isolation device

Abstract

The invention discloses an isolation device, which belongs to the technical field of oil and gas pipeline maintenance. The device includes: a first cover body, a first seal, an isolation bag, a second seal and a second cover connected in sequence; the isolation device is detachably installed in a pipeline, and the pipeline is provided with The pigging port taken out of the isolation device. When the isolation device is placed in the pipeline, the edge of the first sealing member is close to the inner wall of the pipeline; when the isolation bag is filled with gas through the first air flow channel, the isolation bag expands and clings to the inner wall of the pipeline, thereby Double isolation is formed in the pipeline, and good isolation effect can be achieved without using a butter wall, so that the residual oil and gas in the pipeline will not leak into the hot area, avoiding the possible combustion or explosion danger of oil and gas in case of fire. After the hot construction is completed, the isolation device is taken out from the pigging port of the pipeline to avoid the formation of solid waste in the pipeline.

Description

technical field [0001] The invention relates to the technical field of oil and gas pipeline maintenance, in particular to an isolation device. Background technique [0002] In the field of oil and gas transportation technology, metal pipelines are usually used to transport oil and gas. During the long-term use of the pipeline, due to stress, corrosion and other reasons, some parts of the pipeline may be damaged or broken. In order to repair the pipeline, it is usually necessary to stop and vent the medium in the pipeline first, then cut off the damaged section of pipeline, replace a new section of pipeline to this position, and finally use hot construction (welding, etc.) Both ends of the new pipe are connected to the original pipe. In the process of pipeline maintenance, some combustible media, such as oil or combustible gas, may still remain in the pipeline, which will bring major safety hazards to hot construction. In order to ensure construction safety, an isolation de...

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention provides an isolation device, which can solve the need to use the poor stability and easy-to-collapse butter wall in the currently commonly used isolation devices, and after the hot-fire construction of the pipeline is completed, the isolation bag and the butter wall will form in the pipeline Solid waste that is difficult to discharge, affecting the quality of the medium and problems in the conveying process

Images