (P2_Q) M The ratio between the two is determined based on the predetermined relationship between the operating speed and the second outflow (P2_Q) and the reduction of the operating speed.

[0098] As with the above, it should be noted that, alternatively, the first running time, the second running time, the first rest time, the second rest time, etc., can be determined using the general terms upper level (UP) and lower level (LOW), rather than the specific terms pump start level (START) and pump stop level (STOP).

[0099] When the operator or control unit 12 accesses the typical pump station capacity utilization (PSCU) TWhen the value is set, it can be compared with predetermined thresholds A and B to estimate the capacity status of pumping station 1. Threshold A is preferably in the range of 85-100%, and threshold B is preferably equal to the ratio of the lowest value in the first subset of maximum capacity data (P1_MC) and the second subset of maximum capacity data (P2_MC) divided by the maximum capacity data of the pumping station (PSMC) [100*min(P1_MC; P2_MC) / PSMC]. Threshold B is typically in the range of 60-80%.

[0100] Typical pump station capacity utilization rate (PSCU) T It is determined based on the weekly peak of the most recent 1-10 weeks, or the weekly average of the most recent 1-10 weeks, or the 1-10 highest historical values.

[0101] When the typical pump station capacity utilization rate (PSCU) T There is no problem when the flow rate is below the threshold B, because each pump 2 is able to pump the typical inflow rate.

[0102] When the typical pump station capacity utilization rate (PSCU) T When the flow rate is below threshold A but above threshold B, there may be a problem with the discharge / pumping of typical inflow when a pump 2 fails.

[0103] When the typical pump station capacity utilization rate (PSCU) T When the flow rate is above the threshold A, there is an urgent problem of handling the typical inflow rate, since not even all pumps can pump the typical inflow rate.

[0104] A computer-readable storage medium has a computer-readable program code portion embedded therein, wherein the computer-readable program code portion, when executed by a computer, causes the computer to perform the steps of the method of the present invention in order to determine a typical pumping station capacity utilization (PSCU). T The computer program product is preferably located in a control unit 12 that can be connected to the pump or pumping station via wired or wireless means, in an external computer, in the cloud, in a service / diagnostic tool, in a tablet computer / mobile phone, etc.

[0105] Possible variations of the invention

[0106] This invention is not limited to the embodiments described above and shown in the accompanying drawings, which are primarily for illustrative and exemplary purposes. This patent application will cover all modifications and variations of the preferred embodiments described herein, and therefore, the invention is determined by the wording of the appended claims and their equivalents. Consequently, the device can be modified in various ways within the scope of the appended claims.

[0107] Throughout the specification and the following claims, unless the context otherwise requires, the word “comprising” and its variations (e.g., “including” or “containing”) shall be understood to imply inclusion of the said integer or step or group of integers or steps, but not to exclude any other integer or step or group of integers or steps.

Claims

1. A method for monitoring the operation of a pumping station (1), wherein, The pump station (1) includes: a storage tank (6) for temporarily storing liquid; an inlet (7) for liquid to flow into; an outlet (8); and at least one pump (2) configured to deliver liquid away from the storage tank (6) through the outlet (8). The method is characterized by the following steps: - Monitor the inflow of liquid into the storage tank (6) during at least a portion of a predetermined time period (T) and determine the inflow data (IN) [volume per unit of time], which represents the inflow of liquid into the storage tank (6) of the pump station (1) during the predetermined time period (T); - Determine the maximum capacity data (PSMC) [volume per time unit] of the pump station, which represents the maximum capacity of liquid pumped from the storage tank (6) of the pump station (1) during a predetermined time period (T); - For the predetermined time period, based on the determined values ​​of inflow data (IN) and pump station maximum capacity data (PSMC), the general formula PSCU is used. M (%) = 100*IN / PSMC to determine the instantaneous pump station capacity utilization rate (PSCU) M );as well as -Based on at least one instantaneous pump station capacity utilization rate (PSCU) M The value of ) determines the typical pump station capacity utilization rate (PSCU) of pump station (1). T The typical pump station capacity utilization rate represents the capacity utilization rate of pump station (1) over a period of time.

2. The method according to claim 1, wherein: The steps to determine inflow data (IN) include the following sub-steps: - Determine the rest time (REST) ​​required for the liquid level (13) in the storage tank (6) to rise from the pump stop level (STOP) to the pump start level (START) when no pump (2) is active, wherein the rest time (REST) ​​is a part of a predetermined time period (T). - The inflow data (IN) is determined by dividing the volume (V) by a predetermined rest time (REST) ​​[V / REST], which represents the amount of liquid flowing in during a predetermined time period (T), wherein the volume (V) is the liquid volume in the tank (6) between the pump start level (START) and the pump stop level (STOP).

3. The method according to claim 1 or 2, wherein: The maximum capacity data (PSMC) of the pumping station is the maximum outflow (Q) corresponding to all pumps (2) in the pumping station (1) being simultaneously effective and operating at maximum operating speed. M ).

