Abstract: An improved tubular lining hose for use in softlining pipe rehabilitation which includes the novel use of a layer of reinforcing fibers to reinforce the lining hose. In a preferred embodiment, a layer of reinforcing fibers, such as fiberglass, is encapsulated between layers of resin absorbing material saturated with resin. The saturated resin absorbing layers form a protective veil around the reinforcing fibers and protect the reinforcing fibers from water and other corrosive materials.

Abstract: An apparatus and method for removing air from a tube to improve the impregnation of the tube with a curable resin or other viscous fluid used in cured-in-place pipe rehabilitation. Also, a perforated needle for use in vacuum impregnation and a method of evacuating air from a flexible tube, particularly a lining tube used for rehabilitation of underground conduits.

Abstract: An improved method of rehabilitating a conduit which is in a damaged or deteriorated state. A lining hose, having a resin absorbing inner layer which is soaked with an excess volume of resin, is expanded and shaped to conformingly line a conduit by inverting a calibration hose under fluid pressure inside the lining hose. The calibration hose is comprised of a resin-absorbent layer and an impermeable layer that outwardly adjoins and surrounds the resin-absorbent layer. After inversion, the resin absorbent layer of the calibration hose contacts and adheres to the resin impregnated inner layer of the lining hose and is impregnated in situ with a portion of the excess volume of resin from the lining hose. Upon curing, the calibration hose becomes an integral part of the liner.

Abstract: A method of lining a pipe conduit to provide superior corrosion resistance. A flexible lining hose, having a resin absorbent layer which has been introduced with a volume of high strength resin, is first positioned inside of the conduit. The lining hose is then expanded into contact with the inner diameter of the conduit by inverting a calibration hose. The calibration hose has an impermeable membrane and a layer of resin absorbent material that has been introduced with a volume of corrosion resistant resin. The calibration hose is inverted by use of fluid pressure inside the lining hose, the fluid pressure being exerted against the impermeable membrane of the calibration hose. The resin layers are then cured by the application of a heated fluid until the lining hose and the calibration hose form a unitary rigid self supporting liner.