Method of prestressing a tubular apparatus
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United States of America Patent
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-
Sep 3, 1985
Issued Date -
N/A
app pub date -
Jun 11, 1984
filing date -
Aug 31, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A tubular apparatus is assembled of inner and outer tubes which are connected at spaced locations along their length. After heat treatment and other processing steps, either the inner or outer tube is heated to reduce its yield strength and then stretched beyond its yield point but not beyond the yield point of the other tubular. The heat source is removed so that the stretched state is maintained. The tubular apparatus is thus prestressed with the inner tube under compressive prestressing when the inner tube has been heated and stretched, and the inner tube under tensile prestressing when the outer tube has been heated and stretched.
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