Water pressure testing method for GRP pipeline joint

Abstract

The invention relates to the field of GRP pipeline joint testing, in particular to a GRP pipeline joint water pressure testing method, which comprises the following steps of S1, checking whether joints of two adjacent pipelines to be subjected to pressure testing are well connected or not; s2, sealing the joint of the two adjacent pipelines to be subjected to pressure test by using an air bag, wherein the joint of the two adjacent pipelines to be subjected to pressure test is surrounded by the pressure test space; s3, injecting water into the pressure test space until the pressure in the pressure test space reaches the test pressure, and then stabilizing the pressure; s4, observing whether the pressure drop in the pressure test space is in an allowable range or not, and if so, entering the next step; if the pressure drop exceeds the allowable range, the steps S1 to S3 are repeated after the joint is repaired until the pressure drop is within the allowable range; and S5, moving to the next test point, and repeating the steps S1 to S4 until the joint water pressure test of all the pipelines to be subjected to pressure test is completed. According to the method, only the local space at the joint of the two adjacent pipelines to be subjected to pressure test needs to be subjected to water filling and pressing, the water consumption is greatly reduced, the working efficiency is improved, and the progress of the whole project is accelerated.

Description

Technical Field

[0001] The invention relates to the field of GRP pipe joint testing, and in particular to a GRP pipe joint water pressure testing method. Background Art

[0002] GRP pipes (GRP pipes, also known as polyester FRP pipes) are widely used in coastal projects due to their excellent corrosion resistance, high strength, and light weight. However, these advantages are also accompanied by challenges in installation and testing. Currently, the hydrostatic test of GRP pipes still uses the traditional method of filling the entire pipe with water for hydrostatic testing, which has many problems and limitations.

[0003] Specifically, the traditional GRP pipe joint water pressure test method steps are as follows: First, the staff needs to use blind plates and sealing rings to tightly seal both ends of the pipe section to be tested. Then, a large amount of fresh water is injected into the entire GRP pipe until the pipe is completely filled. Next, a booster pump is used to continuously apply pressure to the pipe, while carefully observing and checking for any water leaks. If it is confirmed that there is no leakage, the water is drained and the entire test process is completed. Although this traditional method can achieve the test purpose, it has many shortcomings:

[0004] First of all, this method consumes a lot of water. Considering the large diameter and length of the GRP pipe, each test requires a large amount of fresh water resources. In some areas where fresh water resources are scarce, this will undoubtedly increase water stress.

[0005] Secondly, the entire testing process is time-consuming and lengthy. It takes a long time to fill the long and large-diameter GRP pipe with water, and the drainage process is also time-consuming. This not only reduces work efficiency, but also prolongs the completion period of the entire project. Summary of the invention

[0006] The purpose of the present invention is to overcome the problems of low pressure testing efficiency and large amount of fresh water waste in the existing GRP pipe joint water pressure testing method, and to provide a GRP pipe joint water pressure testing method.

[0007] In a first aspect, the present invention provides a method for hydrostatic testing of a GRP pipe joint, comprising the following steps:

[0008] S1: Check whether the joints of two adjacent pipes to be tested are well connected;

[0009] S2: using an air bag to seal the joint of two adjacent pipes to be pressure tested, the air bag and the two adjacent pipes to be pressure tested form a pressure test space, and the pressure test space surrounds the joint of the two adjacent pipes to be pressure tested;

[0010] S3: injecting water into the pressure test space until the pressure in the pressure test space reaches the test pressure and then stabilizing the pressure;

[0011] S4: Observe whether the pressure drop in the pressure test space is within the allowable range. If the pressure drop is within the allowable range, the pressure test at the joints of the two adjacent pipes to be pressure tested is completed, and the next step is entered; if the pressure drop exceeds the allowable range, the joints of the two adjacent pipes to be pressure tested are repaired and S1-S3 are repeated until the pressure drop is within the allowable range;

[0012] S5: Move to the next test point and repeat S1-S4 until the water pressure test of the joints of all the pipelines to be pressure tested is completed.

[0013] Compared with the traditional testing method of sealing both ends of the GRP pipe and then injecting water to pressurize the entire GRP pipe, the GRP pipe joint water pressure testing method provided by the present invention only needs to inject water to pressurize the local space at the joints of two adjacent pipes to be tested, which greatly reduces the water consumption. In addition, since the method only needs to inject water to pressurize the local space, it greatly shortens the water pressure testing time, improves work efficiency, and helps to speed up the progress of the entire project.

