JPH023141Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pressure resistance test jig for a nozzle attachment portion of a pressure vessel, and more particularly to a jig that can perform a pressure resistance test without welding the jig to the pressure vessel body.

Conventionally, when a nozzle is attached to a large pressure vessel by welding, etc., pressure tests for partially repaired parts such as welds are performed by filling the entire pressure vessel with water and applying pressure, or by welding a test jig to the main body. However, a partial pressure test was conducted by filling the test jig containing the repaired area with water. In this type of pressure test, if a jig is not used,
There are disadvantages in that a large amount of water is required to fill the large container with water, and when a test jig is used, the jig is welded to the pressure vessel, which requires labor and time.

SUMMARY OF THE INVENTION An object of the present invention is to provide a pressure test jig that overcomes the above-mentioned drawbacks of the prior art and is capable of carrying out a pressure test of a repaired part of a nozzle mounting portion without welding the jig to the pressure vessel body.

The present invention is a jig for testing the pressure resistance of a nozzle attachment part of a pressure vessel main body, and includes a flange part provided on the nozzle and another flange part that comes into contact with the flange part via a sealing member. and a pipe that is removably inserted into the nozzle, and a pipe that protrudes into the pressure vessel, and
A cover whose peripheral edge abuts against the inner wall of the pressure vessel via a sealing member, and a tightening mechanism that secures the cover to the protruding end of the pipe and sufficiently seals the flange and the peripheral edge of the cover. It is characterized by having a means.

In this invention, the material of the test jig is as follows:
It is not particularly limited as long as it has the strength to withstand a pressure test. In addition, as sealing members, various gaskets used for the purpose of maintaining airtightness,
A gasket or the like can be used. Furthermore, the cover that covers the open end of the pipe has a fixing means such as a screw hole for fixing to the end of the pipe, and has a shape in which the peripheral edge is in close contact with the inner wall of the pressure vessel via the sealing member. It is fine as long as you have it.

Hereinafter, the present invention will be explained in more detail with reference to the embodiment shown in FIG.

In FIG. 1, this pressure test jig includes a flange part 3 provided integrally with a nozzle 2 attached to a pressure vessel main body 1 by a welding part 10, and a seal member 4 connected to the flange part 3. A pipe 6 having another abutable flange portion 5 and detachably inserted into the nozzle 2 and an end portion of the pipe 6 protruding into the pressure vessel 1 are covered,
A cover 8 whose peripheral edge abuts against the inner wall of the pressure vessel 1 via a seal member 7, the cover 8 being fixed to an end plate 11 provided at the protruding end of the pipe 6, and the flange portion 3, 5 and a tightening means 9 (in this case, an embedded bolt or nut installed on the end plate 11 of the pipe 6) for sufficiently sealing the peripheral edge of the cover 8. Note that 11a is a water injection hole, and 13 is a tightening bolt for the flange portions 4 and 5.

In the above configuration, in order to perform a pressure resistance test of the nozzle attachment part (especially the welded part 10) of the pressure vessel 1,
The pipe 6 of the pressure test jig of the present invention is attached to the nozzle 2.
is inserted, the flanges 4 and 5 are matched with each other via the seal member 4, and the cover 8 of the test jig is placed over the end plate 11 of the end of the pipe protruding into the pressure vessel, so that the peripheral edge of the cover is The cover 8 is tightened by bolts and nuts installed upright on the end plate 11 of the pipe 6 so as to contact the inner wall of the pressure vessel via the seal member 7, and further tightened by tightening the bolts and nuts. The peripheral edge of the pipe is strongly pressed against the inner surface of the pressure vessel main body 1 via the seal member 7, and the flange portion 5 of the pipe is strongly pressed against the nozzle flange portion 3 via the seal member 4 to ensure a sufficient seal. The pressure test is carried out by attaching the test jig to the nozzle attachment part of the pressure vessel as described above, and then inserting water into the water injection hole 1 provided in the end plate 11 of the pipe 6 of the test jig.
Pressurized water is injected from 1A and maintained at a predetermined pressure for a certain period of time to perform a pressure resistance test of the welded portion 10 and the like.

In the above embodiment, by using a pipe as a test jig and providing a simple tightening means, the capacity of the test jig can be reduced and tightening can be performed without increasing the number of tightening bolts. Advantages include that the test can be carried out uniformly and that the pressure test can be carried out in a short time without welding a jig to the pressure vessel body.

In the above embodiment, a vent hole is provided in the upper part of the test jig cover 8 for venting air, and after venting the air, a plug can be screwed in to form a sealed structure. Further, the water injection hole 11A of the pipe 6 may be provided with a connection for injecting water and connected to a hose.

As described above, according to the present invention, a pressure resistance test can be easily performed without welding a jig to the pressure vessel main body.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a pressure test jig showing an embodiment of the present invention. In the figure, 1 is a large pressure vessel;
2 is a nozzle, 3 and 5 are flange parts, 4 and 7 are seal members, 6 is a pipe, 8 is a test jig cover, 9
11 is an end plate, and 11A is a water injection hole.

Claims (1)

[Scope of utility model registration request] A jig for testing the pressure resistance of a nozzle attachment part of a pressure vessel body, comprising a flange part provided on the nozzle and another flange part abutted on the flange part via a sealing member, and a pipe that is removably inserted into the nozzle; a cover that covers the pipe that protrudes into the pressure vessel and whose peripheral edge abuts against the inner wall of the pressure vessel via a sealing member; A pressure test jig for a nozzle attachment part of a pressure vessel, characterized in that the jig has a tightening means that is fixed to the protruding end of the cover and sufficiently seals the flange part and the peripheral edge of the cover.