September 2016, Vol. 243, No. 9

TechNotes

Trap Extensions Designed to Make Life Easier for Operators

There are two ways to design pig traps: the first is for cleaning or batching pigs, the second is for smart pigs. Cleaning pigs are short – about a diameter-and-a-half long, requiring a short pig trap barrel for easy loading and removal. Smart pigs are long, up to 10 diameters, requiring long pig trap barrels and specialized equipment for loading and removal. Smart pigs are run at five year intervals. Depending on pipeline operations, cleaning pigs or batching pigs can run daily. Running cleaning pigs in a pipeline equipped with smart pig traps becomes cumbersome because on a long launcher trap, the pig has to be pushed mechanically all the way to the reducer, and on large-diameter pipeline

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