An integrated tooling for hydrostatic testing of instrument tanks in nuclear power plants

Abstract

This utility model discloses an integrated tooling for hydrostatic testing of nuclear power instrument tanks, including a header body, a distribution pipe assembly, branch pipes, a pressure gauge, and auxiliary lifting lugs. The header body has welded sealing plates on both sides, and multiple rows of branch pipe holes are formed on the header body, with a corresponding branch pipe installed in each hole. The end of each branch pipe is used to connect to the pipe of the nuclear power instrument tank to be tested. A water inlet is formed in the middle of the header body, and a pressure gauge connector hole is formed on the header body for installing a pressure gauge. Auxiliary lifting lugs are welded to the header body. This utility model can complete the hydrostatic testing process of nuclear power instrument tanks. The porous structure of the distribution pipe assembly disperses the concentrated water flow into smaller flow rates, and the enlarged diameter design of the transition joint reduces the local resistance coefficient. Combined with vibration to eliminate air resistance, it ensures smooth and efficient water injection into the tank. Furthermore, the array structure allows for batch synchronous testing, reducing the number of times the pressurization equipment is started and stopped, improving testing efficiency, and saving energy.

Description

Technical Field

[0001] This utility model relates to the field of tooling technology for nuclear power equipment manufacturing, and in particular to an integrated tooling for hydrostatic testing of nuclear power instrument tanks, which is suitable for solving the technical problems of poor water flow and low efficiency in hydrostatic testing of nuclear power instrument tanks. Background Technology

[0002] Nuclear power plant instrument tanks (including condensate tanks, condensate tanks, sealing tanks, scrubbing tanks, and exhaust condensate tanks) are critical equipment in the nuclear power plant's instrumentation system. They are used to collect, cool, and drain condensate from pipelines to prevent its accumulation from causing instrument measurement distortion or system malfunction. These devices are typically cylindrical or spherical tanks with end caps and connecting pipes at the top for connecting instruments, and require hydrostatic testing according to nuclear-grade manufacturing standards. However, due to the small size of these tanks and the narrow diameter of the connecting pipes, the tanks are sealed during the hydrostatic test, and the internal pressure can easily rise during water injection, preventing water from flowing smoothly. Furthermore, each instrument tank requires a separate pressurization, pressure holding, and depressurization process, resulting in long testing cycles, high labor costs, and low efficiency. Frequent start-ups and shutdowns of pressurization equipment also increase energy consumption.

[0003] Therefore, there is an urgent need to design an efficient and reliable hydraulic testing fixture to solve the above problems. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model designs an integrated tooling for hydrostatic testing of nuclear power instrument tanks, aiming to solve the problems of poor water flow and low efficiency in hydrostatic testing of nuclear power instrument tanks.

[0005] The present invention adopts the following technical solution:

[0006] An integrated tooling for hydrostatic testing of instrument tanks in nuclear power plants includes a main body of the header, a distribution pipe assembly, branch pipes, a pressure gauge, and auxiliary lifting lugs;

[0007] The main body of the header is welded with header sealing plates on both sides. Multiple rows of branch pipe holes are opened on the main body of the header. A branch pipe is installed on each branch pipe hole. The end of the branch pipe is used to connect to the nuclear power instrument tank pipe to be tested. A water inlet is opened in the middle of the main body of the header. A pressure gauge connector hole is opened on the main body of the header for installing a pressure gauge. Auxiliary lifting lugs are welded on the main body of the header.

[0008] The distribution pipe assembly is located inside the header body and consists of a distribution pipe body, a distribution pipe sealing plate, and a water inlet connector. The distribution pipe body has a porous pipe structure, and the water inlet connector passes through the water inlet hole and is welded and fixed to the header body. Auxiliary lifting lugs are used to apply mechanical vibration during the test to eliminate water flow and air resistance.

[0009] Preferably, the branch pipe is connected to a transition joint at its end, and the end of the transition joint is used to connect to the nuclear power instrument tank pipe to be tested.

[0010] Preferably, the transition joint has an internal connecting cavity with a diameter 20%-30% larger than the pipe diameter to reduce flow resistance.

