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Connection types and classification of the new standard flanges

DataTime:[2016-11-28]
GB flanges usually are used in pairs to connect to the pipeline within the pipeline project, which is a disc - shaped part. Different pressure flange with various thickness and bolt. Give the attachment of other objects position around the shaft protruding edge, collar or ring these are known as flange, like ventilation pipe connection.
GB flange

Specification/ Dimension of GB flanges


  GB9119,2—88 GB9119,2—88
in NPS  10kg=1.0MPa NPS  16kg=1.6MPa
OD Dia of bolts Holes Thickness OD distance of bolts Dia of bolts Holes Thickness
3/8 DN10 50 60 14 4 14 DN10 90 60 14 4 14
1/2 DN15 59 65 14 4 14 DN15 95 65 14 4 14
3/4 DN20 105 75 14 4 16 DN20 105 75 14 4 16
1 DN25 115 85 14 4 16 DN25 115 85 14 4 16
11/4 DN32 140 100 18 4 18 DN32 140 100 18 4 18
11/2 DN40 150 110 18 4 18 DN40 150 110 18 4 18
2 DN50 165 125 18 4 20 DN50 165 125 18 4 20
21/2 DN65 185 145 18 4 20 DN65 185 145 18 4 20
3 DN80 200 160 18 8 20 DN80 200 160 18 8 20
31/2 DN100 220 180 18 8 22 DN100 220 180 18 8 22
4 DN125 250 210 18 8 22 DN125 250 210 18 8 22
5 DN150 285 240 22 8 24 DN150 285 240 22 8 24
6 DN200 340 295 22 8 24 DN200 340 295 22 8 26
8 DN250 395 350 22 12 26 DN250 405 355 26 12 29
10 DN300 445 400 22 12 28 DN300 460 410 26 12 32
12 DN350 505 460 22 16 30 DN350 520 470 26 16 35
14 DN400 565 515 26 16 32 DN400 580 525 30 16 38
16 DN450 615 565 26 20 35 DN450 640 585 30 20 42
18 DN500 670 620 26 20 38 DN500 715 650 33 20 46
20 DN600 780 725 26 20 42 DN600 840 770 36 20 52

Description of GB flanges


GB flange system is Chinese grade flange, this system is made according to ansi flange system and din flange system, include GB/T 9112 - 9113.4 - 2000, DN10-DN2000, GB/T 17241.1 - 17241.7, DN10 - DN4000, GB/T 15530.1 - 15530.8, DN10-DN1800 etc., Pressure grade from PN0.6,1.0,1.6,2.5,4.0,6.4,Mpa
  • Type: WN Forged Flange
  • Material: Carbon steel: A105,SS400,SF440 RST37.2,S235JRG2,P250GH,C22.8, Stainless Steel: F304 F304L F316 F316L 316Ti, Copper etc.
  • Standard: GB/T 9112 - 9113.4 - 2000, DN10-DN2000, GB/T 17241.1 - 17241.7,GB573-581-76,GB10746-10749-89
  • Size: DN10-DN4000
  • Pressure: PN 0.6Mpa, 1.0Mpa, 1.6Mpa, 2.5Mpa, 4.0Mpa, 6.4Mpa
  • Packing: No Fumigate or Fumigate Plywood/Wood Pallet or Case
  • Surface Treatment: Anti-rust Oil, Transparent/Yellow/Black Anti-rust Paint,Zinc,Hot dipped Galvanized.
  • E-catalogue: Available , please visit catalogue of flange

  • Usage: Oil Field, Offshore, Water System, Shipbuilding, Natural Gas, Electric Power, Pipe Projects etc.

The modern standard flange connection is an important connection from the pipeline construction. The usage of bolts to two pipes, fittings or equipment is connected together referred to as the flange connection, but in addition backward and forward flanges, you need to add some flange gasket into a fixed connection. Many of the fittings and equipment which currently have flanges may also be connected by flange.

The newest standard flange may be separated into the threaded connection flange and welding flange. Low pressure and small diameter cases are suitable for wire flanges, while welding flanges tend to be frequently used in high / low pressure and large diameter situations. Flanges with assorted pressure can have different thickness, as well as the diameter and number of the connecting bolts. In accordance with the pressure level, the flange gasket can also get a number of materials, like low pressure asbestos gasket, high-pressure asbestos gasket, metal gasket, etc.. Can withstand great pressure, flange connection is easy to use.

The new standard flange connection is trusted in industrial pipeline. In this series, the pipe diameter is small , the stress is low, it's impossible to view the flange connection. However, should you be from the boiler room or production site, the flange pipe and equipment will probably be offered to anyplace.

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