The long weld neck flange should be butt welded with the pipes,it means the neck dimensions is same with the matching pipe,same diameter and wall thickness,commonly the long weld has a plain end, not a bevel end for welding.Except the neck, the Long Weld Neck（LWN） flange has a same dimensions with the welding neck flange.
Shengtian Group is a Manufacturer, Supplier, and Exporter of Long Weld Neck Flanges in hard-to-find metals. Long Weld Neck Flange has a hub that extends from the flange flat surface, which helps in accommodating the pipe more easily. SS Long Weld Neck Flange falls under the group of specialty flange, providing reinforcement in service at higher temperatures within the oil industries. A Long Weld Neck Flange is preferable within the petroleum industry as they operate under fluctuating temperature range.
Size： ½” (15 NB) to 48″ (1200NB)
Class ：150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS
Coating/Surface Treatment： Anti-rust Paint, Oil Black Paint, Yellow Transparent, Zinc Plated, Cold and Hot Dip Galvanized
Connection Type：Ring Type Joint, Lap-Joint Face, Raised Face, Flat Face, Large Male-Female, Small Male-Female, Large, Tongue & Groove, Small Tongue & Groove
Face Type ：Flat Face (FF), Raise Face (RF), Ring Joint (RJT)
Production technique ：Forged, Heat treated and machined
Test Certificates ：EN 10204/3.1B, Raw Materials Certificate, 100% Radiography Test Report, Third Party Inspection Report, etc
Test ：Direct-reading Spectrograph, Hydrostatic testing machine, X-ray detector, UI trasonic flaw detector, Magnetic particle detector
Long Weld Neck Flanges Materials
Carbon Steel Long Weld Neck Flanges:
High Temperature Carbon Steel ASTM A105: A53, A106, API 5L
Low Temperature Carbon Steel ASTM A350: LF1, LF2, LF3
High Yield Carbon Steel ASTM A694: F42, F52, F60, F65
Alloy Steel Long Weld Neck Flanges:
Alloy Steel ASTM A182: F5, F9, F11, F22, F1, F5/F5a, F91
Stainless Steel Long Weld Neck Flanges:
Stainless Steel ASTM A182: F304, F304H, F304L, F304N, F304LN, F309H, F310, F310H, F310MoLN, F316, F316H, F316L, F316N, F316LN, F316Ti, F317, F317L, F321, F321H, F347, F347H, F348, F348H, 904L
Duplex Steel Long Weld Neck Flanges:
Duplex Steel ASTM A182: Duplex 2205 (UNS S31803 – UNS S32205)
Super Duplex ASTM A182: UNS S32750 – UNS S32760
Nickel Alloy Long Weld Neck Flanges:
ASTM B160: Nickel 200 Flange | Nickel 201
ASTM B166: Inconel 600 Flange
ASTM B564: Inconel 625 Flange
ASTM B425: Incoloy 800 Flange
ASTM B564: Incoloy 825 Flange
ASTM B564: Monel K400 Flange,Monel 400
ASTM B564: Hastelloy C276 Flange | Hastelloy B, Hastelloy D, Hastelloy C-276, Hastelloy G
