RU1828985C - Method of application of wear-resistant coating on pipe inner surface - Google Patents

Abstract

SUMMARY OF THE INVENTION: a preform of a polymeric material is introduced into the pipe. Plugs are installed at the ends of the pipe. Through one plug equipped with a pipe, a working medium is supplied under excessive pressure to press the shell against the pipe wall and air is removed from the space between the pipe and the workpiece. Remove the plugs. A through hole is made in the pipe wall to allow air to escape from the space between the pipe and the workpiece. A flexible sleeve of wear-resistant material with a wall thickness of 2-4 mm, an outer diameter of 0.5-1.5 mm less than the "inner diameter of the pipe and a length exceeding the length of the pipe with flanges by the thickness of its flanges is used as a preform. After the sleeve is inserted into the pipe, its flanges are glued to the pipe flanges. As a working medium, liquid is used. The through holes in the wall of the pipe are plugged after air has ceased to escape from the space between the pipe and the sleeve. The second plug may be equipped with a nozzle and pressure gauge. 2 C.p. fs, 4 ill. (L C

Description

The invention relates to methods and devices aimed at ensuring the wear resistance of pipelines for non-aggressive fluids and can be used in various fields of technology.

In FIG. Figure 1 shows a flexible sleeve used as a workpiece, consisting of a housing 1 and flanges 2 with holes 3; Fig. 2 shows a rigid polymer pipe comprising a housing 4 provided with a through hole 5 and flanges 6 with openings 7; Fig. 3 is a diagram of a technology for applying a wear-resistant coating to a pipe showing a polymer pipe 4 in which a sleeve 1 is placed, the flanges 2 of which are glued with glue 8. for example, universal glue - Moment-1, Soyuzbytchim;

TU-6-15-1268-80; figure 4 shows a pipe 4 with a sleeve 1 mounted on it, while the hole 5 is sealed with a plug 13.

The ends of the pipe are closed with plugs 9, equipped with nozzles 1, with valves 11.

The pipe with one of the plugs is equipped with a pressure gauge 12.

The flexible sleeve 1 is made of wear-resistant material with a wall thickness of 2-4 mm, an outer diameter of 0.5-1.5 mm less than the inner diameter of the pipe 4 and a length exceeding the length of the pipe with flanges by the thickness of its flanges 2, the pipe wall is equipped with at least one through hole 5.

The sleeve 1 is inserted into the pipe 4 and flanges 2 are glued to the pipe flanges 6, closed

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the ends of the pipe with plugs 9 and through one of the plugs pump liquid into it, for example, a hearth used as a working medium.

After the cessation of air exit from the through holes 5, they are drowned, and the ends of the pipe are freed from the plugs 9.

When pumping liquid into a pipe, closed at both ends with plugs, the liquid presses the walls of the flexible sleeve to the inner walls of the pipe, while displacing air from the area between the sleeve and the pipe.

After the air has stopped flowing out of the through holes 5 and these holes have been sealed, the walls of the sleeve remain pressed against the walls of the pipe even after the pumping is stopped and the fluid is freed.

These features of the method make it possible to widely use polymer pipes in the derivations of hydroelectric power plants, land reclamation, and water supply, under conditions of high solids content in water.

Claims (3)

1. The method of applying a wear-resistant coating on the inner surface of the pipe, which consists in introducing into the pipe 5 0 5 would be workpieces from iolymernogo about ma i sriale. installation of plugs at the ends of the pipe, supplying, through one of them, equipped with a nozzle, of a working medium under excessive pressure to press the shell against the pipe wall and remove air from the space between the pipe and the workpiece and remove the plugs, characterized in that that at least one through hole is made in the pipe wall for air to escape from the space between the pipe and the workpiece, and a flexible sleeve of wear-resistant material with a wall thickness of 2-4 mm is used as the workpiece. with an outer diameter of 0.5-1.5 mm less than the inner diameter of the pipe and a length exceeding the length of the pipe with flanges by the thickness of its flanges, after introducing the sleeve into the pipe, its flanges are glued to the pipe flanges, while fluid is used as the working medium, and through holes in the wall of the pipe is drowned out after the cessation of the exit of air from the space between the pipe and the sleeve 2. Method of pop 1. characterized in that the second plug is also equipped with a nozzle 3. The method according to claims 1 and 2 is different. that the pipe of one of the plugs is equipped with a manometer Figure 1 X h   H H     N N L N FIG. 2. V Fig.Z eleven Figl