A pipeline plugging device and a water pressure test method

Abstract

The present invention belongs to a pressure testing method, and particularly relates to a pipeline plugging device and a water pressure testing method. A pipeline plugging device, which includes an expansion plug and a support. The remarkable effect of the present invention is that this patented invention mainly conducts research and guidance from aspects such as feasibility study, operability, and theoretical support, playing a "textbook" role in isolating the circuits that cannot conduct water pressure test boundaries or temporarily pressurizing the circuit boundaries in special cases during the subsequent installation of nuclear power pipelines, and providing a reference for the popularization and use of subsequent projects.

Description

Technical Field

[0001] The present invention belongs to a pressure testing method, and particularly relates to a pipeline plugging device and a water pressure testing method. Background Art

[0002] Generally, the water pressure test of the excess drain pipeline connected to the main pipeline is carried out synchronously with the main pipeline. However, due to design changes, when the excess drain pipeline is separately water pressure tested after the statutory water pressure test, special pipeline plugging devices such as expansion plugs can be used to plug the main pipeline to isolate the excess drain pipeline from the main pipeline, and finally the excess drain pipeline can be separately water pressure tested.

[0003] The treatment method of the prior art is as follows: For the traditional system loop flushing and pressure testing, all boundaries of the loop need to be plugged and isolated using blind plates. For online equipment that does not participate in the pressure testing, temporary simulation parts need to be installed. Whether to set a bypass for the check valve or remove the valve core, connect a safety device (safety valve), and set a systematic device after the pressure reducing valve at the outlet of each pump and other series of measures to ensure that there is no leakage in the loop participating in the water pressure test. The isolation process is relatively cumbersome and needs to be treated rigorously during the inspection process.

[0004] The defect of the prior art is that: in the case of no isolation boundary such as a valve in the traditional system loop pressure testing, the loop range needs to be expanded until a boundary with isolation function is found. This will result in that when the water pressure test is carried out on the excess drain pipeline that cannot be isolated from the main pipeline, the water pressure test needs to be carried out on the entire loop including the main pipeline, which involves a large range, complex processes, and a long implementation process. Summary of the Invention

[0005] The content of the present invention is to provide a pipeline plugging device and a water pressure testing method in view of the defects of the prior art.

[0006] The present invention is implemented as follows: A pipeline plugging device, which includes an expansion plug and a support.

[0007] A pipeline plugging device as described above, wherein the expansion plug includes a screw rod, and a sleeve, a tapered end and an expansion sleeve are sleeved on the screw rod.

[0008] A pipeline plugging device as described above, wherein the tapered end is arranged at the topmost end of the screw rod, and the expansion sleeve is arranged below the tapered end.

[0009] A pipeline plugging device as described above, wherein the sleeve is arranged in the middle of the screw rod, and a nut is arranged below the sleeve.

[0010] A pipeline plugging device as described above, wherein the support includes a steel pipe and an arc-shaped plate.

[0011] A pipeline plugging device as described above, wherein the arc-shaped plate is arranged above the steel pipe, and the steel pipe and the arc-shaped plate are fixedly connected by nuts.

[0012] A method for hydrostatic pressure testing of a pipeline plugging device, which includes an installation support method, an installation expansion plug method, and a hydrostatic pressure test.

[0013] A method for hydrostatic pressure testing of a pipeline plugging device as described above, wherein the installation support method includes the following content

[0014] (1) Weld two nuts to the steel pipe.

[0015] (2) Install two nuts in the middle of the screw rod.

[0016] (3) Screw the assembled steel pipe and nuts onto the screw rod to assemble into an adjustable support.

[0017] (4) Weld an arc-shaped plate with specifications of 200X140X12.7 at one end of the adjustable support.

[0018] (5) The other end of the adjustable support is installed above the expansion plug.

[0019] (6) Install a rubber pad between the arc-shaped plate and the inner wall of the main pipeline.

[0020] (7) Use the support nut for adjustment to stably install the expansion plug and the support.

