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7. DIN flange standard

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DIN 2633 Welding Neck Flanges

DIN 2633 Welding Neck Flanges
  • Material: SS400, Q235, A105, 304, 304L, 316, 316L, (Hastelloy C276), 2.4858 (Alloy 825)
  • Standard: DIN
  • Pressure: PN6, PN10, PN16, PN25, PN40
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Description

DIN 2633 Welding Neck Flanges are designed to connect pipes to each other, to equipment or to other systems in the industry. They have a long neck, thicker at the weld point for increased strength and durability. These flanges are large diameter, with bolt holes all around and are manufactured according to DIN 2633 standard.

Applications

  • Oil and Gas Industry: Connecting oil and gas pipelines, tanks, and pressure equipment.
  • Chemical industry: Used in chemical piping systems, tanks and process equipment.
  • Energy industry: Applications in power plants, steam systems and heating systems.
  • Water and water treatment industry: Used in water supply and drainage systems, wastewater treatment.
  • Manufacturing and production industry: Connecting equipment in the production line.

Standards

  • Category: Weld neck flange PN16.
  • Materials: Carbon steel, stainless steel, copper alloy, and other alloys.
  • Size: Nominal diameter (DN) from DN10 to DN600.
  • Working pressure: Designed for nominal pressure PN16.
  • Construction: Flanges are machined with bolt holes in accordance with DIN standards, the contact surface can be flat (FF), raised (RF), ring joint (RTJ), or other forms as required.
  • Surface finish: Ensure gloss and smoothness according to technical requirements to ensure tightness when connecting.

DIN 2633 Welding Neck Flanges are a popular choice in many industries due to their high pressure resistance and superior strength. They are manufactured with high precision, ensuring reliability and safety during use.

DIN 2633 Welding Neck Flanges (PN16) Dimensions and Thickness Table

DN (Inch) DN (mm) Outer diameter (D) (mm) Bolt hole spacing (K) (mm) Bolt hole diameter (d) (mm) Number of bolt holes Neck diameter (d1) (mm) Flange thickness (t) (mm) Neck thickness (C) (mm)
1/2″ 15 95 65 14 4 21.3 14 3.6
3/4″ 20 105 75 14 4 26.9 16 3.6
1″ 25 115 85 14 4 33.7 16 4.5
1 1/4″ 32 140 100 18 4 42.4 18 4.5
1 1/2″ 40 150 110 18 4 48.3 18 4.5
2″ 50 165 125 18 4 60.3 20 4.5
2 1/2″ 65 185 145 18 4 76.1 22 4.5
3″ 80 200 160 18 8 88.9 24 4.5
4″ 100 220 180 18 8 114.3 24 4.5
5″ 125 250 210 18 8 139.7 26 4.5
6″ 150 285 240 22 8 168.3 26 4.5
8″ 200 340 295 22 12 219.1 28 4.5
10″ 250 405 355 26 12 273.0 30 4.5
12″ 300 460 410 26 12 323.9 32 4.5
14″ 350 520 470 26 16 355.6 34 4.5
16″ 400 580 525 30 16 406.4 36 4.5
18″ 450 640 585 30 20 457.2 38 4.5
20″ 500 715 650 33 20 508.0 40 4.5
24″ 600 840 770 36 20 609.6 42 4.5

Note:

  • DN (mm) : Nominal diameter in metric system.
  • D (mm) : Outside diameter of flange.
  • K (mm) : Distance between bolt holes.
  • d (mm) : Bolt hole diameter.
  • Number of bolt holes : Number of bolt holes on the flange.
  • d1 (mm) : Welding neck diameter.
  • t (mm) : Flange thickness.
  • C (mm) : Welding neck thickness.

DIN 2633 Welding Neck Flanges (PN16) Material Summary Table

Material Type Material standards Main ingredient Application
Carbon steel ASTM A105 C, Mn, P, S Widely used in pressure piping systems, petroleum, chemical and other industries.
Stainless Steel ASTM A182 F304/F316 Fe, Cr, Ni, Mo High corrosion resistance, used in food, chemical, oil and gas and energy industries.
Alloy steel ASTM A182 F11/F22 Cr, Mo Withstands high heat and pressure, used in chemical industry and power plants.
Copper alloy ASTM B61, B62 Cu, Ni, Zn Good corrosion resistance, used in marine industry, chemical industry and water supply and drainage systems.
Nickel alloy ASTM B564 Inconel 600/625 Ni, Cr, Fe, Mo High heat and corrosion resistance, used in chemical and petroleum industries.
Duplex steel ASTM A182 F51/F53 Fe, Cr, Ni, Mo, N Excellent corrosion resistance, used in oil and gas, chemical and energy industries.
Super duplex stainless steel ASTM A182 F55/F60 Fe, Cr, Ni, Mo, N Extremely corrosion resistant and durable, used in harsh environments such as the oil and gas and chemical industries.

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