A pressure pipe hydrostatic testing system and method

Abstract

This invention provides a hydraulic testing system and method for pressure pipelines. The hydraulic testing system comprises: a drive air circuit module, a medium circuit module, a drain circuit module, a pressure relief circuit module, a purging circuit module, an exhaust circuit module, and a testing module. The drive air circuit module is connected to the medium circuit module via a booster pump. The drive air circuit module is also connected to the purging circuit module. The inlet and outlet ends of the booster pump are connected to the medium circuit module, respectively. The drain circuit module and the pressure relief circuit module are connected in parallel downstream of the medium circuit module. The outlet end of the medium circuit module is connected to the test specimen via a transfer pipe. The exhaust circuit module is connected to an instrument interface on the test specimen. This testing system can independently provide air and water sources, and can also provide external air and water sources, providing matching testing requirements for different test specimens. Furthermore, the testing system has a simple structure, is portable, and allows for inspection and purging operations on the test specimen.

Description

Technical Field

[0001] This invention relates to the field of pipeline pressure testing technology, specifically to a hydraulic testing system and method for pressure pipelines. Background Technology

[0002] Pipelines are devices used to achieve functions such as conveying, distributing, mixing, separating, discharging, metering, controlling, and stopping fluid flow. Pressure pipelines refer to all pipelines that withstand internal or external pressure. During the manufacturing process, quality inspection is carried out, and the corresponding hydraulic test is an important quality inspection item for pressure pipelines.

[0003] Currently, manual test pumps are generally used for small-batch, intermittent hydraulic tests. The disadvantages of this method are that it is labor-intensive, time-consuming, and cannot be automatically controlled. It also cannot meet the testing requirements of large-volume pipelines.

[0004] Meanwhile, for large-scale, high-frequency hydraulic tests, booster pumps are generally used. The disadvantage of this method is that the site is fixed and requires the supply of external atmospheric pressure driving air and external water.

[0005] In addition, for some special pressure pipelines that have requirements for cleanliness and water content, the above methods still require the construction of new equipment for related work, which is an extreme waste of human and material resources.

[0006] Therefore, those skilled in the art urgently need a hydraulic testing system that can meet different testing needs, is automatically controlled, has gas and liquid supply, and does not require a fixed site. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide a hydraulic testing system and method for pressure pipelines, so as to solve the problems of low test adaptability, need for external atmospheric pressure driving air and external water supply, fixed site, and inability to meet the test requirements of special pressure pipelines in the prior art.

[0008] This invention provides a hydraulic testing system for pressure pipelines. The hydraulic testing system includes: a drive air circuit module, a medium circuit module, a drain circuit module, a pressure relief circuit module, a purging circuit module, an exhaust circuit module, and a testing module. The drive air circuit module is connected to the medium circuit module via a booster pump. The drive air circuit module is also connected to the purging circuit module for purging the test specimen. The inlet and outlet ends of the booster pump are respectively connected to the medium circuit module for pressurizing it. The drain circuit module and the pressure relief circuit module are connected in parallel downstream of the medium circuit module. The outlet end of the media path module is connected to the test specimen via a transfer pipe; the exhaust path module is connected to the instrument interface on the test specimen for discharging gas from inside the pipe; the detection module is used to detect the dew point value inside the test specimen; the driving gas path module has a driving gas cylinder and a driving gas inlet, respectively for providing different volumes of driving gas; the media path module has a water tank and a driving gas inlet, respectively for providing different volumes of water; the purging path module has a purging interface connected to the test specimen; the detection module has a dew point meter for detecting the dew point value inside the test specimen.

[0009] Furthermore, the drive air circuit module also includes a drive air circuit, a filter regulating valve, and a speed control valve, wherein the drive air cylinder and the drive air inlet are both located at the upstream port of the drive air circuit; the speed control valve is located at the downstream port of the drive air circuit; the filter regulating valve is located at the drive air circuit between the drive air cylinder and the speed control valve; and the downstream port of the drive air circuit is connected to the booster pump.

[0010] Furthermore, the purging module also includes a purging pipeline and a third shut-off valve, wherein the upstream end of the purging pipeline is connected to the drive air line between the filter regulating valve and the speed regulating valve; the downstream end of the purging pipeline is provided with the purging interface for connecting the test piece through a pipeline to perform purging operations; the third shut-off valve is provided on the purging pipeline for controlling the on / off of purging air output to the test piece.

