A ship compressed air pressure displacement test system and design method

Abstract

The present application relates to a kind of ship compressed air pressure discharge test system and design method, using a kind of scale equivalent design method, to the typical cabin section of real ship pressure discharge system is reasonably scaled, for determining the size of the ballast cabin section of the typical cabin section scale model test system needed to be built, equipment configuration capacity, pipe diameter size, system characteristic index, and on the basis of typical cabin section after scaling, for meeting the research needs corresponding remote control valve, sensor, test control system etc., establish reasonable test system, it has important significance in verifying the performance of ship compressed air pressure discharge system effectively, ensuring to meet the design operation index requirements etc..

Description

Technical Field

[0001] The present invention relates to a ship compressed air pressure displacement test system and a design method, belonging to the technical field of ship sinking and buoyancy and attitude balance control system test. Background Art

[0002] The ship's ballast water discharge system uses ballast pumps, compressed air, or gravity to inject or discharge ballast water into the ballast tanks, thereby achieving the ship's sinking and floating. During the ship design phase, the designer preliminarily determines the ballast discharge method based on the ship's ballast tank layout, tank capacity data, and sinking and floating operation control requirements, completes the ballast discharge system design, and forms a preliminary design scheme for the ship's ballast water discharge system. However, to verify whether this design scheme meets the requirements of pipeline flow rate, ship sinking and floating time index requirements, and the characteristics of different ballast discharge methods, commercial software is generally used to simulate the system resistance. However, there are still certain differences between the selection of component resistance coefficients and modeling methods in the simulation calculation and the actual situation. Therefore, the simulation calculation method is not sufficient as a basis for verifying the design scheme and studying resistance characteristics.

[0003] Especially for ships that use compressed air pressure displacement method and have high requirements for pressure displacement time, model tests based on actual ship schemes are of great significance for verifying the characteristics of compressed air pressure displacement system and the actual task completion time. However, the scale of ship ballast tanks is generally large. If a model test system is established in proportion, there will be great difficulties in the selection of test sites, equipment configuration, model construction, etc., and the economy is poor. How to reduce the scale of the model test system and reflect the technical status of the actual ship system equivalently is a major problem in current design verification. The present invention proposes a design method for a compressed air pressure displacement scale test system, which intercepts a typical compartment and simulates the actual ship status based on the scale equivalence theory, and adds the settings of corresponding remote control valves, sensors, test control systems, etc., which are used to test and verify the rationality of the actual ship design scheme and study the resistance characteristics of different pressure displacement methods. Summary of the Invention

[0004] In order to appropriately reduce the size of the test system to reduce the difficulty and cost of the test system in terms of test site selection, equipment configuration, model construction, etc., and to effectively verify the performance of the ship's compressed air pressure displacement system, the present invention proposes a ship compressed air pressure displacement test system and design method. The test system designed based on the scale equivalence theory includes a ballast tank, a displacement air compressor, a vacuum pump, a compressed air pipeline system, a vacuum pipeline system, a sea pipeline system, a ventilation pipeline system, an automatic pitch and roll compensation system, valve accessories, sensors, a test console (including control software), etc., which can simulate the capabilities and characteristics of the actual ship's compressed air pressure displacement system, and can be used to test and verify the rationality of the actual ship's design scheme, and study the resistance characteristics of different pressure displacement methods.

[0005] To achieve the above-mentioned purpose, the technical solution of the present invention is: a design method for a ship compressed air pressure displacement load test system, which adopts a scaled equivalent design method. The method is based on the preliminary design plan of the ship's pressure displacement load, selects a typical simulation section, and preliminarily determines the scale ratio λ. According to the equivalent theory, the relevant characteristic parameters of the actual ship's pressure displacement load system are scaled down: and based on the scaled equivalent design method, the compressed air pressure displacement load system of the typical section of the actual ship is scaled down and equivalent, and the obtained ballast section size, equipment configuration capacity, pipe diameter size, and characteristic index parameters are used as the basis for building the test system.

