F - Mech Eng,Light,Heat,Weapons – 16 – L
Patent
F - Mech Eng,Light,Heat,Weapons
16
L
189/24, 205/37
F16L 3/22 (2006.01) B21C 37/15 (2006.01) C21D 1/00 (2006.01) E21B 17/00 (2006.01) E21B 36/00 (2006.01) F16L 9/18 (2006.01)
Patent
CA 1202578
ABSTRACT OF THE DISCLOSURE A tubular apparatus is assembled of inner and outer tubes which are connected at spaced locations along their length. After heat treatment and other processing steps, either the inner or outer tube is heated to reduce its yield strength and then stretched beyond its yield point but not beyond the yield point of the other tubular. The heat source is removed so that the stretched state is maintained. The tubular apparatus is thus prestressed with the inner tube under compressive prestressing when the inner tube has been heated and stretched, and the inner tube under tensile prestressing when the outer tube hasbeen heated and stretched.
435504
Diamond Power International Inc.
Ridout & Maybee Llp
LandOfFree
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