Category:Flange - Piping-Designer
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Category:Flange

Category:Flange

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FLG

A flange is a bolted connection where two pieces of pipe, equipment, fittings or valves can be connected togeather. They come in different styles, pressure ratings and sizes to meet the design requirements.


Contents

Blind Flange (BF)

These flanges do not have a bore. It is used to blind off a flange or even a valve. When used at the end of a pipe or fitting, it provides an easy to open access for further extension of the pipe. The blind flange and its bolts are stressed more than any other flange.

Blind flange

Lap Joint Flange (LJF)

This flange is used with a lap joint stub end fitting. It is similar to a slip-on flange, but with two differences. The radius and the flat face, both allow the flange to secure against the stub end fitting. This is useful where alignment of bolt holes is difficult, such as with spools to be attached to flanged nozzles of vessels. A lap joint is used in low pressure applications and not suitable where high external of heavy loads are present.

Lap joint flange

Slip-On Flange (SOF)

Slip-on flanges are designed to slip over the outside of pipe, long-tangent elbows, reducers, and swages. The flange has poor resistance to shock and vibration. It is easier to align than welding neck flange. This flange is ideal for low pressure applications since the strength when under internal pressure is about one third that of a weld neck flange.

Slip-on flange

Socket Flange (SF)

This is similar to a slip-on flange, except they have a bored and counter bore. The counter bore allows the pipe to fit into the socket/counter bore. The bore of the flange is the same diameter as the inside of the pipe. These flanges were first designed for small diameter, high pressure pipe.

Socket flange

Threaded Flange (THDF)

It is similar to a slip-on Flange, but has internal threads. It is normally used for low pressure and not used where temperature or stress is very high.

Threaded flange

Weld Neck Flange (WNF)

This flange comes in two types, regular and long. The hub of the weld neck is designed to reduce the stress at the base of the flange. Regular weld neck flanges are used with buttweld fittings and long weld neck flanges are usually used with equipment and vessel nozzles. A long weld neck flange is rarely used with pipe. Both types of flanges are bored to match the inside diameter of the pipe or fitting to which it will be welded to. They are suitable where high pressure, extreme temperatures, shear impact and vibratory stresses apply.

Weld neck flange




Orifice Flange

Orifice flanges are for metering the flow of liquids and gasses through a pipe. Two orifice flanges are called a orifice flange union. Each flange comes with two pipe taps for measuring the pressure drop of the flow through the Orifice Plate. Two jack screws are used to spread the flanges apart in order to change the orifice plate. Orifice plates do not come with the flanges. This flange is normally available in weld neck, slip-on, and threaded flanges.

Orifice flanges are installed in a straight run of pipe in order to avoid turbulence at the plate.

Orifice Flange Union
Orifice Flange Union
Pipe Taps
Pipe Taps
Pipe Taps
Pipe Taps
Jack Screw
Jack Screw

When installing the orifice plate holder the pressure taps need to be at the same elevation to eachother. The assumption when making the calculation for the orifice plate is that static head of the tubes is the same on both sides of the orifice plate. Pressure taps should not be installed facing down as the taps could become plugged with debris in the line.


Orifice flanges come in sizes ANSI 300 and up. This is because the thickness of ANSI 150 flanges are not enough to allow for drilling pressure taps.

Slip-On Orifice Flange

Image:Datasheet ORFSOCF.jpg


  • ANSI Orifice Socket Flange Datasheets:

Threaded Orifice Flange

Image:Datasheet ORFTHDF.jpg


  • ANSI Orifice Threaded Flange Datasheets:

Weld Neck Orifice Flange

Weld neck flange




Standard Connection - LWNF, HBF, FBF

This flange is normally used for nozzles on pressure vessels and rarely used with pipe. The hub of the flange is straight and thicker than the taper of the weld neck flange (WNF).

Long Weld Neck Flange (LWNF)

Long weld neck flange

Heavy Barrel Flange (HBF)

Image:Datasheet HBF.jpg

Full Barrel Flange (FBF)

Image:Datasheet FBF.jpg




Ring Type Joint Flange (RTJF)

These are used for a leak-proof connection in high pressure applications and come in blind, slip-on, threaded and weld neck. The flange has a hexagonal groove sealing surface and is fitted with a ring that is compressed in a groove.

Blind RTJF

Ring type joint flange

Slip-On RTJF

Ring type joint flange

Threaded RTJF

Ring type joint flange

Weld Neck RTJF

Ring type joint flange




Reducing Flange

Reducing flanges are designed for when there is a change in the pipe size. The predominate flange (dimensions) matching the larger pipe size (NPT) but having a smaller bore matching the smaller pipe size (NPT). These flanges normally come in blind, slip-on, threaded and weld neck flanges. They are available in all pressure classes and provide a good alternative to connecting two different sizes of pipe.




Studding Outlet

This flange is designed to be installation in the inside or outside of vessels and tanks. The curving of the outlet should be ordered to fit the curvature of the shell, head or cone. These flanges can be ordered with test holes (normally with a 1/8" tap unless specified). All classes 150 thru 2500 have a 1/16" raised face.

Flat Bottom
Flat Bottom
Shell/Head Mount
Shell/Head Mount
Tangential Mount
Tangential Mount

Flange Companies

Also See

Subcategories

This category has the following 12 subcategories, out of 12 total.

E

F

F cont.

G

H

S

V
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