RU2651122C2 - Method of hydrothermal insulation of pipes with foam polymeric mineral compositions - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: method of hydrothermal insulation of pipes is carried out in factory conditions by foamed polymeric materials with a mineral filler in a metal split mould. A pipe is installed in the split mould. The foam polymeric composition is poured on the top of the pipe so that the reaction mixture first covers the pipe surface and then flows down to the mould bottom and foams after closing the mould. The pipe in the mould is kept until the foam polymeric composition is fully cured, and unloaded from the mould.

EFFECT: improving the hydrothermal insulation quality occurs as a result of the porosity reduction and the density increase of the inner layer of the insulation.

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Description

Technical field

The invention relates to a method for thermo-waterproofing pipes in a factory with foamed polymeric materials with a mineral filler in a metal demountable form.

State of the art

A known method of applying a protective coating to a pipe by supplying a foaming composition in a detachable form and maintaining until the insulation solidifies [A.S. No. 1071864, IPC F16L 59/05. Method Yu.P. Konyukhov applying a protective cover to the pipe / Yu.P. Konyukhov and others; Orgtechstroy Trust Glavzapsibzhilstroy. - 3430925 / 29-08; declared 04/29/82, publ. 02/07/84] [1].

There is a method of applying heat-insulating coatings, for example polyurethane foams, on the outer surface of the pipes, in which the pipe is placed in a detachable metal form, a foaming composition is introduced into the gap between the pipe and the mold and maintained until it cures [Patent No. 2447353 of the Russian Federation, IPC F16L 59/05. The method of applying thermal insulation of pipelines / Muranova Maria Mikhailovna, Schelokov Anatoly Ivanovich; State educational institution of higher professional education Samara State Technical University. - 2010113443/06; declared 04/06/2010, publ. 04/10/12] [2].

Information is known when a pipe is placed in an open form on restrictive flanges and a reaction mixture is fed into a cavity formed between the pipe and the lower leaf of the mold [Patent No. 1566166 of the Russian Federation, IPC F16L 59/14. The form for applying thermal insulation to the pipe / Kotelenets V.N., Bulychev A.S., Krasovitsky A.S., Shokhirev A.A .; All-Union State Research and Design Institute "Vnipienergoprom". - 4,449,265; declared 05/24/1988; publ. 05/23/1990] [3].

A known method of thermal insulation of pipes based on foam-polymer compositions includes installing the pipe and pouring the reaction mixture into the lower part of the demountable mold, holding the product until the foam-polymer composition is completely cured and unloading the insulated pipe from the mold [RF Patent No. 21115059, IPC F16L 59/14. The method of thermal insulation of pipes based on foam-polymer compositions / Umerkin G.X., Bednyagin N.G., Tsibin Yu.I., Umerkin D.G. - 97119851/06; declared 12/03/1997; publ. 07/10/1998] [4].

Foam insulation is an integral material. Due to the temperature difference inside the insulating mass and in the surface layer, regions with different characteristics are formed. A thermo-waterproofing coating is formed with areas of different densities.

General disadvantages of the known methods of supplying the reaction mixture to the lower part of the mold are that the inner annular layer of insulation on the pipe surface is formed from a foaming composition rising from the lower part of the mold and, accordingly, having lower density, strength and higher porosity.

Disclosure of invention

The technical result of the invention is to improve the quality of thermal insulation by reducing porosity and increasing the density of the inner layer of insulation adjacent to the pipe.

A method of thermo-waterproofing pipes based on foam-polymer compositions includes installing the pipe in a detachable form, equipping it with longitudinal and transverse seals, and pouring the reaction mixture, holding the product until the foam-polymer composition is completely cured, and unloading the insulated pipe from the mold. The foam composition is poured onto the upper part of the pipe so that the reaction mixture, flowing into the lower part of the casting mold, first covers the surface of the pipe. The upper part of the form after filling is closed. Foaming of the reaction mixture occurs in closed form.

As a result, the formation of the inner layer comes from the composition of the highest density, having the lowest porosity.

Brief Description of the Drawing

For clarity and explanation of the description attached drawing.

In FIG. shows the structure of the thermal insulation of the pipe in cross section obtained by the method:

1 - thermally insulated pipe;

2 - inner layer of thermal insulation;

3 - the middle layer of thermal insulation;

4 - outer layer of thermal insulation.

The foam-mineral reaction mixture, poured onto the pipe 1 from above, covers it and flows into the lower part of the mold, where after a while it begins to foam. Foaming, it begins to rise from the bottom up, re-enveloping the pipe until the entire volume of the mold is filled. After filling, the lid is closed. The exit of the gas-air mixture occurs through the outlet openings. The product is kept in a closed form until the foam-polymer-mineral mass is completely cured.

As a result of the method, an insulation is obtained consisting of layers of different densities. The inner layer 2 has a high density and strength, low porosity, the middle layer 3 has the lowest density and heat transfer coefficient, and the outer layer 4 has an average density and strength.

The implementation of the claimed method of thermal insulation of pipes gives significant advantages to the resulting products:

- the inner layer of high density on the outer surface of the steel pipe performs the role of corrosion protection and improves adhesion of insulation to the pipe surface;

- the middle layer of low density, performs the function of thermal insulation and occupies the bulk of the foam insulation;

- The outer layer of high density provides additional mechanical and hydraulic protection for the pipeline.

All three layers are formed in one fill, and the difference in the characteristics of the layers is explained by different intensities of gas formation of the foaming agent, determined by the temperature difference in the thickness of the insulation and in the areas adjacent to the pipe and form (See. Fig.).

The application of the claimed method improves the quality and durability of thermal insulation of tubular products.

Information sources

1. A.S. No. 1071864, IPC F16L 59/05. Method Yu.P. Konyukhov applying a protective cover to the pipe / Yu.P. Konyukhov and others; Orgtechstroy Trust Glavzapsibzhilstroy. - 3430925 / 29-08; declared 04/29/82, publ. 02/07/84.

2. Patent No. 2447353 of the Russian Federation, IPC F16L 59/05. The method of applying thermal insulation of pipelines / Muranova Maria Mikhailovna, Schelokov Anatoly Ivanovich; State educational institution of higher professional education Samara State Technical University. - 2010113443/06; declared 04/06/2010, publ. 04/10/12.

3. Patent No. 1566166 of the Russian Federation, IPC F16L 59/14. The form for applying thermal insulation to the pipe / Kotelenets V.N., Bulychev A.S., Krasovitsky A.S., Shokhirev A.A .; All-Union State Research and Design Institute "Vnipienergoprom". - 4,449,265; declared 05/24/1988; publ. 05/23/1990.

4. Patent No. 2115059 of the Russian Federation, IPC F16L 59/14. The method of thermal insulation of pipes based on foam-polymer compositions / Umerkin G.X., Bednyagin N.G., Tsibin Yu.I., Umerkin D.G. - 97119851/06; declared 12/03/1997; publ. 07/10/1998.

Claims (1)

A method of thermo-waterproofing pipes based on foam-polymer-mineral compositions, including installing the pipe in a detachable form, equipping with longitudinal and transverse seals and pouring the reaction mixture, holding the product until the foam-polymer-mineral composition is completely cured and unloading the insulated pipe from the mold, characterized in that the foam-polymer composition is poured onto the upper part of the pipe so that the reaction mixture, flowing into the lower part of the casting mold, first covers the surface of the pipe, while foaming the reaction mixture occurs in closed form.

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