[0021] A method for hydrostatic pressure testing of a pipeline plugging device as described above, wherein the installation expansion plug method includes the following content

[0022] (1) The screw rod component passes through the tapered end component and is welded.

[0023] (2) Install the expansion plug outside the tapered end.

[0024] (3) Place the assembled expansion plug and tapered end at the nozzle of the main pipeline.

[0025] (4) Install the sleeve on the upper part of the tapered end component.

[0026] (5) Fasten with nuts and use a torque wrench to fasten to 149 N·m according to the requirements of JB-T5000.10.

[0027] A method for hydrostatic pressure testing of a pipeline plugging device as described above, wherein the hydrostatic pressure test includes the following content

[0028] Use the main pipeline product witness piece to simulate the on-site main pipeline, calculate the volume of the local hydrostatic test pipeline, set a volume compensator equal to its volume, and connect it through the pipeline, nozzle and main pipeline product witness piece to form a simulated hydrostatic test loop, and carry out adaptive transformation, install a pressure testing device, establish an isolation boundary, simulate two pressures of 22.8 Mpa and 25 Mpa respectively, and conduct multiple tests.

[0029] The remarkable effect of the present invention is that the patented invention mainly conducts research and guidance from aspects such as feasibility study, operability and theoretical support, and plays a "textbook" role in isolating the loop where hydrostatic test cannot be carried out or the loop boundary isolation for temporary pressure testing in special cases during subsequent nuclear power pipeline installation, providing a reference for the popularization and use of subsequent projects. Brief Description of the Drawings

[0030] Figure 1 It is a structural schematic diagram of a pipeline plugging device;

[0031] Figure 2 It is a structural schematic diagram of a screw rod;

[0032] Figure 3 It is a structural schematic diagram of a sleeve;

[0033] Figure 4 It is a structural schematic diagram of the support structure.

[0034] Among them, 1. Conical end, 2. Sleeve, 3. Expansion sleeve, 4. Nut, 5. Screw rod, 6. Screw rod, 7. Steel pipe, 8. Arc plate, 9. Nut Detailed Description of the Invention

[0035] A pipeline plugging device includes the following: an expansion plug and a support.

[0036] Composition of the expansion plug: The device is mainly an assembly composed of a conical end, a sleeve, an expansion sleeve, a nut and a screw rod.

[0037] Principle and function: Adopt the design principle of an expansion bolt, use a screw rod of M16X350, pass through the conical end and weld it, set an expansion rubber sleeve outside the conical end, and set a sleeve on the upper part of the screw rod to form a main pipeline expansion plug device, and achieve the expansion operation of the expansion sleeve by tightening the nut.

[0038] Method of installing the expansion plug

[0039] (1) The 5th screw rod component passes through the 1st conical end component and is welded.

[0040] (2) Install the 3rd component expansion plug outside the 1st component conical end;

[0041] (3) Place the assembled 3rd and 1st components at the main pipeline nozzle.

[0042] (4) Install the No. 2 component on the upper part of the No. 1 component;

[0043] (5) Fasten it with the No. 4 component, and use a torque wrench to fasten it to 149 N·m according to the requirements of JB-T5000.10;

[0044] Support structure: This device is mainly composed of a screw rod, a steel pipe, an arc plate, and a nut.

[0045] This support device is composed of 6. screw rod (M39X400), 7. steel pipe (2”X8.74), 8. arc plate (200X140X12.7), 9. nut (M39).

[0046] Principle and function: To avoid damage to the inner wall of the main pipeline caused by the extrusion, slipping, etc. of the temporary expansion plug device of the main pipeline during use, a support is designed above the main pipeline expansion plug installed at the nozzle of the main pipeline to assist in supporting the expansion plug and prevent risks such as extrusion and slipping of the expansion plug after being stressed.

