JPH11148590A - Washing and inspecting device for intra-pipe apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quickly perform washing and inspection of an apparatus installed in a piping in case no washing and inspecting seat is provided in front of and behind the apparatus. SOLUTION: A washing and inspecting device for an intra-pipe apparatus is composed of a washing and inspecting seat 13 installed on the pipe wall near an apparatus 12 installed inside a piping 10 in such a way as aslant to the apparatus and leading to the inside of the piping, guide pipes 15 and 20 which are inserted into the piping from this seat and whose tips are open near the apparatus, a washing element 16 inserted into the piping upon penetrating the guide pipes, and an inspecting member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is intended to enable simple and quick cleaning and inspection of equipment installed inside existing pipes of various plants, for example, flow nozzles (nozzles for detecting a differential pressure of a flow meter). The present invention relates to a cleaning and inspection device for in-pipe equipment.

[0002]

2. Description of the Related Art A flow nozzle is installed inside a main water supply pipe of a nuclear power plant or a thermal power plant, but impurities contained in feedwater adhere to the flow nozzle as a scale due to long-term operation. Causes a measurement error. For this reason, a pair of cleaning inspection seats with a nominal diameter of 80 A or more are provided before and after the flow nozzle in the main water supply pipe, and when the plant is stopped, both the cleaning inspection seats are opened, and the flow using the cleaning inspection seats is performed. Stretch the wire penetrating the nozzle inside the pipe, suspend the washing nozzle on the wire, move the washing nozzle along the wire, remove the scale attached to the flow nozzle with the washing water that the washing nozzle blows out, or suspend the mirror In some cases, it is moved along the wire so that the inside of the flow nozzle can be observed and inspected.

[0003]

However, if such a pair of cleaning and inspection seats are not provided in advance, providing a pair of cleaning and inspection seats in the main water supply pipe requires costly modification of equipment. In addition, since the nominal diameter is 80A or more, it must pass a pressure test by a regulatory agency after modification. Therefore, if a pair of cleaning inspection seats is not provided in advance, it is necessary to cut the main water supply pipe before and after the flow nozzle to remove the scale attached to the flow nozzle, and to restore the cut main water supply pipe after the inspection. But it has one
It requires a construction period of about a week and is very troublesome. In addition, scale is removed by washing with a chemical, but large-scale construction is required.

[0004]

SUMMARY OF THE INVENTION The present invention is directed to a cleaning and inspection apparatus for in-pipe equipment, such as a flow nozzle, developed to solve the above-mentioned problems. A washing / inspection seat provided on a wall at an angle to the device and communicating with the inside of the pipe, a guide pipe inserted into the pipe from the washing / inspection seat, and having an open end near the device; A cleaning member inserted through the pipe and inserted into the pipe, and an inspection member are provided.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the illustrated embodiment, 10 is a pipe such as a main water supply pipe, and 12 is a flow nozzle as equipment installed in the pipe. An opening 11 is formed in the pipe 10 near the flow nozzle in front of or behind the flow nozzle 12, and an opening 11 is formed obliquely in the direction of the flow nozzle.
The distal end of the cylindrical cleaning inspection seat 13 is welded and fixed obliquely so as to be concentric with 1. The fact that the opening 11 is formed in the pipe wall obliquely in the direction of the flow nozzle does not mean that the extension of the center line of the opening 11 and the cleaning inspection seat 13 reaches the flow nozzle. As shown in FIG. 1, this means an oblique direction that makes it easier for the leading ends of the cleaning member and the inspection member to reach the flow nozzle.

[0006] The nominal diameter of the cleaning inspection seat 13 is set to 50A or less which does not need to undergo a pressure test by a regulatory agency. Then, a flange 14 is fixed to the rear end by welding.

Reference numeral 15 denotes a guide pipe of a stainless steel pipe through which a cleaning member 16 is reciprocally pierced. The cleaning member accommodates a flexible high-pressure hose 17 and a front portion of the high-pressure hose therein. A linear cylinder 18 slidably fitted on the inner periphery of the front straight portion 15a, and a cleaning which is attached to the front end of the cylinder 18 and communicates with the front end of the high-pressure hose, and which jets high-pressure cleaning water from around. It is composed of a nozzle 19 and a well-known high-pressure water supply device (not shown) including a pressure pump, a pressure tank, and the like for supplying high-pressure washing water from the rear end into a high-pressure hose.

