40 CFR § 147.1153 - Existing Class II disposal wells authorized by rule in Indian country.
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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 (ii) of this chapter as applicable; or
(b) A value for well head pressure calculated by using the following formula:
Pm = (0.800−0.433 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.
[87 FR 45256, July 28, 2022]