This standard applies to diaphragm-type gas displacement meters, designed for revenue measurement of fuel gas, having a flow rating of 500 cubic feet per hour (14.16m(3)/h) capacity and over 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 the designated flow-rate ranges.

Part 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 meters covered by this standard.