43 CFR § 3175.119 - Components to analyze.
(a) The gas must be analyzed for the following components:
(4) Iso Butane;
(5) Normal Butane;
(7) Hexanes + (C6+);
(8) Carbon dioxide; and
(3) Octanes; and
(4) Nonanes +.
(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) For high-volume FMPs, once per year; and
(2) For very-high-volume FMPs, once every 6 months.