The ASME B16.5 Weld Neck (WN) Flange is a high-integrity fitting designed for critical, high-pressure systems. It features a tapered long hub that is butt-welded to the pipe, transferring stress to the pipe itself and reducing concentration at the base. This design provides excellent resistance to thermal shock and vibration. Available from Class 150 to 2500, it is the industry standard for extreme temperatures and volatile media in refineries, offshore platforms, and power plants.
Technical Attributes: ASME B16.5 Weld Neck Flange
Standard,ASME B16.5 (Pipe Flanges and Flanged Fittings)
Material Grades,"ASTM A105, A350 LF2, A182 F304/L, F316/L, F11, F22"
Pressure Classes,"150#, 300#, 600#, 900#, 1500#, 2500#"
Size Range,1/2"" to 24" (NPS)
Face Types,"Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ)"
Connection Type,Butt-Weld (WN)
Flange Bore,Machined to match pipe ID (Schedule)
Manufacturing,"Forged, Heat Treated, CNC Machined"
Tensile Strength,"Grade Dependent (e.g., ≥485 MPa for A105)"
Yield Strength,"Grade Dependent (e.g., ≥250 MPa for A105)"
Wall Thickness,"Match Pipe Sch (STD, 40, 80, 160, XXS)"
Heat Treatment,Normalizing / Solution Annealing / Tempering
Testing Standard,"UT, MPI, Dimensional, Hydrostatic (System)"
Surface Finish,RF: 125-250 AARH (Serrated Finish)
Hardness,"Per ASTM Grade (e.g., ≤187 HBW)"
Bolting Holes,Number and Diameter per ASME B16.5
Certification,EN 10204 3.1 / MTR
Primary Use,"High-Pressure, High-Temp & Volatile Service"
Contact: Jorge Yang
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E-mail: sales@fluvalve.com
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