F - Mech Eng,Light,Heat,Weapons – 16 – L
Patent
F - Mech Eng,Light,Heat,Weapons
16
L
189/12
F16L 55/00 (2006.01)
Patent
CA 1163579
ABSTRACT OF THE DISCLOSURE An apparatus and method for working on a section of gas main while it is in service comprising a work chamber formable around a section of the gas main and having means for admitting a tool thereto in a manner that it can be manipulated from out- side the work chamber; means for removing the tool from the work chamber while maintaining the work chamber under gas pressure and means for safely evacuating the work chamber of gas.
393623
Mccoll Frederick A.
Petkoff Peter M.
Sewell John S.
Fetherstonhaugh & Co.
Union Gas Limited
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