4. The method according to claim 1 or 2, wherein: The steps for determining the pumping station maximum capacity data (PSMC) include the following sub-steps: - Determine the running time (RUN) required for the liquid level (13) in the storage tank (6) to decrease from the pump start level (START) to the pump stop level (STOP) when all pumps (2) in the pumping station (1) are simultaneously active and operating at maximum operating speed, wherein the running time (RUN) is a part of a predetermined time period (T); and - The maximum capacity data (PSMC) of the pump station is determined by dividing the volume (V) by the determined running time (RUN) and adding the inflow data (IN) [(V / RUN)+IN] representing the liquid inflow during a predetermined time period (T), wherein the maximum capacity data of the pump station (1) represents the maximum capacity of the pump station (1) during the predetermined time period (T), wherein the volume (V) is the liquid volume in the storage tank (6) between the pump start level (START) and the pump stop level (STOP).

5. The method according to claim 4, wherein: The pumping station (1) comprises multiple pumps (2) consisting of a first pump subset (P1) and a second pump subset (P2), wherein the first pump subset (P1) and the second pump subset (P2) are not simultaneously effective during a predetermined time period (T). The reduction factor (X) is determined using the following sub-steps: - Determine the maximum capacity data (P1_MC) of the first subset in the first pump cycle during a predetermined time period (T), wherein the maximum capacity data (P1_MC) of the first subset represents the maximum capacity of the first pump subset (P1) during the predetermined time period (T). - Determine the maximum capacity data (P2_MC) of the second subset in the second pump cycle during a predetermined time period (T), wherein the maximum capacity data (P2_MC) of the second subset represents the maximum capacity of the second pump subset (P2) during the predetermined time period (T), and - The reduction factor (X) is determined by dividing the maximum capacity data of the pump station (PSMC) by the sum of the maximum capacity data of the first subset (P1_MC) and the maximum capacity data of the second subset (P2_MC) [PSMC / (P1_MC+P2_MC)].

6. The method according to claim 1, wherein: The pumping station (1) comprises multiple pumps (2) consisting of a first pump subset (P1) and a second pump subset (P2), wherein the first pump subset (P1) and the second pump subset (P2) are not simultaneously valid during a predetermined time period (T). The steps for determining the maximum capacity data (PSMC) of the pumping station include the following sub-steps: - Determine the maximum capacity data (P1_MC) of the first subset in the first pump cycle during a predetermined time period (T), wherein the maximum capacity data (P1_MC) of the first subset represents the maximum capacity of the first pump subset (P1) during the predetermined time period (T). - Determine the maximum capacity data (P2_MC) of the second subset in the second pump cycle during a predetermined time period (T), wherein the maximum capacity data (P2_MC) of the second subset represents the maximum capacity of the second pump subset (P2) during the predetermined time period (T), and - The pump station maximum capacity data (PSMC) is determined by multiplying the reduction factor (X) by the sum of the first subset maximum capacity data (P1_MC) and the second subset maximum capacity data (P2_MC) [X*(P1_MC+P2_MC)], the pump station maximum capacity data representing the maximum capacity of the pump station (1) in a predetermined time period (T), wherein the reduction factor is in the range of 0.6 to 0.

9.

7. The method according to claim 6, wherein: The steps to determine the maximum capacity data (P1_MC) of the first subset include the following sub-steps: - Determine the first running time (P1_RUN) required for the liquid level in the storage tank (6) to decrease from the pump start level (START) to the pump stop level (STOP) when all pumps in the first pump subset (P1) are simultaneously active and operating at maximum operating speed, wherein the first running time (P1_RUN) is a part of a predetermined time period (T), and - The first subset maximum capacity data (P1_MC) is determined by dividing the volume (V) by the determined first running time (P1_RUN) and adding the first inflow data (P1_IN) [(V / P1_RUN)+P1_IN], where the first inflow data represents the amount of liquid flowing in during the first pump cycle, wherein the volume (V) is the liquid volume in the tank (6) between the pump start level (START) and the pump stop level (STOP).

8. The method according to claim 7, wherein: The first inflow of data (P1_IN) includes the following sub-steps: - Determine the first rest time (P1_REST) ​​required for the liquid level in the storage tank (6) to rise from the pump stop level (STOP) to the pump start level (START) when no pump (2) is active, wherein the first rest time (P1_REST) ​​is a part of a predetermined time period (T), and - The first inflow data (P1_IN) is determined by dividing the volume (V) by the determined first rest time (P1_REST) ​​[V / P1_REST], the first inflow data representing the amount of liquid inflow during a predetermined time period (T), wherein the volume (V) is the liquid volume in the tank (6) between the pump start level (START) and the pump stop level (STOP).

