What is ice plugging? 

1 Answer

Answer :

If there is a need to repair a valve of D20 PHT system, there are no other valves to shut of D20. So we use plastic bags on pipes and it has dry ice. Then liquid nitrogen is poured inside the bag. Due to the low temperature the D20 inside pipeline solidifies preventing any flow of D20 when valve is removed. This is called the ice plugging. 

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