Pennsylvania Code › Title 52 - PUBLIC UTILITIES › Part I - Public Utility Commission › Subpart C - Fixed Service Utilities › Chapter 59 - GAS SERVICE › SERVICE AND FACILITIES › Section 59.15 - Measurement of gas at higher than standard service pressure

Current through Register Vol. 54, No. 28, July 13, 2024
(a)
Pressure-recording
					 equipment
. If gas is measured to customers through displacement meters
					 at a pressure greater than standard service pressure, the meters shall be
					 equipped with reliable pressure-volume recording gauges or other devices for
					 accurately determining the quantity of gas which has passed through the meter
					 in accordance with contract or tariff provisions.
(b)
Determination of
					 multiplier
. In computing the volume of gas at a given pressure base
					 from a pressure-volume chart, the multiplier shall be obtained by the weighted
					 average method, which consists of determining the average pressure for each
					 indicated unit volume on the chart.
(c)
Fixed pressure factor
					 measurement
. If the gas metering pressure can be maintained at a
					 constant level so that it will not vary by more than plus or minus 1.0% of the
					 absolute metering pressure, the quantity of gas corrected for pressure for
					 billing purposes may be determined by multiplying the uncorrected volume by the
					 factor of Metering Pressure Plus Atmospheric Pressure Divided by Base Pressure
					 or by a special index with gearing to perform this calculation. The special
					 index shall meet the specifications of ANSI Standard B109.1, §
											6.2(1986)  or
					 ANSI Standard B109.1, §
											6.9(1986). The
					 ability of the regulator to maintain the constant pressure shall be verified at
					 or prior to installation. Verification will be established by the use of a
					 verified pressure-indicating gauge (accuracy: ANSI B40.1 Grade 3A), or a
					 pressure-recording gauge, at both high and low flow conditions. When customer
					 load is measured with a meter with a rated capacity of 1,500 cubic feet per
					 hour or less, with metering pressure less than 3 psig, the performance of the
					 regulator shall be verified in accordance with the test schedule of the
					 downstream meter, established under §
											59.21 (relating to meter tests).
					 When customer load is measured with a meter with a capacity of over 1,500 cubic
					 feet per hour or metering pressure of 3 psig or more, the performance of the
					 regulator shall be verified at least every 5 years, except that those installed
					 before January 1, 1990, shall be verified at least every 2 years.
(d)
Determination of static and
					 differential pressure
. In computing the volume of gas at a given
					 pressure base from an orifice meter chart, the average static pressure and the
					 average differential pressure shall be determined for periods not exceeding 1
					 hour. If pressure variations are extreme during the hour, the average shall be
					 determined for 15-minute intervals.
(e)
Mechanical devices
.
					 Mechanical devices may be substituted for the method of computing orifice meter
					 charts set forth in this section.
The provisions of this §
													59.15 issued and amended under
						  Public Utility Code,
						  66 Pa.C.S. §
														§
														501,
						  1301,
						  1304,
						  1501,
						  1502,
						  1504,
						  1507 and
						  1508.