Hydraulic pressure test device for large-pipe-diameter hand gluing opening connection glass fiber reinforced plastic pipeline of nuclear power station, flushing and pressing method, drainage method and inspection manhole opening method

Abstract

The invention belongs to the technical field of pipeline construction, and particularly relates to a hydraulic test device for a large-pipe-diameter hand gluing opening connection glass fiber reinforced plastic pipeline of a nuclear power station, a flushing and pressing method, a drainage method and an inspection manhole opening method. Comprising a left blind end, a pipeline to be subjected to pressure test and a right blind end which are sequentially connected, a water inlet, a pressure gauge and an exhaust port are sequentially fixed above the right blind end, and a water outlet is fixed below the right blind end. The beneficial effects are that an integral pressure test mode is used for replacing an original pressure test in a small sealed cavity, and the reliability of a large-caliber glass fiber reinforced plastic pipeline hydraulic pressure test is improved; connection is carried out in an on-site manual arc mode, after the pressure test is finished, the whole device can be used for the whole pressure test of the next pipe section in a mode of cutting off an accumulation part, and the repeated manufacturing cost of the device is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of pipeline construction, and in particular relates to a nuclear power plant large-diameter hand-jointed glass fiber reinforced plastic pipeline water pressure testing device and a flushing pressure testing method, a drainage method and a maintenance manhole opening method. Background Art

[0002] FRP pipe is a new type of composite material pipe, which mainly uses glass fiber as reinforcement material and unsaturated polyester resin, epoxy resin and other high molecular weight components as basic materials. FRP pipe has been widely used in nuclear power plants due to its unique strong corrosion resistance, smooth inner surface, low transmission energy consumption, long service life, convenient transportation and installation, low maintenance cost and low comprehensive cost.

[0003] The connection of FRP pipes adopts the hand lay-up process, which is the earliest and most commonly used molding method in the production of resin-based composite materials. The hand lay-up process uses a resin mixture with a curing agent as the matrix and glass fiber and its fabric as the reinforcing material. The glass fiber and its fabric are bonded together by hand brushing and pasting. However, for large-diameter FRP pipes, due to various objective conditions such as water source, water volume, difficulty in end plugging, and inability to drain, it is impossible to conduct a water pressure acceptance test on the entire pipeline and to check whether there is leakage at the on-site hand lay-up.

[0004] Therefore, the present invention has innovatively developed a nuclear power plant large-diameter hand-connected glass fiber reinforced plastic pipeline water pressure testing device, which has the characteristics of simple structure, convenient operation, and reusability. Summary of the invention

[0005] In view of the shortcomings of the existing nuclear power plant large diameter hand-connected fiberglass pipe water pressure test, the purpose of the present invention is to provide a nuclear power plant large diameter hand-connected fiberglass pipe water pressure test device and a flushing pressure method, a drainage method and a maintenance manhole opening method, which can improve the efficiency of the large diameter hand-connected fiberglass pipe water pressure test and enhance the reliability of the fiberglass pipe water pressure test.

[0006] The technical solution of the present invention is as follows: a nuclear power plant large-diameter hand-connected glass fiber reinforced plastic pipe water pressure test device, including a left blind end, a pipe to be pressure tested and a right blind end, the left blind end, the pipe to be pressure tested and the right blind end are connected in sequence, the water inlet, the pressure gauge and the exhaust port are fixed in sequence above the right blind end, and the drain port is fixed below the right blind end.

[0007] The left blind end is connected to the inspection hole flange by hand.

[0008] A certain number of connecting studs and connecting nuts are fixed on the inspection hole flange, and the inspection hole flange is connected to the pipeline to be pressure tested through the connecting studs and connecting nuts.

[0009] At the same time, the inspection hole flange and the pipeline to be pressure tested are sealed by a sealing ring.

[0010] A water flushing and pressure testing method for a nuclear power plant large-diameter hand-held fiberglass reinforced plastic pipeline water pressure testing device comprises the following steps:

[0011] 1) Connect the left and right blind ends to the two sides of the pipeline to be tested by hand;

[0012] 2) Fix the pressure gauge at the corresponding position of the right blind end through the quick connector;

[0013] 3) Unscrew the control valves of the water inlet and exhaust port, and connect the water supply pipe to the water inlet;

[0014] 4) Open the water supply valve, and the water source enters the FRP pipe to be pressure tested through the water inlet;

[0015] 5) Observe the pressure indicator at all times during the water filling process;

[0016] 6) When the pressure indication meets the requirements of the pressure test standard, immediately close the control valves of the water inlet and exhaust port and start the timer;

[0017] 7) Observe the pressure indication within the pressure holding time required by the standard specification and record the reduced value.