[0006] Furthermore, based on the equivalent theory, the relevant characteristic parameters of the actual ship's ballast displacement system are scaled down, including:

[0007] (1) Scale: L s / L m =λ, where L s —Geometric dimensions of the actual ship, L m —Geometric dimensions of the test model, applicable to the geometric dimensions of the ballast tank, the dimensions of the internal structure of the ballast tank, and the draft position of the tank section;

[0008] (2) Volume: V s / V m =λ 3 , where V s — Actual ship volume, V m —Test model volume, applicable to ballast tank capacity and discharge water capacity;

[0009] (3) Flow rate: where v s — Actual ship pipeline flow rate, v m —Model pipeline flow rate, applicable to seawater pipeline, compressed air pipeline, and ventilation pipeline flow rate;

[0010] (4) Flow rate: Q s / Q m =λ 5 / 2 , where Qs — Actual ship pipeline flow rate, Q m — Model pipeline flow rate, applicable to seawater pipeline, compressed air pipeline, air breather pipeline flow rate;

[0011] (5) Pipe diameter: d s / d m = λ, where d s — Actual ship pipe diameter, d m — Test model pipe diameter, applicable to seawater pipeline, compressed air pipeline, air breather pipeline diameter;

[0012] (6) Time: where T s — Actual ship operation time, T m — Test model operation time, applicable to compressed air unloading operation time, gravity immersion operation time;

[0013] (7) Pressure: P s / P m = λ, where P s — Actual ship compressed air gauge pressure, P m — Test model compressed air gauge pressure, applicable to air compressor gauge pressure, compressed air pipeline system gauge pressure, vacuum degree.

[0014] A ship compressed air pressure unloading test system designed by the above design method, comprising ballast tanks, unloading air compressors, vacuum pumps, compressed air pipeline systems, vacuum pipeline systems, sea pipeline systems, air breather pipeline systems, automatic longitudinal and transverse inclination compensation systems, valve accessories, sensors, test control consoles containing control software; through the test system, the influence of factors such as vacuum degree, sea pipeline flow area, air breather pipeline flow area, and suction arrangement position on the system resistance characteristics of the gravity immersion process of the ballast tank can be studied; the influence of compressed air flow rate, compressed air pressure, sea pipeline flow area, compressed air pipeline flow area, and suction arrangement position on the resistance characteristics of the compressed air unloading of the ballast tank can be studied; the operation process and control strategy of the ship ballast tank compressed air pressure unloading system can be studied.

[0015] Further, the ballast tank is from a typical tank section of a ship compressed air pressure unloading system, and is realized after scaling according to the actual ship ballast tank shape, internal structure design, etc.; a draft measuring sensor is arranged on the front, back, left and right of each ballast tank, for monitoring the longitudinal and transverse inclination state of the test system during the test; an air pressure sensor and a liquid level sensor are arranged on the top of each ballast tank, for monitoring the air pressure and liquid level data in the ballast tank during the test; the liquid level sensor measurement position is located at the lowest position of the ballast tank; a bypass branch pipe and a bypass remote control valve are arranged on the air inlet branch pipe of each ballast tank, for adjusting the compressed air flow rate entering the ballast tank.

[0016] Furthermore, the ballast water discharge air compressor is used to input compressed air of a certain pressure into the ballast tank, and discharge the ballast water from the ballast tank through the sea pipeline system, thereby completing the ballast water discharge process.

[0017] Furthermore, the vacuum pump is used to suck the air in the ballast tank. Under the liquid level difference between the inside and outside of the ballast tank and the suction action of the vacuum pump, seawater is pressed into the ballast tank to accelerate the gravity immersion ballasting process; when the selected load-discharging air compressor has a vacuum function, the vacuum pump can be replaced by the load-discharging air compressor.