Reference numeral 20 denotes a guide pipe made of a stainless steel pipe through which an inspection member 21 is reciprocally movable. The inspection member accommodates a flexible fiberscope 22 and a front portion of the fiberscope therein. Front straight part 2
0a, a straight cylindrical body 23 slidably fitted on the inner circumference,
It is attached to the front end of the cylindrical body and is constituted by an objective lens 24 connected to the front end of the fiberscope. A visual observation unit 25 having an eyepiece is provided at the rear end of the fiberscope.

The guide tubes 15 and 20 are shown in FIGS. 1 (A) and 1 (B).
As shown in FIG. 5, the curved portions 15 'and 20' are provided in the middle, but the outer diameter thereof is sufficiently smaller than the inner diameter of the cleaning inspection seat 13, so that the bending portions 15 'and 20' are located inside the cleaning inspection seat. Can pass through. And guide tubes 15, 20
Is inserted from the cleaning inspection seat 13 into the inside of the pipe 10, and a flange 26 provided at the rear end of the rear straight portion 15b, 20b of each guide tube is brought into contact with the flange 14 of the cleaning inspection seat, and bolts, nuts and the like are used. When joined and fixed, each guide tube 15,
The front straight portions 15a, 20a of 20 are the center line CL of the pipe.
, The opening at the tip thereof approaches the flow nozzle 11.

[0010] The cylindrical members 18 and 23 are provided on the curved portion 1 of the guide tube.
Since they cannot pass through 5 'and 20', the high-pressure hose 17 of the cleaning member and the fiberscope 22 of the inspection member penetrate the guide tube from the front end of the guide tube, and the cylinders 18 and 23 are inserted into the front straight portions 15a and 20a of the guide tube. Position.

FIG. 1A shows a state in which the guide tube 15 through which the cleaning member 16 has passed is inserted into the inside of the pipe 10 from the cleaning inspection seat 13 as described above, and the flange 26 at the rear end of the guide tube 15 is connected to the cleaning inspection seat. The high pressure water is supplied from the high pressure water supply device to the high pressure hose 17 while the high pressure hose is pushed in or pulled in so as to move the cleaning nozzle 19 forward and backward inside the flow nozzle 12 to clean the nozzle. This shows a state in which the inside of the flow nozzle is washed with high-pressure washing water spouting from around the nozzle 19 to remove attached scale. The washing nozzle 19 accommodates the front portion of the high-pressure hose therein and is attached to the front end of the linear cylindrical body 18 slidably fitted on the inner periphery of the front straight portion 15a of the guide tube. By pushing and pulling the hose, the cylinder 18
With the center line CL of the pipe 10. Therefore, the length of the front straight portion 15a of the guide tube 15 and the length of the cylindrical body 18 are determined according to the length of moving the cleaning nozzle 19 forward and backward,
The rear end of the cylindrical body 18 is prevented from falling out of the front end of the guide tube even when the cleaning nozzle is advanced most.

After the cleaning as described above, the flange 26 at the rear end of the guide tube 15 is detached from the flange 14 of the cleaning inspection seat, and the cleaning member together with the guide tube is pulled out of the cleaning inspection seat. Check cleaning conditions.

FIG. 1B shows a state in which the guide tube 20 through which the inspection member 21 has passed is inserted into the inside of the pipe 10 from the cleaning inspection seat 13 as described above, and the flange 26 at the rear end of the guide tube 20 is attached to the cleaning inspection seat. The objective lens 24 is advanced and retracted inside the flow nozzle 12 by joining and fixing to the flange 14 of the
This shows a state where the inside of the washed flow nozzle is inspected from the visual observation unit 25 at the rear end of the fiber scope. The objective lens 24 accommodates the front part of the fiberscope therein and is attached to the front end of the linear cylindrical body 23 slidably fitted on the inner periphery of the front straight part 15a of the guide tube. With the push-pull of the pipe 10, it advances and retreats along the center line CL of the pipe 10 integrally with the cylinder 23. Therefore, also in this case, the front straight portion 2 of the guide tube 20
0a and the length of the cylindrical body 23 are determined in accordance with the length of moving the objective lens 24 forward and backward.
3. Make sure that the rear end of the guide tube does not fall out of the front end of the guide tube.

In this way, the inside of the flow nozzle is inspected. If cleaning is insufficient, the flange 26 at the rear end of the guide tube 20 is detached from the flange of the cleaning inspection seat, and the inspection member together with the guide tube is pulled out of the cleaning inspection seat. Then, the cleaning is performed again as described in the aforementioned paragraph 0010 (see FIG. 1A), and after the cleaning is completed, the inspection is performed again as described in the aforementioned paragraph 0012 (see FIG. 1B), and the cleaning is completed. Repeat this until done.

