Pipes and tubular conduits – Distinct layers – Bonded to each other
Patent
1995-11-02
1998-06-23
Brinson, Patrick F.
Pipes and tubular conduits
Distinct layers
Bonded to each other
138141, 138139, 138109, 285 12, F16L 914
Patent
active
057691282
ABSTRACT:
Multilayer fluid conduits are formed by adhering to a tubular outer surface of a metal pipe, a thermoplastic outer layer. The outer layer permits ends of the multilayer conduit to be joined together in leak-proof fluid conduit systems simply by adhering the conduit ends with compatible thermoplastic fittings. For fire protection systems, the preferred metal is steel, the preferred thermoplastic is CPVC and the preferred adhesive is heat activated. The adhesive coated metal pipe is preheated and the CPVC is extruded onto the outer surface of the heated metal pipe. Through the use of fire resistive CPVC, the multilayer conduit systems of the present invention can be installed in more severe fire threat areas than can existing, all plastic piping, including all CPVC piping systems. The conduit is assembled into systems on site simply by cutting and direct bonding with ordinary, all plastic fittings using appropriate bonding agents such as solvent based adhesives. CPVC fittings are preferred for fire protection systems.
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Communication dated Feb. 28, 1997 with Search Report of European Patent Application EP 96 11 7385 dated Jan. 27, 1997, and Abstract, 5 pp. total.
Auvil Andrew L.
Brannan Fred
Dalal Girish Trikamal
Evans Thomas L.
Meyer George G.
Brinson Patrick F.
Central Sprinkler Company
The B. F. Goodrich Company
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