[0018] Furthermore, the compressed air pipeline system consists of an air compressor outlet remote control valve, a ballast tank air inlet branch remote control valve, a safety valve, a pressure sensor, a flow sensor and a pipeline, which is used to transport the compressed air generated by the unloading air compressor to the ballast tank, and can monitor the unloading air compressor outlet flow, pressure and each ballast tank branch flow and pressure data during the test; the safety valve is used to automatically open and release pressure when the compressed air pipeline system is abnormally over-pressured, thereby protecting the safety of the compressed air pipeline system equipment.

[0019] Furthermore, the ventilation pipeline system consists of ventilation remote control valves and pipelines. Each ballast tank has at least one ventilation pipeline system, and according to the requirements of the test conditions, multiple sets of ventilation pipeline systems with different diameters are set up; the sea-going pipeline system consists of sea-going remote control valves, suction ports, sea-going filter screens and pipelines. Each ballast tank has at least one sea-going pipeline system, and according to the requirements of the test conditions, multiple sets of sea-going pipeline systems with different diameters are set up.

[0020] Furthermore, the vacuum piping system is composed of a ballast tank exhaust branch pipe remote control valve and a pipeline, which is used to extract the air in the ballast tank through a vacuum pump, generate a certain vacuum degree in the ballast tank, and thus accelerate the gravity immersion process.

[0021] Furthermore, the automatic pitch and roll compensation system consists of a pitch and roll adjustment cabin, a pitch and roll adjustment pump, a remote control valve and a pipeline. By pre-installing liquid ballast or solid ballast, it helps the test system reach the designed buoyancy state. By cooperating with the pitch and roll adjustment pump and the remote control valve, the bow and stern draft of the test system are adjusted.

[0022] Furthermore, the test console containing the control software communicates signals with the load air compressor and vacuum pump control box, remote control valve, pressure sensor, flow sensor, liquid level sensor, air pressure sensor, and draft measurement sensor to realize the control, status display, alarm and other functions of the test system. At the same time, the control software has real-time data recording and output functions, which is convenient for post-test data analysis.

[0023] The beneficial effects of the present invention are:

[0024] (1) The application provides a test system scale equivalent design method. Generally, the scale of ship ballast tank is large, and it is difficult to select test site, configure equipment and build model in test system in proportion, and the economy is poor. The scale equivalent design method provided by the application moderately scales the size of the ship compressed air ballast system, the performance of the equipment, the system characteristic index, etc., as the basis for the design of the test system, so as to achieve the purpose of reducing the scale of the model test system while avoiding distortion of the test system caused by scale reduction, and ensuring that the resistance characteristic research results based on the test system can be equivalent to the ship compressed air ballast system.

[0025] (2) The application provides a test system for studying the resistance characteristics of the compressed air ballast system of the ship ballast tank. The pipeline system of the compressed air ballast system of the ballast tank is relatively complex, and the nonlinear factors such as ship lines and draft change have a great influence on the ballast characteristics, especially for ships with high requirements for ballast time. The resistance characteristics of the compressed air ballast scheme are not fully analyzed by simple estimation and simulation calculation. Therefore, on the basis of the scale equivalent of the typical tank section, the performance of the equipment, and the system characteristic index, the corresponding remote control valve, sensor, test control system, etc. are added to meet the research requirements, and a reasonable test system is established, which has important significance in verifying the performance of the compressed air ballast system of the ship and ensuring that the design operation index requirements are met. BRIEF DESCRIPTION OF DRAWINGS

[0026] Fig. 1 is a schematic diagram of a compressed air ballast test system;

[0027] Fig. 2 is a top view schematic diagram of a draft measurement sensor arrangement;

[0028] Fig. 3 is a schematic diagram of an automatic longitudinal and lateral inclination compensation system;

[0029] Fig. 4 is a compressed air ballast test control system interface;

[0030] In the figure: 1 is a vacuum pump, 2 is a ballast air compressor, 3 is a compressed air pipeline system, 4 is a breather pipeline system, 5 is a vacuum pipeline system, 6 is a sea pipeline system, 7 is an automatic longitudinal and lateral inclination compensation system, 8 is a test control console (including control software), 9 is a longitudinal and lateral inclination adjusting pump. DETAILED DESCRIPTION

[0031] The application will be further described below in conjunction with the drawings and examples.

