I. International Common Flange Standards
1. American Standards (US Standard Flange System)
American standard flanges are most widely used in petroleum, natural gas, chemical and petrochemical industries, characterized by pressure ratings designated as Class.
- ASME B16.5: Pipe Flanges and Flanged FittingsThe most commonly used American flange standard, covering NPS 1/2 to NPS 24, with pressure ratings Class 150, 300, 600, 900, 1500 and 2500.
- ASME B16.47: Large Diameter Steel FlangesDivided into Series A and Series B, applicable for large-diameter flanges from NPS 26 to NPS 60.
- ASME B16.36: Orifice FlangesSpecial flanges used for flow meter installation.
- MSS SP-44: Steel Butt-Welding FlangesSupplements certain dimensional and technical requirements of ASME B16.5.
- API 605: Large-Diameter Carbon Steel FlangesCommonly used in the petroleum industry for large-bore, high-pressure applications.
- API 6A: Wellhead and Christmas Tree EquipmentIncludes standards for high-pressure equipment such as flanges and connectors, widely applied in oil and gas exploitation.
2. European Standards (European Standard Flange System)
European flanges use PN pressure ratings, similar to the Chinese standard system.
- EN 1092-1: Steel Pipe Flanges — Part 1: PN SeriesThe most commonly used European flange standard, including pressure ratings PN6, PN10, PN16, PN25, PN40, PN63, PN100, etc.
- EN 1092-2: Steel Pipe Flanges — Part 2: Class SeriesEuropean flanges conforming to the American system, with pressure ratings Class 150, 300, 600, etc.
- DIN 2501 / DIN 2527: German Flange StandardsLegacy German standards, mostly replaced by EN standards now, but still frequently used in German-invested enterprises.
3. Japanese Standards (Japanese Standard Flange System)
- JIS B2220: Steel Pipe FlangesJapanese flanges mainly rated as 5K, 10K, 16K, 20K, 30K, 40K, etc.
- JIS B2210: Cast Iron Flanges
II. Chinese National Standards (GB)
1. Steel Pipe Flange Standards
- GB/T 9112～9114: Steel Pipe Flange SeriesA complete flange standard system covering:Flange types (plate flat weld, slip-on hubbed, weld neck, integral flanges, etc.)Pressure ratings (PN series: PN2.5, PN6, PN10, PN16, PN25, PN40, PN63, PN100; Class series: Class 150, 300, 600, etc.)Connection dimensions and facing types (RF, RJ, FF, MFM, etc.)
- GB/T 13402: Large-Diameter Carbon Steel Pipe Flanges
- GB/T 17186: Connecting Dimensions for Steel Flanges
2. Cast Iron Flange Standards
- GB/T 17241: Cast Iron Pipe Flanges
3. Stainless Steel Flange Standards
- GB/T 9115: Stainless Steel Flanges
III. Industrial Standards (China)
1. Petrochemical Industry (SH)
- SH/T 3406: Steel Pipe Flanges for Petrochemical IndustryThe most widely used in petrochemical engineering, with content similar to GB/T 9112～9124 but with additional industry-specific requirements.
- SH/T 3405: Steel Pipe Size Series for Petrochemical Industry
2. Chemical Industry (HG)
- HG/T 20592: Steel Pipe Flanges (PN Series)Commonly used in the chemical industry, largely consistent with EN 1092-1.
- HG/T 20615: Steel Pipe Flanges (Class Series)Chemical industry flange standard following the American system.
3. Electric Power Industry (DL)
- DL/T 695: Steel Butt-Welding Fittings and Flanges for Power Stations
4. Shipbuilding Industry (CB)
- CB/T 46-1999: Marine Flanges
IV. Other Common Standards
- ISO 7005-1: International Standard Flanges (PN Series)
- ISO 7005-2: International Standard Flanges (Class Series)
- BS 1560: British Standard Flanges
V. Summary (Core Most Commonly Used Standards)
In global engineering projects, the most common and essential flange standards are:
- ASME B16.5 (US Standard)
- ASME B16.47 (US Standard, Large Bore)
- EN 1092-1 (European Standard, PN)
- JIS B2220 (Japanese Standard)
- GB/T 9112～9124 (Chinese National Standard)
- HG/T 20592 / 20615 (Chemical Industry)
- SH/T 3406 (Petrochemical Industry)
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