[0011] Furthermore, the media path module also includes a media pipeline, a filter, a first shut-off valve, a check valve, a second shut-off valve, and a safety valve. The water tank and the driving air inlet are both located at the upstream port of the media pipeline. Along the media flow direction, the filter, the first shut-off valve, the check valve, the second shut-off valve, and the safety valve are sequentially arranged on the media pipeline. The inlet and outlet of the booster pump are connected to the media pipeline between the first shut-off valve and the check valve. A media outlet is located at the downstream port of the media pipeline, connected to the upstream port of the transfer pipeline, and the downstream port of the transfer pipeline is connected to the test specimen.

[0012] Furthermore, the drainage module includes a drainage pipe and a drainage valve, wherein the upstream port of the drainage pipe is connected to the medium pipeline between the booster pump and the check valve; the drainage valve is disposed on the drainage pipe for controlling the opening and closing of the pipeline.

[0013] Furthermore, the pressure relief module includes a pressure relief pipeline and a pressure relief valve, wherein the upstream port of the pressure relief pipeline is connected to the medium pipeline between the second shut-off valve and the safety valve; the pressure relief valve is disposed on the pressure relief pipeline and is used to control the opening and closing of the pipeline.

[0014] Furthermore, the exhaust module includes an exhaust pipe and an exhaust valve, wherein the upstream port of the exhaust pipe is connected to the instrument interface on the test piece and communicates with the inside of the pipe of the test piece, and the downstream port of the exhaust pipe is connected to the atmosphere; the exhaust valve is disposed on the exhaust pipe and is used to control the opening and closing of the pipe.

[0015] This invention provides a hydraulic testing method for pressure pipelines, employing the aforementioned hydraulic testing system. The testing method includes:

[0016] Step S1 Experimental Preparation: Connect the test specimen to the medium pipeline through the transfer pipeline, and determine the type of gas source and water source to be used;

[0017] Step S2: Filling and venting the test system: Open the valves on the medium pipeline, drain pipeline, pressure relief pipeline and venting pipeline, and fill the system with water through an external water source or water tank until liquid comes out of the downstream port of the venting pipeline. Then close the valves on the drain pipeline, pressure relief pipeline and venting pipeline.

[0018] Step S3: Start the test: Open the filter regulating valve, adjust the speed control valve and the booster pump. When the test pressure reaches the initial set value, maintain the pressure and check for system leaks. If the system leaks, stop the test and handle the issue. If there are no leaks, continue to increase the pressure to the next pressure value and repeat the pressure holding test and leak detection until all leak tests at the preset pressures are completed.

[0019] Step S4: Stop the test: Close the filter regulating valve and the booster pump, open the valve on the purge line to release pressure; close the first shut-off valve, open the valves on the pressure relief line and the drain line to release and discharge the medium, and close the second shut-off valve.

[0020] Step S5: Purge and dew point test: Connect the purging interface at the downstream port of the purging pipeline to the front port of the test piece for purging, and connect the first dew point test interface to the second dew point test interface on the test piece for dew point test.

[0021] Furthermore, step S3, which involves starting the experiment, specifically includes:

[0022] Step S31: Open the filter regulating valve and adjust the driving pressure to the design requirement value;

[0023] Step S32: Adjust the speed control valve to control the start-up rate and pressurization rate of the booster pump;

[0024] Step S33: Observe the pressure gauge on the medium pipeline. When the pressure reaches 0.3 times, 0.5 times, 0.7 times, or 1.0 times the test pressure, maintain the pressure for the set time and check for any leaks in the system.

[0025] Step S34: If a leak is found, stop the test and take action; if there is no leak, continue to pressurize to the next stage and perform a pressure holding check.

[0026] Furthermore, step S5, the purging and dew point detection steps, specifically include:

[0027] Step S51: Connect the blow-off port to the front port of the test piece using a pipe fitting;

[0028] Step S52: Connect the first dew point inspection port and the second dew point inspection port using a pipe fitting;

[0029] Step S53: Remove the plug or flange cover from the downstream port of the test specimen;

[0030] Step S54: Close the speed control valve, open the filter regulating valve, and adjust the pressure to the purging set value;

[0031] Step S55: Open the third shut-off valve to purge the test specimen until the dew point meter reading drops to the system set value, complete the cleaning of excess material from the test specimen and the dew point check, and close the filter regulating valve.