[0032] The present invention provides a design method for a ship compressed air pressure displacement load test system, which adopts a scaled equivalence theory. According to this theory, the designer can select a typical simulation compartment based on the ship pressure displacement load design scheme, and directly obtain design parameters that can be used to build the test system by scaled equivalence.

[0033] The scaled equivalent design method for a ship ballast water displacement test system proposed in this invention is based on the preliminary design scheme of the ship ballast displacement test system. A typical simulation compartment is selected and the scale ratio λ is preliminarily determined. Based on the following equivalent theory, the relevant characteristic parameters of the actual ship ballast displacement test system are reasonably scaled:

[0034] (1) Scale: L s / L m =λ, where L s —Geometric dimensions of the actual ship, L m —Geometric dimensions of the test model. Applicable to the geometric dimensions of the ballast tank, the dimensions of the internal structure of the ballast tank, and the draft position of the tank section;

[0035] (2) Volume: V s / V m =λ 3 , where V s — Actual ship volume, V m —Test model volume. Applicable to ballast tank capacity and discharge water capacity;

[0036] (3) Flow rate: where v s — Actual ship pipeline flow rate, v m —Model pipeline flow rate. Applicable to the flow rate of seawater pipelines, compressed air pipelines, and ventilation pipelines;

[0037] (4) Flow rate: Q s / Q m =λ 5 / 2 , where Q s —Actual ship pipeline flow, Q m —Model pipeline flow rate. Applicable to seawater pipelines, compressed air pipelines, and ventilation pipeline flow rates;

[0038] (5) Pipe diameter: d s / d m =λ, where d s — Actual ship pipe diameter, d m —Test model pipe diameter. Applicable to the diameter of seawater pipelines, compressed air pipelines, and ventilation pipelines;

[0039] (6) Time: Where T s —Actual ship operation time, T m —Test model operation time. Applicable to compressed air unloading operation time and gravity immersion operation time;

[0040] (7) Pressure: P s / P m = λ, where P s - actual ship compressed air gauge pressure, P m - test model compressed air gauge pressure. Applicable to air compressor gauge pressure, compressed air pipeline system gauge pressure, vacuum degree, etc.

[0041] Based on the above equivalent scale equivalent design method, on the basis of the actual ship compressed air pressure and discharge system scheme, the size of the required typical cabin section scale model test system, the equipment configuration capacity, the pipe diameter size, the characteristic index and other parameters of the ballast cabin section can be determined.

[0042] As Figs. 1 to 4 shown, a ship compressed air pressure and discharge test system based on the ship pressure and discharge test system scale equivalent design method of the application is suitable for ships using compressed air pressure and discharge scheme. The test system includes ballast tanks, discharge air compressors, vacuum pumps, compressed air pipeline systems, vacuum pipeline systems, sea pipeline systems, air permeable pipeline systems, automatic longitudinal and transverse inclination compensation systems, valve accessories, sensors, test control consoles (including control software), etc. Among them:

[0043] 1) The ballast tank selects a typical cabin section of the ship compressed air pressure and discharge system, and is realized after scale according to the actual ship ballast tank shape, internal structure design, etc. In this embodiment, a typical cabin section (including two ballast tanks) of a ship is selected for testing.

[0044] A draft measuring sensor F5-F8 is arranged at the front, rear, left and right of the test system ballast cabin section, which is used to monitor the longitudinal and transverse inclination state of the test cabin section during the test.

[0045] An air pressure sensor F9, F11, a liquid level sensor F10, F12 is arranged at the top of each ballast tank, which is used to monitor the air pressure and liquid level data in the ballast tank during the test. The liquid level sensor should be located at the lowest position of the ballast tank as much as possible.

[0046] 2) The discharge air compressor 2 is used to input compressed air with a certain pressure into the ballast tank, to discharge the ballast water from the ballast tank through the sea pipeline system, thereby completing the ballast water discharge process.