9. The method according to any one of claims 6-8, wherein: The steps to determine the maximum capacity data (P2_MC) of the second subset include the following sub-steps: - Determine the second running time (P2_RUN) required for the liquid level in the storage tank (6) to decrease from the pump start level (START) to the pump stop level (STOP) when all pumps in the second pump subset (P2) are simultaneously active and operating at maximum operating speed, wherein the second running time (P2_RUN) is a part of a predetermined time period (T), and - The second subset maximum capacity data (P2_MC) is determined by dividing the volume (V) by the determined second running time (P2_RUN) and adding the second inflow data (P2_IN) [(V / P2_RUN)+P2_IN], the second inflow data representing the liquid inflow in the second pump cycle, wherein the volume (V) is the liquid volume in the tank (6) between the pump start level (START) and the pump stop level (STOP).

10. The method according to claim 9, wherein: The second inflow data (P2_IN) includes the following sub-steps: - Determine the second rest time (P2_REST) ​​required for the liquid level in the storage tank (6) to rise from the pump stop level (STOP) to the pump start level (START) when no pump (2) is active, wherein the second rest time (P2_REST) ​​is part of a predetermined time period (T), and - The second inflow data (P2_IN) is determined by dividing the volume (V) by the determined second rest time (P2_REST) ​​[V / P2_REST], the second inflow data representing the liquid inflow during a predetermined time period (T), wherein the volume (V) is the liquid volume in the tank (6) between the pump start level (START) and the pump stop level (STOP).

11. The method according to claim 7 or 8, wherein: The pumps in the first pump subset (P1) are all active and operate at a reduced operating speed, which is less than the maximum operating speed and corresponds to a reduction in the first outflow rate (P1_Q). R ) and the actual first run time (P1_RUN) required for the liquid level (13) in the storage tank (6) to drop from the pump start level (START) to the pump stop level (STOP). A The determination of the first running time (P1_RUN) includes determining the actual first running time (P1_RUN). A Multiply by the decrease in the first outflow (P1_Q) R ) and maximum first outflow (P1_Q) M The ratio between ) where, decreasing the first outflow (P1_Q) R ) and maximum first outflow (P1_Q) M The ratio between the operating speed and the first outflow (P1_Q) is determined based on the predetermined relationship between the operating speed and the first outflow (P1_Q) and by reducing the operating speed.

12. The method according to claim 9, wherein: The pumps in the second pump subset (P2) are simultaneously active and operate at a reduced operating speed, which is less than the maximum operating speed and corresponds to a reduction in the second outflow rate (P2_Q). R The actual second run time (P2_RUN) required for the liquid level (13) in the storage tank (6) to decrease from the pump start level (START) to the pump stop level (STOP) is recorded. A The determination of the second running time (P2_RUN) includes determining the actual second running time (P2_RUN). A Multiply by the decrease in the second outflow (P2_Q) R ) and the maximum second outflow (P2_Q) M The ratio between ) where, decreasing the second outflow (P2_Q) R ) and the maximum second outflow (P2_Q) M The ratio between the operating speed and the second outflow (P2_Q) is determined based on the predetermined relationship between the operating speed and the second outflow (P2_Q) and by reducing the operating speed.

13. The method according to any one of claims 5-8, 10 and 12, wherein: Typical pump station capacity utilization rate (PSCU) T The capacity status of the pump station (1) is estimated by comparing the minimum value of the first subset maximum capacity data (P1_MC) and the second subset maximum capacity data (P2_MC) with predetermined thresholds A and B, where A is in the range of 85-100% and B is equal to the ratio of the minimum value of the first subset maximum capacity data (P1_MC) and the second subset maximum capacity data (P2_MC) to the maximum capacity data of the pump station (PSMC) [100*min(P1_MC; P2_MC) / PSMC].

14. The method according to claim 9, wherein: Typical pump station capacity utilization rate (PSCU) T The capacity status of the pump station (1) is estimated by comparing the minimum value of the first subset maximum capacity data (P1_MC) and the second subset maximum capacity data (P2_MC) with predetermined thresholds A and B, where A is in the range of 85-100% and B is equal to the ratio of the minimum value of the first subset maximum capacity data (P1_MC) and the second subset maximum capacity data (P2_MC) to the maximum capacity data of the pump station (PSMC) [100*min(P1_MC; P2_MC) / PSMC].

15. The method according to claim 11, wherein: Typical pump station capacity utilization rate (PSCU) T The capacity status of the pump station (1) is estimated by comparing the minimum value of the first subset maximum capacity data (P1_MC) and the second subset maximum capacity data (P2_MC) with predetermined thresholds A and B, where A is in the range of 85-100% and B is equal to the ratio of the minimum value of the first subset maximum capacity data (P1_MC) and the second subset maximum capacity data (P2_MC) to the maximum capacity data of the pump station (PSMC) [100*min(P1_MC; P2_MC) / PSMC].

16. The method according to claim 1 or 2, wherein: Typical pump station capacity utilization rate (PSCU) T It is determined based on the weekly peak of the most recent 1-10 weeks, or the weekly average of the most recent 1-10 weeks, or the 1-10 highest historical values.

17. A computer-readable storage medium having a portion of computer-readable program code embedded therein, wherein, The computer-readable program code portion, when executed by a computer, causes the computer to perform the steps of the method according to claim 1, in order to determine the typical pump station capacity utilization (PSCU). T ).

Images