Weld Neck Flange,Butt Weld Flange

Definition and details of weld neck flange

Weld neck flange (also known as a high-hub flange and tapered hub flange) is a type of flange. There are two designs. The regular type is used with pipes. The long type is unsuitable for pipes and is used in process plant.A weld neck flange consists of a circular fitting with a protruding rim around the circumference. Generally machined from a forging, these flanges are typically butt welded to a pipe. The rim has a series of drilled holes that permit the flange to be affixed to another flange with bolts.

ASTM A105 Weld Neck Flanges

Advantages of Weld Neck Flange

Such flanges are suitable for use in hostile environments that have extremes of temperature, pressure or other sources of stress.The resilience of this type of flange is achieved by sharing the environmental stress with the pipe with which it is welded.This type of flange has been used successfully at pressures up to 5,000 psi.

The welding neck flange derives its name from the neck portion of the flange that is welded to the end of a piping system. It is designed to transfer stress to the pipe, thereby reducing high stress concentrations at the base of the flange. Weldneck flanges are costlier due to their design and engineering, and increased material.

Uses of Weld Neck Flanges:

Weld neck flanges have a long tapered hub and are often used for high pressure applications. When ordering a weld neck flange, it is important to specify the schedule pipe is being used for. This is because the inside diameter of the flange will match the inside diameter of your pipe. The buttweld joint this flange has with the pipe along with the tapered hub, makes this flange very resistant to dishing and a very sturdy connection. These flanges are ideal for extreme fluctuations of temperature and in environments where there may be a lot of bending and handling of the flanges.

Weld Neck Flanges Size and Pressure

Size : 1/8″ NB TO 48″NB.

Class : 150#, 300#,400 #,600#,900#, 1500# & 2500 #.

Weld Neck Flanges Standard

Weld Neck Flange Materials:

Carbon Steel Weld Neck Flange:
A105 GradeⅠ Carbon Steel Weld Neck Flange
Alloy Steels Weld Neck Flange:
A182 Grade F1 Alloy Steel Weld Neck Flange
A182 Grade F5 Alloy Steel Weld Neck Flange
A182 Grade F7 Alloy Steel Weld Neck Flange
A182 Grade F9 Alloy Steel Weld Neck Flange
A182 Grade F11 Alloy Steel Weld Neck Flange
A182 Grade F12 Alloy Steel Weld Neck Flange
A182 Grade F22 Alloy Steels Weld Neck Flange
Low-Temperat Steel Weld Neck Flange:
A350 Grade LF1 Low-Temperat Steel Weld Neck Flange
A350 Grade LF3 Low-Temperat Steel Weld Neck Flange
A350 Grade LF4 Low-Temperat Steel Weld Neck Flange
A350 Grade LF6 Low-Temperat Steel Weld Neck Flange
A350 Grade LF8 Low-Temperat Steel Weld Neck Flange
Stainless Steel Weld Neck Flange:
A182 Grade F304 Stainless Steel Weld Neck Flange
A182 Grade F304H Stainless Steel Weld Neck Flange
A182 Grade F304L Stainless Steel Weld Neck Flange
A182 Grade F316 Stainless Steel Weld Neck Flange
A182 Grade F316H Stainless Steel Weld Neck Flange
A182 Grade F316L Stainless Steel Weld Neck Flange
A182 Grade F321 Stainless Steel Weld Neck Flange
A182 Grade F321H Stainless Steel Weld Neck Flange
A182 Grade F347 Stainless Steel Weld Neck Flange
A182 Grade F347H Stainless Steel Weld Neck Flange