[0047] 3) The vacuum pump 1 is used to suck the air in the ballast tank, and under the action of the liquid level difference between the inside and outside of the ballast tank and the vacuum pump suction, the seawater is pressed into the ballast tank to speed up the gravity immersion ballast process. When the selected discharge air compressor has the function of vacuum suction, the vacuum pump can be replaced by the discharge air compressor.

[0048] 4) Compressed air piping system 3 primarily consists of the compressor outlet remote control valve V1, ballast tank inlet branch pipe remote control valves V2 and V3, safety valve V14, pressure sensors F15, F16, and F17, flow sensors F13, F14, and F18, and piping. It is used to deliver compressed air generated by the load-discharging air compressor 2 to the ballast tanks. During the test, the flow rate and pressure at the load-discharging air compressor outlet, as well as the flow rate and pressure of each ballast tank branch pipe, can be measured.

[0049] Each ballast tank air inlet branch is provided with a bypass branch and bypass remote control valves V4 and V5, which can be used to adjust the flow of compressed air entering the ballast tank.

[0050] Safety valve V14 is used to automatically open and release pressure when the compressed air pipeline system is abnormally over-pressurized, thereby protecting the safety of the compressed air pipeline system.

[0051] 5) Vent piping system 4 primarily consists of remote vent valves V8, V9, V10, and V11, as well as piping. Each ballast tank typically has at least one vent piping system. Multiple vent piping systems with varying diameters may be installed as required by the test conditions.

[0052] 6) The vacuum piping system 5 mainly consists of the ballast tank exhaust branch pipe remote control valves V6 and V7 and pipelines, which are used to extract the air in the ballast tank through the vacuum pump 1, generate a certain vacuum degree in the ballast tank, and thus accelerate the gravity immersion process.

[0053] 7) The sea-access piping system 6 primarily consists of remote-controlled sea-access valves V12 and V13, suction ports F1 and F2, sea-access filters F3 and F4, and sea-access piping. Each ballast tank typically has at least one sea-access piping system. Multiple sea-access piping systems with varying diameters may be installed as required by test conditions.

[0054] 8) The automatic pitch compensation system 7 primarily consists of a pitch control cabin, a pitch control pump 9, remote control valves, and piping. Pre-installed liquid or solid ballast helps the test system achieve its designed buoyancy. The pitch control pump and remote control valves coordinate to adjust the fore and aft draft of the test system.

[0055] 9) Test console (including control software) 8, which communicates signals with the load air compressor and vacuum pump control box, remote control valve, pressure sensor, flow sensor, liquid level sensor, air pressure sensor, draft measurement sensor, etc., to realize the control, status display, alarm and other functions of the test system. At the same time, the control software has real-time data recording and output functions, which is convenient for post-test data analysis.

[0056] Based on the test system proposed by the present invention, it is possible to study the influence of factors such as vacuum degree, sea pipe flow area, air pipe flow area, and suction port layout position on the system resistance characteristics of the ballast tank gravity flooding process; the influence of factors such as compressed air flow rate, compressed air pressure, sea pipe flow area, compressed air pipe flow area, and suction port layout position on the ballast tank compressed air discharge resistance characteristics; and the operation process and control strategy of the ship ballast tank compressed air discharge system. The operating steps of a typical test condition are as follows:

[0057] (1) Preparation before the test:

[0058] First, the welding and construction of the test system compartment, sensor installation, valve accessories and piping system installation, control system wiring and debugging must be completed on site. Then the test system tightness test must be completed. Finally, the test system launching and debugging must be completed. The floating stability of the compartment must be adjusted through the longitudinal and transverse inclination adjustment systems, and the ballast status of the compartment must be adjusted to the initial design value.

[0059] (2) Typical test conditions:

[0060] A. Gravity immersion conditions (non-vacuum conditions):

[0061] First open (or confirm the open state) the vent remote control valves V8, V9, V10, and V11, and then open the bottom sea remote control valves V12 and V13. When the water volume in the ballast tank reaches 95% of the tank capacity, first close the sea remote control valves V12 and V13. After the valves are fully closed, close the vent remote control valve and the test is completed.

