DEFORMATIONS AND MOTION PATTERNS OF CLEANING PIGS MADE OF HYPERELASTIC MATERIALS OF EQUAL PASSAGE TEES PIPES
DOI:
https://doi.org/10.31471/1993-9868-2024-2(42)-17-29Keywords:
silicone compound, polyurethane, pig pressure, geometric shape, pig stuck.Abstract
In order to increase the volume of gas production, increase the energy efficiency of pipelines and reduce losses of energy carriers due to breakdowns of the gas collection and transportation system of exhausted gas fields, gas, water and heat networks must be regularly cleaned of accumulated impurities in the internal cavity. High-quality cleaning of such pipeline systems without loss of the transported product is possible with one-piece cleaning pigs made of hyperelastic materials. Test samples of cleaning pigs were made from a silicone compound with a hardness of 30 units on the Shore A scale and polyurethane with a hardness of 80 units on the Shore A scale of different geometric shapes (cuff-cup, multi-disc, cylindrical-double-disc and dumbbell-disc). For experimental studies, installations made of glass and metal pipes, between which equal passage tees are placed, have been developed and assembled. The study was carried out for two flow patterns in the tee. According to the first scheme, the air stream entered the branch of the tee and into one of the sides of its trunk, and the pig entered the branch of the tee. According to the second scheme, the flow of air and the pig entered the branch of the tee and went out to one of the sides of the main line of the tee. It was experimentally established that the cuff-cup cleaning pig made of silicone compound needs the lowest pressure in the behind-pig space to pass the tees. This is facilitated by the slight bending of its core and the lack of significant resistance to it from the sealing elements of the pig (cuffs and cups). Instead, the cylindrical-double-disc pig made of silicone compound needs the highest pressure in the behind-pig space to pass the tees. Polyurethane pistons get stuck in the tees due to the minimal curvature of their middle part and the appearance of a gap between their rear part and the inner wall of the tee branch.
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