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Dewatering
Dewatering
Pipeline Drying often follows pipeline dewatering.
On completion of a hydrostatic test the pipe is dewatered by a series of pigs propelled by compressed air. Often air bypasses the pig and sudden surges of compressed air/water exit the pipe and it is critical to secure and control this discharge. If the pipeline requires all residual water be removed, then after dewatering, the line must be dried to a set Dew Point. Eg Natural Gas pipelines.
Drying
Drying
Drying methods include:
Blowing dry air through the line, usually in conjunction with foam pigs,
Drying with nitrogen
Vacuum drying.
The dry air method is used mainly for onshore pipelines. A soft polyurethane foam pigs soak up the residual water while the dry air also absorbs water and carries it out of the pipeline. This process is continued until the pigs are received dry.
Rust and mill scale often remain on the internal surface of the pipe and is removed by running steel wire brush foam pigs. Once removed the foam pigs dry air can resume to remove any residual fine dust which may remain.
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