[0014] Preferably, S1 comprises the following steps:

[0015] Remove foreign matter from the pipeline to be pressure tested, and check whether the joints of two adjacent pipelines to be pressure tested are loose or damaged. If so, repair or replace them.

[0016] First, check and clean the pipeline to be tested, and remove foreign matter in advance to prevent impurities from damaging the airbag under high pressure after the airbag is inflated. Check whether the joints of the pipeline to be tested are loose or damaged by visual inspection, so as to find and solve problems that may cause leakage in advance and prepare for subsequent joint pressure testing.

[0017] Preferably, the airbag forms two convex parts in a circumferential direction, a concave part is formed between the convex parts, and the convex part and the concave part are an integrally formed structure.

[0018] Preferably, S2 comprises the following steps:

[0019] Check the integrity of the airbag. After the airbag is inflated, one of the protrusions abuts against the inner wall of one of the two adjacent pipes to be pressure tested, the second protrusion abuts against the inner wall of the second of the two adjacent pipes to be pressure tested, and the pressure test space is formed between the recess and the two adjacent pipes to be pressure tested.

[0020] With this arrangement, the airbag forms an approximately "U"-shaped structure surrounding the joint, with two convex parts located on both sides of the joint. After the airbag is inflated, the convex parts abut against the inner walls of the pipes on both sides of the joint, ensuring a better sealing effect. Since the two convex parts and the concave part are an integrally formed structure, compared with the method of arranging an airbag on both sides of the joint, the concave part serves to connect the convex parts, which not only has better sealing performance, but also makes the first space enclosed by the concave part and the pipe more stable. During the pressure test, the pressure is evenly distributed on the convex part, concave part and the pipe to be pressure tested of the airbag, and it is not easy for the airbag to deform or shift due to excessive pressure and cause leakage, which improves the reliability and stability of the pressure test and enables the airbag to adapt to a larger test pressure.

[0021] Preferably, S2 comprises the following steps:

[0022] Draw a position auxiliary line on the pipeline to be pressure tested, move the airbag to the position auxiliary line, so that the center line of the recess is aligned with the joints of two adjacent pipelines to be pressure tested; adjust the height of the airbag so that the center of the airbag and the center of the joint of the pipeline to be pressure tested are positioned on the same straight line.

[0023] With this setting method, by drawing auxiliary position lines on the pipe to be pressure tested, the position of the airbag in the pipe can be quickly located. The center line of the recessed part is aligned with the joint, and the two convex parts can be accurately arranged on both sides of the joint to provide a better sealing effect. The center line of the airbag and the center of the joint are positioned on the same straight line, which can ensure that the convex part is tightly attached to the inner wall of the pipe after the airbag is inflated, providing a better sealing effect.

[0024] Preferably, S3 comprises the following steps:

[0025] Water is injected into the pressure test space, and the pressure in the pressure test space is monitored by a pressure tester. After the pressure in the pressure test space reaches the test pressure, the pressure is stabilized for 5-8 minutes.

[0026] Set the pressure to stabilize for 5-8 minutes to eliminate errors caused by pressure fluctuations in a short period of time and ensure the accuracy of the test results.

[0027] Preferably, the test pressure in S3 is 1.5 times the working pressure of the pipeline to be pressure tested, and the test pressure is less than the design pressure of the pipeline to be pressure tested.

[0028] Setting the test pressure to 1.5 times the working pressure can verify the performance and pressure bearing capacity of the pipeline under the actual working pressure, ensuring that the pipeline can still operate stably under higher than normal working pressure. Setting the test pressure lower than the pipeline design pressure can effectively avoid applying excessive pressure to the pipeline, thereby reducing the risk of pipeline rupture or damage during the test and ensuring the safety of the test process.

[0029] Preferably, the allowable pressure drop of the pressure test space in S4 is ≤0.02MPa.

[0030] Setting the allowable pressure drop to ≤0.02MPa improves the detection accuracy and can effectively identify tiny leaks or poor sealing problems.

[0031] Preferably, if the pressure drop exceeds the allowable range in S4, the integrity of the airbag is checked after the pressure of the airbag is relieved, and S2-S3 are repeated. If the pressure drop still exceeds the allowable range, the joints of two adjacent pipes to be pressure tested are repaired and S1-S3 are repeated until the pressure drop is within the allowable range and there is no leakage at the joints of the pipes to be pressure tested.