[0032] As can be seen from the above embodiments, the hydraulic testing system and method for pressure pipelines provided by the present invention have at least the following advantages:

[0033] 1. Dual-mode design of the driving air circuit: This system, with its built-in driving air cylinder, is suitable for hydraulic testing of small-batch, intermittent, and small-volume pressure pipelines; by connecting an external air source through the driving air inlet, it can meet the hydraulic testing needs of large-batch, high-frequency, and large-volume pressure pipelines, and can also refill the driving air cylinder. The pressure and flow rate of the driving air are adjustable, thereby adjusting the pressurization rate of the booster pump, making it suitable for pressure pipelines of different volumes.

[0034] 2. Dual-mode design of medium pipeline: With its own water tank, it is suitable for hydraulic testing of small batches, intermittent, and small-volume pressure pipelines in outdoor sites; with the medium inlet connected to an external water source, it can meet the hydraulic testing needs of large batches, high-frequency, and large-volume pressure pipelines.

[0035] 3. Blow-out and dew point detection functions: Through the reserved interface of the blow-out pipeline, the test specimen pipeline can be blown out to remove excess material and moisture; through the reserved interface of the dew point meter, the dew point of the test specimen pipeline can be checked to control the water content.

[0036] 4. Safety control sequence: The safety of the test process can be controlled by switching the drain line, pressure relief line, and exhaust line during the test. Automatic control can also be achieved.

[0037] This system and method can meet the hydraulic testing needs of pressure pipelines of different volumes, locations, and batches. At the same time, it can remove excess material and water content in the test pipeline and check the dew point, which greatly shortens the test time and saves labor costs.

[0038] It should be understood that the above general description and the following specific embodiments are merely exemplary and illustrative, and do not limit the scope of the invention. Attached Figure Description

[0039] The accompanying drawings, which are part of the specification of this invention, illustrate exemplary embodiments of the invention. The drawings, together with the description in the specification, serve to illustrate the principles of the invention.

[0040] Figure 1 This invention provides a schematic diagram of the pipeline connection for a pressure pipeline hydraulic testing system.

[0041] Explanation of reference numerals in the attached figures:

[0042] A1-Drive air circuit, A2-Medium pipeline, A3-Drainage pipeline, A4-Pressure relief pipeline, A5-Purge pipeline, A6-Transfer pipeline, A7-Exhaust pipeline, A8-Test piece;

[0043] J1-Drive air inlet, J2-Medium inlet, J3-Purge port, J4-First dew point check port, J5-Medium outlet, J6-Test specimen front port, J7-Second dew point check port, J8-Test specimen end port;

[0044] S1 - Booster pump;

[0045] V1 - Drive gas cylinder, PR1 - Filter regulating valve, SCV1 - Speed ​​control valve;

[0046] T1 - Water tank, PF1 - Filter, SOV1 - First shut-off valve, CV1 - Check valve, SOV2 - Second shut-off valve, PSV1 - Safety valve, PG - Pressure gauge;

[0047] SOV3 - Third shut-off valve; DT - Dew point meter;

[0048] PRV1 - Drain valve; PRV2 - Pressure relief valve; PRV3 - Air vent valve. Detailed Implementation

[0049] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as a limitation of the present invention, but rather as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0050] Various modifications and variations can be made to the specific embodiments described in this specification without departing from the scope or spirit of the invention, as will be apparent to those skilled in the art. Other embodiments derived from this specification will also be obvious to those skilled in the art. This application specification and embodiments are merely exemplary.

[0051] This invention provides a hydraulic testing system for pressure pipelines, such as... Figure 1 The diagram shows the piping connections of the hydraulic testing system. In a specific embodiment, the hydraulic testing system includes: a drive air circuit module, a medium circuit module, a drain circuit module, a pressure relief circuit module, a purging circuit module, an exhaust circuit module, and a testing module. The drive air circuit module is connected to the medium circuit module via a booster pump S1. The drive air circuit module is connected to the drive air inlet of the booster pump S1 and is used to provide pressurized gas to the booster pump.

