Inflatable icepig and method of installing same

Details Inflatable icepig and method of installing same Inflatable icepig and method of installing same

F - Mech Eng,Light,Heat,Weapons

16

L

F16L 55/40 (2006.01) E03F 7/00 (2006.01) F16L 55/103 (2006.01) F16L 55/11 (2006.01) F16L 55/18 (2006.01)

Patent

CA 2231609

An ice plug of the type having an annular chamber for clean process water to be frozen to temporarily plug a section of a pipeline is described, in which the supply of clean process water is drawn from a bottom layer of water filling the inspected or repaired pipeline. Also disclosed and claimed is an improved ice plug which carries a reservoir of clean process water which is injected into the annular space limited by a flexible seal disposed between the process water in the annular interspace and the inner wall of the pipeline. An improved method of freezing an ice plug is also disclosed and claimed. It utilized a modified pneumatic excavation tool avoiding the need for the usual jacket around the pipe for liquid nitrogen or the like freezing substance.

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