Section PSC 134.30 - Periodic testing and maintenanceEach utility shall test its meters according to the following schedule except as provided in s. PSC 134.26(1). Where pressure regulators, volume corrective devices, or other measuring devices are used on the service or used in conjunction with the meters, they shall be tested on the same schedule as the meters.
(1) All diaphragm meters that are measuring dry gas and have non-absorptive type diaphragms or were rediaphragmed since the introduction of dry gas shall be due for removal from service, tested, adjusted, repaired if necessary, and retested if reused, every 180 months if the meter capacity is 2,400 cubic feet per hour or less at 1/2-inch water column and every 48 months if the capacity is greater than 2,400 cubic feet. Meters shall be tested during the calendar year in which said 180th or 48th month falls.(2) All diaphragm meters that are measuring dry gas that do not have non-absorptive-type diaphragms and have not been rediaphragmed since the introduction of dry gas shall be removed from service, tested, adjusted, re-diaphragmed and retested within 48 months of the introduction of dry gas if the meter capacity is 2,400 cubic feet per hour at 1/2-inch water column and within 24 months if the capacity is greater than 2,400 cubic feet.(3) All diaphragm meters that measure other than dry gas shall be removed from service, tested, adjusted, repaired, if necessary, and retested if reused every 96 months if the meter capacity is 2,400 cubic feet per hour or less at 1/2-inch water column and every 48 months if the capacity is greater than 2,400 cubic feet.(4) Rotary meters having a capacity of 15,000 cubic feet per hour or less at 4 oz. water column pressure shall be given a differential test at least once every 96 months and once every 48 months if the capacity is greater than 15,000 cubic feet. When the differential differs from the original test record by more than 50%, the meter shall be cleaned and/or repaired.(5) Orifice meters shall have their differential and static recording gauges tested at least once each month, the diameter and condition of the orifice checked at least once a year. The specific gravity of the gas shall be checked as required in s. PSC 134.21(4), and any temperature recording devices tested annually.(6) Turbine meters shall be given an inspection and spin test at least once every 12 months. When the coasting time is equal to or less than the specified minimum coasting time as on file with the commission, the meter shall be cleaned and/or repaired.(7) Turbine meters which are capable of automatically adjusting shall be inspected and tested at least once every 12 months. They shall be tested in accordance with s. PSC 134.28(6) or with the use of the meter manufacturer's electronic field prover.(8) Whenever an automatically adjusting turbine meter automatically adjusts the volume for plus or minus 5% or more while in operation at a steady flow rate of 10% or more of the meter's rated capacity, the meter shall be cleaned and/or repaired.(9) Whenever an automatically adjusting turbine meter is being tested at a steady flow rate of 10% or more of the meter's rated capacity and indicates an error of plus or minus 1% or more, the meter shall be cleaned and/or repaired.Wis. Admin. Code Public Service Commission PSC 134.30
CR Register, February, 1959, No. 38, eff. 3-1-59; am. (4), Register, November, 1962, No. 83, eff. 12-1-62; am. (1), Register, January, 1965, No. 109, eff. 2-1-65; am. (4) and CR (6), Register, April, 1969, No. 160, eff. 5-1-69; CR (7) to (9), Register, December, 1984, No. 348, eff. 1-1-85; am. (1) and (4), Register, November, 1989, No. 407, eff. 12-1-89.