Section 460.2354. Accuracy of metering equipment; tests; standards.

(1) The utility shall use the  applicable   provisions  of  the standards listed in R 460.2342 as criteria of accepted  practice in testing meters.

(2)   Metering equipment shall be tested by comparison with the standards that are referenced in R 460.2342.

(3)   A gas service meter that is repaired or removed from service for any cause shall, before installation, be tested and adjusted to be correct within 1% fast or 1% slow.

(4)    Every diaphragm-type gas meter shall be tested before installation and adjusted, if required, to a meter accuracy of 100% plus or minus 1% at a low flow rate and at a high flow rate so that the numerical difference between the meter accuracy at these 2 flow rates is not  more  than   1 percentage point. A low flow rate is a flow at 20% to 50% of the rated capacity of the meter. A high flow rate is a flow at 80% to 120%  of  the rated  capacity of  the meter.  The  average  meter    accuracy   of   a

diaphragm-type meter shall be defined as 1/2 the sum of the meter accuracy at the low flow test and at the high flow test.

(5)    All recording-type meters or associated instruments that  have  a timing element that serves to record the time at which the measurement occurs for billing purposes shall be adjusted at intervals of not more than 2 years so that the timing element is not in error by more than plus or minus 4 minutes in 24 hours, under laboratory conditions, as set forth in ANSI B109.1 (which is adopted by reference in R 460.2342(b)(ii)), or by more than plus or minus 10 minutes in 24 hours under field conditions.

History: 1979 AC; 1993 AACS.