Pressure test method for pumping and storing upstream connecting pipe and telescopic pipe

Abstract

The invention belongs to the technical field of pressure testing, and discloses a pressure testing method for pumping and storing an upstream connecting pipe and a telescopic pipe, in the pressure testing method, the number of special tools is four, and the special tools are distributed and supported on the middle portion of an upstream connecting pipe telescopic pipe assembly and the joint face of an industrial sealing cover. The height of the special tool located in the middle of the upstream connecting pipe telescopic pipe assembly is larger than that of the special tool located on the industrial sealing cover binding face of the upstream connecting pipe telescopic pipe assembly, and when the special tools support the upstream connecting pipe telescopic pipe assembly, the upstream connecting pipe telescopic pipe assembly is kept in a horizontal state. The hydraulic test is in a transverse state, so that the safety risk is greatly reduced; a vertical state is adopted only when the process sealing cover is closed and detached, so that the time occupied by a crane is greatly reduced; the total weight is not more than 80t in a vertical state, so that the requirement of a workshop crane is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of drilling moulds, and in particular relates to a pressure test method for a pumping and storage upstream connecting pipe and a telescopic pipe. Background Art

[0002] A pressure test method for the upstream connecting pipe and telescopic pipe of a pumped storage turbine. The upstream connecting pipe and telescopic pipe are important components of a pumped storage turbine. The maximum length of the upstream connecting pipe is 5m2, the maximum length of the telescopic pipe is 2m8, the maximum diameter of the flange side of the upstream connecting pipe and the telescopic pipe is 4m2, and the maximum diameter of the pipe body is 3m3. Both need to undergo a post-weld water pressure test, with a maximum test pressure of 15MPa.

[0003] The current technology is to connect the non-flange side of the upstream connecting pipe and the expansion pipe by welding, and then lift it to a vertical state, and seal the flange sides at both ends with the process sealing covers respectively; after the sealing is completed, water is filled through the water inlet on the upper process sealing cover, and after the water filling is completed, the water inlet is sealed; then a water pressure test is carried out in a vertical state; after the water pressure is qualified, the water is discharged through the water outlet on the lower process sealing cover; then the horizontal state is restored, the connecting weld is cut, and the upstream connecting pipe and the expansion pipe are separated.

[0004] The existing technical solution has a high safety risk in the vertical state. The weight of the upstream connecting pipe, telescopic pipe and process sealing cover is about 80t, and the weight will exceed 160t after filling with water. The total height in the vertical state exceeds 11 meters. At present, in order to avoid safety hazards, a crane is used to fix the workpiece above to prevent it from tipping over and other unsafe states. In addition, due to the high height in the vertical state, there is a risk of personnel climbing up when performing work such as fitting the process sealing cover or filling water above it. The solution has too high requirements for the lifting weight of the factory crane, and most factories cannot meet the requirements. In addition, the long-term occupation of the crane affects the normal production of other workshops.

[0005] In order to solve the above problems, a pressure test method for the upstream connecting pipe and the telescopic pipe of the pumping storage is proposed. Summary of the invention

[0006] The object of the present invention is to provide a pressure test method for an upstream connecting pipe and a telescopic pipe of a pumped storage device in order to solve the above problems, characterized in that it comprises the following steps:

[0007] S1. Connect one side of the upstream connecting pipe to the flange side of the expansion pipe by welding;

[0008] S2. Hoist the connected upstream connecting pipe expansion pipe assembly;

[0009] S3. First, place one side of the process sealing cover flat on the special support tooling, with the closing surface facing upwards, and use special process bolts to close the lower process sealing cover. After one side is closed, lift and turn over the upstream connecting pipe telescopic pipe assembly, and place the other side of the process sealing cover flat on the special support tooling, lift the upstream connecting pipe telescopic pipe assembly into it, and use special process bolts to close the process sealing cover;

[0010] S4. After the assembly is completed, the upstream connecting pipe telescopic pipe assembly is hoisted to a horizontal state and supported by a special tooling. After placement, a scaffolding is built around the entire workpiece;

[0011] S5. Use the entrance door hole to fill water. After the filling is completed, use the entrance door cover plate or plug plate to seal the entrance door hole. According to the project situation, the entrance door cover plate or welding plug plate can be used for sealing;

[0012] S6. Perform water pressure test according to design requirements and measure deformation at each position. Conventionally, only the deformation of flanges on both sides is measured. In this state, additional measuring points are added under the workpiece to measure deformation.

