SU1381306A1 - Method of making protective coating of pipe against abrasive wear - Google Patents

Abstract

The invention relates to the field of hydromechanization, in particular, to pipeline repair from hydroabrasive wear, and makes it possible to simplify the work on applying a protective coating by using a sheath of flexible web material with a roughened surface that is worn on the inner tube formwork. The latter is placed in a protected pipe with an eccentricity relative to each other, provided by means of rigid ribs-cuffs, and the space between the pipes is poured with mortar (concrete). After the mortar has hardened, the formwork tube is removed and it can be reused. 2 Il.

Description

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15

This invention relates to hydro-mechanization, in particular to the protection of pipelines from hydro-abrasive wear. 2

The purpose of the invention is to simplify the work of applying a protective coating by using a sheath of flexible web material placed on the inner pipe 10b and allowing the latter to be removed after the solution has hardened.

Fig, 1 shows a pipe, a section; a fig 2 - section aa in figure 1;

The method is carried out as follows.

A formwork pipe 2 is placed into the internal cavity of a thin-walled metal tube, on which a covering 3 of flexible rolled material with a roughened surface and perforated stiffening ribs in the form of cuffs 4 attached to the covering 3 outside is put on. This provides good adhesion with a protective coating and makes it easy to extract the inner formwork pipe. The surface of the formwork pipe 2 can be lubricated with a non-cementing pipe interlayer and fixed to one another with an eccentricity providing a large protective coating in the working sector of the pipe (maximum wear sector). In the spaces 1E between the pipes, a mortar with enhanced abrasion resistance is injected. AT

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25

thirty

35

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As an abrasive-resistant solution, for example, a cement mortar with epoxy resin and silicon carbide additives is used, which has the following composition, wt%:

Portladcement 4.9-30.6 Construction

sand4,37-59,8

Epoxy

Dianova resin 1.2-1.8 Silicon carbide 8.7-14.9 SDB0.05-0.0.08

WaterEverything

After a set of initial strength with a mortar, the inner tube - the formwork is removed. It can be reused.

Claims (1)

20 claims Method C: building a protective coating of the pipe against abrasive wear, consisting in placing a pipe of smaller diameter in its internal cavity and pouring a hardening solution into the annular space, characterized in that, in order to simplify the work, on the internal pipe before placing it in the cavity protected the pipes put on a sheath of flexible rolled material with an increased roughness on the outside, fitted with perforated stiffening ribs in the form of cuffs, and after hardening of the filled solution, the inner pipe is extracted yut. J four .--and 9g 2