LPG Lines
Unlike wax deposits in crude oil, black powder removed from the pipeline inner wall does not re-dissolve in the fluid (LPG) flow. This feature makes the evacuation of removed black powder out of the line extremely difficult. Especially if the pipeline is long and the amount of black powder significant, accumulation of deposit in front of a scraper pig can easily lead to pipeline blockage. This means that pipelines containing black powder should not be attempted to be cleaned in one pass unless progressive pigging, a by-pass pig, a jet pig, or gel pigs are used.
J. Smart adverts to a sufficient fluid velocity being extremely important for evacuation of removed black powder particles. Consequently, a technology applying enough cleaning force to (1) remove all black powder from the pipeline inner wall and (2) allowing for the required fluid velocity for evacuation is a good choice for cleaning.
Read more about this topic: Black Powder In Gas Pipelines, Methods For Removal
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