RU1805504C - Process of manufacturing enclosure of biological protection of pipe-lines - Google Patents

Abstract

The invention relates to the processing of metals by pressure and can be used in the shipbuilding and nuclear industries. The purpose of the invention is to increase the reliability of protection by providing minimal clearances at the joints. An element of protective material in the form of pairs of half-cylinders, formed with the formation of profile grooves and mating protrusions on the annular and longitudinal ends, is joined in several layers on the pipeline surface with the longitudinal joints displaced relative to each other around the circumference of the pipeline section. The method provides accelerated installation of a bioconical protection fence pipelines. 1 s P. f-ly, 6 ill.

Description

The invention relates to the processing of metals by pressure and can be used in the shipbuilding and nuclear industries.

An object of the invention is to increase the reliability of protection by providing minimal clearances at the joints.

In FIG. 1 shows the original blank; in FIG. 2 - molding of a half cylinder with a longitudinal groove; in FIG. 3 - elements of a protective material before forming grooves and reciprocal protrusions on the annular ends; in FIG. 4 - tooling for forming grooves and mating protrusions at radial ends; in FIG. 5 - single-layer fencing of biological protection; in FIG. 6 - two-layer fencing biological protection with offset longitudinal joints.

The method includes the implementation of elements of protective material in the form of pairs of half cylinders with molding at one transition of longitudinal profiled grooves and reciprocal protrusions and with molding at the second transition of grooves and protrusions at the annular ends and pairwise installation along the pipeline. When carrying out a biological protection enclosure in several layers, pairs of half-cylinders are made with mating diameters and installed on the pipeline with a displacement of the longitudinal joints in the layers.

Example. Pipes to be protected were identified. From the total range of pipes with an outer diameter of 14 to 75 mm, it was considered advisable to isolate pipes with a diameter of 45 and 56 mm, since for the remaining pipes the length of the protected section was less than 5 m and the cost of manufacturing press fittings would exceed the cost of installing tape protection .

These pipes had sections with an estimated thickness of protection equal to 15 and 30 mm. Since lead sheets with a thickness of more than 15 mm are not rolled out by industry, the sizes of plates 1 for half cylinders 2 were calculated by calculation. Plates were cut from a lead sheet. On the bending stamp, 3 plates were bent and calved

WITH

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o ate o

formed in the blanks 2 longitudinal grooves 4. On the stamp 5 in the cavity b between the die 7 and the punches 8 were inserted two joined along the longitudinal joints of the blank 2.

The pressing force for each size of the guard 9 was determined experimentally and was fixed by a pressure gauge. For a pipe with a diameter of 45 mm, the pressing force for manufacturing the casing of the first layer was 294.0 kN, of the second layer 490.0 kN. For a pipe with a diameter of 56 mm, in the manufacture of the first layer, a pressing force of -392.0 kN and a second layer of -588.0 kN were recorded.

Molded guards do not have voids, dents, the density of the semicylinder joints along the longitudinal joints is so high that the joints are visually difficult to see.

Using the method allows to sharply increase the productivity of the installation of insulation. At the same time, it reaches 0

5

0

Reliability is comparable to a continuous multilayer coating.

FORMULA AND SECTION

Claims (2)

1. A method of manufacturing a biological protection fence, mainly pipelines, comprising making elements of a protective material with profiled grooves and reciprocal protrusions, as well as installing elements with a joint, characterized in that, in order to increase the reliability of protection by ensuring minimal gaps at the joints , elements of the protective material are made in the form of pairs of half-cylinders with the molding of first longitudinal profiled grooves and reciprocal protrusions, and then grooves and protrusions on the annular ends and set in pairs along the pipeline. 2. The method according to claim 1, characterized in that the pairs of half-cylinders are made with mating diameters and are installed in the form of layers on the pipeline with a displacement of the longitudinal joints in the layers. FIG. 1 Figure 2 Fig.Z figl