[0018] A drainage method for a nuclear power plant large-diameter hand-connected glass fiber reinforced plastic pipe water pressure test device comprises the following steps:

[0019] 1) Connect the drain pipe to the drain outlet;

[0020] 2) After the pressure holding process is completed, open the exhaust port control valve;

[0021] 3) Open the drain valve, and the water in the FRP pipe flows through the drain port and is discharged through the drain pipe;

[0022] 4) After all the water in the FRP pipe is drained, close the exhaust and drain control valves;

[0023] 5) Use special equipment to cut off the overlapping parts of the left and right blind ends and the hand-bonded connection of the pipeline to be pressure tested;

[0024] 6) Save the device for the next pressure test.

[0025] A method for opening a maintenance manhole of a large-diameter hand-connected glass fiber reinforced plastic pipeline water pressure test device in a nuclear power plant comprises the following steps:

[0026] 1) After draining the water used in the hydraulic test, use tools to loosen and remove the connecting studs and bolts on the inspection hole flange;

[0027] 2) Open the inspection hole flange and remove the sealing ring;

[0028] 3) Maintenance personnel enter the FRP pipe through the inspection hole flange to perform maintenance operations;

[0029] 4) After the inspection, reinstall the sealing ring into the sealing groove and tighten the connecting studs and bolts;

[0030] 5) Carry out the water pressure test again.

[0031] The beneficial effects of the present invention are: the overall pressure test method replaces the original pressure test in a smaller closed cavity, thereby improving the reliability of the water pressure test of large-diameter fiberglass reinforced plastic pipelines; the present invention is connected by means of on-site hand arcs, and after the pressure test is completed, the entire device can be used for the next overall pressure test of the pipe section by cutting off the accumulated part, thereby reducing the repeated manufacturing cost of the device; the left part of the present invention adds a maintenance manhole by means of flange connection, and if a leak is found during pressure testing, the inside of the pipeline can be entered through the maintenance manhole for repair, thereby avoiding repeated manual installation and improving the pressure testing efficiency; the right part of the present invention integrates the water inlet, water outlet, exhaust port and pressure gauge and other devices on the water pressure test device, which is convenient for personnel to perform corresponding operations and improves work efficiency; all parts of the present invention connected to the main pipeline are connected by means of hand arcs, which greatly improves the overall strength and pressure testing stability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of a nuclear power plant large-diameter hand-connected glass fiber reinforced plastic pipe water pressure test device provided by the present invention;

[0033] Figure 2 A schematic diagram of the flushing and pressure testing process of a nuclear power plant large-diameter hand-held fiberglass pipe water pressure test device provided by the present invention;

[0034] Figure 3 A schematic diagram of the drainage process of a nuclear power plant large-diameter hand-held fiberglass pipe water pressure test device provided by the present invention;

[0035] Figure 4 The present invention provides a schematic diagram of a maintenance manhole for a nuclear power plant large-diameter hand-connected fiberglass reinforced plastic pipeline water pressure testing device.

[0036] In the figure: 1 left blind end, 2 inspection hole flange, 3 sealing ring, 4 connecting nut, 5 connecting stud, 6 pipeline to be pressure tested, 7 water inlet, 8 pressure gauge, 9 exhaust port, 10 right blind end, 11 drain port. DETAILED DESCRIPTION

[0037] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] The present invention provides a nuclear power plant large-diameter hand-pasted fiberglass pipe water pressure test device, which is used to improve the problems existing in the existing nuclear power plant fiberglass pipe water pressure test. The pipeline water pressure test device is used to replace the existing situation of only conducting water pressure tests in a smaller closed chamber by on-site hand-pasting and overall pressure testing, so that the entire section of the pipeline can participate in the water pressure test, and the reliability of the subsequent use of the pipeline can be improved. At the same time, the device can be reused. After each pressure test, only the accumulated part needs to be cut off and it can be used for the next overall pressure test of the pipe section. The water inlet, water outlet, exhaust port, pressure gauge and other interfaces are integrated on one side of the device for easy operation and observation, and all interface positions are fixed to the main device by hand-pasting to improve the strength of the interface and ensure smooth pressure testing. A flange inspection channel is added on the left side of the water pressure test device. If a leak occurs during the pressure testing process, the inside of the pipeline can be entered through the inspection channel to repair the leak, avoiding the overall removal of the tooling. The specific implementation process is as follows:

