RU50277U1 - PNEUMATIC SEALING CYLINDER FOR TEMPORARY OVERLAPPING OF PIPELINES - Google Patents

Abstract

The utility model relates to construction and is used during emergency recovery and repair work on gas pipelines and oil pipelines under excessive pressure. For temporary overlapping of gas and oil pipelines with a pneumatic sealing cylinder, it is fixed in the pipeline by feeding into an elastic cylindrical sealed chamber through a flexible supply air hose under pressure. An elastic cylindrical sealed chamber through a flexible outlet tube is connected to a pressure gauge located next to the shut-off valve located on the inlet hose. The air pressure in the cylindrical sealed chamber is constantly monitored by means of a manometer mounted on the discharge tube. A flexible outlet pipe is located in the cavity of the inlet hose, exits through the shut-off valve, or is located outside the inlet hose, hermetically fixed to the front end of the cylindrical sealed chamber, equipped with a pressure gauge for constant pressure control inside the cylindrical sealed chamber and is attached to the inlet hose, and the shut-off valve and the pressure gauge is located near the cylindrical sealed chamber fixed in the pipeline and behind it in a non-hazardous area of repair work. The utility model expands the arsenal of technical means, increases the safety of fire and gas hazardous work in the repair of pipelines for various purposes.

Description

The utility model relates to construction and is used during emergency recovery and repair work on gas pipelines and oil pipelines under excessive pressure.

From the prior art it is known that when carrying out repairs on the pipeline associated with the use of welding, there is a danger of fire or explosion of the gas mixture. To prevent this, the repair zone is isolated by the installation from two sides along its borders in the pipeline of sealing devices. When conducting emergency recovery and repair work on pipelines, various designs of rubber and rubber-tissue sealing pneumatic devices are used. Moreover, in the process of fire and gas hazardous work, pressure control in the sealing device can only be carried out discretely during periods when the compressor is disconnected from the tube for filling and pumping air out of the device. In this case, the used rubber-fabric sealing cylinders, in contrast to the previously used rubber spherical devices, are more durable, but also more sensitive to deviation from the set pressure inside the cylinder. In case of under pumping, the product may shift under the influence of backpressure behind the cylinder and its destruction due to friction against the pipe wall. When pumping, the cylinder may burst. Under these conditions, constant monitoring and the ability to automate maintaining the set pressure inside the sealing device is important for the safety of fire and gas hazardous work.

The prior art device is known as a “pneumatic sealing cylinder” (SU 39377, 04/06/2004), containing an inflatable shell with external end surfaces in the form of a cone. Circumference

at least three sealing elements are installed in the meridional direction in the places of the smallest radius of curvature of the shell, and at least one of them has a rectangle, or square, or trapezoid, or triangle in cross section, and the others have a figured profile containing closed cavities and sealing transverse ribs facing the inner surface of the pipeline. On one end surface of the inflatable shell for filling and pumping air there is a tube and a loop with a halyard for the convenience of removing the device from the pipeline. The sealing elements are made of resiliently elastic material, the outer side surface of the sealing elements having a figured profile in the cross section is curved, for example, zigzag. The sealing transverse ribs are located obliquely to the rectilinear base of the curved profile at a different angle, lying in the range of 30-90 degrees.

The known device does not provide a full fit to the inner surface of the pipeline and the necessary sealing when the standard pressure inside the device is not achieved due to under-pumping when installing it or lowering the pressure below normal during its operation, for example, due to the difference in external temperature and the lack of control of the gas pressure in front of the device .

Closest to the technical nature of the claimed utility model is a sealing pneumatic device for tight shutoff of a pipeline (RU 2228483, 05/10/2004), containing a tight chamber, a flexible hose for supplying it under air pressure to tightly fix the device in the pipeline and a flexible outlet sleeve communicating with the cavity of the pipeline in front of the device and diverting the working medium from the specified volume of the pipeline. A flexible outlet sleeve passes through the entire cavity of the locking device, made in the form of inflated

a cylindrical shell, is hermetically fixed in its front and rear end walls and is equipped with a three-way valve with pressure gauge for monitoring and regulating the working medium in the pipeline cavity before the sealing pneumatic device fixed in it, while the three-way valve and pressure gauge are located behind the device fixed in the pipeline, i.e. in a non-hazardous area of repair work.

A disadvantage of the known device is the unreliable overlap of the pipeline, due to the lack of constant monitoring of the pressure inside the device and the ability to automatically maintain internal pressure at a given level.

