Efficiency process and apparatus for embrittling an outer protective coating of a pipe or pipeline
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United States of America Patent
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Oct 16, 1990
Grant Date -
N/A
app pub date -
Nov 13, 1989
filing date -
Nov 13, 1989
priority date (Note) -
Expired
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Abstract
A protective coating on a pipe is embrittled by enclosing a portion of the pipe in a body defining an annular space around the protective coating. A pressurized LN2 cryogen is expanded within this annular space for 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. The LN2 is expanded so as to form elliptical patterns on the pipe surface.
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