[0052] The drive air circuit module is connected to the purging air circuit module and is used to purge and clean the test piece A8 through the purging air circuit module.

[0053] The inlet and outlet ends of the booster pump S1 are connected to the medium path module, respectively, to pressurize the medium in the medium path module so that the medium in the pipeline reaches the test pressure.

[0054] Downstream of the medium path module are a drain path module and a pressure relief path module connected in parallel, which are used to depressurize and drain the system pipeline after the test.

[0055] The outlet end of the medium path module is connected to test piece A8 via transfer pipe A6, which is used to provide test medium to the pipeline of test piece A8.

[0056] The venting module connects to the instrument interfaces on test piece A8 to expel gas from the pipe during water filling. Test piece A8 pipe is designed and manufactured with several pre-installed instrument interfaces on the pipe wall for connecting thermometers or pressure gauges. During pressure testing, test pipes and equipment are often connected to these interfaces, such as connecting the venting module and the dew point detection interface. The remaining instrument interfaces need to be sealed with plugs.

[0057] The driving gas circuit module has a driving gas cylinder V1 and a driving gas inlet J1, which are used to provide driving gas of different volumes. In this embodiment, the driving gas cylinder V1 is used to provide the gas source for driving the pump during small-batch, intermittent, and small-volume pipeline tests. The driving gas inlet J1 is used to provide the gas source for driving the pump during large-batch, high-frequency, and large-volume pressure pipeline tests, and can also fill the driving gas cylinder V1.

[0058] The media circuit module has a water tank T1 and a driving air inlet J2, which are used to provide water sources of different volumes. In this embodiment, the water tank T1 is used to provide water for small-batch, intermittent, small-volume pipeline tests. The media inlet J2 is used to provide water for large-batch, high-frequency, large-volume pressure pipeline tests, and the media inlet J2 can also fill the water tank T1 with water.

[0059] The blow-off path module has a blow-off interface J3 for connecting test piece A8.

[0060] The detection module is used to detect the dew point (water content) inside test piece A8. The detection module has a dew point meter DT for detecting the dew point value inside test piece A8, a first dew point inspection interface J4, and a second dew point inspection interface J7. The second dew point inspection interface J7 is an instrument interface located on test piece A8 and is connected to the first dew point inspection interface J4, which is connected to the dew point meter DT, via a conduit.

[0061] In a specific embodiment of the present invention, the drive air circuit module further includes a drive air circuit A1, a filter regulating valve PR1, and a speed regulating valve SCV1. The drive air cylinder V1 and the drive air inlet J1 are both located upstream of the drive air circuit A1. The drive air inlet J1 is used to connect to an external air source, providing a stable external air supply to the system.

[0062] The downstream port of the drive air circuit A1 is connected to the booster pump S1.

[0063] The speed control valve SCV1 is located downstream of the drive air circuit A1 and is used to regulate the airflow speed in the drive air circuit A1. The speed control valve SCV1 is also used to regulate the pressurization rate of the booster pump S1, and can also be used as a shut-off valve.

[0064] The filter regulating valve PR1 is installed on the drive air circuit A1 between the drive gas cylinder V1 and the speed regulating valve SCV1. It is used to filter the gas fluid in the drive air circuit A1 and at the same time provide a stable pressure drive air source for the booster pump S1.

[0065] In a specific embodiment of the present invention, the purging path module further includes a purging pipeline A5 and a third shut-off valve SOV3. The upstream end of the purging pipeline A5 is connected to the drive air path A1 between the filter regulating valve PR1 and the speed regulating valve SCV1.

[0066] A purging interface J3 is installed at the downstream port of purging pipeline A5, which is used to connect to test specimen A8 for purging operations. After the hydraulic test is completed, test specimen A8 is purged to remove excess material and moisture from the inside of the pipeline of test specimen A8.

[0067] The third shut-off valve SOV3 is installed on the purging line A5 to control the flow of purging gas to the test piece A8, and can also be used to release pressure when the pump is stopped.

