RU2831951C1 - Method for tight connection of pipes with diameter ratio from 1:4 to 4:10 using heat-shrinkable tubes - Google Patents

Abstract

FIELD: pipelines.

SUBSTANCE: invention relates to a method for tight connection of pipes with diameter ratio from 1:4 to 1:10. Additional heat-shrinkable tubes are sequentially installed on the pipe of smaller diameter. Number of tubes for installation is calculated based on fulfillment of inequality (d₂ + 2S) > 1,2D₂, where d₂ is the diameter of the smaller diameter pipe, D₂ is the inner diameter of the covering heat-shrinkable tube after free shrinkage, S is the total thickness of all additional heat-shrinkable tubes preliminarily tightly fitted on the smaller diameter tube. Between the heat-shrinkable tubes, as well as between the tubes and the heat-shrinkable tubes, there is an adhesive layer of ethylene vinyl acetate. Clamp is installed at the ends of the last installed heat-shrinkable tube at a distance of not less than one diameter from the edge of the connected pipe. Length of each of the additional heat-shrinkable tubes is set at least (h+3d₂), where h is the clamp width, and the length of the heat-shrinkable tube, which connects both pipes, is set not less than: (h+3d₁) + Z+(h+3d₂), where d₁ is the diameter of the larger diameter pipe, Z is the gap between the pipes being connected.

EFFECT: simplified method, expansion of the possibility of using heat-shrinkable tubes for hermetically sealed connection of pipes and expansion of the arsenal of technical means.

1 cl, 1 dwg

Description

The invention relates to a method for hermetically sealing pipes with a diameter ratio of 1:4 to 1:10 and can be used in mechanical engineering.

The closest to the proposed method is the connection of two objects using a heat-shrinkable sleeve (see patent RU No. 2783345 published 11.11.2022).

Its disadvantage is a narrow range of application, the lack of a simple way to hermetically connect pipes with a diameter ratio from 1:4 to 1:10.

The technical objective of the proposed solution is to simplify the method, expand the possibility of using heat-shrinkable tubes for hermetically sealed connections of pipes with diameter ratios from 1:4 to 1:10, and expand the arsenal of technical means.

To solve the problem, a method is proposed for hermetically sealed connection of pipes with diameter ratios from 1:4 to 1:10 using heat-shrinkable tubes, whereby additional heat-shrinkable tubes are successively installed on a pipe of a smaller diameter, and the number of tubes for installation is calculated based on the fulfillment of the inequality

Where:

d ₂ - diameter of the smaller diameter pipe;

D ₂ - the inner diameter of the covering heat shrinkable tube after free shrinkage,

S is the total thickness of all additional heat-shrinkable tubes pre-fitted tightly onto a pipe of a smaller diameter, with an adhesive layer of ethylene vinyl acetate placed between the heat-shrinkable tubes, as well as between the pipes and the heat-shrinkable tubes, and a clamp installed at the ends of the last installed heat-shrinkable tube at a distance of at least one diameter from the edge of the pipe being connected, the length of each of the additional heat-shrinkable tubes is set to be at least (h+ _3d2 )

Where:

h - clamp width,

and the length of the heat shrink tube that connects both pipes is set to no less than:

Where:

d ₁ - diameter of the pipe of larger diameter;

Z - the gap between the pipes being connected.

A distinctive feature of the proposed method is that additional heat-shrinkable tubes are successively installed on a pipe of a smaller diameter, and the number of tubes for installation is calculated based on the fulfillment of the inequality

Where:

d ₂ - diameter of the smaller diameter pipe;

D ₂ - the inner diameter of the covering heat shrinkable tube after free shrinkage,

S is the total thickness of all additional heat-shrinkable tubes pre-fitted tightly onto a pipe of a smaller diameter, with an adhesive layer of ethylene vinyl acetate placed between the heat-shrinkable tubes, as well as between the pipes and the heat-shrinkable tubes, and a clamp installed at the ends of the last installed heat-shrinkable tube at a distance of at least one diameter from the edge of the pipe being connected, the length of each of the additional heat-shrinkable tubes is set to be at least (h+ _3d2 )

Where:

h - clamp width,

and the length of the heat shrink tube that connects both pipes is set to no less than:

Where:

d ₁ - diameter of the pipe of larger diameter;

Z - the gap between the pipes being connected.

The technical solution is illustrated by a drawing showing the connection of pipes using heat shrinkable tubes (HST).

