Long WN Flange

QS Flange: Ningbo Long WN Flange

Long WN flange in forged stainless steel, 1/2 to 24 inch and 300LB with RF face, for piping that runs hot and under pressure.

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One-Minute Overview

Long weld neck flange forged from stainless steel for 1/2 to 24 inch lines.
Class 300LB with a raised face and the stiffness a long neck brings.
Good sealing under high temperature and high pressure loads.
Sized for oil and gas, chemical, petrochemical and power generation piping.

The long WN flange is the long-neck member of the weld neck family: the extended hub adds stiffness where the flange meets the pipe, which pays off on hot, high pressure runs. This series is forged from stainless steel and rated Class 300LB, with a raised face for a dependable gasket seal. Sizes run from 1/2 to 24 inch, so one family covers everything from instrument takeoffs to main headers.

Name: Long WN Flange
Size: 1/2"-24"
Pressure: 300LB
Material: Stainless Steel
Flange Face: RF
Process: Forged
Standard: ASME B16.5

Long weld neck flanges turn up where the joint sees real stress: pump and compressor connections, steam and thermal oil lines, refinery and chemical transfer, power plant headers. The longer hub spreads bending and thermal loads over more pipe, and the forged body keeps the grain flow tight for fatigue resistance. Pick 300LB when Class 150 falls short, and pair the raised face with the gasket the service requires. Butt weld the neck to the pipe, fit the stud set for the class, and tighten in a cross pattern to gasket guidance so the raised seat loads evenly.

FAQ

Q1. What makes the long WN flange different from a regular weld neck?

The neck itself. The extended hub adds stiffness where flange meets pipe, so bending and thermal loads spread further along the line instead of piling up at the joint. Everything else follows the same weld neck logic: butt weld it, bolt it to its class, and it stays tight.

Q2. Which sizes and pressure class does this series cover?

Sizes run from 1/2 to 24 inch across the series, all rated Class 300LB with a raised face. The bodies are forged stainless steel, and the flanges are dimensioned to ASME B16.5 so they interchange with standard 300LB mating flanges in piping systems.

Q3. Is this the flange for a line that behaves badly?

If your line runs hot, surges, or argues with its supports, yes. The long neck takes the abuse so the gasket does not have to. Weld it in, torque it by the book, and you can spend your worry budget on more interesting problems.

Q4. How long will production take?

Standard sizes are typically ready within 30 days, and in-stock items ship immediately. Larger or custom orders get a confirmed date per order, because the schedule depends on quantity, material, the bolt pattern you specify, and how busy production is at the moment you order.

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