RU-2861572-C1 - DEVICE FOR SEALING INTERNAL CAVITY OF PIPELINE

RU2861572C1RU 2861572 C1RU2861572 C1RU 2861572C1RU-2861572-C1

Abstract

FIELD: construction; operation of pipeline transport. SUBSTANCE: invention relates to a device for sealing the internal cavity of gas pipelines during emergency work and repair of individual sections. The device includes an elastic inflatable chamber with sealing belts on the outer cylindrical surface, a nipple for supplying air into the internal cavity of the chamber and a channel-sleeve passing through the chamber. The device is equipped with an annular collar having a U-shaped or L-shaped cross-section, installed on the end of the pipeline. The pneumatic chamber with sealing belts, made of a cylindrical shape, is partially installed from 75 to 95 percent of its length in the pipeline cavity. Another part of the chamber, equal to 5 to 25 percent of its length, is located on the outside of the end of the pipeline. EFFECT: when sealing a pipeline using the proposed device, the reliability and quality of sealing the internal cavity and the end of the pipeline increases, including during long-term sealing. 2 cl, 3 dwg

Inventors

Reshke Leonid Petrovich
Shagapov Ilshat Radikovich
Ermakov Denis Aleksandrovich
OVCHINNIKOV BORIS SERGEEVICH

Dates

Publication Date: 20260506
Application Date: 20251030

Claims (2)

1. A device for sealing the internal cavity of a pipeline, including an elastic inflatable chamber with sealing belts on the outer cylindrical surface, a nipple for supplying air to the internal cavity of the chamber and a channel-sleeve passing through the chamber, characterized in that the device is equipped with an annular cuff, in a U-shaped or L-shaped cross-section, installed on the end of the pipeline, a pneumatic chamber with sealing belts, made of cylindrical shape, partially from 75 to 95 percent of its length is installed in the cavity of the pipeline, and the other part of the chamber, equal to from 5 to 25 percent of its length, is located on the outer side of the end of the pipeline.
2. The device according to paragraph 1, characterized in that the cuff is made of frost-resistant, oil- and petrol-resistant rubber or of a gas-containing material used in the temperature range from -60 to +60°C.

Description

The invention relates to the field of construction and operation of pipeline transport, namely to devices for sealing the internal cavity of natural gas pipelines during emergency or repair work in individual sections. There are areas where pipeline repairs are difficult, for example, due to waterlogging and, consequently, increased soil waterlogging. The presence of water obstacles on the ground surface complicates repairs. During preparatory work, specifically excavating the earthen embankment to the lower boundary of the pipeline when the pipeline is located underground, a trench is created on the linear portion of the section. This trench is filled with a water-soil mixture, a water-sand mixture, or water. This, in turn, leads to the formation of a flood zone at the work site and the filling of the pipeline interior with sand or water mixtures, making repairs impossible. If the mixture (water, sand, clay, etc.) passes the seals of the sealing devices where they adjoin the peripheral portion of the pipeline, it can enter the pipeline interior and vice versa, especially during lengthy repairs of the isolated section. At the same time, prolonged exposure of the said mixture to the material of sealing devices leads to a decrease in its physical and chemical properties, in particular, elasticity, over time. The process of using sealing devices for large-sized pipeline systems, for example, with an external pipeline diameter of 1420 mm and a wall thickness of 18.7 mm, is also complex. A plug for testing pipes for leaks is known in the art. It comprises a housing for inserting a pipe, a sealing element, a movable plunger, and a handle connected to a spindle (Utility Model Patent RU 217431, IPC G01M 3/00, G01M 3/08, G01M 3/12, published March 31, 2023). The housing is designed as a cup, with the sealing element and movable plunger located within the housing's interior. The housing consists of two parts connected by a screw. The movable plunger is secured to the screw by a pressure stop. The disadvantages of the known plug design include the complexity of its design and high labor intensity during use. A device is known for monitoring and regulating excess pressure during temporary shut-off of gas and oil pipelines (patent for invention RU 2228483, IPC F16L 55/12, published 10.05.2004). The pipeline shut-off device comprises an elastic sealed chamber, a supply flexible hose for feeding air into it under pressure for hermetically securing the device in the pipeline, and a flexible discharge sleeve communicating with the cavity of the pipeline in front of the device shutting it off and removing the working medium from it under excess pressure, wherein the elastic sealed chamber is made cylindrical, the flexible discharge sleeve passes through the entire cavity of the device, is hermetically secured in its front and rear end walls and is equipped with a three-way valve with a pressure gauge for monitoring and regulating the pressure of the working medium in the pipeline in front of the shut-off device secured therein, wherein the three-way valve and pressure gauge are located behind the shut-off device secured in the pipeline in the area where repair work is being carried out. The disadvantages of the known device include insufficient sealing of the pipeline and penetration of the working medium pumped through the pipeline, or the external medium into the pipeline, through loose contact of the shut-off device with the inner surface of the pipeline. The closest prototype to the claimed technical solution is an inflatable sealing plug (URL: https://srti.ru/katalog/rezinotkanevye-pnevmaticheskie-zaglushki/), which includes an inflatable cylindrical chamber-shell connected by a hose to an air supply source with sealing belts fixed to the outer cylindrical surface; the plug is equipped with a supply flexible hose-nipple for supplying air under pressure to it for hermetically sealing the device in the pipeline and a flexible outlet channel-sleeve communicating with the cavity of the pipeline. The disadvantages of the prototype include low reliability of pipeline sealing during repair or maintenance work and the possibility of passage (leakage) of the working medium between the sealing belts and the inner surface of the pipeline. The technical result of the proposed invention is to increase the reliability of pipeline sealing, ensuring long-term and high-quality sealing of the internal cavity and end of the pipeline. The technical result is achieved by using known features in the device, including an elastic inflatable chamber with sealing belts on the outer cylindrical surface, a nipple for supplying air into the internal cavity of the chamber and a channel-sleeve passing through the chamber, and new features, consisting in the fact that the device is equipped with an annular cuff, in the cross-section made in a U-shape or L-shape and installed on the end of the pipeline, one part of the chamber with sealing belts, equal