A. Calorimeter or Chromatograph.
(1) The utility shall provide, or designate, a calorimeter, chromatograph, or other device of a type acceptable to the Commission for the regular determination of the heating value of the gas sold.
Installation. The equipment used to determine heating value shall be installed in a suitably located testing station acceptable to the Commission and subject to its inspection.
(3) Accuracy. The accuracy of all equipment used to determine heating value, as well as the method of making heating value tests, shall be acceptable to the Commission. Recording calorimeters or other equipment used to determine heating value shall be tested with a standard gas at least once each month.
(4) Records. Heating value test records shall be preserved for at least 3 years.
B. LP-Air. The utility shall determine the heating value of LP-Air once each hour when LP-Air is being injected into the distribution system.
C. Natural Gas and LPG. The utility shall determine the heating value of natural gas and undiluted LPG at least once each month, except that utilities selling gas subject to a thermal adjustment shall determine the heating value at least twice each day and shall make the tests during the period of the morning and afternoon peak demands.