Patent ID: 6231086
Filing Date: 2001-05-15
Classification: F16L,Y10S

Abstract:
An assembly for joining lengths of double-wall pipe each length having a metal outer casing with a first end and a second end, a metal inner carrier with a first end and a second end, and an annulus formed between said outer casing and said inner carrier, comprising:a first length of said pipe fabricated with closely-spaced exterior circumferential serrations on both ends of the inner carrier;a second length of said pipe fabricated with closely-spaced exterior circumferential serrations on both ends of the inner carrier;a metal ring-shaped member having a bore fabricated with closely-spaced serrations formed to be complementary to the serrations on both ends of the inner carrier when an end of the first length of pipe and an end of the second length of pipe are aligned adjacent to each other, said bore further having a first end tapered inwardly to the center of the ring-shaped member and a second end tapered inwardly to the center of the ring-shaped member;epoxy bonding material for application to all surfaces of the exterior circumferential serrations on both adjacent ends of the inner carrier and the bore;welding material for joining adjacent ends of said outer casing;said assembly being completed by the mechanical and bonding engagement of two adjacent ends of the inner carrier in the bore of the ring-shaped member and the welding of adjacent ends of said outer casing.