40 CFR 147.903 - Existing Class I and III wells authorized by rule.
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§ 147.903 Existing Class I and III wells authorized by rule.
(a) A value which will not exceed the operating requirements of § 144.28(f)(3) (i) or (ii) as applicable or;
(b) A value for well head pressure calculated by using the following formula:
Pm = (0.733-0.433 Sg)d
Pm = injection pressure at the well head in pounds per square inch
Sg = specific gravity of inject fluid (unitless)
d = injection depth in feet.