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Speed Control of Pig in Gas Pipeline

Jin Chaowen(Sichuan Oil Field Construction Co.,Chuandong Branch,Longchang,Sichuan,642150,China)  
The pig will be blocked or pig receiver will be damaged in case pig speed cannot be controlled properly when pig is pushed forward by compressed air.The pig speed shall be calculated and forecasted through effective measures to control the pigging speed within safe and reliable range.In South Trunk Line project of Sichuan,pigging speed calculation methods were applied appropriately,air compressors were reasonably shifted and operation duration of air compressors was reduced.The pig speed control principle described herein can be referred in gas pipeline pigging operation.
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