7. DIN flange standard

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DIN 2635 Welding Neck Flanges

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Description

DIN 2635 Welding Neck Flanges are flanges with a welding neck, designed to connect to pipes through a neck weld, to ensure a secure and leak-proof connection. This type of flange has a neck that extends from the flange face outwards and is welded directly to the pipe. This transfers the load from the flange to the pipe, reducing the stress concentration at the base of the flange and ensuring the stability of the piping system.

Applications

DIN 2635 Welding Neck Flanges are commonly used in industries that require high strength and high pressure resistance, such as:

Oil and Gas Industry: Used in oil and gas transmission systems, including pipelines for crude oil, natural gas, and refined petroleum products.
Chemical industry: Applied in systems for conveying highly corrosive liquids and gases.
Energy Industry: Used in power plants, including steam and hot water systems.
Shipbuilding Industry: Used in piping systems on ships.
Food and beverage industry: Applied in food production and processing systems where hygiene and corrosion resistance are required.

Standards

DIN 2635 is the German standard for weld neck flanges. This standard defines specifications such as dimensions, thickness, and material of flanges, ensuring their suitability and safety when used in industrial applications.

Materials: Carbon steel, stainless steel, alloy steel, and other special alloys.
Sizes: Available from 1/2 inch to 24 inches.
Pressure: Designed for high pressures, commonly used in pressure systems from PN 6 to PN 40.
Standard: According to DIN 2635 standard.

DIN 2635 Welding Neck Flanges are the optimal choice for piping systems that require high strength, pressure resistance and good corrosion resistance. With wide applications in many industries, this flange ensures safety and efficiency in connecting and conducting liquids and gases in complex systems.

DIN 2635 Welding Neck Flanges Size and Thickness Table

Nominal Size (Inch)	Diameter (D)	Thickness (T)	Height (H)	Diameter of Bore (d)	Bolt Circle Diameter (BCD)	Number of Bolts	Diameter of Bolts (d1)
1/2″	90	11.2	40	15	60	4	12
3/4″	105	12.7	44	20	70	4	12
1″	115	14.2	47	25	80	4	12
1 1/4″	125	15.7	51	32	90	4	12
1 1/2″	140	16.8	53	40	100	4	12
2″	150	17.8	57	50	120	4	12
2 1/2″	180	20.2	64	65	140	4	16
3″	190	21.3	68	80	150	4	16
4″	230	23.9	78	100	180	8	16
5″	255	25.4	85	125	210	8	16
6″	280	26.9	90	150	240	8	20
8″	345	29.0	106	200	295	8	20
10″	405	30.6	118	250	355	12	20
12″	485	33.3	133	300	425	12	23
14″	535	35.8	146	350	485	12	25
16″	595	38.4	159	400	545	16	25
18″	635	41.0	171	450	600	16	29
20″	700	43.2	184	500	660	20	29
24″	815	47.7	210	600	775	20	32

Note:

Diameter (D): Outside diameter of the flange.
Thickness (T): Thickness of flange.
Height (H): Height from flange to weld neck.
Diameter of Bore (d): Diameter of the drilled hole.
Bolt Circle Diameter (BCD): Bolt circle diameter.
Number of Bolts: Number of bolts required.
Diameter of Bolts (d1): Diameter of bolts.

Material summary table for DIN 2635 Welding Neck Flanges

Material	Designation	Standards
Carbon Steel	1.0460 (C22.8)	DIN EN 10222-2
Stainless Steel	1.4301 (X5CrNi18-10)	DIN EN 10222-5
	1.4404 (X2CrNiMo17-12-2)	DIN EN 10222-5
Alloy Steel	1.7335 (13CrMo4-5)	DIN EN 10222-2
	1.7380 (10CrMo9-10)	DIN EN 10222-2
Nickel Alloys	2.4856 (NiCr22Mo9Nb)	DIN EN 10222-5
Copper Alloys	2.0460 (CuZn40Pb2)	DIN EN 12420
Duplex Stainless	1.4462 (X2CrNiMoN22-5-3)	DIN EN 10222-5