F - Mech Eng,Light,Heat,Weapons – 16 – L
Patent
F - Mech Eng,Light,Heat,Weapons
16
L
F16L 47/02 (2006.01) B29C 65/00 (2006.01) B29C 65/34 (2006.01) B29D 23/00 (2006.01) F16L 13/02 (2006.01)
Patent
CA 2167778
The invention provides a joint 80 for two steel pipes 50, 52 each containing a liner 54, 56 of polyethylene. The invention also provides an electrofusion fitting for joining the liners 54, 56; a method of making the fitting and a method of making the joint 80. The joint 80 consists of an electrofusion fitting having two frusto-conical outer end surfaces which match similar surfaces on the insides of the end portions of the liners 54, 56. Fusion welded joints are formed at the interfaces between the frusto-conical surfaces. A body of insulating material 66 is received in a central recess in the fitting and protects the fitting from the high temperature of the seam 70 between the steel pipes 50, 52. The frusto-conical surfaces make an angle of 10° or less with the longitudinal axis of the fitting. A metal support body 14 is shrunk and telescoped into the body of the electrofusion fitting and ensures that the fitting is adequately supported during electrofusion.
Linton Valerie Margaret
Maine Leslie
Bg Plc
Gowling Lafleur Henderson Llp
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