A method for draining water from a test section pipe in a large-caliber liquid flow standard device

Abstract

The present invention discloses a test section pipeline drainage method in a large-caliber liquid flow standard device, by arranging a test section pipeline drainage device between the front straight pipe section and the front switch ball valve of the large-caliber liquid flow standard device, including a test pipeline drainage ball valve outlet pipe, a test pipeline drainage ball valve, a test pipeline drainage ball valve water inlet pipe, a test pipeline air inlet pipe, a test pipeline inlet ball valve, and a test pipeline inlet ball valve air inlet pipe, so as to solve the negative pressure problem when the front switch ball valve and the rear switch ball valve are closed to drain the test section pipeline. The drainage method of the present invention is simple to operate, safe and reliable, and well solves the drainage problem of the test section pipeline in the large-caliber liquid flow standard device, shortens the drainage time, and improves the work efficiency of the detection.

Description

Technical Field

[0001] The invention belongs to the field of flow detection, and in particular relates to a test section pipeline drainage method in a large-caliber liquid flow standard device. Background Art

[0002] like Figure 1 As shown, in a large-caliber liquid flow standard device, when the test instrument 10 is detected and needs to be removed from between the front straight pipe section 9 and the rear straight pipe section 11 of the large-caliber liquid flow standard device, due to the large diameter of the pipeline, even if the front switch ball valve 8 and the rear switch ball valve 12 are closed, there is still a large amount of pressurized static water in the pipeline between the front switch ball valve 8 and the rear switch ball valve 12. If the pressurized static water in the pipeline is not drained in advance and the tested instrument 10 between the front straight pipe section 9 and the rear straight pipe section 11 is directly removed, the large amount of pressurized static water in the pipeline will spray out from the gaps between the front straight pipe section 9 and the tested instrument 10, and between the rear straight pipe section 11 and the tested instrument 10, posing a water threat to other instruments on the device, the tested instrument 10 and the dismantling personnel.

[0003] To avoid this problem, the method currently adopted is to set a drain pipe in front of the front straight pipe section 9, and install a drain valve on the drain pipe. When the tested instrument 10 is tested and the water in the pipeline between the front switch ball valve 8 and the rear switch ball valve 12 needs to be drained, the front switch ball valve 8 is closed, and the rear switch ball valve 12 is kept open. Then the drain valve is opened to drain a large amount of water in the front straight pipe section 9, the rear straight pipe section 11 and the back pressure pipe 13. In this way, the safety of the tested instrument 10 when being removed can be guaranteed.

[0004] Although the method of keeping the rear switching ball valve open to drain the water in the pipe between the front switching ball valve and the rear switching ball valve is feasible, and solves the problem of negative pressure in the pipe during drainage, resulting in slow drainage or water being unable to be drained, in large-diameter liquid flow standard devices, the diameter of the back pressure pipe is usually relatively large, so there will be a large amount of water in the pipe. When draining the water in the pipe between the front switching ball valve and the rear switching ball valve, since the rear switching ball valve is kept open, a large amount of water in the back pressure pipe is also drained through the drain pipe at the same time. Since the amount of water in the pipe between the front switching ball valve and the rear switching ball valve and the amount of water in the back pressure pipe are both large, and the diameter of the drain pipe is usually small, it takes a long time to drain the water in the pipe when draining through the drain pipe, which seriously affects the working efficiency of the flow meter for detecting the large-diameter liquid flow standard device. Therefore, the above problem must be solved to improve the detection efficiency of the device. Summary of the invention

[0005] In order to better solve the above technical problems, the present invention provides a method for draining a test section pipeline in a large-caliber liquid flow standard device. By adding an air intake device (including a test pipeline inlet ball valve inlet pipe, a test pipeline inlet ball valve, and a test pipeline inlet pipe), the problem of negative pressure in the pipeline when the front switching ball valve and the rear switching ball valve are closed to drain the test section pipeline is well solved, the time for draining the test section pipeline is shortened, and the overall detection efficiency of the device is improved.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] The method of the present invention comprises the following steps:

[0008] 1) Select a set of test section pipeline drainage equipment, including the test pipeline drainage ball valve outlet pipe, the test pipeline drainage ball valve, the test pipeline drainage ball valve inlet pipe, the test pipeline inlet ball valve inlet pipe, the test pipeline inlet ball valve and the test pipeline inlet pipe.

