What measures should be taken for long-term shutdown of liquefied gas pipelines?
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What measures should be taken for long-term shutdown of liquefied gas pipelines?
In the case of long-term parking, the liquefied gas is transferred to the oil storage area, nitrogen is used for purging until the conditions are satisfactory, and a slight positive pressure is maintained.
Drain the liquid level, then purge with water and steam
Since it’s for a long period of time, it’s best to fill it with nitrogen to maintain some pressure.
Nitrogen isolation is an important step, and attention must also be paid to dehydration in the lower areas!
Liquid and gas pipelines: material removal, purge to ensure compliance, isolation using blind flanges, labeling, dehydration at the lowest points, nitrogen filling to maintain a slight positive pressure; regular checks on pressure and condensate levels at the lowest points. The purpose is to prevent long-term corrosion.