Pipeline Flange
05.37
A pipe flange is
a disc, collar or ring that attaches to pipe with the purpose of
providing increased support for strength, blocking off a pipeline or
implementing the attachment of more items. They are usually welded or screwed
to the pipe end and are connected with bolts. A gasket is inserted between the
two mating flanges to provide a tighter seal. These flanges are either custom
with dimensions provided by the customer or they are manufactured according to
published specifications. Several organizations and associations have published
specifications that provide dimensional information as well as pressure
specifications at different temperatures. Our company manufactures custom
designs and stocks six basic types of these products. Although, these are the
six most common types, we are a custom manufacturer as well and are able to
create just about any type of flange necessary for your requirements. Please
click on one of the following pictures for a more detailed description of the
item you are interested in. Each page also has a video that provides a better
understanding of the installation process.
Slip-on pipe
flanges actually slide over the pipe. They are typically machined with an
inside diameter slightly larger than the outside diameter of the pipe. This
allows the flange to slide over the pipe but to still have a somewhat snug fit.
Slip-ons are secured to the pipe with a fillet weld at the top and the bottom
of the flange. These are further catagorized as a ring or a hub. Rings and hubs
are both considered slip on flanges because they both fit over the pipe.
Weld neck pipe
flanges are installed by welding the pipe to the neck of the flange. This
allows for the transfer of stress from the flange to the pipe itself. This also
reduces high stress concentration at the base of the hub. Weld necks are often
used for high pressure applications. The inside diameter of this attachment is
machined to match the inside diameter of the pipe.
Blind pipe
flanges are used to seal the end of a piping system or pressure vessel
openings to prevent flow. They are commonly used for pressure testing the flow
of liquid or gas through a pipe or vessel. They also allow easy access to the
pipe in the event that work must be done inside the line. Blind pipe
flanges are often used for high pressure applications.
Lap joint pipe
flanges fit over the pipe and are most commonly used with Stub End
Fittings. A pipe is typically welded to the Stub End and the Lap Joint is free
to rotate around the stub end. The benefit of this is that there will not be
any issues with bolt hole alignment. These are often used for applications that
require frequent dismantling.
Threaded pipe
flanges are similar to slip-ons except the bore of threaded pipe flange
has tapered threads. They are used with pipes that have external threads. The
benefit of these is that it can be attached without welding. Threaded pipe
flanges are often used for small diameter, high pressure requirements.
Socket-weld pipe
flanges are typically used on smaller sizes of high pressure pipes. These
flanges are attached by inserting the pipe into the socket end and applying
fillet weld around the top. This allows for a smooth bore and better flow of
the fluid or gas inside of the pipe.
Sumber:
(http://www.coastalflange.com/pipe-flanges.html)
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