147.503—Existing Class II (except enhanced recovery and hydrocarbon storage) wells authorized by rule.
Maximum injection pressure. To meet the operating requirements of § 144.28(f)(3)(i) of this chapter, the owner or operator shall use an injection pressure at the well head no greater than the pressure calculated using the following formula:
Pm=(0.733−0.433 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.