This standard specifies the terms and definitions of gas rotor flow meters (also known as gas Roots flow meters), basic requirements for manufacturers, flow meter specifications, technical requirements, test methods, inspection rules and marking, packaging, transportation, storage, etc. Require. This standard is applicable to gas waist wheel flow meters (hereinafter referred to as flow meters) that measure the volume of urban gas (including natural gas, city gas and other gases and alkanes) and industrial inert gases specified in GB/T 13611.