SU1199297A1 - Method of temporary protection of metal articles of cylindrical shape - Google Patents

Abstract

A METHOD OF TEMPORARY PROTECTION OF METAL PRODUCTS OF CYLINDRICAL FORM, which consists in applying a melt of a thermoplastic polymer on the outer surface of an article moving back and forth with simultaneous rotation, characterized in that, in order to facilitate the removal of the temporary coating, a plastic crepe will be used as a plastic crepe. form of dispersion c. air or inert gas at a temperature of 340-380 ° C and a pressure of 0.3-1.5 atm.

Description

;ABOUT

 YU

WITH

The invention relates to the protection of pipes or parts having a similar shape from mechanical damage, and is intended primarily to protect the outer surface of pipes made of corrosion-resistant steels from mechanical damage at all stages of the manufacture of pipelines, including the storage and interoperable transportation operations.

The purpose of the invention is to simplify the technology of removing the insulating coating from the pipe surface ..

The proposed method is explained by the following examples in the table.

Parameter Value | Characteristics of the protective technological I -coverage of the process |

I

one

-J

sprayed temperature Torch of polyethylene air fibers, ° С

320 heterogeneous, with a fiber diameter of more than 160 microns. Sheeting uneven, uneven with a density of 450 kg / m. Removing it from the outer surface of the pipe is difficult because of the parts. no adhesive coating. 340 Torch homogeneous, with a fiber diameter of 140 µm and a density of 300 kg / m 360 is easily removed. A uniform torch with a diameter of

fibers 75-160 µm. The protective coating has a density of 110-300 kg / and, it is easily squeezed without damage to the pipe 380. The torch is uniform in diameter

75 microns, density 120 kg / m

Table continuation

: g

390Polyethylene decomposition occurs, fiber diameter less than 75 microns

The coating is friable, vat-like: with a density of less than 100 kg / m

Air pressure spray, HTM

0.2

The melt does not disperse into the fibers.

Forms a seamless scratch 1.5 coating with the necessary characteristics, a fiber diameter of 75-160 µm, a protective coating density of 150 kg / m The torch does not form, a protective

i, r coating does not form on the pipe 1

Due to the fact that prior to spraying, the pre-molten polymer is dispersed by air or an inert gas heated to 340-380 ° C under a pressure of 0.3-1.5 atm on individual fibers, in the process of spraying, layering of the fibers on the surface of the pipe occurs. Sliping together with one another at intersections, the fibers form a porous coating which, on cooling, compresses and creates a free space between the surface of the pipe and the protective coating. Formed from chaotic thermoplastic fibers, a seamless protective coating after the final installation of the pipes is easily removed from the outer surface of the pipe with any cutting tool such as a knife.

Claims (1)

METHOD OF TEMPORARY PROTECTION OF METAL PRODUCTS OF CYLINDRICAL FORM, which consists in applying a melt of a thermoplastic polymer to the outer surface of a product moving back and forth with simultaneous rotation, characterized in that, in order to facilitate removal of the temporary coating, polyethylene is used as the polymer and applied from. air or inert gas at a temperature of 340-380 ° C and a pressure of 0.3-1.5 atm.