Long Weld Neck Flange Manufacturers In India – Astm A182 F11 Grade Flanges With High Strength, Smooth Bore Transition And Durability
| Flanges Types | Slip On, Weld Neck, Long Weld Neck, Threaded, Blind, Companion, Lap Joint |
|---|---|
| Class | 150 Lbs, 300 Lbs, 600 Lbs, 900 Lbs, 1500 Lbs, 2500 Lbs Asa 150, Asa 300, Pn 6, 10, 16, 25, 40, 64, 100, 160 |
| Size | 1/2″ (15 Nb), 48″ (1200nb) Dn10~dn5000 |
| Type | Raised Face (rf), Flat Face (ff), Ring Type Joint (rtj), Lap Joint Face (ljf), Large Male Female (lmf), Small Male Female (smf), Large Tongue & Groove, Small Tongue, Groove |
Long Weld Neck Flange Manufacturers in India – ASTM A182 F22 Grade Flanges Offering Excellent Pressure Handling, High Strength, Corrosion Resistance and Reliability
Viha Steel & Forging is a trusted Long Weld Neck Flange Manufacturer, and it provides great performance. Long Weld Neck Flanges are designed to meet critical piping systems where leak prevention, stress distribution, and strength are required. These flanges are provided to have a long neck, which offers a smooth transition between the flange and the pipe, which minimizes turbulence and stress concentration. They are manufactured in high-quality carbon steel, stainless steel, and alloy steel and meet the international standard, and find wide application in oil and gas, petrochemical, power generation, and high-pressure industrial applications.
- Long tapered hub minimizes focus on stress.
- Very good fatigue and thermal cycling.
- Fits in high pressure and high temperature services.
- Offers a low turbulence and transition flow.
- Better connection with piping systems.
- Good mechanical strength and life.
- Applicable in severe and 24-hour service.
- Produced at a narrow dimensional tolerance.
- In numerous materials and pressure classes.
- Bores and custom neck lengths are available.
Technical Aspects
Long Weld Neck Flanges have been created to butt-weld directly to the pipe forming a strong and permanent joint. The long hub is also a structural extension of the pipe that has the effect of evenly distributing the stress throughout the joint and reducing the chances of failure.
These types of flanges are especially suitable in the systems that are subjected to high vibration, high pressure surges, and thermal expansion. Their construction also enables them to sustain accurate bore orientation, which is imperative in keeping the flow efficiency and erosion reduction in high velocity applications.
Reactors, heat exchangers, columns, and critical process lines commonly have Long Weld Neck Flanges.
Long Weld Neck Flange – Technical Specification Table
| Parameter | Specification | Available Options | Standards / Remarks |
|---|---|---|---|
| Product Type | Long Weld Neck Flange | LWN Flange | Custom design |
| Size Range | ½” NB to 48” NB | Larger sizes on request | ASME B16.5 / B16.47 |
| Pressure Class | Class 150 | 300 / 600 / 900 / 1500 / 2500 | ASME |
| Material Grades | Carbon Steel | ASTM A105 / LF2 | NACE on request |
| Stainless Steel | ASTM A182 F304 / F316 | — | |
| Alloy Steel | ASTM A182 F11 / F22 / F91 | High-temp | |
| Facing Type | Raised Face (RF) | RTJ / Custom | As specified |
| Neck Length | Standard / Extended | Custom length | Project specific |
| Bore | Standard / Custom Bore | Schedule based | Pipe matching |
| Manufacturing Process | Forged | CNC Machined | Precision finish |
| Welding Type | Butt Weld | Full Penetration | High integrity |
| Operating Temperature | -196°C to 700°C | Material dependent | Critical service |
| Testing | PMI, UT, RT | Hydro Test | As per code |
| Certification | EN 10204 | 3.1 / 3.2 | Full traceability |
| Packaging | Wooden Case | Export Packing | Seaworthy |
- Chemical and mechanical analysis.
- Ultrasonic testing and radiographic testing.
- Dimensional inspection
Long Weld Neck Flange – Client Project Report
| Product Supplied | Quantity Supplied | Cities |
|---|---|---|
| Carbon Steel Long Weld Neck Flanges for Refinery | 3,202 | Jamnagar |
| Stainless Steel LWN Flanges for Chemical Plant | 2,111 | Vadodara |
| Alloy Steel Long Weld Neck Flanges for Power Plant | 1,853 | Chennai |
| Long Weld Neck Flanges – Class 600 & 900 | 2,708 | Mumbai |
| Duplex Steel LWN Flanges for Offshore Project | 1,422 | Kochi |
| Custom Long Weld Neck Flanges for EPC Project | 999 | Pune |
| High-Pressure LWN Flanges for Process Industry | 1,220 | Hyderabad |
Type of Sub-products
Alloy Steel Long Weld Neck Flange Alloy Steel Long Weld Neck Flange
Alloy Steel Long Weld Neck Flanges are manufactured using alloy materials that provide superior strength, corrosion resistance, and temperature tolerance. The long neck design supports heavy loads and minimizes vibration in demanding environments. These flanges are commonly used in chemical processing, thermal power plants, and high stress piping systems.
Stainless Steel Long Weld Neck Flange Stainless Steel Long Weld Neck Flange
Stainless Steel Long Weld Neck Flanges offer excellent resistance to corrosion, oxidation, and chemical attack. The long tapered hub allows smooth fluid flow and reduces turbulence within the pipeline. These flanges are ideal for applications requiring hygiene, durability, and clean flow paths. They are widely used in food processing, pharmaceuticals, marine, and chemical industries.