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In the pigging technology of long-distance natural gas steel pipelines, there are several types of p
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In the pigging technology of long-distance natural gas steel pipelines, there are several types of p

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In the pigging technology of long-distance natural gas steel pipelines, there are several types of p

Update:2022-06-16   View(s):268   Keywords :In the pigging technology of long-distance natural gas steel pipelines, there are several types of p
(1) Pigging ball
Usually, the pigging ball used in the gas steel pipeline is made of rubber material, the middle is empty, the thickness of the pipe wall is in the range of 3-5 cm, and there is a sealed water injection and exhaust hole on the top of the pigging ball. There is also a one-way valve for pressurization at the water injection port, which has the function of controlling the amount of water in the ball, which also controls the interference of the gas steel pipeline. The pigging ball has the function of removing the liquid and the separation medium in the gas steel pipeline, but the removal ability of the block is relatively poor.

(2) Straight plate pig
The main structure of the straight pipe pig is similar to the structure of the leather bowl pig. The straight pipe pig is divided into two types: the guide plate and the sealing plate. In the inner diameter of the steel pipeline; the sealing plate must have a certain degree of interference compared with the inner diameter of the gas steel pipeline. This pig can perform bidirectional movement, and it has a particularly strong ability to clean up debris in the steel pipeline. It is recommended to use it before the steel pipeline is put into production. Straight plate pig, because if there is a blockage of the steel pipeline, this pig can be used for backflushing to relieve the blockage of the steel pipeline.

(3) Leather bowl pig
This type of pig is simple in structure and flexible in installation. The commonly used leather cups are divided into cones, planes, and spheres according to their shapes; this pig is composed of a rigid frame and its front and rear sections. Or a knobby leather bowl. When it runs in a long-distance steel pipeline, it can run in a fixed direction, so the leather bowl pig can carry the instruments and equipment for detecting the steel pipeline; to ensure that the leather bowl pig can easily pass through the large-diameter branch pipe tee, the pig The leather cups of the front and rear sections must have the shortest interval limit. Through the results of experimental conclusions and theoretical calculations, it is determined that the distance between the front and rear leather cups of the pig should be greater than or equal to its pipe diameter D, and the total length of the pig can be determined according to the skin. The distance between the number of bowl sections and the diameter of the steel pipeline should be between 1D and 1.5D, and the interference between the lip of the leather cup of the pig and the inner diameter of the gas steel pipeline should be in the range of 2%-5%; this type of pig should There are many kinds of seals, and the sealing performance is also very good. Its cleaning tool is a steel brush.