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Long Weld Neck Flange

Extended Hub Nozzle Flanges | Custom Dimensions | For Pressure Vessels

Long-neck weld neck flange is a special type of flange designed specifically for equipment such as pressure vessels, towers, and storage tanks.

Long Weld Neck Flange is suitable for industries with extremely high requirements for pipeline systems, such as oil, chemical, and natural gas, and can withstand harsh environments with high temperature and high pressure..

Core Advantages of Pengrun Long Weld Neck Flange

Stronger structural integrity

Custom long weld neck flange dimensions

Eliminates extra welds for pressure vessels

Better stress distribution

Multiple material choices

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    Structural diagram

    Long Weld Neck vs Standard Weld Neck

    Long Weld Neck FlangeStandard Weld Neck Flange
    Straight extended hubTapered short hub
    For pressure vessel nozzlesFor pipeline connections
    Custom length & thicknessStandard fixed dimensions
    Square cut endBeveled end for pipe welding

    Applications of Long Weld Neck Flanges

    PRESSURE VESSELS

    Nozzle connections for pressure tanks & reactors

    BOILER SYSTEMS

    Boiler tube bundle & header connections

    HEAT EXCHANGERS

    Tube sheet & shell nozzle flanges

    STORAGE TANKS

    Reinforced inlet & outlet nozzle connections

    PETROCHEMICAL TOWERS

    Column & tower equipment nozzle flanges

    THERMAL POWER UNITS

    High-temperature vessel interface connections

    FAQs

    What is the core difference between long weld neck flange and standard WN flange?

    This nozzle flange adopts an integrated extended straight hub, used exclusively for boiler & pressure vessel nozzles. It removes extra welded spools, cutting leak points entirely.

    Can you customize non-standard long neck welded flange sizes?

    Of course. As an experienced manufacturer of long neck welded flanges, we can fully customize the hub length, wall thickness, and inner diameter according to your marine engineering drawings.

    Why is LWN flange more suitable for pressure vessel nozzles?

    The elongated hub disperses surface stress on tank walls effectively, resisting cyclic pressure impact, which standard short-hub weld neck flanges cannot achieve.

    What material options do you offer for long weld neck flanges?

    We can provide materials such as carbon steel, stainless steel, duplex stainless steel, and special steel..

    What inspection certificates can you provide for vessel projects?

    We support full NDT testing (UT/RT) and deliver official MTC material test reports to meet pressure vessel industry acceptance standards.

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