[0013] S7. Remove the cover plate or blocking plate of the entrance door and drain water through the hole of the entrance door using a pump;

[0014] S8. Lift it to a vertical state to remove the process sealing cover at the bottom, then turn it over to remove the process sealing cover at the other end; then restore it to a horizontal state, cut the connecting weld, and separate the upstream connecting pipe and the telescopic pipe.

[0015] In a preferred embodiment, the hoisting method in step S2 is vertical hoisting, specifically, the upstream connecting pipe is located at the upper end of the telescopic pipe.

[0016] Through the above technical solution, the sealing cover of the vertical state closing process is efficient.

[0017] In a preferred embodiment, the number of the special tooling in step S4 is four, which are distributed and supported on the middle part of the upstream connecting pipe telescopic pipe assembly and the mating surface of the industrial sealing cover.

[0018] In a preferred embodiment, the height of the special tooling located in the middle of the upstream connecting pipe telescopic pipe assembly is greater than the special tooling located on the mating surface of the industrial sealing cover of the upstream connecting pipe telescopic pipe assembly.

[0019] Through the above technical solution, when the special tooling supports the upstream connecting pipe telescopic pipe group, it is kept in a horizontal state.

[0020] In a preferred embodiment, the access door hole on the telescopic tube is facing upwards during placement in step S4.

[0021] Through the above technical solution, it is convenient to fill water into the interior of the upstream connecting pipe expansion pipe group through the access door hole.

[0022] In a preferred embodiment, the maximum water pressure test pressure in step S6 is 15 MPa.

[0023] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows: the present invention proposes a pressure test method for the upstream connecting pipe and the telescopic pipe of the pumped storage device.

[0024] 1. The hydraulic pressure test is in a horizontal state, which greatly reduces safety risks;

[0025] 2. The vertical state is only used when assembling and disassembling the process sealing cover, which greatly reduces the time occupied by the crane; 3. The total weight in the vertical state does not exceed 80t, reducing the requirements for the workshop crane. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is the state diagram at S1 in the present invention;

[0027] Figure 2 It is the state diagram at S3 in the present invention;

[0028] Figure 3 This is the state diagram at S4 in the present invention. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] The following will be combined Figure 1-3 A method for pressure testing an upstream connecting pipe and a telescopic pipe of a pumped storage device according to an embodiment of the present invention is described in detail.

[0031] Example:

[0032] A method for pressure testing an upstream connecting pipe and a telescopic pipe of a pumped storage device, characterized in that it comprises the following steps:

[0033] S1. Connect one side of the upstream connecting pipe to the flange side of the expansion pipe by welding;

[0034] S2. Hoist the connected upstream connecting pipe telescopic pipe assembly in a vertical hoisting manner. Specifically, the upstream connecting pipe is located at the upper end of the telescopic pipe, and the sealing cover is closed in a vertical state for high efficiency;

[0035] S3. First, place one side of the process sealing cover flat on the special support tooling, with the closing surface facing upwards, and use special process bolts to close the lower process sealing cover. After one side is closed, lift and turn over the upstream connecting pipe telescopic pipe assembly, and place the other side of the process sealing cover flat on the special support tooling, lift the upstream connecting pipe telescopic pipe assembly into it, and use special process bolts to close the process sealing cover;

[0036] S4. After the assembly is completed, the upstream connecting pipe telescopic pipe assembly is hoisted to a horizontal state and supported by a special tooling, with the access door hole on the telescopic pipe facing upwards. After placement, a scaffolding is built around the entire workpiece;

[0037] S5. Use the entrance door hole to fill water. After the filling is completed, use the entrance door cover plate or plug plate to seal the entrance door hole. According to the project situation, the entrance door cover plate or welding plug plate can be used for sealing;

[0038] S6. Perform water pressure test according to design requirements. The maximum water pressure test pressure is 15MPa, and measure the deformation at each position. Conventionally, only the deformation of the flanges on both sides is measured. In this state, additional measuring points are added under the workpiece to measure the deformation.

