LWN Flange

Designed for high-pressure and high-temperature applications, LWN flanges feature an extended tapered neck to reduce stress concentration and ensure leak-proof connections. Crafted from stainless steel, duplex, or alloy materials (ASME B16.5/EN 1092-1 compliant), they excel in critical industries like oil & gas, petrochemical, and power generation. With superior fatigue resistance and full penetration weld compatibility, our LWN flanges guarantee 20+ years of reliable service. Custom bore sizes, RTJ/grooved faces, and NACE MR0175 certifications available.

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Long Weld Neck Flange

Long Weld Neck Flange (LWN) is an extended form of butt welded flange with a neck, whose neck height is significantly higher than that of ordinary butt welded flanges. The neck is usually designed in a straight cylindrical shape, and the height is adjusted according to the nominal diameter (DN): when DN ≤ 100, the neck height is 229mm, and when DN>100, it is 305mm. The thickness of the neck wall gradually transitions to the thickness of the pipe wall, effectively improving the stress distribution, enhancing the rigidity and bearing capacity of the flange, making it suitable for working conditions with high pressure, high temperature and frequent temperature changes.

SIZE:

DN10(3/8")	DN15(1/2")	DN20(3/4")	DN25(1")	DN40(1-1/2")
DN50(2")	DN80(3")	DN100(4")	DN125(5")	DN150(6")
DN200(8")	DN250(10")	DN300(12")	DN350(14")	DN400(16")
DN450(18")	DN500(20")	DN550(22")	DN600(24")