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Stainless Steel Long Welding Neck (LWN) Flanges
Stainless Steel Long Welding Neck (LWN) Flanges
Stainless Steel Long Welding Neck (LWN) Flanges
Stainless Steel Long Welding Neck (LWN) Flanges

Stainless Steel Long Welding Neck (LWN) Flanges

A long welding-neck (LWN) flange has a longer neck than a standard WN and is common on vessel and exchanger nozzles.

Specifications

Type
Long welding-neck flange (LWN)
Size
From drawing, up to about DN3000
Neck / bore
From drawing, not a standard WN neck
Material
304/304L, 316/316L, 310S, 321, 2205, 2507
Standard
Often B16.5 facing + drawing neck; the drawing governs
Connection
Long neck butt-welded to shell or pipe
Inspection & delivery
MTR available; hydrotest/NDT and lead time per order

Non-standard / OEM Customization Available

We support custom manufacturing based on your drawings and samples (NPS, Material, Thickness).

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A long welding-neck (LWN) flange has a longer neck than a standard WN and is common on vessel and exchanger nozzles. HuaboPipe supplies stainless LWN flanges to order. Neck length, bore and facing follow the drawing, up to about DN3000.

How to choose

Use LWN for vessel nozzles or when a long neck is needed for reinforcement or inspection. Do not extend a standard WN with extra pipe. Send neck length, bore and flange facing.

FAQ

LWN vs WN?

LWN neck length is from the drawing. WN uses the standard piping-flange neck.

Can you make it without neck length?

Not accurately. Send a drawing or neck length and bore.

Maximum size?

About DN3000, from the drawing.

Lead time?

Confirmed with the drawing. We reply within 24 hours.