[0039] S7. Remove the cover plate or blocking plate of the entrance door and drain water through the hole of the entrance door using a pump;

[0040] S8. Lift it to a vertical state to remove the process sealing cover at the bottom, then turn it over to remove the process sealing cover at the other end; then restore it to a horizontal state, cut the connecting weld, and separate the upstream connecting pipe and the telescopic pipe.

[0041] In the present invention, the number of special tooling is four, and the special tooling is distributed and supported at the middle part of the upstream connecting pipe telescopic pipe assembly and the mating surface of the industrial sealing cover.

[0042] In the present invention, the height of the special tooling located in the middle of the upstream connecting pipe telescopic pipe assembly is greater than the special tooling located on the mating surface of the industrial sealing cover of the upstream connecting pipe telescopic pipe assembly. When the special tooling supports the upstream connecting pipe telescopic pipe assembly, it keeps it in a horizontal state.

[0043] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pressure test method for upstream connecting pipe and telescopic pipe of pumped storage, characterized in that: The steps include: S1. Connect one side of the upstream connecting pipe to the flange side of the expansion pipe by welding; S2. Hoist the connected upstream connecting pipe expansion pipe assembly; S3. First, place one side of the process sealing cover flat on the special support tooling, with the closing surface facing upwards, and use special process bolts to close the lower process sealing cover. After one side is closed, lift and turn over the upstream connecting pipe telescopic pipe assembly, and place the other side of the process sealing cover flat on the special support tooling, lift the upstream connecting pipe telescopic pipe assembly into it, and use special process bolts to close the process sealing cover; S4. After the assembly is completed, the upstream connecting pipe telescopic pipe assembly is hoisted to a horizontal state and supported by a special tooling. After placement, a scaffolding is built around the entire workpiece; S5. Use the entrance door hole to fill water. After the filling is completed, use the entrance door cover plate or plug plate to seal the entrance door hole. According to the project situation, the entrance door cover plate or welding plug plate can be used for sealing; S6. Perform water pressure test according to design requirements and measure deformation at each position. Conventionally, only the deformation of flanges on both sides is measured. In this state, additional measuring points are added under the workpiece to measure deformation. S7. Remove the cover plate or blocking plate of the entrance door and drain water through the hole of the entrance door using a pump; S8. Lift it to a vertical state to remove the process sealing cover at the bottom, then turn it over to remove the process sealing cover at the other end; then restore it to a horizontal state, cut the connecting weld, and separate the upstream connecting pipe and the telescopic pipe.

2. A pressure test method for upstream connecting pipe and telescopic pipe of pumped storage as claimed in claim 1, characterized in that: The hoisting method in step S2 is vertical hoisting, specifically, the upstream connecting pipe is located at the upper end of the telescopic pipe.

3. A pressure test method for upstream connecting pipe and telescopic pipe of pumped storage as claimed in claim 1, characterized in that: In step S4, there are four special toolings, which are distributed and supported at the middle part of the upstream connecting pipe telescopic pipe assembly and the mating surface of the industrial sealing cover.

4. A method for pressure testing of upstream connecting pipes and telescopic pipes for pumped storage as claimed in claim 3, characterized in that: The height of the special tooling located in the middle of the upstream connecting pipe telescopic pipe assembly is greater than the special tooling located on the mating surface of the industrial sealing cover of the upstream connecting pipe telescopic pipe assembly.

5. A pressure test method for upstream connecting pipe and telescopic pipe of pumped storage as claimed in claim 1, characterized in that: When placing in step S4, the access door hole on the telescopic tube faces upward.

6. A pressure test method for upstream connecting pipe and telescopic pipe of pumped storage as claimed in claim 1, characterized in that: The maximum water pressure test pressure in step S6 is 15 MPa.

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