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Weld Neck Flanges

Pooja Steel India > Weld Neck Flanges
Weld Neck Flanges

Weld Neck Flanges are designed to be joined to a piping system by butt welding. They are preferred for high-stress applications due to their long necks, which help transmit stresses to the pipeline. The gradual transition of thickness from the base of the hub to the wall thickness at the butt weld provides important reinforcement. The bore of Weld Neck flanges matches the bore of the pipeline, reducing turbulence and erosion.

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Description

Weld Neck Flange Standard Specifications
Specification Description
Dimension Standard ANSI B16.5, MSS SP44, Custom Drawings
Size Range 1/2″ (15 NB) to 48″ (1200 NB)
Pressure Classes 150, 300, 600, 900, 1500, 2500 LBS
DIN Standards DIN2527, DIN2642, DIN2635, DIN2638, DIN2673, etc.
BS Standards BS4504, PN6, PN10, PN16, PN25, PN40, etc.
API Standards PSI-2000/3000/5000/10000, etc.
JIS Standards 2220-2004 5k/10k/16k, etc.
Flange Face Types FF (Flat Face), RF (Raised Face), RTJ (Ring Type Joint)
Weld Neck Flange Material & Grades

Weld neck flanges are available in a variety of materials and grades to suit different pressure and temperature requirements. Here are some common options:

  • Stainless Steel: ASTM A 182, A 240 (See grades below – 304, 316, 321, 347, 904L)
  • Duplex & Super Duplex Steel: ASTM / ASME A/SA 182 F 44, F 51, F 53, F 55, F 60, F 61
  • Carbon Steel: ASTM / ASME A/SA 105, A 350, A 181 LF 2, A516 Gr.70, A36, A694, etc.
  • Low Temp Carbon Steel: ASTM A350 LF2, LF3
  • Alloy Steel: ASTM / ASME A/SA 182 & A 387 F1, F5, F9, F11, F22, F91
  • Copper Alloy Steel: ASTM SB 61, SB62, SB151, SB152
  • Nickel Alloy: ASTM SB564, SB160, SB472, SB162, etc.

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