ANSI B109.1:2000 pdf download.DIAPHRAGM-TYPE GAS DISPLACEM ENT METERS(Under 500 Cubit Feet Per Hour Capacity).
ANSI B109.1 applies to diaphragm-type gas displacement meters, designed for revenue measurement of fuel gas, having a flow rating of less than 500 cubic feet per hour (14.16m31h) capacity at 0.5 inch water column (125 Pa) differential pressure at standard conditions.
Part I comprises a list of definitions and terms used throughout the standard.
Part ii covers the construction requirements for qualifying new-type meters in (he designated flow-rate ranges.
Pan III covers the performance requirements for qualifying new-type meters in the designated flow-rate ranges.
Part IV covers the “in-service” performance requirements for diaphragm-type meters in the designated flow-rate ranges.
Part V addresses installation requirements for these meters
Part VI pertains to auxiliary devices used with gas meters covered by this standard.
Part VII covers test methods and equipment.
1.1 ACCURACY, METER. The degree to which a meter correctly measures the volume of gas passing through it, determined by comparing the volume registered by the meter with that registered by the prover. (See Appendix D for methods of expressing meter accuracy.)
1.2 ADAPTOR PLATE, INSTRUMENT. A specially designed plate mounted between a meter and an instrument to provide for a proper drive to the instrument.
1.3 AUXILIARY DEVICES. Devices used with a meter to provide an adjustment of the meter reading, to permit obtaining special information, or to transmit information o a remote location.
1.4 BADGE. A permanent plate, aflixed in a conspicuous place on a meter, containing basic meter information.
1.5 BASE CONDI11ONS. The standard base conditions of pressure and temperature for the volumetric measurement of natural gas. ANSI/API 2562-1969, has established 60°F (15.6°C) and 14.73 psi (101.56 kPa) as the base temperature and pressure to which all volumes are commonly referred.
1.6 BOTTLE, CUBIC FOOT. A specially constructed and calibrated bottle, usually immersion type. complete with an immersion tank containing a light oil of low vapor pressure, with the bottle suspended over the tank by means of a suitable cord and pulley so that the bottle may be immcrsed in the oil between two graduations, top and bottom. The bottle is constructed so that exactly I cubic foot of air is displaced when the bottle is immersed between the two marks. The calibration of the bottle must be traceable to the National Bureau of Standards.
l7 CAPACITY, RATED. The capacity obtained by rounding to the nearest multiple of 5 cth. The average readings of 10 randomly chosen production-type meters representing a particular meter model.
1.8 CIRCLE(S), READING. Graduated index circles with hands that register the accumulated volume of gas passed through the meter.
1.9 CIRCLE(S), TEST. A graduated circle provided with a rotating pointer (proving hand) on the meter index, used for testing the meter and for indicating gas flow. Also referred to as index test dial or proving circle.
1.10 CONNECTIONS, METER. The integral parts of the meter designed for attachment to meter swivels, pipe, or other piping components.
1.11 CONSTANT-PRESSURE-COMPENSATING INDEX. An index used in conjunction with a gas meter operated at a constant pressure, other than the contract base pressure, to indicate gas volume corrected o a contract base pressure.
1.12 CUBIC FOOT, METERED. The quantity of gas that occupies 1 cubic foot when under pressure and temperature conditions existing in the meter.
1.13 CUBIC FOOT, STANDARD. (See ANSI Z132.) That quantity of gas that under an absolute pressure of 14.73 psi (101.56 kPa) and at a temperature of 60°F (15.6°C) occupies a volume of 1 cubic foot.
1.14 CUBIC METER, STANDARD. Tha quantity of gas that under an absolute pressure of 101.325 kPa (14.696 lbfIin2) and a temperature of 288.15°K (59°F) occupies a volume of I cubic meter.
1.15 FLOW RATE, PILOT. A minimum flow rate that a meter is required to register with a prescribed accuracy.
1.16 HUBS, METER. Same as 1.10, CONNECTIONS, METER.
1.17 INDEX, MtThR. The mechanism that displays the volume of gas that has passed through the meter.
1.18 INDEX RATE. The uncorrected flow rate calculated by dividing the registration by time.
1.19 INDEX, TEMPERATURE COMPENSATING. A meter index used to display corrected volume under flowing gas conditions to a base temperature, commonly 60°F (15.6°C).
1.20 INDEX TEST DIAL. See 1.9, CIRCLE(S), TEST.ANSI B109.1 pdf download.