[0032] After the first pressure drop exceeds the allowable range, release the pressure first and then check the integrity of the airbag to find out whether the airbag is damaged, leaking, or improperly installed. If there is a problem with the airbag itself, replace the airbag and retest. If there is no problem with the integrity of the airbag, it can be determined that the leak occurs at the joint, ensuring the accuracy of the test results.

[0033] Preferably, S5 comprises the following steps:

[0034] After the water in the pressure test space is discharged, the air pressure in the airbag is released, and the airbag is moved to the next test point and steps S1-S4 are repeated until the water pressure test of the joints of all the pipes to be pressure tested is completed.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] 1. The GRP pipe joint water pressure testing method provided by the present invention only needs to fill water and pressurize the local space between two adjacent pipe joints to be tested, which greatly reduces the water consumption;

[0037] 2. The GRP pipe joint water pressure testing method provided by the present invention only needs to fill water and pressurize the local space, which greatly shortens the water pressure testing time and improves work efficiency. When the construction period is tight, water pressure testing can be carried out on multiple GRP pipe joints at the same time, which helps to speed up the progress of the entire project. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 Flow chart of the hydrostatic test method for GRP pipe joints.

[0039] Figure 2 Use state diagram for airbag.

[0040] Figure 3 Schematic diagram of the airbag structure.

[0041] Markings in the figure:

[0042] 1-air bag, 11-convex part, 12-concave part, 121-center line, 100-pipeline to be pressure tested, 101-position auxiliary line, 200-pressure test space. DETAILED DESCRIPTION

[0043] The present invention is further described in detail below in conjunction with specific embodiments. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0044] Unless otherwise specified, in the description of the specific embodiments of the present invention, the terms indicating the orientation or position relationship such as "up", "down", "left", "right", "center", "inside", "outside", etc. are all based on the expression of the orientation or position relationship shown in the drawings, or are the orientation or position relationship when the invented product / equipment / device is usually used. These terms of orientation or position relationship are only for the convenience of describing the scheme of the present invention or simplifying the description in the specific embodiments, so as to facilitate the technicians to quickly understand the scheme, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific position relationship, and therefore cannot be understood as a limitation on the present invention.

[0045] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel" and the like appear, it does not mean that the corresponding devices / components / elements are required to be absolutely horizontal or vertical or overhanging or parallel, but may be slightly tilted or have deviations. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but may be slightly tilted. Alternatively, it can be simplified to mean that the corresponding devices / components / elements are set in directions such as "horizontal", "vertical", "overhanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, and more preferably an error / deviation within ±4%. As long as the corresponding devices / components / elements are within the error / deviation range, they can still achieve their functions in the scheme of the present invention.

[0046] In addition, the expressions “first”, “second”, “third”, etc., which appear in the terms, are merely used to distinguish the description of the same or similar components and should not be understood as emphasizing or implying the relative importance of specific components.

[0047] In addition, in the description of the embodiments of the present invention, "several", "plurality" and "a number" represent at least 2. It can be any number such as 2, 3, 4, 5, 6, 7, 8, 9, and even more than 9.

[0048] In addition, in the description of the technical solution of the present invention, unless otherwise clearly specified / defined / restricted, the terms "set", "install", "connect", "connected", "provided with", "laid", and "arranged" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, and can be welding, riveting, bolting, threading, and other commonly used connection means in the field. This connection can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal connection of two elements.

[0049] Example 1

[0050] The present embodiment provides a method for water pressure testing a GRP pipe joint. The method can perform a water pressure test on the joint of the pipe to be pressure tested 100 from the inside of the pipe to be pressure tested 100.

[0051] The GRP pipe joint water pressure testing method provided in this embodiment comprises the following steps:

[0052] S1: Check whether the joints of two adjacent pipelines 100 to be pressure tested are well connected;

[0053] Specifically, before conducting the pressure test, under the condition that ventilation safety is met, the operating personnel can enter the pipeline 100 to be pressure tested (before the operating personnel enter, arrange for dedicated personnel to wear gas masks to enter the pipeline to detect the gas, and perform the operation after ensuring safety) to remove foreign objects in the pipeline 100 to be pressure tested to prevent metal, gravel and other debris from affecting subsequent pressure test operations.