[0068] In a specific embodiment of the present invention, the media path module further includes a media pipeline A2, a filter PF1, a first shut-off valve SOV1, a one-way valve CV1, a second shut-off valve SOV2, and a safety valve PSV1. The water tank T1 and the driving air inlet J2 are both located at the upstream port of the media pipeline A2. The driving air inlet J2 is used to connect to an external media, providing a stable external media supply to the system.

[0069] Along the direction of media flow, a filter PF1, a first shut-off valve SOV1, a check valve CV1, a second shut-off valve SOV2, and a safety valve PSV1 are sequentially installed on media pipeline A2. Filter PF1 filters the fluid in media pipeline A2. The first shut-off valve SOV1 controls the opening and closing state of media pipeline A2. The check valve CV1 prevents the media from flowing back to the booster pump S1 when the pump stops. The second shut-off valve SOV2 controls the supply of media to test piece A8. The safety valve PSV1 ensures automatic pressure relief in case of overpressure in the test system, guaranteeing system safety.

[0070] The inlet and outlet of the booster pump S1 are connected to the medium pipeline A2 between the first shut-off valve SOV1 and the check valve CV1. The medium in the medium pipeline A2 enters from the inlet of the booster pump S1, and after being pressurized, flows out from the outlet of the booster pump S1 to the downstream of the medium pipeline A2, thereby providing the test pressurized medium for the test piece A8.

[0071] The downstream port of the medium pipeline A2 is equipped with a medium output port J5, which is connected to the upstream port of the transfer pipeline A6. The downstream port of the transfer pipeline A6 is connected to the front port J6 of the test piece A8.

[0072] In this embodiment, a pressure gauge PG is installed on the medium pipeline A2 between the second shut-off valve SOV2 and the safety valve PSV1 to monitor the medium pressure inside the system pipeline in real time during the test.

[0073] In a specific embodiment of the present invention, the drainage module includes a drainage pipe A3 and a drainage valve PRV1. The upstream port of the drainage pipe A3 is connected to the media pipe A2 between the booster pump S1 and the check valve CV1. The downstream port of the drainage pipe A3 is connected to a liquid collection container.

[0074] The drain valve PRV1 is installed on the drain line A3 to control the opening and closing of the line and to drain the medium in the system line after the test.

[0075] In a specific embodiment of the present invention, the pressure relief module includes a pressure relief pipeline A4 and a pressure relief valve PRV2. The upstream port of the pressure relief pipeline A4 is connected to the medium pipeline A2 between the second shut-off valve SOV2 and the safety valve PSV1. The downstream port of the pressure relief pipeline A4 is open to the atmosphere.

[0076] The pressure relief valve PRV2 is installed on the pressure relief pipeline A4 to control the opening and closing of the pipeline and to relieve pressure on the test system after the test.

[0077] In a specific embodiment of the present invention, the exhaust path module includes an exhaust pipe A7 and an exhaust valve PRV3. The upstream port of the exhaust pipe A7 is connected to an instrument interface on the test piece A8 and communicates with the interior of the pipes in the test piece A8. The downstream port of the exhaust pipe A7 is open to the atmosphere. Specifically, the exhaust port of the downstream port of the exhaust pipe A7 is located at the highest point of the test piece.

[0078] The exhaust valve PRV3 is located on the exhaust pipe A7 and is used to control the opening and closing of the pipe to release gas from the system before the test, thereby reducing the risk of pressure rise.

[0079] A second dew point check interface J7 is provided on the test piece A8 between the upstream port of the exhaust pipe A7 and the downstream port of the test piece A8, for connection with the first dew point check interface J4.

[0080] The downstream port of test specimen A8 is test specimen end port J8, which is equipped with a sealing structure. Preferably, the sealing structure is a plug or a flange cover.

[0081] This invention provides a hydraulic testing method for pressure pipelines, the testing method comprising:

[0082] Step S1 Experimental Preparation: Connect test piece A8 to medium pipeline A2 via adapter pipe A6, and determine the type of gas and water source to be used. Specifically, first, assemble and connect the pressure pipeline to be tested to medium pipeline A2 using adapter pipe section A6. Then, based on the specifications of test piece A8, confirm whether the driving gas is supplied by driving gas cylinder V1 or by an external gas source connected to the driving gas inlet J1. Finally, based on the specifications of test piece A8, confirm whether the test water is supplied by water tank T1 or by an external water source connected to the medium inlet J2.

