[Code of Federal Regulations]
[Title 40, Volume 30]
[Revised as of July 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR1065.215]

[Page 661]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 1065_TEST PROCEDURES AND EQUIPMENT--Table of Contents
 
                Subpart C_Test Fuels and Analytical Gases
 
Sec. 1065.215  Test fuel specifications for natural gas.

    (a) Natural gas used as a test fuel must meet the specifications in 
the following table:

                      Table 1 of Sec. 1065.215--Test-Fuel Specifications for Natural Gas
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                  Item                               Procedure\1\                   Value  (mole percent)
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1. Methane..............................  ASTM D 1945-96                     87.0 minimum.
2. Ethane...............................  ASTM D 1945-96                     5.5 maximum.
3. Propane..............................  ASTM D 1945-96                     1.2 maximum.
4. Butane...............................  ASTM D 1945-96                     0.35 maximum.
5. Pentane..............................  ASTM D 1945-96                     0.13 maximum.
6. C6 and higher........................  ASTM D 1945-96                     0.1 maximum.
7. Oxygen...............................  ASTM D 1945-96                     1.0 maximum.
8. Inert gases (sum of CO2 and N2)......  ASTM D 1945-96                     5.1 maximum.
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\1\All ASTM standards are incorporated by reference in Sec. 1065.1010.

    (b) At ambient conditions, the fuel must have a distinctive odor 
detectable down to a concentration in air of not more than one-fifth of 
the lower flammability limit.