[0062] B. Gravity immersion condition (under vacuum conditions):

[0063] First close (or confirm the closed state) the ventilation remote control valves V8, V9, V10, and V11, then open the exhaust branch pipe remote control valves V6 and V7, and then start the vacuum pump. When the pressure in the cabin reaches a certain vacuum degree, open the bottom sea-going remote control valves V12 and V13. When the water volume in the ballast tank reaches 95% of the tank capacity, first close the sea-going remote control valves V12 and V13, then close the vacuum pump in sequence, and open the ventilation remote control valves V8, V9, V10, and V11 until the air pressure in the cabin reaches atmospheric pressure. Finally, close the exhaust branch pipe remote control valves V6 and V7, and the test process is completed.

[0064] C. Compressed air discharge working conditions:

[0065] First, close (or confirm the closed state) the vent remote control valves V8, V9, V10, and V11, then open the air compressor outlet remote control valve V1 and the ballast tank air inlet branch remote control valves V2 and V3, and then turn on the air compressor. When the pressure in the tank reaches a certain value, open the sea remote control valves V12 and V13. When the water level in the ballast tank reaches the suction height, first close the sea remote control valves V12 and V13, then stop the load-discharging air compressor, and finally open the vent remote control valves V8, V9, V10, and V11 until the air pressure in the tank reaches atmospheric pressure, and the test process is complete.

[0066] The above are only some typical test conditions. Test conditions can be increased by adding sea pipeline system pipelines, compressed air pipeline system pipelines, vent pipeline system pipelines, ballast tank compressed air flow, etc.

Claims

1. A design method for a ship compressed air pressure displacement test system, characterized by: A scaled-down equivalent design method is adopted. Based on the preliminary design scheme of the ship's ballast load, a typical simulation section is selected and the scale ratio λ is preliminarily determined. According to the equivalent theory, the relevant characteristic parameters of the actual ship's ballast load system are scaled down. Based on the scaled-down equivalent design method, the compressed air ballast load system of the typical section of the actual ship is scaled down and equivalent. The obtained ballast section size, equipment configuration capacity, pipe diameter size, and characteristic index parameters are used as the basis for building the test system. According to the equivalent theory, the scaled-down relevant characteristic parameters of the actual ship's ballast load system specifically include: (1) Scale: L s / L m =λ, where L s —Geometric dimensions of the actual ship, L m —Geometric dimensions of the test model, applicable to the geometric dimensions of the ballast tank, the dimensions of the internal structure of the ballast tank, and the draft position of the tank section; (2) Volume: V s / V m =λ 3 , where V s — Actual ship volume, V m —Test model volume, applicable to ballast tank capacity and discharge water capacity; (3) Flow rate: where v s — Actual ship pipeline flow rate, v m —Model pipeline flow rate, applicable to seawater pipeline, compressed air pipeline, and ventilation pipeline flow rate; (4) Flow rate: Q s / Q m =λ 5 / 2 , where Q s —Actual ship pipeline flow, Q m —Model pipeline flow rate, applicable to seawater pipeline, compressed air pipeline, and ventilation pipeline flow rate; (5) Pipe diameter: d s / d m =λ, where d s — Actual ship pipe diameter, d m —Test model pipe diameter, applicable to the diameter of seawater pipelines, compressed air pipelines, and ventilation pipelines; (6) Time: Where T s —Actual ship operation time, T m —Test model operation time, applicable to compressed air load removal operation time and gravity immersion operation time; (7) Pressure: P s / P m =λ, where P s — Actual ship compressed air gauge pressure, P m —Test model compressed air gauge pressure, applicable to air compressor gauge pressure, compressed air pipeline system gauge pressure and vacuum degree.