[0011] Preferably, a transition joint sealing plate is installed at the end of the branch pipe. The transition joint sealing plate is used to seal the branch pipe that is not connected to the nuclear power instrument tank pipe for testing.

[0012] Preferably, the main body of the header has three rows of branch pipe holes, and three rows of branch pipes are welded on the three rows of branch pipe holes. The three rows of branch pipes include two rows of bent pipes and one row of straight pipes.

[0013] Preferably, the main surface of the distribution pipe has uniformly spaced water injection holes with a diameter of 3-5 mm. These holes are used to disperse the water flow into small-flow-rate injection branches.

[0014] Preferably, the distribution pipe sealing plate is welded to both ends of the distribution pipe body.

[0015] Preferably, pressure gauges are installed on both sides of the main body of the header.

[0016] The beneficial effects of this utility model are: This utility model can complete the hydrostatic test process of nuclear power instrument tanks. The porous structure of the distribution pipe assembly disperses the concentrated water flow into small flow rates. The enlarged diameter design of the transition joint reduces the local resistance coefficient. Combined with vibration to eliminate air resistance, it ensures that the water flow is smoothly and efficiently injected into the tank. Moreover, the array structure can realize batch synchronous testing, reduce the number of times the pressurization equipment is started and stopped, improve test efficiency, and save energy. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a schematic diagram of a distribution pipe assembly in this utility model;

[0019] Figure 3 This is a schematic diagram of one of the two states of the transition joint in this utility model;

[0020] In the diagram: 1-1, main body of the header; 1-2, header sealing plate; 1-3, distribution pipe assembly; 1-4, branch pipe; 1-5, transition joint; 1-6, pressure gauge; 1-7, auxiliary lifting lug; 1-8, transition joint sealing plate; 1-9, condensate tank connection pipe; 2-1, main body of the distribution pipe; 2-2, distribution pipe sealing plate; 2-3, water inlet connector. Detailed Implementation

[0021] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings:

[0022] Example: Figure 1 As shown, an integrated tooling for hydrostatic testing of a nuclear power plant instrument tank includes a main body 1-1, a distribution pipe assembly 1-3, a branch pipe 1-4, a transition joint 1-5, a pressure gauge 1-6, and an auxiliary lifting lug 1-7.

[0023] The main body of the header is welded with header sealing plates 1-2 on both sides. Multiple rows of branch pipe holes are opened on the main body of the header. A branch pipe is installed on each branch pipe hole. The end of the branch pipe is used to connect to the nuclear power instrument tank pipe to be tested. A water inlet hole is opened in the middle of the main body of the header. A pressure gauge connector hole is opened on the main body of the header for installing a pressure gauge. An auxiliary lifting lug is welded on the main body of the header.

[0024] The distribution pipe assembly is located inside the main body of the header, such as Figure 2 As shown, the distribution pipe assembly consists of a distribution pipe body 2-1, a distribution pipe sealing plate 2-2, and an inlet connector 2-3. The distribution pipe body is a multi-hole pipe structure, and the inlet connector passes through the inlet hole and is welded and fixed to the main body of the manifold.

[0025] like Figure 3 As shown, a transition joint is connected to the end of the branch pipe. The end of the transition joint is used to connect to the pipe of the nuclear power instrument tank to be tested. The transition joint has a connecting cavity inside, and the diameter of the cavity is 20%-30% larger than the diameter of the pipe.

[0026] The branch pipe is equipped with a transition joint sealing plate 1-8. The transition joint sealing plate is used to seal the branch pipe that is not connected to the nuclear power instrument tank pipe for testing.

[0027] The main body of the container has three rows of branch pipe holes, and three rows of branch pipes are welded on the three rows of branch pipe holes. The three rows of branch pipes include two rows of bends and one row of straight pipes.

[0028] Water injection holes with a diameter of 3-5mm are evenly distributed on the surface of the main body of the distribution pipe. The sealing plates of the distribution pipe are welded to both ends of the main body. Pressure gauges are installed on both sides of the main body of the header.

