Patent ID: 9494271
Filing Date: 2016-11-15
CPC Classification: B29C,B29L,F16L

Claim Text:
1. A method of lining a length of pipe having varying diameters along the length of the pipe, the method comprising: inserting a pipe liner into the length of pipe, wherein the pipe liner has an inner surface and an outer diameter greater than an inner diameter of at least a portion of the length of pipe and wherein the pipe liner has been impregnated with a resinous material capable of curing and hardening; inserting a bladder capable of stretching circumferentially into the pipe liner, wherein the bladder has an unstretched outer diameter less than the inner diameter of at least a portion of the length of pipe; expanding the bladder under fluid pressure against the pipe liner, creating folds in the inner surface of the liner as it bunches upon itself at the portion of the length of pipe where the liner outer diameter is greater than the pipe inner diameter, allowing the resinous material to cure and harden to produce a substantially smooth finished surface along the portions of the length of pipe where the inner surface of the liner has folded and bunched upon itself; and removing the bladder from the length of the pipe.