[0054] The operator can also check whether the joints of the two adjacent pressure-tested pipes 100 are loose or damaged. If they are loose, the joints of the two adjacent pressure-tested pipes 100 need to be tightened. If they are damaged, the damaged parts need to be repaired. If they cannot be repaired, the pressure-tested pipe 100 needs to be replaced or the pipe sleeve joint needs to be replaced and the joint needs to be re-sealed from the outside of the pipe.

[0055] S2: Use the airbag 1 to seal the joint of two adjacent pipes 100 to be pressure tested. The airbag 1 and the two adjacent pipes 100 to be pressure tested form a pressure testing space 200. The pressure testing space 200 surrounds the joint of the two adjacent pipes 100 to be pressure tested.

[0056] Specific as Figure 2 , Figure 3 As shown, the airbag 1 of this embodiment can be a circular ring structure. The airbag 1 can be mounted on a circular moving trolley to facilitate the movement of the airbag 1, and the circular moving trolley can also provide support for the airbag 1. The airbag 1 forms two convex portions 11 in the circumferential direction. The two convex portions 11 can be arranged in the width direction of the airbag 1 (for example, Figure 3The concave portion 12 is formed between the convex portions 11, and the convex portions 11 and the concave portions 12 are an integrally formed structure. Here, the integrally formed structure can be, for example, that the interior of the airbag 1 is an inflatable cavity, and the interiors of the convex portions 11 and the concave portions 12 are connected, and the airbag 1 is integrally formed in the factory. When the airbag 1 is inflated, the height of the two convex portions 11 is higher than the height of the concave portion 12. For example, during production, the material thickness of the concave portion 12 can be made greater than the thickness of the convex portion 11. Thicker materials will limit the degree of expansion of the airbag 1, thereby maintaining a lower height after inflation; or materials with different elastic coefficients can be used. The concave portion 12 uses rubber with a smaller elastic coefficient, while the convex portion 11 uses rubber with a larger elastic coefficient. In this way, under the same pressure, the degree of expansion of the concave portion 12 will be less than that of the convex portion 11, and the height of the convex portion 11 after inflation can also be greater than the height of the concave portion 12.

[0057] Furthermore, S2 further includes the following steps:

[0058] Check the integrity of the airbag 1. For example, before installing the airbag 1, visually check whether the airbag 1 is obviously damaged. Before the formal test, inflate the airbag 1 to a certain pressure, immerse it in water or apply soapy water on the surface to observe whether bubbles appear.

[0059] After the airbag 1 is inflated, one of the convex parts 11 abuts against the inner wall of one of the two adjacent pipes 100 to be pressure tested, for example Figure 2 As shown, Figure 2 The convex portion 11 on the left side of the middle is in close contact with the inner wall of the left side of the pressure test pipe 100; the second convex portion 11 is in contact with the inner wall of the second of the two adjacent pressure test pipes 100, for example Figure 2 As shown, Figure 2The convex portion 11 on the middle right side is tightly attached to the inner wall of the right side pipe 100 to be pressure tested; the concave portion 12 spans the joint of two adjacent pipes 100 to be pressure tested, and a pressure test space 200 is formed between the concave portion 12 and the two adjacent pipes 100 to be pressure tested. After the airbag 1 is inflated, the two convex portions 11 and the concave portion 12 of the airbag 1 can seal the pressure test space 200. The airbag 1 forms an approximately "U"-shaped structure around the joint, and the two convex portions 11 are respectively located on both sides of the joint. After the airbag 1 is inflated, the convex portions 11 abut against the inner walls of the pipes on both sides of the joint, ensuring a better sealing effect; since the two convex portions 11 and the concave portion 12 are an integrally formed structure, compared to the method of providing one airbag 1 on both sides of the joint, the concave portion 12 plays the role of connecting the convex portion 11, which not only has better sealing performance, but also the pressure test space 200 surrounded by the concave portion 12, the convex portion 11 and the pressure test pipe 100 is more stable. During the pressure test, the pressure is evenly distributed on the convex portions 11, The concave portion 12 and the pipe 100 to be pressure tested are not prone to deformation or displacement of the airbag 1 and leakage due to excessive pressure. The one-piece airbag 1 has a more stable structure, and there is no need to set limiting components on both sides of the airbag 1 during pressure testing. There is no need to worry about the airbag 1 deviating from the pressure test position due to excessive pressure in the pressure test space 200 (if an airbag is set on each side of the joint, the airbags on both sides of the joint may be pushed to both sides due to excessive pressure in the pressure test space 200, resulting in pressure leakage), which improves the reliability and stability of the pressure test and enables the airbag 1 to adapt to a larger pressure test pressure.

