Pipe joints or couplings – With casing – lining or protector – Insulated
Patent
1990-12-28
1992-07-21
Nicholson, Eric K.
Pipe joints or couplings
With casing, lining or protector
Insulated
156 79, 264 465, 285292, 285293, F16L 5500
Patent
active
051316889
ABSTRACT:
An electrically insulated pipe coupling and method is disclosed in which a first sleeve member and a second sleeve member are positioned in axial alignment and include oppositely positioned end portions axially spaced from one another to create an axial space therebetween. A resilient annular seal portion is gradually formed in situ (preferably by applying liquid urethane onto a rotating mandrel) in the axial space. The seal portion is chemically bonding to the oppositely positioned end portions and creates a low pressure coupling seal between said first and second sleeve members. An outer protective layer made from continuous synthetic resin saturated fiberglass strand windings is encircled around at least a portion of the end portions of the first and second sleeve members to enclose the seal portion. Finally, a rigid reinforcing sleeve is embedded in and covered by the fiberglass windings of the outer protective layer.
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Coupling Systems, Inc.
Nicholson Eric K.
Shaffer Thomas R.
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