[Code of Federal Regulations]
[Title 40, Volume 21]
[Revised as of July 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR147.303]

[Page 742]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 147_STATE UNDERGROUND INJECTION CONTROL PROGRAMS--Table of Contents
 
                           Subpart G_Colorado
 
Sec. 147.303  Existing Class I, II (except enhanced recovery and 
hydrocarbon storage) and III wells authorized by rule.

    Maximum injection pressure. The owner or operator shall limit 
injection pressure to the lesser of:
    (a) A value which will not exceed the operating requirements of 
Sec. 144.28(f)(3) (i) or (ii) as applicable; or
    (b) A value for wellhead pressure calculated by using the following 
formula;

Pm=(0.733-0.433 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.