[0009] 2) Install the test section pipeline drainage device between the front straight pipe section and the front switch ball valve of the large-diameter liquid flow standard device. First, fix the water inlet of the test pipeline drainage ball valve inlet pipe to the opening below the front straight pipe section short pipe, fix the water outlet of the test pipeline drainage ball valve inlet pipe to the water inlet of the test pipeline drainage ball valve, fix the water outlet of the test pipeline drainage ball valve to the water inlet of the test pipeline drainage ball valve, and fix the water outlet of the test pipeline drainage ball valve to the water inlet of the test pipeline drainage ball valve outlet pipe. The water outlet of the test pipeline drainage ball valve outlet pipe extends into the underground water tank;

[0010] The air inlet of the test pipeline inlet ball valve inlet pipe is exposed to the atmosphere, and its air outlet is fixedly connected to the air inlet of the test pipeline inlet ball valve, the air outlet of the test pipeline inlet ball valve is fixedly connected to the air inlet of the test pipeline inlet pipe, and the air outlet of the test pipeline inlet pipe is fixedly connected to the opening above the short pipe of the front straight pipe section.

[0011] 3) Install the instrument to be tested on the test table between the front straight pipe section and the rear straight pipe section, and inspect the instrument to be tested.

[0012] 4) After the instrument under test is inspected, close the front switch ball valve and the rear switch ball valve.

[0013] 5) Open the test pipe drain ball valve.

[0014] 6) Open the test pipeline inlet ball valve and wait for the water in the pipeline between the front switch ball valve and the rear switch ball valve to be drained out.

[0015] 7) After drainage is completed, close the test pipeline drain ball valve and the test pipeline inlet ball valve.

[0016] 8) Remove the instrument to be tested from between the front straight pipe section and the rear straight pipe section of the large-diameter liquid flow standard device.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention arranges a test section pipeline drainage device in a large-caliber liquid flow standard device, thereby solving the problem of negative pressure in the pipeline when the front switch ball valve and the rear switch ball valve are closed to drain water from the test section pipeline, and well realizes rapid drainage of the test section pipeline.

[0019] The drainage method of the present invention is simple to operate, safe and reliable, and well solves the drainage problem of the test section pipeline in a large-caliber liquid flow standard device, shortens the drainage time, and improves the work efficiency of the detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the installation of the test section pipeline drainage device used in the present invention in a large-caliber liquid flow standard device.

[0021] Figure 2 It is a structural schematic diagram of the test section pipeline drainage device used in the present invention.

[0022] In the figure: 1. Test pipeline drainage ball valve outlet pipe; 2. Test pipeline drainage ball valve; 3. Test pipeline drainage ball valve inlet pipe; 4. Test pipeline air inlet pipe; 5. Test pipeline inlet ball valve; 6. Test pipeline inlet ball valve inlet pipe; 7. Front straight pipe section short pipe; 8. Front switch ball valve; 9. Front straight pipe section; 10. Tested instrument; 11. Rear straight pipe section; 12. Rear switch ball valve; 13. Back pressure pipe; 14. Regulating ball valve; 15. Rear manifold; 16. Front manifold; 17. Front switch ball valve inlet pipe; 18. Pressure regulating tank outlet switch ball valve; 19. Pressure regulating tank; 20. Pressure regulating tank inlet switch ball valve; 21. Water pump. DETAILED DESCRIPTION

[0023] The present invention solves the problem of negative pressure when both the front switch ball valve and the rear switch ball valve are closed to drain water from the test section pipeline by adding a test pipeline drainage device to the traditional large-caliber liquid flow standard device.

