JPS6155497A - Jig for piping pressure-resisting test - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a method for closing the open end of a piping during a pressure test of a piping system. This invention relates to a closing jig for pressure testing.

[Background of the invention]

The prior art will be explained with reference to FIGS. 4 and 5.

As shown in Figures 4 and 5, conventionally, during piping pressure tests,
A closing plate or a closing cap 2 was welded to the end of the pipe 1 so that the piping 1 was attached in a sealed state.

Therefore, after the piping pressure test, the piping was cut at the L dimension as shown in Figure 1, a bevel was prepared as shown by the imaginary line, and the connecting piping or equipment was welded, which required a large amount of man-hours. .

For this purpose, we have devised a device that seals the piping system without mechanically welding it to the piping.

Incidentally, related devices of this type include, for example, Utility Model Publication No. 59-6311.

[Purpose of the invention]

An object of the present invention is to use a jig structured to exert mechanical tightening force by utilizing the outer periphery of the open end of the piping, so that the piping can be effectively tightened without welding to the piping system by using the piping pressure test pressure. An object of the present invention is to provide a closing jig for pressure-resistant tests that brings a sealed state into a sealed state.

[Summary of the invention]

The present invention is designed to attach a closing cap to the end face of the piping in order to create a mechanically good sealing state against the pressure test pressure of the piping, and to prevent the closing cap from being pulled out due to the force of the pressure test pressure. By providing a device with a structure that can effectively exert the piping surface friction force and the piping clamping force between the outer peripheral surface of the piping and the end of the closing cap, the force due to the pressure test pressure and the force to prevent the closing cap from being pulled out are always in a balanced state. A jig with a structure that allows

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

The structure of the present invention is as shown in FIG. 1, 1 is a pipe, 2 is a closing cap, 3 is a packing, 4 is a bolt for tightening, 5 is a fastening nut, 6 is a connecting bar, 7 is a tightening ring, and 8 is a tightening nut. The piping holding piece 9 is composed of an elastic ring and JO is a friction body.

To seal the piping, a closing cap 2 fitted with a gasket 3 is inserted into the end of the piping I.

In addition, on the outer periphery of the pipe 1, several pipe holding pieces 8 having a tapered outer surface and having a friction body 10 fixed to the inner surface are attached to an elastic ring 9. A tapered tightening ring 7 is attached.

Further, a connecting bar 6 whose one end is fixed to a tightening nut 5 is attached to the tightening ring 7, and a mounting bolt 4 is attached to the tightening nut 5 so as to be in contact with the closing cap 2.

Since the present invention is constructed as described above, by tightening the tightening bolt 4 to match the force due to the pipe pressure test pressure, this bolt tightening force is transmitted through the tightening nut 5 and the connecting bar 6. It is transmitted to Ring 7.

Here, since the tightening ring 7 and the pipe holding piece 8 are in contact with each other on the tapered surface, slippage occurs on this surface.On the other hand, the pipe holding piece 8 has the M ring body 10 fixed to its inner surface and is in contact with the pipe 1. Therefore, the bolt tightening force is converted into a pipe tightening force by the tightening ring 7 and the pipe holding piece 8.

Therefore, when the tightening bolt 4 is tightened, the bolt end presses down the closing cap 2 attached to the pipe end, and this bolt tightening force is applied to the outer circumferential surface of the pipe by the tightening ring 7 and the pipe holding piece 8. Since it presses down, a good seal can be obtained.

[Effects of the Invention] According to the present invention, a pressure test can be performed without welding to the piping itself, and it can be used repeatedly, resulting in the following effects.

(1) Welding using conventional methods is no longer necessary, resulting in a total reduction in man-hours.

(2) After the pressure test is completed, the manufacturing process of cutting the welded portion of the closing plate and machining the beveling is eliminated, and the beveling can be manufactured in a factory.

[Brief explanation of drawings]

Fig. 1 is a front view showing one embodiment of the present invention, Fig. 2 is an assembly diagram of a pipe holding piece, an elastic ring, and a friction body which are some of the constituent parts of the present invention, and Fig. 3 is a diagram of the structure shown in Fig. 2. Detailed views, FIGS. 4 and 5 show the front view of the conventional closing plate system and closing cap system 4... Tightening bolt, 5... Tightening nut I, 6... Connecting bar 7. ...Tightening ring, 8
...Piping holding piece, 9...Elastic ring, 10...
Friction body.

Claims (1)

[Claims] 1. In a structure in which a valve or a closing plate is fixed by welding to the open end of the piping, the piping system is made airtight, pressure is applied, and the open end of the piping is sealed in a test to confirm leakage, etc., and the piping system is mechanically sealed. A piping pressure test jig characterized by: