RU2597672C1 - Test bench for pipeline valves of wafer design - Google Patents

Abstract

FIELD: test equipment.

SUBSTANCE: invention relates to testing equipment in machine building, and can also be used in power engineering, chemical and oil and gas industries at enterprises producing inspection and repair of pipeline valves. Test bench comprises fixed 1 and moving 2 faceplates, centering elements 3, a power drive of the fixed faceplate, a test pressure source, two plugs 4 of branch pipes of the pipeline valves. Each plug 4 comprises case 5 with cylindrical recess 6 made on the outer side, on which there is removable annular disc 7 with the use of sealing elastically deformable ring 8. Disc 7 has blind holes 10, outer radial groove 11 with elastically deformable ring 12 and is fixed by threaded stops 9. In case 5 there are channels 13 for supply and drainage of testing fluid and air drainage, as well as there are upper and lower extension bars in the form of squares 14 and replaceable threaded unions 15. On the open ends of annular discs 7 there are at least three guide conical pins 16.

EFFECT: technical result is creation of a test bench with expanded functional capabilities when testing different typical sizes and shapes of internal surfaces of branch pipes of pipeline valves, as well as simplified design and reduced metal consumption for plugs of the bench.

1 cl, 5 dwg

Description

The invention relates to testing equipment in mechanical engineering and is intended for testing pipe fittings of a flangeless design in its production, and can also be used in the energy, chemical, oil and gas and other industries at enterprises that audit and repair pipe fittings in the process of its hydraulic or pneumatic testing , and can also be used to test various hollow products.

Known removable plug for testing flangeless pipes (USSR author's certificate No. 877180, 1981, F16J 3/10), containing a cover mounted on the pipe end with a sealing element, and retaining rings placed on the pipe and connected with the cover by rods.

The main disadvantages of this removable plug are the structural rigidity, which at high test pressures and pipe diameters will lead to the joint opening and, as a result, the joint between the cover and the pipe will not be ensured, as well as the fact that it is technically difficult to use for testing flangeless pipe fittings.

Known stands for testing valves with rigid controlled plugs (see S.V. Seinov, "Pipe fittings. Research. Production. Repair", UDC 621.646.004.67, M "Engineering", 2002, p. 298, table. 5.6, Fig. IVa, b, c) containing faceplates, the power drive of one of the faceplates and rigid plugs for pipe fittings.

The disadvantages of these stands is that the plugs are made strictly for certain sizes of pipes of the tested pipe fittings and for testing various sizes, a large number of plugs for different sizes of pipes are required and, in addition, structurally, these plugs are complex and metal-intensive.

A well-known stand for hydropneumatic testing of shutoff flange valves (patent for an industrial design of the Russian Federation 71197, 2008, MKPO 10-05), containing a base, fixed and movable racks on the base, end caps with actuators, plates and controls.

The main disadvantage of this stand is that at high test pressures and diameters of the pipe fittings and when using end caps of the stand, the joint can open and, as a result, the joint between the plug and the pipe will not be ensured, as well as the fact that this stand is technically difficult to use for tests of flangeless pipe fittings.

Closest to the technical nature of the claimed test bench is a test bench for pipe fittings wafer version (patent for the invention of the Russian Federation No. 2297610, 2005, G01M 3/08), containing fixed and movable faceplates with spacers, power drive fixed faceplate, the source of the test pressure, two plugs for pipe fittings, each of which contains a housing with a cylindrical groove in which the piston is placed, elastically deformable sealing rings, a fitting and channels for feeding and discharging the test fluid and air drainage.

The main disadvantage of this stand is that the plugs of this stand are made strictly for certain sizes of pipes of the tested pipe fittings, depending on its nominal pass, for example, (DN 100, 150, 200, 250, 300, 400, 500 mm) and conditional pressure ( PN 4.0; 6.3; 10; 12: 16; 20; 24; 32 MPa) and for testing various sizes, a large number of plugs are required for different sizes of pipes and, in addition, structurally, these plugs are metal-intensive and complex, including including the design of channels for supplying and draining the test fluid, etc. Air enazha.

It is problematic to use this stand at an enterprise that performs inspection and repair of pipe fittings of domestic and foreign production with DN and PN in the wide range indicated above, due to the fact that for each conditional passage of pipe fittings at the enterprise it is necessary to have about 10 plugs with different mating dimensions of the piston with the inner diameter of the nozzles, because this diameter of the nozzles is made depending on the conditional pressure.

