40 CFR § 147.753 - Existing Class I and III wells authorized by rule.

Maximum injection pressure. The owner or operator shall limit injection pressure to the lessor of:

(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 = (0.800–0.433 Sg)d

where:

Pm = injection pressure at the wellhead in pounds per square inch

Sg = specific gravity of injected fluid (unitless)

d = injection depth in feet.

[49 FR 20197, May 11, 1984, as amended at 56 FR 41072, Aug. 19, 1991]