PIGGING
Pigging is the first activity to start the precommissioning works in the pipelines.It means to run a pig in the pipeline to remove the debris (such as welding rods,tools,etc..) . Simply we can say clean the pipeline .
Pigging can be carryout by the following methods .
Onshore Pigging
In onshore normally a pig is propelled by a compressed air and the no of pig run is depend on the quantity of debris ,Practically we run minimum 4 runs in the onshore pipelines.
Debris and other foreign materials mostly received in onshore pipelines only.
In offshore pig is propelled by water , A pig train(consist of three pigs) is normally run in the offshore pipelines.
I will explain offshore pigging methodology in next post ....
