Pig trap development has occurred over many years and will continue as long as there remains the need to pig a pipeline. An understanding of the components, the function of each component and certain performance enhancing and safety features for a launcher and receiver helps one to grasp the function of the overall pigging system and procedures for launching and receiving a pig. Design considerations should extend beyond the limits of the pig trap to the boundaries of the pigging station. Trap assessments are extremely valuable to the responsible pipeline operator that is concerned with the condition of the pipeline equipment and the safety of the piegimg crews in the field.
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