[0060] Furthermore, S2 may also include the following steps:

[0061] like Figure 2 As shown, a position auxiliary line 101 can be drawn on the pipeline 100 to be pressure tested. The position auxiliary line 101 can be drawn on the left and / or right side of the joint of two adjacent pipelines 100 to be pressure tested. The distance between the position auxiliary line 101 and the joint can be half the width of the airbag 1. Move the airbag 1 to the position auxiliary line 101. At this time, the airbag 1 is, for example, Figure 2 , Figure 3 The outermost side in the X direction is aligned with the position auxiliary line 101, so that the center line 121 of the recess 12 is aligned with the joints of two adjacent pipelines 100 to be pressure tested;

[0062] Adjust the height of the airbag 1 so that the center of the airbag 1 and the center of the joint of the pressure-tested pipe 100 are positioned in the same straight line, which can be specifically positioned by pulling a line on the central axis of the pressure-tested pipe 100. By drawing a position auxiliary line 101 on the pressure-tested pipe 100, it can help to quickly locate the position of the airbag 1 in the pipe. The center line 121 of the concave part 12 is aligned with the joint, and the two convex parts 11 can be accurately arranged on both sides of the joint to provide a better sealing effect; the center line 121 of the airbag 1 and the center of the joint are positioned in the same straight line, which can ensure that the convex part 11 is tightly attached to the inner wall of the pipe after the airbag 1 is inflated, so that the convex part 11 fills the vertical section of the pressure-tested pipe 100, providing a better sealing effect.

[0063] S3: Connect the water pump to the water truck, use the water pump to inject fresh water into the pressure test space 200, connect the pressure tester to the pressure test space 200, monitor the pressure in the pressure test space 200 through the pressure tester, inject water until the pressure in the pressure test space 200 reaches the test pressure, and then stabilize the pressure for 5-8 minutes; the test pressure here is 1.5 times the working pressure of the pipeline 100 to be tested, and the test pressure should be less than the design pressure of the pipeline 100 to be tested. For example, the working pressure of the GRP pipeline is 5bar, and the design pressure of the GRP pipeline is 10bar, so the test pressure is 1.5 times the working pressure, 7.5bar, or 0.75Mpa, for testing.

[0064] S4: Observe whether the pressure drop in the pressure test space 200 is within the allowable range. The specific allowable range of the pressure drop can be set to ≤0.02MPa. If the pressure drop is within the allowable range, the pressure test at the joint of the two adjacent pressure test pipes 100 is completed, and the next step is entered. If the pressure drop exceeds the allowable range, the joint of the two adjacent pressure test pipes 100 is repaired and S1-S3 are repeated until the pressure drop is within the allowable range.

[0065] S5: After draining the fresh water in the pressure test space 200, the air pressure in the airbag 1 is released, and the airbag 1 is moved to the next test point by a moving cart, and S1-S4 are repeated until the water pressure test of the joints of all the pipelines 100 to be pressure tested is completed.

[0066] Compared with the traditional testing method of sealing both ends of the GRP pipe and then injecting water to pressurize the entire GRP pipe, the GRP pipe joint water pressure testing method provided in this embodiment only needs to inject water to pressurize the local space at the joint of two adjacent pipes to be tested 100, which greatly reduces the water consumption. And because this method only needs to inject water to pressurize the local space, it greatly shortens the water pressure testing time, improves work efficiency, and helps to speed up the progress of the entire project.

[0067] Example 2

[0068] Different from Example 1, in this embodiment, if the pressure drop in S4 exceeds the allowable range, the airbag 1 can be depressurized first and then the integrity of the airbag 1 can be checked, and then S2-S3 can be repeated. If the pressure drop still exceeds the allowable range, the joints of the two adjacent pipes 100 to be pressure tested are repaired and S1-S3 is repeated until the pressure drop is within the allowable range and there is no leakage at the joints of the pipes 100 to be pressure tested.

