ANSI B109.1 : 2000

Contents
 Disclaimer and copyright
 Preface
 History of the development of standards for
   diaphragm-type gas displacement meters
 Accredited standards committee B109
 Scope
 Part I
    Definitions
 Part II
    Construction requirements for qualifying new-type
    meters
      2.1 Scope
      2.2 Dimensions
      2.3 Meter identification
      2.4 Diaphragm identification
      2.5 Inlet identification
      2.6 Protection of meters
      2.7 Meter index
      2.8 Corrosion and chemical resistance of
             internal parts
      2.9 Corrosion and chemical resistance of
             external parts of gas meters
      2.10 Meter index window impact test
      2.11 Meter index window clearness test
      2.12 Temperature and thermal shock resistance
      2.13 Strength of meter connections
 Part III
    Performance requirements for qualifying new type
    meters
      3.1 Scope
      3.2 Meter classes
      3.3 Accuracy of meters
      3.4 Pressure and leak tests
      3.5 Noise and vibration
 Part IV
    In-service performance
      4.1 Scope
      4.2 Test requirements
      4.3 In-service performance programs
      4.4 Records
 Part V
    Meter installation requirements
      5.1 Scope
      5.2 General requirements
      5.3 Location
      5.4 Installation
      5.5 Meter shut off
      5.6 Meter support
      5.7 Meter sizing
      5.8 Spacing of meters
      5.9 Identification
      5.10 On-site inspection
      5.11 Special service requirements
Part VI
   Auxiliary devices for gas meters
      6.1 Scope
      6.2 Constant-pressure-compensating index
      6.3 Remote meter reading devices
 Part VII
    Test methods and equipment
      7.1 Scope
      7.2 Measurement reference base
      7.3 Units of measure
      7.4 Base conditions
      7.5 Meter testing systems
      7.6 Calibration of meter testing systems
 Appendix A
    Connection dimensions, nominal
 Appendix B
    Thread specifications
 Appendix C
    General service capacity equation
 Appendix D
    Meter accuracy
 Appendix E
    Prover bell calibration by physical measurement
 Appendix F
    Bar code meters and auxiliary devices

Covers a basic standard for safe operation, substantial and durable construction and acceptable performance, for diaphragm type gas displacement meters, having a gas flow rating of under 500 cubic feet per hour (14.2m/h) at 0.5 inch water column (125 Pa) differential pressure at standard conditions and designed for revenue measurement of fuel gas.