Long Weld Neck Flange Manufacturers In India – Astm A182 F11 Grade Flanges With High Strength, Smooth Bore Transition And Durability

Name: Long Weld Neck Flange Manufacturers In India – Astm A182 F11 Grade Flanges With High Strength, Smooth Bore Transition And Durability
Brand: Viha Steel & Forging
Availability: InStock
Rating: 4 (1 reviews)

Specification Details
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.

Key Features & Benefits

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

Quality Assurance & Inspection

The inspection of each Long Weld Neck Flange is strictly directed to the adherence to the project requirements and world standards. Testing includes:

Chemical and mechanical analysis.
Ultrasonic testing and radiographic testing.
Dimensional inspection

Long Weld Neck Flange – Client Project Report

Our Long Weld Neck Flanges are widely supplied for critical piping systems requiring high strength, precise alignment, and long-term reliability. With proven performance in high-pressure and high-temperature applications, we have successfully executed multiple refinery, power, and process industry projects across India. The following table highlights some of our key domestic supplies with quantities and project locations.

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

Positive Material Identification (PMI).Long Weld Neck Flanges are suitable in a harsh service environment because they have high fatigue strength and structural integrity and are useful in the global sourcing and B2B business environment. One of the sub-products is the flanges that have a raised sealing surface that offers better gasket compression and leak-free high-pressure, high-temperature joints. It is the best variant that suits critical pipelines that have to be of long service life, high safety, and proper performance.