Section R. 324.1125 - Shut-in systemsRule 1125.
(1)A permittee of a well shall ensure that an H2S well which produces unattended and which has a stabilized producing tubing pressure of not less than 100 psig is equipped with a high-pressure and low-pressure shut-in system.(2) A permittee of a well shall ensure that a class I H2S well drilled after the effective date of these amendatory rules for which the 100 ppm radius of exposure includes an existing structure used for public or private occupancy, existing area maintained for public recreation, or the edge of the traveled portion of an existing interstate, united states, or state highway, shall be equipped with the following: (a) Hydrogen sulfide sensors located on four sides of the wellhead at a distance of not more than 20 feet. The sensors shall be set to activate safety shutdown equipment as specified in subdivisions (b) and (c) of this subrule when a hydrogen sulfide concentration of 30 ppm is detected. A permittee of a well shall calibrate the sensor system according to the manufacturer's instructions.(b) For flowing class I H2S wells: (i) Dual manual master valves.(ii) A fail-closed wing safety valve automatically actuated by a low pressure pilot sensor downstream of the valve and by the hydrogen sulfide sensors at the wellhead.(iii) Remote telemetry that alerts the well operator when the hydrogen sulfide sensors detect a hydrogen sulfide concentration of 30 ppm.(iv) An emergency access valve into the tubing spool.(c) For pumped class I H2S wells: (i) An emergency access valve into the tubing spool.(ii) A fail-closed blowout preventer automatically actuated in the event the polish rod breaks.(iii) A fail-closed polish rod ram blowout preventer automatically actuated by the hydrogen sulfide sensors at the wellhead.(iv) Equipment that automatically shuts off the pump drive unit in the event of a stuffing box failure.(v) A safety shut down of the pump drive unit, which cannot be isolated from the tubing pressure without unlocking a valve, automatically actuated by the high pressure low pressure sensor and the hydrogen sulfide sensors at the wellhead.Mich. Admin. Code R. 324.1125