Classification of Flanges
Classification of Flanges
Classification of Flanges
1. Standard flange
2. Nonstandard flange
3. Wide face flange
4. Narrow face flange
1.Standard flange
Standard flanges are
designed as per I.S. standard and are available
readily for the
pipe joints, connections between head and shell etc. These can be used for moderate
pressure and
temperature.
2. Nonstandard flange
Nonstandard flanges are formed from structural
section or plate.
These are designed
with specific material, shape, size, bolting arrangement etc. as per the
requirement
of the process
equipment. Specific design procedure needs to be followed in this case.
3. Wide face flange
If the gasket is applied all over the width of
the flange, it is called as wide
face flange. These
are suitable for low pressure operations and temperature limited up to 200 C
Since the gasket is
applied all over the flange face, bolt load required for tightening the joint
is very
high and more of
bolts are required. This can become costly.
4. Narrow face flange
If the gasket is applied only over some part of the flange, specifically
not beyond the bolt hole, is called a narrow face flange. Narrow face flanges can be Classification as:
(A) Raised face flange
In raised face flange some
portion of the flange face is raised and is finished with grooves or
spirals so that the
gasket can remain in position. A flat ring gasket of soft material, slightly
less in
width than that of
the width of raised face is used.
(B) Male and female face flange
In male and female facing
one flange has a recessed face while the other flange has a
corresponding
raised face. The flange face is smooth.
(C) Tongue and groove face flange
In tongue and groove facing one flange is provided with a groove while the other flange is
provided with a raised ring called as tongue. Tongue and groove construction needs a narrow flat
gasket.
(D) Ring face flange
Ring flange face is formed
by identical grooves on both the flanges. The grooves are trapezoidal
in shape. A ring
gasket fits in the grooves and is well protected.
Photo Credit:- nitechstainlessc
