ANSI/ASME B16.5 ASTM A403 304 RTJ 900# LWN Flange | Integral Flange

Long weld neck flange(LWN flange) is also call integral flange, it means a welding neck flange has a very long neck.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 LWN flange has a same dimensions with the welding neck flange. In addition, there are also the type LWN Heavy Barrel (HB) and the Equal LWN Barrel (E); they have a different shape and a thicker “Wall” which name is Nozzle .

ANSI/ASME B16.5 ASTM A403 304 RTJ 900# LWN Flange | Integral Flange

Data Of Haihao Group Flanges:

Size:  1/2” – 160”.  DN15 – DN4000 mm

Standard:   ANSI/ASME B16.5, ANSI/ASME B16.47, BS4504, BS3293, EN 1092, DIN2631,DIN2632,DIN2633, DIN 2634, DIN2635, DIN2636, DIN2637, DIN2638, JIS B2220, SABS / SANS 1123 , GOST12821-80 Flange, MSS SP-44 FLANGE, API 6A, 6B, 6BX weld neck FLANGE, ISO 7005 Weld neck flange. NFE 29203 Weld neck flange, KS B1503 , UNI 2280-67 ,UNI 2281-67 ,UNI 2282-67 ,UNI 2283-67 , UNI 2284-67, HG20595,AS2129.

Material: 

Carbon steel:  ASTM A105, A181, ASTM A516 GR.60, GR.70, ASTM A694 F42, F46, F52, F56, F60, F65, F70, ST37, ST45.8, C22.8, S235, S235JRG2, P235GH, P245GH, P250GH, P265GH, P355GH, S355J2, 16MN, 20MN, Q235, 20#, CT20, SS400.  

Stainless steel:  ASTM A182 F304, F304L, F316, F316L, F321, F321H, F304H, F316H, F347H, 1.4301, 1.4306, 1.4401, 1.4404, 1.4541, 1.4571, SUS304, SUS316.

Alloy Steel:   ASTM A350 LF2, CL1/CL2, ASTM A182 F5, F9, F11, F12, F22, F91.

Duplex Steel:  S31803  /  F51  /  S32205  /  F60  /  1.4462

Super Duplex:  S32750  /  F53  /  1.4410  /  S32760  /  F55  /  1.4501

ANSI/ASME B16.5 ASTM A403 304 RTJ 900# LWN Flange | Integral Flange

Sealing Face Of The Long Weld Neck Flange:

The sealing face of the long weld neck flange is same with the weld neck flange, so it could be raised face(RF), flat face(FF) or Ring Type Joint(RTJ) , the long weld neck flange is suitable to be used for the high pressure application. 

The long weld neck flange(integral flange) could be in many materials, carbon steel ,alloy steel or stainless steel .Hebei haihao group can supply the long weld neck flange(lwn flange) as per customers’ requirements.

BS EN10204 3.1 MTC, ABS, PED 97-23-EC, CE, ISO, API approved.