[0083] Step S2: Water Filling and Air Venting of the Test System: Open the valves on the medium pipeline A2, drain pipeline A3, pressure relief pipeline A4, and air vent pipeline A7, and fill the system with water using an external water source or water tank T1 until liquid exits from the downstream port of the air vent pipeline A7. Then close the valves on the drain pipeline A3, pressure relief pipeline A4, and air vent pipeline A7. Specifically, open the second shut-off valve SOV2 on the medium pipeline A2, the drain valve PRV1 on the drain pipeline A3, the pressure relief valve PRV2 on the pressure relief pipeline A4, and the air vent valve PRV3 on the air vent pipeline A7. Then open the first shut-off valve SOV1 on the medium pipeline A2 to fill the system with water. After liquid exits from the vent port at the downstream end of the air vent pipeline A7, close the drain valve PRV1, pressure relief valve PRV2, and air vent valve PRV3 in sequence. The water filling process is now complete.

[0084] Step S3: Begin the test: Open the filter regulating valve PR1, adjust the speed regulating valve SCV1 and the booster pump S1. When the test pressure reaches the initial set value, maintain the pressure and check for leaks in the system. If a leak is found, stop the test and address the issue. If no leak is found, continue increasing the pressure to the next value and repeat the pressure holding test and leak detection until all leak tests at the preset pressures are completed.

[0085] Step S4: Stop the test: Close the filter regulating valve PR1 and the booster pump S1, and open the valve on the purge line A5 to release pressure. Close the first shut-off valve SOV1, open the valves on the pressure relief line A4 and the drain line A3 to release and discharge the medium, and close the second shut-off valve SOV2. Specifically, after the test, first close the filter regulating valve PR1, open the shut-off valve SOV3 to complete the release and pressure relief of the driving gas, and then close the booster pump S1. Then close the first shut-off valve SOV1, open the pressure relief valve PRV2 to complete the release and discharge of the medium in the test system. Finally, open the drain valve PRV1 to complete the discharge of the medium from the integrated pressurization equipment system, and close the second shut-off valve SOV2.

[0086] Step S5: Purge and dew point test: Connect the purging interface J3 at the downstream port of the purging pipeline A5 to the front port of the test piece A8DE for purging, and connect the first dew point test interface J4 to the second dew point test interface J7 on the test piece A8 for dew point test.

[0087] In a specific embodiment of the present invention, step S3, starting the experiment, specifically includes:

[0088] Step S31: Open the filter regulating valve PR1 and adjust the driving pressure to the design requirement value.

[0089] Step S32: Adjust the speed control valve SCV1 to control the start-up rate and pressurization rate of the booster pump S1.

[0090] Step S33: Observe the pressure gauge PG on the medium pipeline A2. When the pressure reaches 0.3 times, 0.5 times, 0.7 times, or 1.0 times the test pressure, maintain the pressure for the set time respectively and check for any leaks in the system.

[0091] Step S34: If a leak is found, stop the test and take corrective action; if there is no leak, continue pressurizing to the next stage and perform a pressure holding check. Specifically, when the pressure reaches 0.3 times the test pressure, if no leak occurs during the pressure holding process, increase the pressure to 0.5 times the test pressure and perform pressure holding and checks, and so on, until the pressure reaches 1 times the test pressure and there is no leak.

[0092] In a specific embodiment of the present invention, step S5, purging and dew point detection, specifically includes:

[0093] Step S51: Connect the blow-out port J3 to the front port J6 of the test piece through a pipe fitting, and blow out the medium in the test piece A8 through the driving gas in the driving gas circuit A1.

[0094] Step S52: Connect the first dew point inspection interface J4 and the second dew point inspection interface J7 through a pipe fitting, so as to perform dew point detection on the inside of the pipe of test piece A8 by using a dew point meter DT.

[0095] Step S53: Remove the plug or flange cover on the downstream port of test piece A8. Specifically, in order to perform a pressure test on the pipeline of test piece A8, it is necessary to seal the end port J8 of test piece A8 using a sealing structure. After the test, the sealing structure needs to be removed, and the inside of the pipeline needs to be purged.

[0096] Step S54: Close the speed control valve SCV1, open the filter regulating valve PR1, and adjust the pressure to the purging set value.