[0039] In order to solve the problem that during the water pressure test of large-diameter FRP pipelines in traditional nuclear power plants, a connecting sleeve is sleeved on the butt joint of two pipelines, a pressure test nozzle is provided on the connecting sleeve, and the water pressure test is only carried out in the smaller closed cavity between the sealing rubber rings of the two pipelines, and the pressure bearing capacity of other pipelines is not tested and verified, the test device is fixed on both sides of the large-diameter FRP pipeline to be tested by hand-jointed connection, and the pressure test device and the FRP pipeline are pressurized as a whole, which ensures the reliability of the water pressure test of the FRP pipeline.

[0040] In order to solve the problem that traditional large-diameter glass pipe water pressure testing devices cannot be reused, the present invention adopts an on-site hand arc method for connection. After the pressure test is completed, the entire device can be used for the next overall pressure test of the pipe section by cutting off the water paste accumulation part, which effectively reduces the repeated manufacturing cost of the device.

[0041] In order to solve the problem that when a traditional nuclear power plant's large-diameter hand-sealed FRP pipeline is subjected to a water pressure test and leaks occur during the pressure test, the tooling needs to be completely removed for leak repair. The present invention increases a maintenance manhole on one side of the device by means of a flange connection. When an abnormal situation such as pipeline leakage occurs, the inside of the pipeline can be entered for repair by opening the maintenance manhole, thus avoiding repeated installation of the hand-sealed pipeline and greatly improving the fault tolerance rate.

[0042] In order to solve the problem that the water inlet and outlet, exhaust and other interfaces of the traditional FRP pipe water pressure testing device are located on both sides of the pressure testing device, and personnel need to cross a long distance to perform corresponding operations, the present invention integrates all external interfaces such as water inlet and outlet, exhaust, pressure gauge, etc. in the testing device on one side of the device, and all interfaces are connected by hand arc, which greatly facilitates personnel to perform corresponding operations, improves work efficiency, and enhances the overall strength and stability of the device.

[0043] like Figure 1-4 As shown, a nuclear power plant large-diameter hand-connected glass fiber reinforced plastic pipe water pressure test device includes: a left blind end 1, an inspection hole flange 2, a sealing ring 3, a connecting nut 4, a connecting stud 5, a pipe to be pressure tested 6, a water inlet 7, a pressure gauge 8, an exhaust port 9, a right blind end 10, and a drain port 11.

[0044] Among them, the left blind end 1, the pipe to be pressure tested 6 and the right blind end 10 are connected in sequence, the left blind end 1 is connected to the inspection hole flange 2 by means of hand-sealing, a certain number of connecting studs 5 and connecting nuts 4 are fixed on the inspection hole flange 2, the inspection hole flange 2 is connected to the pipe to be pressure tested 6 by means of connecting studs 5 and connecting nuts 4, and at the same time, the inspection hole flange 2 and the pipe to be pressure tested 6 are sealed by a sealing ring 3, the pipe to be pressure tested 6 is connected to the right blind end 10 by means of hand-sealing, the water inlet 7, the pressure gauge 8 and the exhaust port 9 are fixed above the right blind end 10 by means of hand arc in sequence, and the drain outlet 11 is fixed below the right blind end 10 by means of hand arc.

[0045] like Figure 2 As shown in the figure, the flushing and pressure testing steps of the hydraulic pressure test device are mainly divided into the following stages:

[0046] 1) Connect the left blind end 1 and the right blind end 10 to the two sides of the pipeline to be pressure tested by hand;

[0047] 2) Fix the pressure gauge 8 at the corresponding position of the right blind end 10 through the quick connector;

[0048] 3) Unscrew the control valves of the water inlet 7 and the exhaust port 9, and connect the water supply pipe to the water inlet 7;

[0049] 4) Open the water supply valve, and water enters the FRP pipe to be pressure tested through the water inlet 7;

[0050] 5) During the water filling process, always observe the pressure gauge 8 reading;

[0051] 6) When the reading on the pressure gauge 8 meets the requirements of the pressure test standard, immediately close the control valves of the water inlet (7) and the exhaust port 9, and start timing;

[0052] 7) Observe the indication of pressure gauge 8 within the pressure holding time required by the standard specification and record the reduced value.

