Existing Class I and III wells authorized by rule—maximum injection pressure.

The owner or operator shall limit injection pressure to the lesser of: (a) A value which will not exceed the operating requirements of § 144.28(f)(3)(i); or (b) A value for well head pressure calculated by using the following formula: Pm = (0.8 − 0.433 Sg) d where: Pm = injection pressure at the well head in pounds per square inch Sg = specific gravity of injected fluid (unitless) d = injection depth in feet. [49 FR 45308, Nov. 15, 1984]