(C) Any suitable test that is approved by the commission.
(iii) During the pressure test, the meter must be checked for leaks by 1 of the
(A) Immersion test.
(B) Soap test.
(C) Pressure drop test of a type that is approved by the commission.
(d) As part of its rate book, a utility shall file, for commission approval, a statement
of its policy with regard to testing meter accuracy upon a customer’s request. In the
absence of a filed policy approved by the commission, the utility shall adhere to both of
the following provisions:
(i) A utility shall test meter accuracy upon the request of a customer if the customer
does not request a test more than once every 2 years and if the customer agrees to accept
the results of the test as the basis for determining the difference claimed. A charge must
not be made to the customer for the first test in any 5-year period, but if subsequent tests
during the same period, for the same customer, show the meter to be within the allowable
limits of accuracy, the utility may charge the customer an amount for subsequent tests
which is uniform and which does not exceed the utility’s direct cost thereof, plus a
reasonable charge for administrative overhead. The customer may be present at the test if
he or she makes a request before the test.
(ii) A written report must be made to the customer by the utility. The report must
state the results of the test. A record of the test must be kept by the utility.
(e) A utility shall make periodic tests of meters, associated devices, and instruments
to ensure their accuracy. The tests must be conducted according to the following
schedule, unless otherwise approved by the commission. A utility may test meters more
frequently than provided in the following schedule without commission approval:
(i) Positive displacement diaphragm-type meters that have capacities of less than
500 cubic feet per hour, not to exceed 123 months.
(ii) Positive displacement diaphragm-type meters that have capacities over 500 cubic
feet per hour, not to exceed 87 months.
(iii) Rotary meters that have capacities of less than 15,000 cubic feet per hour, which
may be tested in place, not to exceed 51 months.
(iv) Rotary meters that have capacities of 15,000 cubic feet per hour or more, which
may be tested in place, not to exceed 27 months.
(v) Other meter types, such as turbine, Coriolis, 4-Path or greater ultrasonic, or other
metering technology, which may be tested in place when possible, not to exceed 27
(vi) Orifice meters, 2 times per year with intervals not to exceed 7.5 months.
(vii) Gas instruments, such as base volume, base pressure, and base temperature-
correcting devices, must be checked for calibration at intervals that correspond to the
schedule for their associated meters. The testing interval must not exceed 51 months.
(viii) Test bottles, deadweight testers, certified test meters, not to exceed 123
(ix) Meter testing systems must be calibrated when first installed and after
alterations, damages, or repairs that might affect accuracy. To ensure that the accuracy of
a meter testing system is maintained on a continuous basis, a daily leakage test must be
made and a weekly accuracy test with a comparison meter of known accuracy must be