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Weld Neck
This flange is
circumferentially welded into the system at
its neck which means that the integrity of
the butt welded area can be easily examined
by radiography. The bores of both pipe and
flange match, which reduces turbulence and
erosion inside the pipeline. The weld neck
is therefore favored in critical
applications
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Slip On
This flange is slipped
over the pipe and then fillet welded.
Slip-on flanges are easy to use in
fabricated applications. |
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Blind
This flange is used to
blank off pipelines, valves and pumps; it
can also be used as an inspection cover. It
is sometimes referred to as a blanking
flange
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Socket Weld
This flange is counter
bored to accept the pipe before being fillet
welded. The bore of the pipe and flange are
both the same therefore giving good flow
characteristics. |
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Threaded
This flange is
referred to as either threaded or screwed.
It is used to connect other threaded
components in low pressure, non-critical
applications. No welding is required.
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Lap Joint
These flanges are
always used with either a stub end or taft
which is butt welded to the pipe with the
flange loose behind it. This means the stub
end or taft always makes the face. The lap
joint is favored in low pressure
applications because it is easily assembled
and aligned. To reduce cost these flanges
can be supplied without a hub and/or in
treated, coated carbon steel.
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Ring Type Joint
This is a method of
ensuring leak proof flange connection at
high pressures. A metal ring is compressed
into a hexagonal groove on the face of the
flange to make the seal. This jointing
method can be employed on Weld Neck, Slip-on
and Blind Flanges. |
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