Raychem Limited

Harry C Broyles

Peter L Brooks

Lawrence J White

Paul M Cook

Richard F Otte

James L Claypool

Laszlo Szalvay

The invention is a method and device for providing a protective coating for the inside of pipes, said method utilizing a device which is remotely actuated from outside said pipes. Specifically, the device comprises a memory metal delivery means, a corrosion resistant liner means, and a bonding means, said device expanding upon application of heat toward the inner wall of the pipe to cause the bonding means to flow progressively between the liner means and the inside of the pipe to thereby preclude air entrapment and to bond said liner means to the inside of the pipe.

Method for internal pipe protection

The invention is a device utilizing a sheet of memory metal being recoverable in substantially a single direction within the plane of said sheet of memory metal wherein said sheet has a plurality of perforations of a particular pattern and shape which enhance the recovery of said sheet in said direction beyond the inherent recovery of the memory metal comprising said sheet.

Enhanced recovery memory metal device

A device for providing a protective coating for the inside of pipes, said device being remotely actuated from outside said pipes. Specifically, the device comprises a high modulus engineering plastic delivery means, a corrosion resistant liner means, and a bonding means, said device expanding upon application of heat toward the inner wall of the pipe to cause the bonding means to flow progressively between the liner means and the inside of the pipe to thereby preclude air entrapment and to bond said liner means to the inside of the pipe.

Apparatus for internal pipe protection

A method and device for providing a protective coating for the inside of pipes, said method utilizing a device which is remotely actuated from outside said pipes. Specifically, the device comprises a memory metal delivery member, a corrosion resistant liner member, and a bonding member, said device expanding upon application of heat toward the inner wall of the pipe to cause the bonding member to flow progressively between the liner member and the inside of the pipe to thereby preclude air entrapment and to bond said liner member to the inside of the pipe.

The invention is a composite pipe coupling having a corrosion resistant liner which seals pipes to be coupled by utilization of a heat recoverable metallic material and having a pair of complementary heat recoverable metallic tensile rings and an external support structure which supplement the tensile strength of said liner, and of the overall coupling.

Tensile ring composite pipe coupling

A novel coupling member which comprises a hollow, generally tubular metal member which is heat-shrinkable or can be rendered heat-shrinkable in the radial direction and is provided on its inner surface with at least three teeth in the form of radially extending rings, the distance (t) between any pair of adjacent teeth being less than 0.95 d and less than 4 w, where d is the internal diameter of the tubular member, and w is the wall thickness of the tubular member, there being at least one tooth either side of the tooth nearest the center of the tubular member, the distance from the center of the member to the tooth nearest the center of the member being from 0 to 0.3 d and the distance between the two teeth adjacent the tooth nearest the center of the member being more than the smaller of 0.4 d and 3 w. Such a coupling member can be expanded by mandrel expansion methods without danger of damaging the teeth.

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Sunnyvale, CA, United States of America

Harry C Broyles