When it is confirmed by inspection that the inside of the flow nozzle has been completely cleaned, the inspection member together with the guide tube 20 is pulled out of the cleaning inspection seat, and the opening 11 of the pipe wall and the cleaning inspection seat 13 are drawn. As shown in FIG.

The stopcock shown is a cap barrel 28 abutting the flanged end 13 'of the wash access seat 13 and a central rod extending from the closed upper end of the cap and protruding deep into the wash access seat. When the cap cylinder is fixed to the end of the center rod 29 and the cap cylinder comes into contact with the end of the washing inspection seat, the opening 11 of the tube wall and the plug 30 fitted to the tip of the washing inspection seat are formed. The distal end fitted to the opening 11 of the plug has a curved surface 30 'that matches the inner circumference of the pipe 10, as shown in FIG.

In order to attach the stopper 27, the welded portion of the flange 14 welded to the cleaning inspection seat 13 is melted to remove the flange, and the plug 30 and the center rod 29 are inserted into the cleaning inspection seat to wash the cap cylinder 28. It contacts the end 13 'of the inspection seat. As a result, the plug 30 fits into the opening 11 and the tip of the cleaning inspection seat, and the curved surface 30 ′ at the tip of the plug matches the inner peripheral surface of the pipe 10. The end 13 'of the seat is welded and the stopper is secured to the wash access seat.

Next, at the time of cleaning, the welded portion between the cap cylinder 28 and the end 13 'of the cleaning inspection seat is melted, the stopper 27 is pulled out from the cleaning inspection seat, the flange 14 is welded to the end 13' and again. Secure and clean and inspect as described above.

The inspection member 21 penetrating the guide tube 20
Can be used to check whether or not the scale has adhered to the inside of the flow nozzle so that cleaning is necessary, in addition to checking the cleaning state of the flow nozzle after cleaning.

As the washing nozzle, one having four injection holes having a diameter of 1 mm at equal intervals in the circumferential direction is used, and washing water having a pressure of about 20 MPa is supplied to a high-pressure hose at about 30 liters / min. The vertical cleaning water was able to completely remove the scale of the flow nozzle.

[0021]

As is apparent from the above, according to the present invention, when a pair of cleaning inspection seats is not provided before and after the equipment installed in the pipe, the front and rear of the equipment installed in the pipe are not provided. By providing only one cleaning inspection seat communicating with the inside of the pipe diagonally toward the device on the nearby pipe wall, the guide pipe penetrated by the cleaning member or the guide pipe penetrated by the inspection member can be inclined as described above. It is inserted into the pipe from the cleaning inspection seat, and the cleaning and inspection of the equipment in the pipe can be performed easily and in a short time, and the equipment installed in the pipe can be easily maintained. And, by reducing the nominal diameter of the cleaning inspection seat, the remodeling is easy, and it is not necessary to undergo a pressure test by a regulatory agency.

[Brief description of the drawings]

FIG. 1A is an explanatory view of a cleaning state by the apparatus of the present invention, and FIG. 1B is an explanatory view of an inspection state in the same manner.

FIG. 2A is an enlarged cross-sectional view showing a state in which a cleaning inspection seat is closed after cleaning and inspection are completed, and FIG. 2B is a front view of the same with a cross section of a pipe.

[Explanation of symbols]

 Reference Signs List 10 pipe 11 pipe wall opening 12 equipment installed in pipe (flow nozzle) 13 cleaning inspection seat 14 cleaning inspection seat flange 15 guide tube 16 cleaning member 17 high pressure hose of cleaning member 18 cylinder 19 cleaning nozzle 20 guide Pipe 21 Inspection member 22 Fiberscope of inspection member 23 Cylindrical body 24 Objective lens 25 Visual observation part 26 Flange of guide tube 27 Closure stopper for cleaning inspection seat

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Osamu Nebu, Inventor 120 Oiso, Izumi, Haramachi, Fukushima Prefecture Tohoku Electric Power Co., Inc. General Technical Training Center (72) Inventor Manabu Okamoto 5-2-2, Minato, Miyagino-ku, Sendai, Miyagi Prefecture -1 Tohoku Electric Power Co., Inc. Shin-Sendai Thermal Power Station (72) Inventor Takashi Iwai 2-2-22 Kitahama, Chuo-ku, Osaka City, Osaka Kurita Engineering Co., Ltd.

Claims (1)

[Claims] A cleaning inspection seat is provided on a pipe wall in the vicinity of a device installed in a pipe and is provided at an angle toward the device and communicates with the inside of the pipe. A cleaning and inspection device for in-pipe equipment, comprising: a guide pipe having an open end near the equipment, a cleaning member penetrating the guide pipe and inserted into the pipe, and an inspection member.