[0029] Water pressure test method for condenser:

[0030] Install the distribution pipe assembly 1-3 into the main body of the header 1-1, so that the water inlet connector 2-3 extends out from the water inlet hole, and then weld it in place; weld the branch pipe 1-4, including the bend and the straight pipe, onto the main body of the header, weld the transition connector 1-5 at the end of the branch pipe, weld the auxiliary lifting lug 1-7 and the header sealing plates 1-2 on both sides onto the main body of the header, and install the pressure gauge 1-6.

[0031] Connect and fix the condenser tube 1-9 to the transition joint 1-5, and apply lubricant to the sealing surface.

[0032] Turn on the booster pump. Water flows through the inlet connector 2-3 into the distribution pipe assembly 1-3, and after being dispersed through the water injection hole, it flows into the branch pipe. When the pressure gauge 1-6 shows that the pressure has reached the test value, use the auxiliary lifting lug 1-7 to apply mechanical vibration for 2 minutes to remove residual air bubbles. Maintain the pressure for 30 minutes until the pressure fluctuation range is qualified. After depressurization, disassemble the condenser and check the welds and sealing surfaces for leaks.

[0033] Batch instrument tank water pressure test:

[0034] According to the different equipment water pressure test pressure levels, the three-row branch pipes 1-4 are numbered and marked, and the corresponding transition joints 1-5 are welded to the end of the branch pipes to connect multiple instrument tanks. The pressure is increased to the test value in one go and maintained, which greatly improves the test efficiency.

[0035] This invention effectively solves the technical bottleneck in the hydrostatic testing of nuclear power plant instrument tanks through integrated design, multi-hole diversion, and vibration assistance. It combines high efficiency, reliability, and economy, and is suitable for the mass manufacturing and testing of nuclear power plant instrument tanks.

[0036] The embodiments described above are merely preferred solutions of this utility model and are not intended to limit this utility model in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims.

Claims

1. A hydrotest integrated tooling for a nuclear instrument tank, characterized in that, It includes the main body of the header, the distribution pipe assembly, the branch pipe, the pressure gauge, and the auxiliary lifting lugs; The main body of the header is welded with header sealing plates on both sides. Multiple rows of branch pipe holes are opened on the main body of the header. A branch pipe is installed on each branch pipe hole. The end of the branch pipe is used to connect to the nuclear power instrument tank pipe to be tested. A water inlet is opened in the middle of the main body of the header. A pressure gauge connector hole is opened on the main body of the header for installing a pressure gauge. Auxiliary lifting lugs are welded on the main body of the header. The distribution pipe assembly is located inside the main body of the header and consists of a distribution pipe body, a distribution pipe sealing plate, and a water inlet connector. The distribution pipe body is a multi-hole pipe structure, and the water inlet connector passes through the water inlet hole and is welded and fixed to the main body of the header.

2. The integrated hydrotest tooling for nuclear instrument tank according to claim 1, characterized in that, The branch pipe is connected to a transition joint at its end, and the end of the transition joint is used to connect to the nuclear power instrument tank pipe to be tested.

3. The integrated hydrotest tooling for nuclear instrument tank according to claim 2, characterized in that, The transition joint has an internal connecting cavity, the diameter of which is 20%-30% larger than the diameter of the connecting pipe.

4. The integrated hydrotest tooling for nuclear instrument tank according to claim 1, characterized in that, The branch pipe is equipped with a transition joint sealing plate at its end.

5. The integrated hydrotest tooling for nuclear instrument tank according to claim 1, characterized in that, The main body of the header has three rows of branch pipe holes, and three rows of branch pipes are welded on the three rows of branch pipe holes. The three rows of branch pipes include two rows of bends and one row of straight pipes.

6. The integrated hydrotest tooling for nuclear instrument tank according to claim 1, characterized in that, The main surface of the distribution pipe has water injection holes with a diameter of 3-5 mm evenly distributed.

7. The integrated hydrotest tooling for nuclear instrument tank according to claim 1, characterized in that, The distribution pipe sealing plate is welded to both ends of the distribution pipe body.

8. The integrated hydrotest tooling for nuclear instrument tank according to claim 1, characterized in that, Pressure gauges are installed on both sides of the main body of the container.

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