Pipe joints or couplings – Elbow
Patent
1979-06-14
1980-12-16
Callaghan, Thomas F.
Pipe joints or couplings
Elbow
138120, 138171, 138177, 285187, 285416, 285422, 285DIG6, 428616, F16L 5100
Patent
active
042392640
ABSTRACT:
The thermal expansion joint for relieving stresses in a pipe line due to thermal expansion consists of a pair of pipe sections wherein each section has one-half of its wall made of a metal having a higher thermal coefficient of expansion than the thermal coefficient of expansion of another metal forming the other half of the pipe section. The two metals are suitably welded along two axially aligned seams disposed on opposite sides of an axis. The section has suitably designed end flanges which can be coupled to each other and also to a flange on, for example, a standard pipe elbow. When the section is coupled to the standard elbow, the metal with the higher thermal coefficient of expansion is disposed on the opposite side from which the free end of the elbow points. Now, the free end of each elbow is coupled within the pipe line so that the fluid path is a modified "Z". To save space, the pair of sections can be formed into a helix.
REFERENCES:
patent: 700378 (1902-05-01), Schmidt
patent: 2739828 (1956-03-01), Schindler et al.
patent: 3210098 (1965-10-01), Watts
patent: 3529633 (1970-09-01), Vaillancourt
patent: 3632143 (1972-01-01), Lessmann
patent: 3743485 (1973-07-01), Gottlieb et al.
patent: 3746374 (1973-07-01), Sedgwick et al.
patent: 3970113 (1976-07-01), Guttinger et al.
Callaghan Thomas F.
Nardelli Dominick
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