43 CFR §3175.119

1. (a)The gas must be analyzed for the following components:
   1. (1)Methane;
   2. (2)Ethane;
   3. (3)Propane;
   4. (4)Iso Butane;
   5. (5)Normal Butane;
   6. (6)Pentanes;
   7. (7)Hexanes + (C6+);
   8. (8)Carbon dioxide; and
   9. (9)Nitrogen.
2. (b)When the concentration of C6+ exceeds 0.5 mole percent, the following gas components must also be analyzed:
   1. (1)Hexanes;
   2. (2)Heptanes;
   3. (3)Octanes; and
   4. (4)Nonanes +.
3. (c)In lieu of testing each sample for the components required under paragraph (b) of this section, the operator may periodically test for these components and adjust the assumed C6+ composition to remove bias in the heating value (see § 3175.126(a)(3)). The C6+ composition must be applied to the mole percent of C6+ analyses until the next analysis is done under paragraph (b) of this section. The minimum analysis frequency for the components listed in paragraph (b) of this section is as follows:
   1. (1)For high-volume FMPs, once per year; and
   2. (2)For very-high-volume FMPs, once every 6 months.