[0069] After the first pressure drop exceeds the allowable range, release the pressure first and then check the integrity of the airbag 1 to find out whether there is damage, leakage or improper installation of the airbag 1. If there is a problem with the airbag 1 itself, replace the airbag 1 and retest. If there is no problem with the completeness of the airbag 1, it can be determined that the leakage occurs at the joint, ensuring the accuracy of the test results.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for testing the water pressure of a GRP pipe joint, characterized in that: The following steps are involved: S1: Check whether the joints of two adjacent pipelines to be pressure tested (100) are well connected; S2: using an air bag (1) to seal the joint of two adjacent pipes (100) to be pressure tested, the air bag (1) and the two adjacent pipes (100) to be pressure tested form a pressure testing space (200), and the pressure testing space (200) surrounds the joint of the two adjacent pipes (100) to be pressure tested; S3: injecting water into the pressure test space (200) until the pressure in the pressure test space (200) reaches the test pressure and then stabilizing the pressure; S4: Observe whether the pressure drop in the pressure test space (200) is within the allowable range. If the pressure drop is within the allowable range, the pressure test at the joint of the two adjacent pipes to be pressure tested (100) is completed, and the next step is entered. If the pressure drop exceeds the allowable range, the joint of the two adjacent pipes to be pressure tested (100) is repaired and S1-S3 are repeated until the pressure drop is within the allowable range. S5: Move to the next test point and repeat S1-S4 until the water pressure test of the joints of all the pipelines (100) to be pressure tested is completed.

2. A GRP pipe joint water pressure testing method according to claim 1, characterized in that: S1 includes the following steps: Foreign objects in the pipeline (100) to be pressure tested are removed, and the joints of two adjacent pipelines (100) to be pressure tested are checked to see if they are loose or damaged. If so, they are repaired or replaced.

3. A GRP pipe joint water pressure testing method according to claim 1, characterized in that: The airbag (1) is circumferentially formed with two convex parts (11), a concave part (12) is formed between the convex parts (11), and the convex part (11) and the concave part (12) are an integrally formed structure.

4. A GRP pipe joint water pressure testing method according to claim 2, characterized in that: S2 includes the following steps: The integrity of the airbag (1) is checked. After the airbag (1) is inflated, one of the protrusions (11) abuts against the inner wall of one of the two adjacent pipes (100) to be pressure tested, and the other of the protrusions (11) abuts against the inner wall of the other of the two adjacent pipes (100) to be pressure tested. The pressure test space (200) is formed between the recess (12) and the two adjacent pipes (100) to be pressure tested.

5. A GRP pipe joint water pressure testing method according to claim 4, characterized in that: S2 includes the following steps: Drawing a position auxiliary line (101) on the pipeline (100) to be pressure tested, and moving the airbag (1) to the position auxiliary line (101) so that the center line (121) of the recess (12) is aligned with the joints of two adjacent pipelines (100) to be pressure tested; The height of the airbag (1) is adjusted so that the center of the airbag (1) and the center of the joint of the pipeline (100) to be pressure tested are positioned on the same straight line.

6. A GRP pipe joint water pressure testing method according to claim 1, characterized in that: S3 includes the following steps: Water is injected into the pressure test space (200), and the pressure in the pressure test space (200) is monitored by a pressure tester. After the pressure in the pressure test space (200) reaches the test pressure, the pressure is stabilized for 5-8 minutes.

7. A GRP pipe joint water pressure testing method according to claim 1, characterized in that: The test pressure in S3 is 1.5 times the working pressure of the pipeline (100) to be pressure tested, and the test pressure is less than the design pressure of the pipeline (100) to be pressure tested.

8. A GRP pipe joint water pressure testing method according to claim 1, characterized in that: The allowable pressure drop of the pressure test space (200) in S4 is ≤ 0.02 MPa.

9. A GRP pipe joint water pressure testing method according to claim 1, characterized in that: If the pressure drop exceeds the allowable range in S4, the integrity of the airbag (1) is checked after the pressure is released, and S2-S3 are repeated. If the pressure drop still exceeds the allowable range, the joints of two adjacent pipes (100) to be pressure tested are repaired and S1-S3 is repeated until the pressure drop is within the allowable range and there is no leakage at the joints of the pipes (100) to be pressure tested.

10. A GRP pipe joint water pressure testing method according to claim 1, characterized in that: S5 includes the following steps: After the water in the pressure test space (200) is discharged, the air pressure in the airbag (1) is released, and the airbag (1) is moved to the next test point and steps S1-S4 are repeated until the water pressure test of the joints of all the pipes (100) to be pressure tested is completed.

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