This standard specifies terms, definitions and symbols, classification and labelling, structure and materials, requirements, test methods, inspection rules, marking, label, operating instructions and packing, transport and storage of gas pressure regulators (hereinafter referred to as regulators) used in the transmission and distribution system of city gas (manufactured gas and natural gas, the same below).
This standard is applicable to the regulators with a nominal diameter up to 300mm, a lower limit not less than the dew point temperature of the gas, an operating temperature range (temperature range of the media and proper at which the regulators components and fixtures may work at normal state) from -20℃ to 60℃, and an inlet pressure up to 4.0MPa.
This standard may be a reference to the regulators used for transmission and distribution system of pipeline liquefied petroleum gas and liquefied petroleum gas mixed with air.
This standard is not applicable to the pressure stabilizer, bottled gas regulators and regulators for dimethyl ether.
Every pressure value not indicated in this standard is the gauge pressure value, in MPa.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the normative document (including any amendments) applies.
GB/T 191 "Packaging-Pictorial Marking for Handling of Goods"(GB/T 191-2008, ISO 780:1997, MOD)
GB/T 229 "Metallic Materials-Charpy Notch Impact Test" (GB/T 229-2007, ISO 148-1:2006, MOD)
GB/T 699 "Quality Carbon Structural Steels"
GB/T 1173 "Casting Aluminium Alloys"
GB/T 1220 "Stainless Steel Bars"
GB/T 1239.2 "Cold Coiled Helical Springs Technical Specifications-Part 2: Compressions Spring"
GB/T 1348 "Spheroidal Graphite Iron Castings" (GB/T 1348-2009, ISO 1083:2004, MOD)
GB/T 1527 "Drawn Tube of Copper and Copper Alloys"
GB/T 1591 "High Strength Low Alloy Structural Steels"
GB/T 1690 "Rubber Vulcanized or Thermoplastic-Determination of the Effect of Liquids"
GB/T 3191 "Aluminium and Aluminium Alloys Extruded Bars, Rods"
GB/T 3452.1 "Fluid Power Systems-O-rings-Part 1: Inside Diameters, Cross-sections, Tolerances and Size Identification Code"(GB/T 3452.1-2005, ISO 3601-1:2002, MOD)
GB/T 3452.2 "Fluid Power Systems-O-rings-Part 2: Quality Acceptance Criteria" (GB/T 3452.2-2007, ISO 3601-3:2005, IDT)
GB/T 6388 "Transport Package Shipping Mark"
GB/T 7306.1 "Pipe Threads with 55 Degree Thread Angle where Pressure-tight Joints are Made on the Threads-Part 1: Parallel Internal and Taper External Threads" (GB/T 7306.1-2000, eqv ISO 7-1:1994)
GB/T 7306.2 "Pipe Threads with 55 Degree Thread Angle where Pressure-tight Joints are Made on the Threads-Part 2: Taper Internal and External Threads" (GB/T 7306.2-2000, eqv ISO 7-1:1994)
GB/T 9112 "Types and Parameters for Steel Pipe Flanges"
GB/T 9440 "Malleable Iron Castings"
GB/T 9969 "General Principles for Preparation of Instructions for Use of Industrial Products"
GB/T 12226 "General Purpose Industrial Valve-Specification of Flake Graphite Iron Castings"
GB/T 12227 "General Purpose Industrial Valve-Specification of Spheroidal Graphite Iron Castings"
GB/T 12229 "General Purpose Industrial Valve-Specification of Spheroidal Graphite Iron Castings"
GB/T 12716 "Pipe Threads with the Thread Angle of 60 Degrees Where Pressure-tight Joints are Made on the Threads" (GB/T 12716-2002, ASME B1.20.1:1992, EQV)
GB/T 13306 "Plates"
GB/T 13384 "General Specification for Packagings of Mechanical and Electrical Products"
GB/T 15115 "Die Casting Aluminum Alloys"
GB/T 23934 "Hot Coiled Helical Compression Springs-Technical Specifications"
HG/T 20592 "Steel Pipe Flanges (PN Series)"
HG/T 20615 "Steel Pipe Flanges (Class Designated)"
JB/T 7944 "Sampling Procedures for Inspection by Attributes of Coied Helical Springs"