[0024] like Figure 1 , Figure 2 As shown, the test section pipeline drainage device used in the present invention mainly includes a test pipeline drainage ball valve outlet pipe 1, a test pipeline drainage ball valve 2, a test pipeline drainage ball valve water inlet pipe 3, a test pipeline air inlet pipe 4, a test pipeline inlet ball valve 5 and a test pipeline inlet ball valve air inlet pipe 6.

[0025] In the large-diameter liquid flow standard device, the water pump 21 is connected to the pressure-stabilizing tank 19 through the pressure-stabilizing tank water inlet switch ball valve 20, the water outlet of the pressure-stabilizing tank 19 is connected to the front manifold 16 and the front switch ball valve water inlet pipe 17 through the pressure-stabilizing tank water outlet switch ball valve 18, the front switch ball valve water inlet pipe 17 is connected to the water inlet of the front switch ball valve 8, and the water outlet of the front switch ball valve 8 is connected to the front straight pipe section short pipe 7.

[0026] The water inlet of the test pipeline drainage ball valve inlet pipe 3 is fixedly connected to the opening below the short pipe 7 of the front straight pipe section, the water outlet of the test pipeline drainage ball valve inlet pipe 3 is fixedly connected to the water inlet of the test pipeline drainage ball valve 2, the water outlet of the test pipeline drainage ball valve 2 is fixedly connected to the water inlet of the test pipeline drainage ball valve outlet pipe 1, and the water outlet of the test pipeline drainage ball valve outlet pipe 1 extends into the underground water tank.

[0027] The air inlet of the test pipeline inlet ball valve inlet pipe 6 is exposed to the atmosphere, and its air outlet is fixedly connected to the air inlet of the test pipeline inlet ball valve 5, and the air outlet of the test pipeline inlet ball valve 5 is fixedly connected to the air inlet of the test pipeline inlet pipe 4, and the air outlet of the test pipeline inlet pipe 4 is fixedly connected to the opening above the front straight pipe section short pipe 7. The instrument to be tested 10 is installed between the front straight pipe section 9 and the rear straight pipe section 11, and the rear straight pipe section 11 is connected to the rear manifold 15 and the back pressure pipe 13 through the rear switch ball valve 12, and the rear switch ball valve 12 and the back pressure pipe 13 are provided with a regulating ball valve 14.

[0028] The test pipeline inlet ball valve inlet pipe 6 is an inverted "L" shape, which effectively prevents foreign matter from entering the test pipeline inlet ball valve inlet pipe 6 through the air inlet of the test pipeline inlet ball valve inlet pipe 6 exposed to the air.

[0029] After the test of the large-caliber liquid flow standard device is completed, the water in the test section pipeline must be drained before the tested instrument in the test section pipeline can be removed. By controlling the opening sequence between the test pipeline drainage ball valve and the test pipeline inlet ball valve, the test section pipeline drainage of the present invention can be better achieved.

[0030] The method for draining water from a test section pipeline in a large-caliber liquid flow standard device of the present invention comprises the following steps:

[0031] 1) Select a set of test section pipeline drainage devices, including test pipeline drainage ball valve outlet pipe 1, test pipeline drainage ball valve 2, test pipeline drainage ball valve inlet pipe 3, test pipeline inlet ball valve air inlet pipe 6, test pipeline inlet ball valve 5, test pipeline air inlet pipe 4.

[0032] 2) Install the above-mentioned test section pipeline drainage device between the front straight pipe section 9 and the front switch ball valve 8 of the large-diameter liquid flow standard device, first fix the water inlet of the test pipeline drainage ball valve water inlet pipe 3 to the opening below the front straight pipe section short pipe 7, fix the water outlet of the test pipeline drainage ball valve water inlet pipe 3 to the water inlet of the test pipeline drainage ball valve 2, fix the water outlet of the test pipeline drainage ball valve 2 to the water inlet of the test pipeline drainage ball valve outlet pipe 1, and extend the water outlet of the test pipeline drainage ball valve outlet pipe 1 into the underground water tank;

[0033] The air inlet of the test pipeline inlet ball valve inlet pipe 6 is exposed to the atmosphere, and its air outlet is fixedly connected to the air inlet of the test pipeline inlet ball valve 5, the air outlet of the test pipeline inlet ball valve 5 is fixedly connected to the air inlet of the test pipeline inlet pipe 4, and the air outlet of the test pipeline inlet pipe 4 is fixedly connected to the opening above the short pipe 7 of the front straight pipe section.

[0034] 3) Install the instrument 10 to be tested on the test position between the front straight pipe section 9 and the rear straight pipe section 11, and inspect the instrument 10 to be tested.

[0035] 4) When the instrument 10 to be tested is tested, close the front switch ball valve 8 and the rear switch ball valve 12.

[0036] 5) Open the test pipe drain ball valve 2.

[0037] 6) Open the test pipeline inlet ball valve 5 and wait for the water in the pipeline between the front switch ball valve 8 and the rear switch ball valve 12 to be drained out.

[0038] 7) After drainage is completed, close the test pipeline drainage ball valve 2 and the test pipeline inlet ball valve 5.

[0039] 8) Remove the instrument 10 to be tested from between the front straight pipe section 9 and the rear straight pipe section 11 of the large-diameter liquid flow standard device.

Claims

1. A method for draining a test section pipeline in a large-caliber liquid flow standard device, characterized in that The method comprises the following steps: 1) Select a set of test section pipeline drainage devices, including the test pipeline drainage ball valve outlet pipe, the test pipeline drainage ball valve, the test pipeline drainage ball valve inlet pipe, the test pipeline inlet ball valve inlet pipe, the test pipeline inlet ball valve and the test pipeline inlet pipe; 2) Install the test section pipeline drainage device between the front straight pipe section and the front switch ball valve of the large-diameter liquid flow standard device. First, fix the water inlet of the test pipeline drainage ball valve inlet pipe to the opening below the front straight pipe section short pipe, fix the water outlet of the test pipeline drainage ball valve inlet pipe to the water inlet of the test pipeline drainage ball valve, fix the water outlet of the test pipeline drainage ball valve to the water inlet of the test pipeline drainage ball valve, and fix the water outlet of the test pipeline drainage ball valve to the water inlet of the test pipeline drainage ball valve outlet pipe. The water outlet of the test pipeline drainage ball valve outlet pipe extends into the underground water tank; The air inlet of the test pipeline air inlet ball valve is exposed to the atmosphere, and its air outlet is fixedly connected to the air inlet of the test pipeline air inlet ball valve, the air outlet of the test pipeline air inlet ball valve is fixedly connected to the air inlet of the test pipeline air inlet pipe, and the air outlet of the test pipeline air inlet pipe is fixedly connected to the opening above the short pipe of the front straight pipe section; 3) Install the instrument to be tested on the test table between the front straight pipe section and the rear straight pipe section, and test the instrument to be tested; 4) After the instrument under test is tested, close the front switch ball valve and the rear switch ball valve; 5) Open the test pipeline drain ball valve; 6) Open the test pipeline inlet ball valve and wait for the water in the pipeline between the front switch ball valve and the rear switch ball valve to be drained out; 7) After draining, close the test pipeline drain ball valve and the test pipeline inlet ball valve; 8) Remove the instrument to be tested from between the front straight pipe section and the rear straight pipe section of the large-diameter liquid flow standard device.

2. The method for draining water from a test section pipe in a large-caliber liquid flow standard device according to claim 1, characterized in that: The test pipeline inlet ball valve inlet pipe is an inverted "L" shape to prevent foreign matter from entering the test pipeline inlet ball valve inlet pipe.

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