TAILIEUCHUNG - PIPELINE PIGGING TECHNOLOGY- P6

PIPELINE PIGGING TECHNOLOGY- P6: Why pig a pipeline? This paper introduces a number of reasons for doing so, together with a discussion of the advantages and alternatives. In general terms, however, pigging is not an operation to be undertaken lightly. There are often technical problems to be resolved and the operation requires careful control and co-ordination. | Pipeline Pigging Technology different contexts. The following definitions are included to avoid misunderstandings Intermediate testing Flooding precleaning gauging and hydrostatic pressure testing performed on separate pipeline sections after completion of the laying operation laying season. Precommissioning Consists of welding-sphere removal cleaning and system pressure testing. Commissioning Consists of dewatering drying and pressurization. Pigging operations The Zeepipe challenge - pigging of the world s longest subsea gas pipeline - will represent a further development within pigging technology it is almost twice as long as the present largest single-section offshore gas pipeline. The long-distance pigging concept was evaluated and decided upon during the conceptual phase. Several studies were performed and most of the relevant operators and pig manufacturers were consulted. Some of the manufacturers claimed that their present standard pigs would be capable of running this distance. Most of them however believed that some development or design work would be necessary. The main characteristic of the Zeepipe system is the pipeline length and consequently the large schedule impact from any requirement for repeated pigging operations. It is less effective and requires more resources to perform effective cleaning of longer pipelines. A precleaning operation is therefore included in the intermediate testing operation which is performed on shorter sections prior to tie-in. Furthermore cleanliness during laying operations is of paramount importance. Pigging during the project phase will consist of flooding gauging and precleaning during intermediate testing and welding-sphere removal cleaning and dewatering during precommissioning and commissioning. During normal operations only inspection pigging including necessary pre-pigging to prove the pipeline every fourth to sixth year is foreseen. Pigging conditions The main area of concern related to pigging length is wear .

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