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Long weld neck flange, or LWN, is considered a specialty flange because of its protruding neck, also referred to as a hub. The neck extends from the flat surface of the flange and receives and guides the pipe into place — the neck serves as an extension of the boring. Tapering the neck provides extra reinforcement for use in high-pressure or extreme and fluctuating temperature applications. Tapering the flange reduces the steel's thickness so that the opening of the neck blends with the pipe it receives — the tapered neck appears to be an extension of the pipe.

Long weld neck flanges are mainly used in petroleum and chemical industry, and more and more people like long weld neck flanges because of its easier installment. 

Specification:

Standard: ANSI B16.5

Size: 1/2"-24"

Class:150-2500

Material: ASTM A182 F304, F304L, F316, F316L, F321, F347

Manufacture method: forging

Type: long weld neck flange, stright hub welding flange

Length though hub: NPS≤4, L Max 229mm, NPS＞4, Length Max 304, others agreed by two parties

Other dimension are the same with weld neck flange

Certificate: MTC or 3.1 certificate

Origin: Jiangyin, China

Port of departure: Shanghai, China

Incoterm: FOB, CIF, CFR, EXW, DDP

Payment method: T/T, L/C, D/P

Contact:

Jenny

Email: flangesales@163.com

Skype: jenny83419

Web: www.guoshengflange.com