In addition, enterprises producing pipe fittings, including foreign ones, have not always performed before and are currently performing the inner diameter of the pipe of strict size and shape. Often, the inner diameter of the nozzle can fluctuate within ± 2 mm within the same conditional passage and pressure and can have narrowing conical transitions located from the end of the nozzle at a distance of 20 mm, which makes it almost impossible to use the above stand, because first, between the outer surface of the piston plug and the inner diameter of the nozzle when using rubber o-rings there should be a gap in the range of 0.04 ... 0.15 mm depending on pressure (see L.A. Kondakov et al. “Seals and gaskets “Technique. Reference book”, UDC 62-762 (035), M. “Mashinostroenie”, 1986, p. 127, table 3.10), and secondly, when installed, the plug piston can abut against a narrowing conical transition on the inside the surface of the pipe to the entrance of an elastically deformable sealing ring.

The task of the claimed invention is to eliminate the above disadvantages, namely expanding its functionality when testing various sizes and shapes of the inner surfaces of the pipe fittings, as well as simplifying the design and reducing the metal consumption of the plugs of the stand.

The technical result of the solution of this problem is that in a test bench for wafer-type pipe fittings, containing a fixed and movable faceplate with spacer elements, a fixed faceplate power drive, a test pressure source, two plugs for pipe fittings, each of which contains a body with a cylindrical undercut in which the piston, elastically deformable sealing rings, fittings and channels for supplying and draining the test fluid and the core are placed air press according to the invention:

- the plug housings are made for one conditional passage of pipe fittings, while the cylindrical grooves are made on the outside of the cylindrical part of the plug housings;

- the pistons are fixed in the form of removable annular disks for various sizes of pipe fittings installed using radial elastically deformable sealing rings on the outer cylindrical grooves of the housings and threaded stops fixed to them from axial displacement, and the outer cylindrical surface of the replaceable annular disks has radial grooves for elastically deformable O-rings and made with the possibility of interfacing with the inner surfaces of the test tubes melted pipe fittings with an allowable gap ensuring tightness of the radial seal by elastically deformable rings;

- channels for supplying and draining the test fluid and air drainage are made only in the housings and have upper and lower extensions in the form of elbows and replaceable fittings, placed on the open ends of the replaceable ring disks and installed with a gap relative to the inner surfaces of the pipes of the tested pipe fittings.

In addition, to facilitate installation and improve the accuracy of fixation of pipe fittings in the stand, at least three guide conical pins are installed on the open ends of the interchangeable ring disks, the largest external diametrical surface of which is combined with the external diametrical surface of the interchangeable ring disks.

Such a constructive implementation of the test bench allows you to complete the bench in the manufacture and delivery to the consumer for each conditional pass with only one pair of metal-intensive, but structurally simple cases of plugs, and replaceable ring disks, which are structurally simple, not metal-intensive and do not exceed 20 mm in thickness, to produce the enterprise operating the stand, as necessary after measuring the actual size of the inner diameter of the pipe nozzle of the tested pipe fittings, taking into account its shape. For modern repair enterprises that perform inspection and repair of pipe fittings and have universal lathes and equipment for manufacturing rubber rings from crude rubber compounds, it is quite possible to make replaceable ring disks and rubber seals.

Extenders in the form of elbows and replaceable fittings, placed on the open ends of the replaceable annular disks and installed with a gap relative to the inner surfaces of the nozzles of the tested pipe fittings, allow the pipe fittings to be filled with test fluid during hydraulic tests, as the air gap in the upper part of the nozzle remains minimal when filling. In addition, when draining the hydraulic fluid after hydraulic testing, the lower extension allows the most complete drainage of the liquid when it is supplied through the upper channels and the upper extension of compressed air.

The invention is illustrated by drawings, where in FIG. 1 shows the structure of a test bench, FIG. 2 shows a section through one of the plugs for sealing pipe fittings, FIG. 3 shows a view of A, and in FIG. 4 and FIG. 5 shows the elements of the plugs.

