Wisconsin Administrative Code › Public Service Commission › Chapter PSC 134 - Standards For Gas Service › Section PSC 134.30 - Periodic testing and maintenance

Current through June 24, 2024
Each 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 ½-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
			 ½-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 ½-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.