SU1566165A1 - Method of applying heat-insulating coating on tube - Google Patents

Abstract

The invention relates to the application of insulating coatings on pipes, in particular to methods of applying polymer concrete insulation to pipes, and improves the quality of the heat insulating coating by providing additional mixing of the mixture in the mold during the casting process by smoothly rocking the mold about the horizontal axis depending on the diameter of the insulated pipe and is from 2 to 15 °. 1 hp f-ly, 2 ill.

Description

The invention relates to the construction of pipelines, namely the production of monolithic thermal insulation on pipes.

The purpose of the invention is to improve the quality of the thermal insulation coating. Due to the additional mixing of the reaction mixture, which eliminates heavy sedimentation with simultaneous intensive displacement of air at the time of pouring the mixture into the mold by smoothly swinging it about the horizontal axis at the same angle.

FIG. 1 shows the form during the pouring of the reaction mixture and its position in the swing, general view; in fig. 2 - the same, top view.

The method is carried out as follows.

A pipe 3 is installed in a mold made of the upper 1 and lower 2 flaps. The openings 4 are uniformly made on the upper flap 1 for air outlet and excess gases generated. The pipe 3 is installed in the mold using restrictive half-flanges (not

shown), ensuring the formation of a concentric annular gap for pouring a mixture into it.

Then, the upper flap 1 is closed and the flaps 1 and 2 are fixed with a locking mechanism (not shown). To the filling hole 5, made in the upper flap 1, in the center of the mold, pour the reaction mixture with a fixed distributor 6 of the mixer. The reaction mixture fills the annulus.

The mixture is poured with a smooth variable swing of the form into one and the other groups around the horizontal axis at an angle α ranging from 2 to 15 °. The termination of the swing and the stopping of the mold in a horizontal position are carried out simultaneously with the termination of the pouring of the mixture. After the process of pouring the mixture is completed, the filling hole 5 is closed with a shutter 7. The angle of swing of the mold relative to the horizontal axis is determined depending on the diameter of the pipe to which the thermal insulation coating is applied, while the level of the mixture to be filled in

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ate

about

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oh

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obtained by tilting the form at its ends, must be no higher than the extreme openings 4, made on the upper flap 1. The shape swing angle is determined from the condition

/ ga 2-Ј «-,

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U

where DM is the outer diameter LHI is the length of the insulation.

isolation;

The swinging of the mold is made during the period of pouring the mixture not exceeding 35 seconds, with a frequency equal to one swing cycle (starting from the lower inclined end of the mold up and down) in a time of 5-7 seconds, i.e. in this case, the maximum number of rocking cycles is 5 to 7 times.

Claims (2)

1. A method for applying a heat insulating coating to a pipe, which consists in uniformly pouring the reaction mixture into a mold with a tube, foaming and curing it, characterized in that, in order to improve the quality of the heat insulating coating, the mixture is filled in the center of the mold with simultaneous mixing the mixture smoothly rocking the form about the horizontal axis at an angle lying in the range of 2 - 15 °. 2. A method according to claim 1, characterized in that the swing angle of the mold is determined from 15 conditions 1L where is the outer diameter of the insulation; Lh. - insulation length.