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Weld Neck Flanges Specs

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Heavy Weld Neck Flange Details

Weld Neck (WN) Flanges

Engineered with a high-tapered hub that transitions stress directly to the connecting pipe. This structural design prevents stress concentrations at the flange plate base, making them highly reliable inside thermal fluctuation and heavy pipeline vibration environments.

Class 150 to Class 2500 Raised Face (RF) & RTJ

Technical Specifications

Parameter Standard Specification Details & Limits
Size Range 1/2" NB to 48" NB (Nominal Bore)
Pressure Class Rating Class 150, Class 300, 600, 900, 1500, 2500 Lbs
Flange Face Types Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ)
Grades Stocked F304, F304L, F316, F316L, F321, F347, Duplex F51, Super Duplex
Standard Specs ASME B16.5, ASME B16.47 Series A & B, EN 1092-1
Custom Services Custom beveling matching pipe schedule (Sch 40S, 80S, XXS)

Industrial Applications

  • Gas Pipelines: Critical distribution nodes demanding leakage-free links.
  • Cryogenics: Low temperature storage processing plants carrying liquid gases.
  • Chemical Reactors: Connecting nozzles of high pressure autoclave vessels.