Freeze-thaw method for temporarily plugging process flowline

Details Freeze-thaw method for temporarily plugging process flowline Freeze-thaw method for temporarily plugging process flowline

1991-04-02

1992-06-30

Cohan, Alan

Fluid handling

Processes

Affecting flow by the addition of material or energy

137334, F17D 300

Patent

active

051254271

ABSTRACT:
Temporary plugs are formed in process flowlines by injecting into the flowlines a plugging material having a freezing point only slightly below the ambient temperature. The plugging material is frozen in place, and a servicing operation is conducted on the flowline. The plugging material is then allowed to thaw or is thawed by applied heat. Linear primary alcohols and normal paraffinic hydrocarbons are preferred plugging materials.

REFERENCES:
patent: 3631870 (1972-01-01), Livingston
patent: 4370862 (1983-02-01), Brister
patent: 4396031 (1983-08-01), Peterson
patent: 4416118 (1983-11-01), Brister
patent: 4492095 (1985-01-01), Brister

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