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Special Flanges
On this page are the special flanges discussed, and parts that may include a flange connection. Special Flanges are basically identical to standard flanges, but have a number of special features.
Orifice Flange
Orifice Flanges are intended for use instead of standard pipe flanges when an orifice plate or flow nozzle must be installed. Pairs of pressure "Tappings", mostly on 2 sides, directly opposite each other, are machined into the orifice flange. This makes separate orifice carriers or tappings in the pipe wall unnecessary.
On the image above a set Orifice Flanges is shown, where the tappings are sealed with a plug, and where a jack screw is machined. This jack screw is used to facilitate separating the flanges for inspection or replacement of the "Orifice Plate".
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Long Weld Neck Flange
Long Weld Neck Raised Face (LWNRF) flanges are similar to a standard Welding Neck flange, but the "Neck" is considerably longer. This type is often used as a nozzle for a barrel or column. In addition, there are the type LWN Heavy Barrel (HB) and the Equal LWN Barrel (E); they have a different shape and a thicker "Wall".
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Weldoflange/Nipoflange
The Weldoflange and Nipoflange is a combination of a Welding Neck flange and a supposedly Weldolet or Nippolet. The 2 components are manufactured in one piece, and not welded. These flanges are primarily in Branch connections. |
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Expander Flange
Expander Flanges is a Welding Neck pipe flange where the nominal size of the non-flanged end is larger than the nominal size of the flanged end. They can be used to change the size of a pipe run. These are usually used to increase the line size to the first or second larger size. This is an alternative to using a separate reducer and weld neck flange combination. The expander flange can be used to connect pipe to pumps, compressors and valves. |
Reducing Flange
Reducing Flanges are suitable for changing line size, but should not be used if abrupt transition would create undesirable turbulence, as at pump connections. a reducing flange consists of a flange with one specified diameter having a bore of a different and smaller, diameter. Except for the bore and hub dimensions, the flange will have dimensions of the larger pipe size. |
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Ring joint Flange
Ring joint flange is a special type of flange connection in which a metal ring (resting in a groove in the flange) serves as a pressure seal between the two flanges. RTJ flanges seal when tightened bolts compress the gasket between the flanges into the grooves, deforming (or "Coining") the gasket to make Intimate Contact inside the grooves, creating a metal to metal seal. |
Plate Flange
Plate flanges are a widely accepted and cost effective alternative to forged or cast flanges in low pressure applications. Over the years, a number of standards have been applied to the production of stainless steel plate flanges.
Our plate flange product line includes standard and specialty flanges from 31/2" to 120" in diameter produced to all applicable standards.
This flange can be applied to Petro-chemical project, pipe engineering, public appliances, etc. |
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