Long Weld Neck Flange

Key Features

Long Weld Neck Flanges are specially designed flanges featuring an extended tapered hub that provides additional reinforcement and improved stress distribution. These flanges are commonly used in high-pressure, high-temperature, and critical applications such as pressure vessels, column heads, and specialized piping systems.

SAKSHI FORGE manufactures premium quality Long Weld Neck Flanges using advanced forging techniques and high-grade stainless steel materials. The long neck of the flange helps in transferring stress from the flange to the pipe, thereby reducing stress concentration and increasing the overall strength of the piping system.

These flanges are bored to match the inside diameter of the pipe, ensuring smooth and uninterrupted flow of fluids. The extended hub design minimizes turbulence and erosion, making them suitable for applications involving high velocity fluids and extreme operating conditions.

Long Weld Neck Flanges are widely used in industries such as oil & gas, petrochemical, refineries, power plants, and offshore installations. They are particularly suitable for pressure vessels and equipment requiring nozzle connections.

All Long Weld Neck Flanges supplied by SAKSHI FORGE are manufactured in accordance with international standards and undergo strict quality inspection to ensure durability, reliability, and long service life.

Type

Long Weld Neck Flange

Standards

ASME B16.5, ASME B16.47, MSS SP44

Size

½” NB to 48” NB

Pressure Ratings

Class 150 to 2500

Face Type

RF, FF, RTJ

Manufacturing

Forged

Surface Treatment

Anti-rust Oil, Pickling, Passivation

Tolerances

As per ASME standards

Stainless Steel
ASTM A182 F304, F304L, F316, F316L, F321, F347, F904L

Duplex Steel
UNS S31803, S32205

Super Duplex Steel
UNS S32750, S32760

Nickel Alloys
Inconel 600, 625, Monel 400, Hastelloy C276

Size (NB)

OD (mm)

Bolt Circle (mm)

No. of Holes

Hub Length (mm)

Thickness (mm)

1”

108

79.4

4

120

14.3

2”

152

120.7

4

150

17.5

4”

229

190.5

8

200

23.9

6”

279

241.3

8

250

25.4

8”

343

298.5

8

300

28.6

10”

406

362

12

350

30.2

(Custom hub length and dimensions available on request)