A weld neck flange (also known as a high-hub flange
and tapered hub flange
) is a type of
flange
A flange is a protruded ridge, lip or rim (wheel), rim, either external or internal, that serves to increase shear strength, strength (as the flange of an iron beam (structure), beam such as an I-beam or a T-beam); for easy attachment/transfer of ...
. 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
Forging is a manufacturing process involving the shaping of metal using localized compressive forces. The blows are delivered with a hammer (often a power hammer) or a die. Forging is often classified according to the temperature at which i ...
, 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.
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
Psi, PSI or Ψ may refer to:
Alphabetic letters
* Psi (Greek) (Ψ, ψ), the 23rd letter of the Greek alphabet
* Psi (Cyrillic) (Ѱ, ѱ), letter of the early Cyrillic alphabet, adopted from Greek
Arts and entertainment
* "Psi" as an abbreviatio ...
.
References
Piping
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