Michigan Administrative Code
Department - Labor and Economic Opportunity
MIOSHA
General Industry and Construction Safety and Occupational Health Standards
General Industry Safety Standards
Part 57 - OIL AND GAS DRILLING AND SERVICING OPERATIONS
OTHER SPECIAL SERVICE OPERATIONS
Section R. 408.15771 - Freezing operations
Current through Vol. 24-16, September 15, 2024
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.