[0047] Installation support method

[0048] (1) Weld the 9th part nuts (2 pieces) to the 7th part steel pipe;

[0049] (2) Install the 9th part nuts (2 pieces) in the middle of the 6th part screw rod;

[0050] (3) Screw the assembled parts of the 7th and 9th parts onto the 6th part screw rod to assemble into an adjustable support;

[0051] (4) Weld the 8th part arc plate with the specification of 200X140X12.7 at one end of the adjustable support;

[0052] (5) Install the other end of the adjustable support above the expansion plug;

[0053] (6) Install a rubber pad between the arc plate and the inner wall of the main pipeline;

[0054] (7) Use the support nut (9th part) for adjustment to firmly install the expansion plug and the support.

[0055] Hydrostatic test

[0056] Use the main pipeline product witness (with the same dimensions and materials as the main pipeline) to simulate the on-site main pipeline, and calculate the volume of the local hydrostatic test pipeline (about 0.014m 3), set a volume compensator (temporary pipeline) equal to its volume, connect it through pipelines, nozzles and the main pipeline product witness piece to form a simulated hydrostatic test circuit, and conduct adaptive transformation. Install a pressure testing device, establish an isolation boundary, simulate two pressures of 22.8 Mpa and 25 Mpa (1.1 times the test pressure) respectively, and conduct multiple tests. The process is briefly described as follows

[0057]

[0058]

[0059] Before the hydrostatic test, check the integrity of the equipment, documents and consumables required for the test item by item. The main ones are as follows:

[0060] Serial number Inspection item classification Name Name Name Name 1 Equipment and measuring instruments Pressure pump High-pressure hose Special tools Pressure gauge 2 Documents Construction plan Water quality report Pressure test report JSA analysis form 3 Consumable materials Rubber gasket Drain pipe Warning tape

Claims

1. A pipeline plugging device, characterized in that: It includes an expansion plug and a support; The expansion plug mentioned above includes a screw rod (5), on which a sleeve (2), a conical end (1) and an expansion sleeve (3) are sleeved; The conical end (1) is arranged at the topmost end of the screw rod (5), and the expansion sleeve (3) is arranged below the conical end (1); The sleeve (2) is arranged in the middle of the screw rod (5), and a nut is arranged below the sleeve (2); The support includes a steel pipe (7) and an arc-shaped plate (8); The arc-shaped plate (8) is arranged above the steel pipe (7), and the steel pipe (7) and the arc-shaped plate (8) are fixedly connected by a nut (9).

2. A method for hydrostatic pressure testing of a pipeline plugging device, characterized in that: It includes an installation support method, an installation expansion plug method and a hydrostatic test; The installation support method includes the following contents, (1) Weld two nuts to the steel pipe; (2) Install two nuts in the middle of the screw rod; (3) Screw the assembly of the steel pipe and the nut onto the screw rod to assemble into an adjustable support; (4) Weld an arc-shaped plate with specifications of 200X140X12.7 at one end of the adjustable support; (5) Install the other end of the adjustable support above the expansion plug; (6) Install a rubber pad between the arc-shaped plate and the inner wall of the main pipeline; (7) Use a support nut for adjustment to stably install the expansion plug and the support; The installation expansion plug method includes the following contents, (1) The screw rod component passes through the conical end component and is welded; (2) Install the expansion plug outside the conical end component; (3) Place the assembly of the expansion plug and the conical end at the nozzle of the main pipeline; (4) Install the sleeve on the upper part of the conical end component; (5) Fasten it with a nut, and use a torque wrench to fasten it to 149 N.m according to the requirements of JB-T5000.10; The hydrostatic test includes the following contents, Use the main pipeline product witness piece to simulate the on-site main pipeline, calculate the volume of the local hydrostatic test pipeline, set a volume compensator equal to its volume, and connect through the pipeline, nozzle and main pipeline product witness piece to form a simulated hydrostatic test loop, and carry out adaptive transformation, install a pressure testing device, establish an isolation boundary, simulate two pressures of 22.8 Mpa and 25 Mpa respectively, and conduct multiple tests.

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