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Hebei haihao high pressure flange & pipe fitting group was established in 1982, located in Mengcun County the hometown of pipe fittings in China.

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JIS B2220 Steel pipe flanges


This Standard specifies steel pipe flanges (hereafter referred to as “flanges”) of nominal size 10A to 1500A for nominal pressure 5K, 10K, 10K light type,16K, 20K and 30K which are used to join parts for piping, such as steel pipes and valves, in ordinary(1),pressure (2), high pressure (3), high temperature (4), alloy steel pipes (5), strainless steel pipes (6) piping for steam, air, gas, water, oil, etc. (7).


  • Piping using Carbon steel pipes for ordinary piping of JIS G 3452 and arc welded carbon steel pipes of JIS G 3457.
  • Piping using Carbon steel pipes for pressure service of JIS G 3454.
  • Piping using Carbon steel pipes for high pressure service of JIS G 3455.
  • Piping using Carbon steel pipes for high temperature serivce of JIS G 3456.
  • Piping using Alloy steel pipes of JIS G 3458.
  • Piping using stainless steel pipes of JIS G 3459 and large diameter welded stainless steel pipes of JIS G 3468.
  • Integral flange, which is to be used as part of some other equipment or components, shall also be within the scope of this Standard.

Weld Neck Flange
Integral Flange
Blind Flange
Socket Weld Flange
Threaded Flange
Plate Flange
Slip On Flange Type A
Slip On Flange Type B
Slip On Flange Type C
Loose Flange/Lap Joint Flange

Classification of flanges and the designation

Classification of flange Designation Figure
Welding flange Silp on plate flange SOP Silp on plate flange
Slip on hubbed flange SOH Slip on hubbed flange
Socket welding flange SW Socket welding flange
Welding neck flange WN Welding neck flange
Lap joint flange LJ Lap joint flange
Threaded flange TR Threaded flange
Intergral flange IT Intergral flange
Blank flange BL Blank flange

Types of nominal pressure 20 K and 30 K slip on hubbed flanges

Classification of flange Type Figure
Slip on hubbed flange Type A Slip on hubbed flange A
Type B Slip on hubbed flange b
Type C Slip on hubbed flange c

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Related Tags: Flange Standard (5)  JIS Flange (1)  

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