Long Weld Neck Flange
Minimum Order : 100 piece
Customization as per requirements
Long Weld Neck Flange – Specification
| Flanges Types | Slip On, Weld Neck, Long Weld Neck, Threaded, Blind, Companion, Lap Joint |
|---|---|
| Class | Asa 300, 2500 Lbs Asa 150, 900 Lbs, 600 Lbs, 300 Lbs, 150 Lbs, 160, 1500 Lbs, Pn 6, 10, 16, 25, 40, 100, 64 |
| Size | 1/2″ (15 Nb), 48″ (1200nb) Dn10~dn5000 |
| Type | Raised Face (rf), Small Tongue, Groove, Flat Face (ff), Ring Type Joint (rtj), Large Male Female (lmf), Lap Joint Face (ljf), Small Male Female (smf), Large Tongue & Groove |
Long Weld Neck Flange
Type of Sub-products

Standard Long Weld Neck Flange Standard Long Weld Neck Flange
The most common style, featuring a straight, extended neck that gradually tapers to the pipe wall. Ideal for pressure vessels, heat exchangers, and nozzles where stress distribution and smooth flow transition are critical.

Heavy Barrel Long Weld Neck Flange Heavy Barrel Long Weld Neck Flange
Built with a thicker, reinforced neck wall for very high pressure or heavy mechanical loads. Frequently used on reactor vessels, tall distillation columns, and high stress piping systems.

Tapered Neck Long Weld Flange Tapered Neck Long Weld Flange
Features a gradually tapered neck for optimal stress transfer in high temperature and cyclic loading applications such as steam drums and superheaters.
Frequently Asked Questions
Where are Long Weld Neck Flanges typically used?
They are commonly used in petrochemical plants, oil refineries, offshore drilling platforms, high pressure steam lines, and power generation facilities. The elongated neck makes them perfect for vessels, columns, and reactor nozzles, where reduced vibration and uniform stress are critical. Industries select LWN flanges for reliable sealing in high pressure, high temperature, or corrosive environments.
What materials are commonly used in Long Weld Neck Flange ?
Manufacturers typically use ASTM A105/A350 carbon steel for general service, ASTM A182 F304/F316 stainless steel for corrosive media, and low alloy or exotic grades such as F11, F22, Duplex, Super Duplex, Inconel, and Hastelloy for high temperature or chemically aggressive applications. Material choice is driven by process conditions, pressure ratings, and corrosion resistance requirements.
What are Heavy Barrel Long Weld Neck Flanges?
A Heavy Barrel LWN Flange is a reinforced version with a thicker, more robust neck engineered for very high pressure or high stress applications, such as hydrocracker reactors, tall distillation columns, or heavy duty vessels. The added neck wall thickness increases fatigue life and supports greater mechanical loads.
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Countries We Export – Long Weld Neck Flange
- India
Cities We Supply – Long Weld Neck Flange
- Mumbai
- Lucknow
- Nashik
- Pune
- Rajkot
- Moradabad
- Angul
- Rudrapur
- Hosdurg
- Gandhinagar
- Rajahmundry
- Durgapur
- Bharuch
- Panipat
Industries We Serve – Long Weld Neck Flange
Sugar
Oil And Gas Industries
Paper Mill
Power Plant
Bridge And Building
Aerospace Industries
Automobile Industry
Electrical Industry
Defense Industry
Construction & Fabrications
Ring Man Units
Railways

Gasket Industry
Pharmaceuticals Industry
