Pipe joints or couplings – Elbow
Patent
1980-05-05
1982-06-08
Callaghan, Thomas F.
Pipe joints or couplings
Elbow
228112, 228175, 228263D, 285286, 285DIG6, F16L 1302
Patent
active
043336701
ABSTRACT:
A transition joint is disclosed for joining together tubular pieces formed respectively from a low alloy or carbon steel and a high temperature alloy composition including approximately 20% chromium, the transition joint including a plurality of tubular parts welded together and formed from standard code-approved materials of selected composition with a maximum variation in chromium content of approximately 2-5% between adjacent parts when the chromium content is below approximately 10% and a maximum chromium content variation of approximately 3-7% between adjacent transition parts when the chromium content of either part is above approximately 10% in either part, the transition parts being joined by friction welding and/or fusion welding and/or formed entirely by fusion welding deposition. The transition parts are also graded as to thermal expansion and strength characteristics, and the transition parts at opposite ends of the transition joint are preferably formed from low alloy or carbon steel and high temperature alloy composition respectively to facilitate in situ installation of the transition joint.
REFERENCES:
patent: 1613461 (1927-01-01), Johnson
patent: 2759249 (1956-08-01), Eberle
patent: 2763923 (1956-09-01), Webb
patent: 2770030 (1956-11-01), Carpenter
patent: 3052016 (1962-09-01), Zimmer
patent: 3123447 (1964-03-01), Zimmer
patent: 3175284 (1965-03-01), Cotovsky
patent: 3284174 (1966-11-01), Zimmer
patent: 3425718 (1969-02-01), Shaw, Jr.
patent: 4010965 (1977-03-01), Izuma et al.
patent: 4247036 (1981-01-01), Salesse et al.
Callaghan Thomas F.
General Atomic Company
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