Connection types and classification of the new standard flanges

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.

Specification/ Dimension of GB flanges

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	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

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Description of GB flanges

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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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