The essence of the proposed method is as follows. Additional heat-shrinkable tubes 2, 3 are successively installed on a pipe 1 of a smaller diameter. The number of tubes for installation is calculated based on the fulfillment of the inequality

Where:

d ₁ - diameter of pipe 1 of smaller diameter;

D ₂ - the inner diameter of the outer, covering heat-shrinkable tube 4 after free shrinkage,

S is the total thickness of all additional heat-shrinkable tubes 2,3, pre-tightly seated on a smaller diameter tube 1. High-quality, tight shrinkage of heat-shrinkable tube (HST) on a tube is achieved when the following inequality is satisfied:

where: D ₁ - diameter of the TUT before shrinkage,

D ₂ - diameter of the TUT after free shrinkage.

If the smaller diameter of the pipes being connected is so small that it is less than (1.2D ₂ ), then it is not possible to ensure high-quality shrinkage within the framework of existing technologies, since the “resource” of heat shrinkage is not sufficient (see “Instructions for use HERE for installation and repair of communication cables”. I-13015, Moscow 2005, SvyazStroyDetal).

The essence of the proposal is to increase the dimensions of the smaller diameter d ₂ by shrinking several additional heat-shrinkable tubes so as to achieve the value: (d ₂ + 2S), where S is the total thickness of all auxiliary heat-shrinkable tubes pre-tightly shrunk onto the smaller diameter. Between the heat-shrinkable tubes 2,3,4, as well as between the tubes 1,5 and the heat-shrinkable tubes 4,2, an adhesive layer 6,7,8,9 made of ethylene vinyl acetate is placed. At the ends of the last covering installed heat-shrinkable tube 4, at a distance L ₁ L ₂ of at least one diameter from the edge of the connected tube 5 and 1, respectively, a clamp 10, 11 is installed. The clamp is a structure made of a metal tape with a bolted connection, made of stainless steel.

The length of each additional heat shrink tube is set to be no less than (h+3d ₂ )

Where:

h - clamp width,

and the length of the heat shrink tube that connects both pipes is set to no less than:

Where:

d ₁ - diameter of the pipe of larger diameter;

Z - the gap between the pipes being connected.

Example 1

It is necessary to connect pipes with diameters of 8 mm and 2 mm.

Let there be no heat shrinkable tube (HST) with the corresponding shrinkage ratio (4/1). The sequence of heat shrinkage operations is as follows:

- we fit TUT 3/1.5 with a thickness of 0.5 mm onto the smaller pipe. We get an external diameter of 3 mm;

- we put HERE 4/2 with a thickness of 0.5 mm in the same place. We get an external diameter of 4 mm.

- we shrink HERE 6/3 with a thickness of 0.5 mm. We get an external diameter of 5 mm.

- finishing operation - covering TUT 9/4.5 - hermetically closes the connection, after which the entire structure is fixed with clamps.

Example 2

It is necessary to connect pipes with diameters of 10 cm and 1 cm (extreme difference in diameters).

Here the sequence of shrinkages is as follows:

HERE 16/8 with a thickness of 1 mm increases the diameter of the small pipe by 2 mm. We get a diameter of 12 mm.

HERE 16/8 with a thickness of 1 mm increases the pipe diameter by 2 mm. We get a new diameter of 14 mm.

HERE 20/10 with a thickness of 1.5 mm increases the diameter of the pipe by 3 mm. We have a new size - 17 mm.

HERE 30/15 with a thickness of 2.0 mm is used twice and increases the diameter to 25 mm.

HERE 60/30 with a thickness of 2.0 mm increases the diameter size to the required 50 mm.

Covering TUT with parameters 120/40 hermetically connects pipes with diameters of 100 mm and 10 mm

After which the clamps are installed.

Claims (14)

A method for hermetically connecting pipes with a diameter ratio of 1:4 to 4:10 using heat-shrinkable tubes, characterized in that additional heat-shrinkable tubes are successively installed on a pipe of a smaller diameter, and the number of tubes for installation is calculated based on the fulfillment of the inequality Where: d ₂ - diameter of the smaller diameter pipe, D ₂ - the inner diameter of the covering heat shrinkable tube after free shrinkage, S is the total thickness of all additional heat-shrinkable tubes pre-fitted tightly onto a pipe of a smaller diameter, with an adhesive layer of ethylene vinyl acetate placed between the heat-shrinkable tubes, as well as between the pipes and the heat-shrinkable tubes, and a clamp installed at the ends of the last installed heat-shrinkable tube at a distance of at least one diameter from the edge of the pipe being connected, the length of each additional heat shrink tube is set to be no less than (h+3d ₂ ) Where: h - clamp width, and the length of the heat shrink tube that connects both pipes is set to no less than: (h+3d ₁ ) + Z+(h+3d ₂ ) Where: d ₁ - diameter of the pipe of larger diameter, Z - the gap between the pipes being connected.

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