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:

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Pm = (0.733?0.433 Sg)dwhere:Pm = injection pressure at the well head in pounds per square inchSg = specific gravity of injected fluid (unitless)d = injection depth in feet.[49 FR 45306, Nov. 15, 1984]