[0097] Step S55: Open the third shut-off valve SOV3 to purge the test piece A8 until the value of the dew point meter DT drops to the system set value, complete the cleaning of excess material inside the pipe of test piece A8 and the dew point check, and close the filter regulating valve PR1.

[0098] This hydraulic testing system for pressure pipelines can achieve stepless adjustment of the pressurization rate by regulating the pressure and flow rate of the driving gas, adapting to the testing needs of pipelines with different volumes. The system comes with its own driving gas cylinder and water tank, allowing for independent use, while also supporting external gas and water sources to suit different sites and batch requirements. For example, this application can achieve automated control of the testing process via PLC or industrial computer, including automatic pressurization, pressure holding, pressure release, and data recording. Further optimization based on the above operating logic enables one-button operation, automatically completing the entire process of water filling and venting, graded pressurization, pressure holding detection, pressure release, purging, and dew point checking.

[0099] The above description is merely an illustrative embodiment of the present invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A hydraulic testing system for pressure pipelines, characterized in that, The hydraulic testing system includes: a drive air circuit module, a medium circuit module, a drain circuit module, a pressure relief circuit module, a purging circuit module, an exhaust circuit module, and a testing module. The drive air circuit module is connected to the medium circuit module via a booster pump (S1); The drive air circuit module is connected to the purging circuit module and is used to purge the test piece (A8); The inlet and outlet ends of the booster pump (S1) are respectively connected to the medium path module and are used to boost the pressure of the medium path module; The downstream of the medium path module is connected in parallel to the drain path module and the pressure relief path module; The outlet end of the medium path module is connected to the test piece (A8) via a transfer pipe (A6). The exhaust module is connected to the instrument interface on the test piece (A8) and is used to exhaust the gas inside the pipe; The detection module is used to detect the dew point value inside the test piece (A8); The driving gas circuit module has a driving gas cylinder (V1) and a driving gas inlet (J1), which are used to provide driving gas of different volumes respectively; The medium path module has a water tank (T1) and a driving air inlet (J2), which are used to provide water sources of different volumes; The purging path module has a purging interface (J3) for connecting the test specimen (A8); The detection module has a dew point meter (DT) for detecting the internal dew point value of the test specimen (A8).

2. The hydraulic testing system for pressure pipelines according to claim 1, characterized in that, The drive air circuit module also includes a drive air circuit (A1), a filter regulating valve (PR1), and a speed control valve (SCV1), wherein, The driving gas cylinder (V1) and the driving gas inlet (J1) are both located at the upstream port of the driving gas path (A1); The speed control valve (SCV1) is located downstream of the drive air passage (A1); The filter regulating valve (PR1) is located on the drive air passage (A1) between the drive gas cylinder (V1) and the speed regulating valve (SCV1); The downstream port of the drive air passage (A1) is connected to the booster pump (S1).

3. The hydraulic testing system for pressure pipelines according to claim 2, characterized in that, The purging module also includes a purging line (A5) and a third shut-off valve (SOV3), wherein, The upstream end of the purge line (A5) is connected to the drive air line (A1) between the filter regulating valve (PR1) and the speed control valve (SCV1); The downstream end of the purging pipeline (A5) is provided with the purging interface (J3) for connecting the test specimen (A8) through the pipeline to perform the purging operation; The third shut-off valve (SOV3) is installed on the purging line (A5) and is used to control the on / off of the purging gas output to the test piece (A8).

4. The hydraulic testing system for pressure pipelines according to claim 1, characterized in that, The media path module also includes a media pipeline (A2), a filter (PF1), a first shut-off valve (SOV1), a one-way valve (CV1), a second shut-off valve (SOV2), and a safety valve (PSV1), wherein, The water tank (T1) and the driving air inlet (J2) are both located at the upstream port of the medium pipeline (A2); Along the direction of medium flow, the filter (PF1), the first shut-off valve (SOV1), the one-way valve (CV1), the second shut-off valve (SOV2) and the safety valve (PSV1) are sequentially installed on the medium pipeline (A2). The inlet and outlet of the booster pump (S1) are connected to the medium pipeline (A2) between the first shut-off valve (SOV1) and the check valve (CV1); The downstream port of the medium pipeline (A2) is provided with a medium output port (J5), which is connected to the upstream port of the transfer pipeline (A6), and the downstream port of the transfer pipeline (A6) is connected to the test piece (A8).

