New plant piping systems designed by piping
designers using experience and sophisticated analysis tools
rarely fail when operated within the design envelope.
Problems occur with "add on" systems that seem to grow over
the years. When there is a system upset, poorly restrained
piping can move and impact supports or other
piping.
This case examines a pipe that fell off an overhead
rack during such an upset. It broke the support and developed
a hydrocarbon leak. The failure investigation team wanted to
know what caused the pipe to move and the support to
fail.
Fig. 1 is a simplistic sketch that shows how the
pipe l
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