Section R. 460.2331 - Sale of gasRule 31.
(1) All gas that is sold by a utility must be on the basis of meter measurement, unless otherwise approved by the commission.(2) The utility shall provide the terms and conditions of service available to prospective customers upon request.(3) If gas is supplied and metered to a customer at a nominal delivery pressure of 0.25 pounds per square inch gauge, then, for billing purposes, both of the following provisions apply: (a) The gas volume that is registered by the meter is assumed to be measured at standard billing conditions as defined in R 460.2301(d)(i), regardless of the actual temperature of the gas or actual atmospheric pressure. All meters that are to operate at ambient outdoor conditions must be equipped with a temperature-compensating device.(b) If the billing pressure base is 14.65 pounds per square inch absolute, then the atmospheric pressure is assumed to be 14.4 pounds per square inch absolute. If the commission has approved a different billing pressure base, then the assumed atmospheric pressure is equal to the difference between such absolute billing pressure base and 0.25 pounds per square inch.(4) If gas is supplied to a customer through a low-pressure distribution system such that a service regulator is not used before metering, then, for billing purposes, the gas must be assumed to be supplied and metered at 0.25 pounds per square inch gauge. The low-pressure system must be operated so that the gauge pressure at the outlet of the meter must be maintained within a range of 3 inches water column minimum to a maximum of 14 inches water column. However, delivery to the customer may be as high as 18 inches water column if the pressure to the gas utilization equipment is regulated to not more than 14 inches water column. A utility may implement different standards for operating its low-pressure system if those standards are approved by the commission.(5) If gas is supplied and metered to a customer at a nominal delivery pressure of more than 0.25 pounds per square inch gauge, then, for billing purposes, all of the following provisions apply: (a) The gas volume that is measured by the meter must be corrected to standard billing conditions as defined in R 460.2301(d)(i).(b) Gas volume corrections for temperature must be made pursuant to Charles law. Gas volume corrections for pressure must be made pursuant to Boyles law. Gas volume corrections for supercompressibility must be made pursuant to either of the following publications, both of which are adopted by reference in R 460.2344:(i) "Manual for the Determination of Supercompressibility Factors, PRCI Project NX-19" as adopted by reference in R 460.2344.(ii) "American Gas Association (AGA) Report No. 8, Part 1, "Thermodynamic Properties of Natural Gas and Related Gases, DETAIL and GROSS Equations of State." (2017) AGA Catalog No. XQ1704-1 as adopted by reference in R 460.2344.(c) If the pressure at which the gas is metered is established on a gauge basis rather than an absolute basis, then the absolute pressure at which the gas is metered must be inferred by summing the gauge pressure and either the actual atmospheric pressure or a reasonable estimate thereof or an atmospheric pressure that is filed with, and approved by, the commission.(d) If a pressure-compensating device is used with the meter, the device must be calibrated using the actual atmospheric pressure or a reasonable estimate thereof.Mich. Admin. Code R. 460.2331
1979 AC; 1993 AACS; 2020 MR 17, Eff. 9/3/2020