The claimed utility model solves the problem of constant pressure control inside the device, the ability to automate the maintenance of a given pressure and increase the reliability of the pipeline sealing during basic and gas hazardous work on gas and oil pipelines.

The solution to this problem is achieved by the fact that the pneumatic sealing cylinder fixed in the pipe by supplying pressurized air to the elastic cylindrical sealed chamber through a flexible inlet hose connected to the compressor is equipped with an additional flexible outlet pipe. The pressure inside the elastic cylindrical sealed chamber is constantly monitored by means of a pressure gauge installed on the discharge tube, which is located next to the shut-off valve of the inlet hose. The outlet tube (gauge) passes inside the inlet hose and is attached to its wall with an outlet outside in front of the stopcock, or is located next to the inlet hose parallel to it and is attached to it with strong ribbons.

The locking pipeline of the pneumatic sealing cylinder contains an elastic cylindrical hermetic chamber supplying a flexible hose for supplying pressurized air to it

fixing the device in the pipeline and a flexible outlet pipe in communication with the elastic cylindrical sealed chamber and constantly transmitting pressure to the pressure gauge. A smaller smaller flexible outlet pipe passes through the entire cavity of the inlet hose, made in the form of a cylindrical pipe, hermetically fixed to the front end wall of an elastic cylindrical hermetic chamber and equipped with a shut-off valve, attached to the inner wall of the inlet hose and goes out in front of the shut-off valve, or a flexible outlet pipe fixed in the front end of the elastic cylindrical sealed chamber, passes outside and parallel to the inlet hose, attached to it with ribbons and connects I with pressure gauge for continuous monitoring of pressure in the elastic cylindrical sealed chamber, the shut-off valve and a pressure gauge are located behind the device fixed in the pipe, i.e. in the non-hazardous area conducting repairs.

The utility model is illustrated by graphic material, where figure 1 schematically shows the proposed device for temporary tight shutoff of a section of the pipeline in the working position, a longitudinal section, with a discharge pipe installed inside the inlet hose;

figure 2 - also with a discharge tube outside and along the inlet hose.

The device operates as follows.

A pneumatic sealing cylinder 2 is placed in the cavity of the pipeline 1. Through a flexible supply hose 3, air is supplied under pressure into an elastic cylindrical hermetic chamber 4, which increases in volume, its external surface interacts with the internal surface of the pipeline 1 using sealing sealing elements 5, fixes and fixes device 2 in the pipeline 1. The device contains a flexible outlet pipe 6, which passes either through the internal cavity of the inlet

of the hose 3 and is hermetically fixed in the front end wall 7 of the elastic cylindrical sealed chamber 4, and is also attached to the inner wall of the inlet hose 3, the other end of the gauge tube 6 is brought out in front of the shut-off valve 8, which is installed on the inlet hose 3 (figure 1), or a flexible outlet pipe 6 extends outside the inlet hose 3, hermetically fastens in the end wall 7 of the elastic cylindrical sealed chamber 4, extends along the inlet hose 3 and is attached to it with a braid 10 (FIG. 2). The pressure in the elastic cylindrical sealed chamber through the discharge pipe 6 is constantly transmitted to the pressure gauge 9, which is installed next to the shut-off valve 8, the manometer and shut-off valve are located in a non-hazardous area of repair work.

The claimed utility model expands the arsenal of technical means, increases the safety of fire and gas hazardous work in the repair of pipelines for various purposes. In addition, constant monitoring of the pressure in the device eliminates structural solutions that ensure reliable fastening of known devices, for example, by increasing the mass of the device, its length, which leads to an increase in the technological holes cut out in the pipeline for introducing sealing devices into the pipeline.

Claims (1)

A pneumatic sealing cylinder for temporarily shutting off gas and oil pipelines, comprising an elastic cylindrical hermetic chamber, hermetically connected to it and equipped with a shut-off valve supplying an air supply hose to said chamber under pressure and a flexible outlet (gauge) tube communicating with the cylindrical hermetic chamber, characterized in that the latter is located in the cavity of the inlet hose, exits out of it in front of the stopcock or is located outside the inlet hose, hermetically akreplena in the front end of the cylindrical hermetic chamber is provided with a pressure gauge for continuous monitoring of pressure within a sealed cylindrical chamber and is attached to a supply hose, with a pressure gauge and stopcock located near the cylindrical conduit fixed in a sealed chamber and behind it in the non-hazardous area conducting repairs.