SU1486835A1 - Device for testing for air-tightness of pipeline joints - Google Patents

Description

The invention relates to a device for testing the tightness of pipeline connections operating with cryogenic fluids or at low temperatures. The device allows you to expand the operational capabilities by testing the angular joints of pipelines with shells. Device content2

living detachable for forming a cylindrical annular chamber 1 with brackets 2 fixed on it with loaders 3, made in the form of bolts, and placed at its bottom with the possibility of interaction with loaders 3 by a detachable elastic flange 4 with holes 5 along its perimeter from the side, opposite to the loaders 3, an annular seal 6 with an oblique transverse section is installed, a source of heat agent connected by nozzles 7 with an annular chamber 1, an indicator gas accumulation chamber with an aperture and installed along e a perimeter sealing ring 6, made in the form of a flexible membrane covering the annular chamber 1 and fastened to the connectors 7 by means of the bellows 9 and Connecting cable § nyaemy accumulation chamber 8 to the leak detector.

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The invention relates to a device for testing the tightness of pipelines working with cryogenic fluids or at low temperatures.

The purpose of the invention is the expansion of the operational capabilities of the device by testing the corner joints of pipelines with shells.

The drawing shows the proposed device. The device contains a detachable for forming a cylindrical annular chamber 1 with brackets 2 mounted on it with loaders 3, made in the form of bolts, and placed at its bottom with the ability to interact with loaders 3 by a detachable elastic flange 4 with holes 5 along its perimeter from the side opposite to the loaders 3, an o-ring 6 is installed with an oblique transverse section (not shown), a source of heat agent (not shown) connected by nozzles 7 with an annular chamber 1, an accumulation chamber 8 indicator th gas with a hole and mounted around the perimeter of the annular seal 6, made in the form of a flexible membrane covering the annular chamber 1, and fixed to the nozzles 7 by the bellows 9 and is connected to the accumulation chamber 8 leak detector (not shown).

The device works as follows.

In the area of the test corner connection 10 of the pipe 11 with the shell 12, a split annular chamber 1 is installed so that the seal 6 of the elastic flange 4 contacts the shell. Around the annular chamber 1, an accumulation chamber 8 made of flexible hermetic heat-resistant shell (for example, of metallized lavsan film) is installed, hermetically fixed on the nozzles 7 by means of bellows 9 and clamping elements 13. The accumulation chamber 8 is sealed on pipeline 1 by clamping elements 14, and 12 - an annular seal 6 mounted on an elastic flange 4 deformed by the shape of the shell 12 and pressed to it by loaders 3 Fill the pipeline 11 and the shell 12 with indicator gas under the hull accurate pressure. In the annular chamber 1 through the pipes 7 from the external source serves heat agent (for example, liquid nitrogen during the cooling tests). If there are end-to-end defects in the test corner joint, the indicator gas will flow through -5 holes in the elastic flange 4 into the accumulation chamber 8 connected to the leak detector, according to the indications of which the tightness of the joint is evaluated at the test temperature.

The device allows you to test compounds at high temperatures, for which hot air is used as a heat agent.

The use of a flexible shell for the manufacture of the accumulation chamber makes it possible to use simple types of seals of its joints with the test product, which have low requirements for tightness, since the permissible deformations of the shell compensate for the gas pressure drops in the accumulation chamber during the tests. In addition, it allows bringing the heat agent directly to the test zone, which provides a wide range of temperature change rates.

The use of a detachable elastic flange with a seal, spatially deformed by the loaders in the form of the tested area of the product, allows to transfer evenly distributed pressing forces to the junction of the accumulation chamber shell with the surface of the product, ensuring the required level of its sealing.

The bellows, hermetically fixed on the accumulation chamber and thermal agent supply nozzles, provide additional mobility of the chamber shell, which allows reducing its free volume and obtaining the required concentration of indicator gas accumulated in the chamber in a shorter temperature exposure time during testing, which saves time and heat agent.

Using the proposed device allows for reliable local. temperature tests for tightness of areas of complex spatial shape.

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Claims (4)

Claim 1. Device for testing the tightness of pipe joints under temperature effects, containing a separable ring-shaped annular chamber, brackets with loaders mounted on the chamber, a heat agent source connected by nozzles to the annular chamber, an indicator gas accumulation chamber with an opening and an annular seal installed around its perimeter and a leak detector connected to it, characterized in that, in order to expand operational capabilities by providing test angles x pipelines with shells, an annular chamber with an elastic flange with openings placed at its bottom capable of interacting with the loaders; an annular seal installed along the flange perimeter on the side opposite to the loaders, and a chamber five ι -ίΟΟΟΟ ¹ Accumulation is made in the form of a flexible shell, covering the annular chamber and attached to the 'nipples. 2. Device by π. 1, characterized in that the ring seal is made with an oblique 5 cross-section. 3. The device according to PP. 1 and 2, characterized in that the attachment of the accumulation chamber to the nozzles is made in the form of bellows. 4. The device according to PP. 1-3, characterized in that the loads are made in the form of bolts.