JPS58196437A - Parallel piping - Google Patents

Abstract

PURPOSE:To estimate the deterioration in the inner surface of a piping in the main system line from the results of the inspection, examination or the like as conducted as desired regardless of the operation of a plant by arranging a part of a parallel piping to be attached or detached freely. CONSTITUTION:In the course of pipings 1 composing the main system line to be monitored of a plant, a parallel piping 2 the same in the material and dimensions as the pipings 1 is connected in such a manner that a fluid flows identically to the pipings 1 in the main system line. The parallel piping 2 is provided with a sample feed piping 3 in such a manner as to be mounted or removed freely by a flange connection. A check valve 4 is provided each on the upstream and downstream thereof and a drain tube 5 is installed. When corrosive condition is found inside the pipings of the main system line during the operation of a plant, the check valve 4 is closed and the drain tube 5 opened to discharge a fluid inside and after the flange connection is removed, the sample feed tube 3 is taken out for checking.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] In order to obtain data that can confirm the internal deterioration state of the piping of the main system line, etc., along the main system line of the plant, Related to parallel piping installed in parallel.

(1) [Technical background of the invention and its problems] In piping such as the main system line of a plant, the interior of the piping gradually deteriorates due to aging during operation and various other causes, leading to erosion and collage gas. There is a lot of danger that this could lead to leakage of internal fluid or damage to piping.

However, in the past, there was no other way to check for corrosion inside the piping than to inspect and investigate it during periodic inspections. If damage occurs, it immediately leads to radioactive contamination, so it is possible to grasp the corrosion situation on one side of the piping, such as the main system line, at any time during operation without waiting for periodic inspections, and to check the operating conditions. There has been a strong demand for a method that can be used as study material and predict the timing of repairs.

[Purpose of the invention]

This invention was developed in response to my own request, and is always connected (2) in parallel to the main system line piping of the plant, so that the main The purpose is to provide parallel piping that is useful for checking the health of main system lines, etc. by supplying samples that can be used to determine the corrosion state of the inner surfaces of pipes such as system lines.

[Summary of the invention]

Parallel piping is connected in parallel to the main system line piping in the middle of the important main system line of the plant, and during continuous plant operation, the parallel piping is supplied with fluid under the same conditions as the main system line piping. Let it flow. A part of the parallel piping is designed to be detachable so that it can be removed and inspected at any time as a sample piping for inspection and investigation. Furthermore, in consideration of the time when the test pipe is removed, stop valves are installed on the upstream and downstream sides of the test pipe, and when the test pipe is removed, the fluid inside the test pipe is discharged. A drain pipe will be provided for this purpose.

If you want to understand the state of deterioration of the inner surface of the main system line piping, close the stop valves installed on both sides of the test piping that forms part of the parallel piping at any time, regardless of plant operation, and remove the removable pipes. The purpose is to extract test piping, inspect and investigate the test piping, and use the results to infer the state of deterioration of the inner surface of the main system line piping and obtain data for considering operating conditions, repair timing, etc. be.

[Embodiments of the invention]

An embodiment of parallel piping according to the present invention will be described with reference to the drawings.

In the middle of piping 1 that constitutes the main system line etc. to be monitored in the plant, parallel piping 2 of the same material and dimensions as piping 1 is placed in parallel to the piping 1, so that the flow state of the fluid flowing inside the piping is that of the main system line. Connect so that it is the same as 1. The parallel piping 2 has a test wiring v3 which has a structure that can be detached by flange connection so that a part of the parallel piping 2 can be separated and removed from the parallel piping 2 when inspecting or investigating the deterioration state inside the parallel piping 2. Further, stop valves 4 are provided on the upstream and downstream sides of the test pipe 3, and a drain pipe 5 is provided for discharging the fluid inside the test pipe 3 when the test pipe 3 is removed. will be established.

If you want to know the corrosion state inside the main system line piping 1 during plant operation, etc., close the stop valve 4, open the drain pipe 5, drain the fluid inside the parallel piping 2, and connect the flange. Remove the test pipe 3 from the parallel pipe 2, inspect the internal corrosion state of the test pipe 3, and if necessary, take a sample from the test pipe W3. , mechanical strength tests, analysis, etc.
Investigate the state of deterioration of the sample pipe 3. The deterioration state of the main system line pipe 1 is inferred from the investigation results regarding the test pipe 3, and this is used as study material for determining the operating conditions of the main system line, ``repair timing, etc.''

After the investigation is completed, the test piping 3 is repaired and connected as before, and the stop valve 4 is opened to allow fluid in the main system line to flow into the parallel piping 2 as before, and operation is continued.

〔Effect of the invention〕

The parallel piping according to the present invention is as described in detail in section # regarding its embodiment. If the main system line (5) is connected in a long line to the main system line piping, and during continuous operation, fluid is supplied to the parallel piping under the same conditions as the main system line piping. is flowing. If you want to investigate the state of deterioration of the piping in the main system line, leave the main system line running, stop the fluid flow to the parallel piping, and disconnect the removable test piping installed in the middle of the parallel piping. The deterioration condition of the sample piping is inspected and investigated, and the deterioration condition of the main system line piping can be inferred from the results, so the main system line can be inspected at any time without stopping plant operation. It is possible to know the state of deterioration of the main system line, to obtain study materials for operating conditions whenever desired, and to predict when the main system line will be repaired, making it possible to accurately grasp the health of the main system line. effective.

[Brief explanation of the drawing]

The drawing is a configuration diagram of parallel piping in an embodiment of the present invention. 1... Main system piping, 2... Parallel piping, 3... Test piping, (6) 4... Stop valve, 5... Drain pipe. (7317) Agent Patent attorney Kensuke Norichika (and 1 other person) (7)

Claims (1)

[Claims] In the middle of a system line to be monitored in a plant, in parallel piping that is connected in parallel to the piping of that system line so that fluid flows under the same conditions as the piping of that system line, a part of the parallel piping is connected and detached. The test pipe has a flexible structure so that it can be removed for inspection and investigation at any time, and stop valves are installed on the upstream and downstream sides of the test pipe. and a drain pipe for discharging the fluid.