5. The hydraulic testing system for pressure pipelines according to claim 4, characterized in that, The drainage module includes a drainage pipe (A3) and a drainage valve (PRV1), wherein, The upstream port of the drain line (A3) is connected to the medium line (A2) between the booster pump (S1) and the check valve (CV1); The drain valve (PRV1) is installed on the drain pipeline (A3) and is used to control the opening and closing of the pipeline.

6. The hydraulic testing system for pressure pipelines according to claim 4, characterized in that, The pressure relief module includes a pressure relief pipe (A4) and a pressure relief valve (PRV2), wherein, The upstream port of the pressure relief line (A4) is connected to the medium line (A2) between the second shut-off valve (SOV2) and the safety valve (PSV1); The pressure relief valve (PRV2) is installed on the pressure relief pipeline (A4) and is used to control the opening and closing of the pipeline.

7. The hydraulic testing system for pressure pipelines according to claim 1, characterized in that, The exhaust module includes an exhaust pipe (A7) and an exhaust valve (PRV3), wherein, The upstream port of the exhaust pipe (A7) is connected to the instrument interface on the test piece (A8) and communicates with the inside of the pipe of the test piece (A8), while the downstream port of the exhaust pipe (A7) is connected to the atmosphere; The exhaust valve (PRV3) is installed on the exhaust pipe (A7) and is used to control the opening and closing of the pipe.

8. A hydraulic testing method for pressure pipelines, employing the hydraulic testing system described in any one of claims 1-7, characterized in that, The experimental method includes: Step S1 Experimental Preparation: Connect the test specimen to the medium pipeline through the transfer pipeline, and determine the type of gas source and water source to be used; Step S2: Filling and venting the test system: Open the valves on the medium pipeline, drain pipeline, pressure relief pipeline and venting pipeline, and fill the system with water through an external water source or water tank until liquid comes out of the downstream port of the venting pipeline. Then close the valves on the drain pipeline, pressure relief pipeline and venting pipeline. Step S3: Start the test: Open the filter regulating valve, adjust the speed control valve and the booster pump. When the test pressure reaches the initial set value, maintain the pressure and check for system leaks. If the system leaks, stop the test and handle the issue. If there are no leaks, continue to increase the pressure to the next pressure value and repeat the pressure holding test and leak detection until all leak tests at the preset pressures are completed. Step S4: Stop the test: Close the filter regulating valve and the booster pump, open the valve on the purge line to release pressure; close the first shut-off valve, open the valves on the pressure relief line and the drain line to release and discharge the medium, and close the second shut-off valve. Step S5: Purge and dew point test: Connect the purging interface at the downstream port of the purging pipeline to the front port of the test piece for purging, and connect the first dew point test interface to the second dew point test interface on the test piece for dew point test.

9. The hydraulic testing method for pressure pipelines according to claim 8, characterized in that, Step S3, the steps to begin the experiment, specifically include: Step S31: Open the filter regulating valve and adjust the driving pressure to the design requirement value; Step S32: Adjust the speed control valve to control the start-up rate and pressurization rate of the booster pump; Step S33: Observe the pressure gauge on the medium pipeline. When the pressure reaches 0.3 times, 0.5 times, 0.7 times, or 1.0 times the test pressure, maintain the pressure for the set time and check for any leaks in the system. Step S34: If a leak is found, stop the test and take action; if there is no leak, continue to pressurize to the next stage and perform a pressure holding check.

10. The hydraulic testing method for pressure pipelines according to claim 8, characterized in that, Step S5, purging and dew point detection, specifically includes: Step S51: Connect the blow-off port to the front port of the test piece using a pipe fitting; Step S52: Connect the first dew point inspection port and the second dew point inspection port using a pipe fitting; Step S53: Remove the plug or flange cover from the downstream port of the test specimen; Step S54: Close the speed control valve, open the filter regulating valve, and adjust the pressure to the purging set value; Step S55: Open the third shut-off valve to purge the test specimen until the dew point meter reading drops to the system set value, complete the cleaning of excess material from the test specimen and the dew point check, and close the filter regulating valve.

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