The test bench for wafer-type pipe fittings contains a fixed 1 and a movable 2 faceplates, spacer elements 3, a fixed-plate power drive and a test pressure source (not shown conventionally in the drawings), two plugs for 4 pipe fittings. The spacer elements 3 are rigidly connected to the plugs 4, for example, by welding, and are attached to the faceplates 1 and 2 using standard fasteners (bolts, studs, nuts). Each plug 4 includes a housing 5 with a cylindrical recess 6, made on the outside of the cylindrical part of the housing, and the housing of the plug is made under one conditional passage of pipe fittings. A removable annular disk 7 is mounted on the cylindrical recess 6 using a radially elastically deformable sealing ring 8. The disk 7 is fixed from axial displacement by the threaded stops 9 and has blind threaded holes 10 for removing the annular disk 7 from the housing 5. The outer cylindrical surface of the removable annular disks 7 has radial grooves 11 for elastically deformable sealing rings 12 and is configured to mate with the inner surfaces of the nozzles of the tested pipe arm rounds with an acceptable gap ensuring tightness of the radial seal by elastically deformable rings 12. In the housing 5 channels 13 are provided for supplying and draining the test fluid and air drainage, and the upper and lower extensions in the form of squares 14 and interchangeable are installed on the open ends of the interchangeable ring disks 7 threaded fittings 15, with the fitting 15 installed with a gap "a" relative to the inner surfaces of the pipes of the tested pipe fittings. At the open ends of the interchangeable annular disks 7, at least three guide conical pins 16 are installed, the largest outer diametrical surface of which is combined with the outer diametrical surface of the interchangeable annular disks.

The test bench works as follows.

The first stage is preparatory work.

Before starting the test, preparation and inspection of the internal surfaces of the pipe fittings to be tested are carried out, namely, a check is made for the absence of dents and deep scratches, the internal edges are cleaned, dulled with a radius of ~ 0.5 mm and the actual diameters are measured, and if there are conical transitions measures the length of the cylindrical part of the inner surface of the nozzles. Then, a removable annular disk 7 is selected, and in the absence, a radial clearance between the outer surface of the disk 7 and the inner diameter of the pipe fittings should be depending on the test pressure within 0.04 ... 0.15 mm, and the width of the disk 7 should be no more than the length of the cylindrical part of the inner surface of the nozzles. Next, the disk 7 with the ring 12 is mounted on the cylindrical recess 6 of the housing 5 using the sealing rings 8 and fixed by the threaded stops 9. Then the fittings 15 and the conical pins 16 are installed. The assembled caps 4 with the spacer elements 3 are mounted on the face plates 1 and 2 of the stand.

The second stage is testing.

Pipe fittings are installed on the stand and pressed against it with faceplates 1 and 2 of the plug 4, while the conical pins 16 ensure the accuracy of pairing of the plugs 4 with the inner surface of the pipe fittings. Then, the internal cavity of the pipe fittings is filled with test fluid through the lower channels 13 of the plugs 4, and air is removed through the upper fittings 15, the square 14 and the channels 13. After filling with test fluid, test pressure is supplied to the internal cavity of the pipe fittings.

At the end of the test, the hydraulic fluid is drained through the lower channels 13, while compressed air is supplied through the upper channels 13 and the upper fitting 15. Then, in the reverse sequence, the pipe fittings, plugs 4 and, if necessary, removable annular disks 7 are removed using blind threaded holes 10.

The use of the claimed invention allows to expand the functionality of the test bench when testing various sizes and shapes of the inner surfaces of the pipe fittings, as well as to simplify the design and reduce the metal consumption of the plugs of the stand.

Claims (2)

1. A test bench for flangeless pipe fittings, comprising a fixed and movable faceplate with spacers, a power drive of the fixed faceplate, a test pressure source, two plugs for pipe fittings, each of which contains a body with a cylindrical recess in which the piston is placed, elastically deformable sealing rings, fittings and channels for supplying and draining the test fluid and air drainage, characterized in that the caps are made under one conditional passage of pipe fittings, while cylindrical grooves are made on the outside of the cylindrical part of the plug housings, and the pistons are fixed in the form of replaceable ring disks for various sizes of pipe fittings installed using radial elastically deformable sealing rings on the outer cylindrical grooves of the housings and fixed on them from axial displacement by threaded stops, and the outer cylindrical surface of the interchangeable annular disks is glad the grooves for elastically deformable sealing rings and made with the possibility of interfacing with the inner surfaces of the nozzles of the tested pipe fittings with an acceptable gap that ensures tightness of the radial seal by elastically deformable rings, while the channels for supplying and draining the test fluid and air drainage are made only in the cases and have upper and lower extension cords in the form of elbows and replaceable fittings located on the open ends of the replaceable ring disks and installed s with a gap relative to the inner surfaces of the nozzles of the tested pipe fittings. 2. The test bench according to claim 1, characterized in that at least three guide conical pins are installed on the open ends of the interchangeable annular disks, the largest outer diametrical surface of which is aligned with the outer diametrical surface of the interchangeable annular disks.

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