ANSI B109.1:2000 pdf free.DIAPH RAGM-TYPE GAS DISPLACEMENT M ETERS.
1.21 LIFE TEST, ACCELERATED. A test under controlled conditions simulating long-term operation designed to determine long-term maintenance and performance characteristics within a relatively short period of time. 1.22 MAOP. Maximum Allowable Operating Pressure equivalent to manufacturer’s maximum working pressure. 1.23 METER ACCURACY. 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 and 1.1, ACCURACY, METER.) 1.24 METER CLASS. A designation for different ranges of meter capacity. The class for a given type of meter is determined by its minimum capacity of 0.6 specific gravity gas at 0.5 inch of water column (125 Pa) differential pressure, under specified test conditions. The capacity so determined must equal or exceed the class designation, but be less than the next higher class. 1.25 METTER, DISPLACEMENT. A meter that uilizes the principle of atermately flling and emptying compartments of known size and totals the number of times the cycle is accomplished, thereby indicating the volume of gas passing through the meter. 1.26 METER, GAS. A device for measuring a volume of flowing gas. 1.27 METER, NEW. A meter of all new materials as received from the manufacturer; never used in service. 1.28 METER, NEW TYPE. A gas meter sufficiently different in design or materials of construction (such as diaphragm material, cubic feet per tangent revolution, ratio of valve-to-diaphragm area, etc.) so affecting performance as to require qualification as a new-type meter under this standard. 1.29 METER, ROTARY DISPLACEMENT. A meter that utilizes the principle of flling and emptying rotating compartments of known size and totals the number of times the cycle is accomplished, thereby indicating the volume of gas passing through the meter.1.35 PRESSURE DIFFERENTIAL. The difference in pressure between two points in a flowing gas system. 1.36 PRESSURE DROP. The loss in pressure between two points in a fluid flow system. 1.37 PRESSURE, GAUGE. Pressure measured relative to atmospheric pressure taken as zero. Abbreviated psig. 1.38 PRESSURE, METER. The pressure in a meter under operating conditions. (Usually considered to be the meter’s inlet pressure.)ANSI B109.1 pdf download.