The Long Weld Neck Flanges are the best designed butt-welded flange of those currently available becuase of its inherent structural value. It is expensive because of the design.
Their static strength is equal to Slip On flanges, but their fatigue strength 50% greater than double-welded Slip On flanges.
Long welding neck flange, lwn flanges are similar to a standard Welding Neck flanges, but the “Neck” is considerably longer than other flanges. LWN flange is often used as a nozzle for a barrel or column. In addition, there are the type LWN Heavy Barrel (HB) and the Equal LWN Barrel (E); they have a different shape and a thicker “Wall”.
Tube OD sizes: 3/8 to 2 inches
Materials:
Carbon steel: A105,SS400,SF440 RST37.2,S235JRG2,P250GH,C22.8
Stainless Steel: F304 F304L F316 F316L 316Ti, Copper etc.
Vacuum range
Elastomer seal: >=1 x 10^-8 Torr - High vacuum
EVAC metal seal: >=1 x 10^-11 Torr - UHV
Temperature range
Viton: -20°C to 200°C
Silicone: -50°C to 230°C
Buna: -30°C to 110°C
EVAC metal seal: -270°C to 150°C
Packing: No Fumigate or Fumigate Plywood/Wood Pallet or Case
Surface Treatment: Anti-rust Oil, Transparent/Yellow/Black Anti-rust Paint,Zinc,Hot dipped Galvanized.
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