RU2350917C2 - System for strength and density tests of products working under internal pressure - Google Patents

Abstract

FIELD: physics, tests.

SUBSTANCE: invention is related to the field of machine building and may be used for testing of pipeline valves bodies. Technical result is provided by the fact that system comprises table for installation of tested product, in internal cavity of which elastic reservoirs filled with liquid medium are placed prior to air supply. Table is installed in bath with the possibility of its separation into upper and lower parts communicated by pipe. Lower part of bath is filled with water and connected to source of compressed air. Tested product is tightened with plugs equipped with elastic reservoirs with the possibility of liquid supply to them via pipelines from receiver connected to the source of compressed air. At that according to invention receiver is equipped by level indicator, tested item is installed in frame that covers the tightening plugs with elastic reservoirs so that tested product might be installed on table together with plugs and elastic reservoirs, and one of plugs has connection to high pressure pipeline of testing gas medium.

EFFECT: expansion of technological resources and higher qualitative assessment of test.

2 cl, 1 dwg

Description

The invention relates to the field of mechanical engineering, in particular to valve manufacturing, and can be used to test the body of pipe fittings.

A known method of pneumatic testing of products (see RU 2267097 C2, G01M 3/00), including placing one or more elastic containers inside the test product, filling these containers with liquid medium until the containers are straightened and copy the inner surface so that there remains a microgap between them, determined by the size of the microroughness of the inner surface of the test product, after which air is supplied to the test product, raising its pressure to the level stipulated by the regulatory and technical document by stating, for example, 1.5 PP, while the energy intensity of the test medium remains safe.

The disadvantages of this method include the lack of a regulated procedure for filling with liquid medium the internal containers of a complex configuration, if several are required.

A device for sealing flange valves is also known (see SU 1185144 A, G01M 3/08, prototype).

The device contains a table for mounting the test product, mounted on the bottom of the bath, communicated through a pipe with a container with a liquid medium connected to a source of compressed air.

The disadvantages of the known device include the impossibility of testing, for example, the body of pipe fittings for strength and density due to the lack of sealing devices and increased dangerous energy consumption when testing products with air.

The purpose of the invention is the expansion of technological capabilities and improving the quality assessment of the test.

The goal is achieved by the fact that the test product is placed in a frame that covers its sealing plugs with elastic containers connected by means of blocked pipelines to a receiver equipped with a level gauge and connected to a source of compressed air, and the pipelines from the plugs, including their overlapping devices, are designed for the test pressure of the product for durability.

The drawing shows a diagram of a system for testing products operating under pressure for strength and density.

The system consists of a bath 1, divided into two parts by a table 2, on which the test product 3 is installed, sealed with plugs 4, equipped with elastic containers 5, placed in the frame 6, and high pressure pipelines 7 for supplying fluid through controlled taps 8 from the receiver 9 provided a level gauge 10 and connected to the compressed air source by the pipe 11. The lower part of the bath 1 is connected to the upper part by the pipe 12, filled with liquid medium 13 and communicated with the compressed air source by the pipe 14. Moreover, one of plugs 4 has a connection with the pipeline 15 high pressure test gas environment, such as air.

The system operates as follows.

Preparation of the product for testing.

Outside the bath, plugs 4 with empty elastomeric containers 5 are installed in the test product 3 and placed in the frame 6. Then, the assembled assembly is placed on the table 2 of the bath 1 and connected with pipelines 7 and 15. The product is ready for testing.

Testing.

Through the pipe 11, compressed air is supplied from the network to the receiver 9 and through the pipes 7, the liquid enters through the plugs 4 into the elastic containers 5, straightening them and filling the entire internal volume of the tested product 3. Moreover, the supply is carried out simultaneously in all elastic containers, which allows them to straighten and occupy the maximum volume of the internal cavity of the test product.

After that, the cranes 8 block the pipelines 7, and only after that, high pressure air is supplied through the pipe 15, which fills the remaining micro-gap between the opened elastic containers 5 and the wall of the test product 3, the energy intensity of such a volume becomes safe, therefore the pressure corresponds to Rp according to the requirements of regulatory and technical documentation. When the required pressure is reached, the pipeline 15 is closed.

For an objective assessment of the strength and density of the material of the wall of the product working under internal pressure, through the pipe 14 we supply compressed air to the lower part of the bath 1. Liquid medium 13, water or a special liquid with surfactants, is displaced through the pipe 12 and fills the volume of the upper part of the bath 1. After covering the entire surface of the test product, visual bubble control is performed for the time provided by the normative and technical documentation.

If leaks are detected (bubbles exit through the walls of the test product), defective spots are noted by any of the known methods.

After the inspection through the pipelines 11 and 14 in communication with the atmosphere, the test medium 13 through the pipe 12 enters the lower part of the bath 1, and when the taps 8 are opened, the high-pressure air located in the inner cavity of the test product 3 extrudes the liquid medium through the pipelines 7 from elastic containers 5 into the receiver 9. Then the valves 8 are closed, the pipelines 7 and 15 are disconnected, and the product under test 3 is dismantled together with the frame 6.

The tests are over.

Thus, due to the use of plugs with elastic containers, connected by a piping system to the receiver, it allows to simultaneously fill the internal cavity of the tested product and to completely control the filling process through the measuring tube of the receiver, and due to the fact that the air volume inside the tested product has a safe energy consumption, combine the tests for strength and density of the material, and due to the fact that the process of immersion of the test product in a liquid medium occurs by transferring infusion of the last from the bottom of the bath with compressed air from the network allows it to be performed repeatedly and at any speed, because It is known that the most effective bubble method is noticeable at the “solid-liquid-gas (air)” interface; control is enhanced when used as a liquid medium, for example, water with the addition of surfactants. All of the above, of course, improves the quality assessment of product testing, reduces labor costs and expands the technological capabilities of the system.

Claims (2)

1. A system for testing the strength and density of products working under internal pressure, comprising a table for mounting the test product, in the internal cavity of which, before air supply, elastic containers are placed filled with liquid medium, and the table for mounting the test product is installed in the bath with the possibility of dividing it into the lower and upper parts communicated by the pipe, the lower part of the bathtub is filled with water and connected to a source of compressed air, the tested product is sealed with plugs equipped with electric acoustic containers with the ability to supply liquid to them through pipelines from a receiver connected to a source of compressed air, characterized in that the receiver is equipped with a level gauge, and the test product is placed in a frame that covers its sealing caps with elastic containers with the possibility of mounting the test product with plugs and elastic containers in a frame on the table, while one of the plugs is connected to a high pressure pipeline of the test gas medium. 2. The system according to claim 1, characterized in that the pipelines from the plugs, including their overlapping devices, are designed for the pressure test of the product for strength.