Process and apparatus for embrittling and subsequently removing an outer protective coating of a pipe or pipeline
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United States of America Patent
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-
Sep 11, 1990
Grant Date -
N/A
app pub date -
Nov 1, 1988
filing date -
Nov 1, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The protective coating on a pipe is embrittled and removed by enclosing a portion of the pipe in a body defining an annular space around the protective coating. A pressurized liquid nitrogen cryogen is expanded within this annular space for a sufficient time to lower the temperature of both the protective coating and the underlying pipe to a temperature below the temperature of embrittlement of the coating.
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