Components to analyze.

§ 3175.119 Components to analyze. (a) The gas must be analyzed for the following components: (1) Methane; (2) Ethane; (3) Propane; (4) Iso Butane; (5) Normal Butane; (6) Pentanes; (7) Hexanes + (C 6 +); (8) Carbon dioxide; and (9) Nitrogen. (b) When the concentration of C 6 + exceeds 0.5 mole percent, the following gas components must also be analyzed: (1) Hexanes; (2) Heptanes; (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 C 6 + composition to remove bias in the heating value (see § 3175.126(a)(3)). The C 6 + composition must be applied to the mole percent of C 6 + 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.