[0053] like Figure 3 As shown in the figure, the drainage steps of the hydraulic test device are mainly divided into the following stages:

[0054] 1) The drain pipe is connected to the drain outlet 11;

[0055] 2) After the pressure-maintaining process is completed, open the exhaust port 9 control valve;

[0056] 3) Open the control valve of the drain port 11, and the stored water in the FRP pipe flows through the drain port 11 and is drained through the drain pipe;

[0057] 4) After all the water in the FRP pipe is drained, close the control valves of the exhaust port 9 and the drain port 11;

[0058] 5) Use special equipment to cut off the overlapping parts of the left blind end 1 and the right blind end 10 and the hand-bonded connection of the pipeline to be pressure tested;

[0059] 6) Store the device properly for the next pressure test.

[0060] like Figure 4 As shown in the figure, the steps for opening the manhole for maintenance of the hydraulic test device are mainly divided into the following stages:

[0061] 1)Reference Figure 3 After draining the water used in the hydraulic test, use tools to loosen and remove the connecting studs 5 and connecting bolts 4 on the inspection hole flange 2;

[0062] 2) Open the inspection hole flange 2 and remove the sealing ring 3;

[0063] 3) Maintenance personnel enter the FRP pipe through the inspection hole flange 2 to perform maintenance operations;

[0064] 4) After the inspection is completed, reinstall the sealing ring 3 into the sealing groove and tighten the connecting stud 5 and the connecting bolt 4;

[0065] 5)Reference Figure 2 , conduct the water pressure test again.

Claims

1. A nuclear power plant large diameter hand-held fiberglass pipe water pressure test device, characterized in that: It includes a left blind end, a pipeline to be pressure tested and a right blind end. The left blind end, the pipeline to be pressure tested and the right blind end are connected in sequence. The water inlet, the pressure gauge and the exhaust port are fixed in sequence above the right blind end, and the drain port is fixed below the right blind end.

2. A nuclear power plant large diameter hand-held fiberglass pipe water pressure test device as claimed in claim 1, characterized in that: The left blind end is connected to the inspection hole flange by hand.

3. A nuclear power plant large diameter hand-held fiberglass pipe water pressure test device as claimed in claim 1, characterized in that: A certain number of connecting studs and connecting nuts are fixed on the inspection hole flange, and the inspection hole flange is connected to the pipeline to be pressure tested through the connecting studs and connecting nuts.

4. A nuclear power plant large diameter hand-held fiberglass pipe water pressure test device as claimed in claim 1, characterized in that: At the same time, the inspection hole flange and the pipeline to be pressure tested are sealed by a sealing ring.

5. A method for flushing and pressurizing a nuclear power plant large-diameter hand-held fiberglass pipe water pressure test device, characterized in that: The steps include: 1) Connect the left and right blind ends to the two sides of the pipeline to be tested by hand; 2) Fix the pressure gauge at the corresponding position of the right blind end through the quick connector; 3) Unscrew the control valves of the water inlet and exhaust port, and connect the water supply pipe to the water inlet; 4) Open the water supply valve, and the water source enters the FRP pipe to be pressure tested through the water inlet; 5) Observe the pressure indicator at all times during the water filling process; 6) When the pressure indication meets the requirements of the pressure test standard, immediately close the control valves of the water inlet and exhaust port and start the timer; 7) Observe the pressure indication within the pressure holding time required by the standard specification and record the reduced value.

6. A drainage method for a nuclear power plant large-diameter hand-connected glass fiber reinforced plastic pipe water pressure test device, characterized in that: The steps include: 1) Connect the drain pipe to the drain outlet; 2) After the pressure holding process is completed, open the exhaust port control valve; 3) Open the drain valve, and the water in the FRP pipe flows through the drain port and is discharged through the drain pipe; 4) After all the water in the FRP pipe is drained, close the exhaust and drain control valves; 5) Use special equipment to cut off the overlapping parts of the left and right blind ends and the hand-bonded connection of the pipeline to be pressure tested; 6) Save the device for the next pressure test.

7. A method for opening the inspection manhole of a large-diameter hand-connected glass fiber reinforced plastic pipeline water pressure test device in a nuclear power plant, characterized in that: The steps include: 1) After draining the water used in the hydraulic test, use tools to loosen and remove the connecting studs and bolts on the inspection hole flange; 2) Open the inspection hole flange and remove the sealing ring; 3) Maintenance personnel enter the FRP pipe through the inspection hole flange to perform maintenance operations; 4) After the inspection, reinstall the sealing ring into the sealing groove and tighten the connecting studs and bolts; 5) Carry out the water pressure test again.

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