Weld Neck (WN)
A WNRF (Weld Neck Raised Face) flange is a butt-welded flange with a long tapered hub designed to provide smooth stress transition from flange to pipe. The Raised Face (RF) ensures proper gasket seating and improved sealing performance.
It is widely used in high-pressure and high-temperature piping systems in oil & gas, refineries, petrochemical plants, and offshore installations.
Manufactured as per ASME B16.5 (up to 24") and ASME B16.47 (above 24").
A WNRF (Weld Neck Raised Face) flange is a butt-welded flange with a long tapered hub designed to provide smooth stress transition from flange to pipe. The Raised Face (RF) ensures proper gasket seating and improved sealing performance.
It is widely used in high-pressure and high-temperature piping systems in oil & gas, refineries, petrochemical plants, and offshore installations.
Manufactured as per ASME B16.5 (up to 24") and ASME B16.47 (above 24").
(Selection depends on design pressure & temperature.)
🔹 Common Material Grades
🔸 Carbon Steel
ASTM A105
ASTM A350 LF2 (Low Temp)
🔸 Alloy Steel
ASTM A182 F11
ASTM A182 F22
🔸 Stainless Steel
ASTM A182 F304 / F304L
ASTM A182 F316 / F316L
🔸 Duplex / Super Duplex
ASTM A182 F51
ASTM A182 F53
🔹 Size Range
Standard Nominal Size
ASME B16.5 ½” to 24”
ASME B16.47 Series A/B 26” to 60”
🔹 Pressure Class (Rating)
Class 150
Class 300
Class 400
Class 600
Class 900
Class 1500
Class 2500
🔹 Schedule (Matching Pipe Thickness)
The flange bore must match pipe schedule:
SCH 10
SCH 20
SCH 30
SCH 40 / STD
SCH 60
SCH 80 / XS
SCH 120
SCH 160
XXS
🔹 Technical Features
Butt-weld end (bevel as per ASME B16.25)
Raised Face gasket surface (125–250 AARH standard finish)
Suitable for high stress and cyclic loading
Excellent for critical hydrocarbon service
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