2. A ship compressed air pressure displacement test system designed using the design method of claim 1, characterized in that: The test system includes a ballast tank, a discharge air compressor, a vacuum pump, a compressed air piping system, a vacuum piping system, a sea pipe system, a vent pipe system, an automatic pitch and roll compensation system, valve accessories, sensors, and a test console with control software. Through the test system, it is possible to study the influence of factors such as vacuum degree, sea pipe flow area, vent pipe flow area, and suction port layout position on the system resistance characteristics of the ballast tank during gravity immersion; study the influence of compressed air flow, compressed air pressure, sea pipe flow area, compressed air pipe flow area, and suction port layout position on the ballast tank compressed air discharge resistance characteristics; study the operation process and control strategy of the ship ballast tank compressed air discharge system; the ballast tank is from a typical section of a ship's compressed air discharge system, and is scaled down according to the actual ship's ballast tank shape and internal structure design; a draft measurement sensor is set at the front, back, left, and right of the ballast tank section to monitor the pitch and roll status of the test system during the test; An air pressure sensor and a liquid level sensor are set on the top of each ballast tank to monitor the air pressure and liquid level data in the ballast tank during the test; the liquid level sensor measurement position is at the lowest point of the ballast tank; a bypass branch pipe and a bypass remote control valve are set on the air intake branch pipe of each ballast tank to adjust the flow of compressed air entering the ballast tank; the automatic pitch and roll compensation system consists of a pitch and roll adjustment cabin, a pitch and roll adjustment pump, a remote control valve and a pipeline. By pre-installing liquid ballast or solid ballast, the test system is helped to reach the designed buoyancy state, and the bow and stern draft of the test system are adjusted by the pitch and roll adjustment pump and the remote control valve; the test console containing control software communicates signals with the load-discharging air compressor and vacuum pump control box, remote control valve, pressure sensor, flow sensor, liquid level sensor, air pressure sensor, and draft measurement sensor to realize the control, status display, alarm and other functions of the test system. At the same time, the control software has real-time data recording and output functions, which is convenient for post-test data analysis.

3. The ship compressed air pressure displacement test system according to claim 2, characterized in that: The ballast water discharge air compressor is used to input compressed air of a certain pressure into the ballast tank, and discharge the ballast water from the ballast tank through the sea pipeline system, thereby completing the ballast water discharge process.

4. The ship compressed air pressure displacement test system according to claim 2, characterized in that: The vacuum pump is used to suck the air in the ballast tank. Under the liquid level difference between the inside and outside of the ballast tank and the suction action of the vacuum pump, seawater is pressed into the ballast tank to accelerate the gravity immersion ballasting process; when the selected load-discharging air compressor has a vacuum function, the vacuum pump can be replaced by the load-discharging air compressor.

5. The ship compressed air pressure displacement test system according to claim 2, characterized in that: The compressed air pipeline system consists of an air compressor outlet remote control valve, a ballast tank air inlet branch remote control valve, a safety valve, a pressure sensor, a flow sensor and a pipeline, which is used to transport the compressed air generated by the unloading air compressor to the ballast tank, and can monitor the unloading air compressor outlet flow, pressure and each ballast tank branch flow and pressure data during the test; the safety valve is used to automatically open and release pressure when the compressed air pipeline system is abnormally over-pressurized, thereby protecting the safety of the compressed air pipeline system equipment.

6. The ship compressed air pressure displacement test system according to claim 2, characterized in that: The vent pipe system consists of a vent remote control valve and pipelines. Each ballast tank has at least one vent pipe system, and according to the requirements of the test conditions, multiple sets of vent pipe systems with different diameters are set up; the sea-going pipeline system consists of a sea-going remote control valve, a suction port, a sea-going port filter and pipelines. Each ballast tank has at least one sea-going pipeline system, and according to the requirements of the test conditions, multiple sets of sea-going pipeline systems with different diameters are set up.

7. The ship compressed air pressure displacement test system according to claim 2, characterized in that: The vacuum piping system consists of a ballast tank exhaust branch pipe remote control valve and a pipeline, which is used to extract the air in the ballast tank through a vacuum pump, generate a certain vacuum degree in the ballast tank, and thus accelerate the gravity immersion process.

Images