Mich. Admin. Code R. 408.15771 - Freezing operations
Rule 5771.
(1)
A frozen plug shall be allowed to set a minimum of 1 hour per inch of pipe
diameter being frozen.
(2) When
possible, a frozen plug shall be pressure-tested from above for a minimum of 5
minutes to a pressure which is more than the known wellhead pressure.
(3) Following the pressure test, all pressure
shall be bled off the pipe above the frozen plug and observed for a minimum of
15 minutes before breaking out the pipe and installing a new valve.
(4) After installing the new valve, void
space between the frozen plug and valve shall be filled with fluid.
(5) A frozen plug shall be allowed to thaw at
a normal rate. Steam or hot water shall not be used to thaw a frozen
plug.
Notes
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