Hub flange (also known as weld neck flange) are majorly used for applications where high pressure is a factor. These are generally available with a flat face, raised face or RTJ facing. One noteworthy thing here is that the production of these flanges is expensive because of the long necks present in their design. Their installation process is also a bit complex compared to other flanges, with their inside diameter being machined to match the inside diameter of the tube for reducing friction and obstruction of flow. Hub flanges are generally used only in those industries where the margin for error is minimal.
Hub flanges can be manufactured from many different types of materials such as copper, stainless steel, cast iron, galvanized steel and many more. Like all flanges these are also available in different dimensions, with the scope of customization also available.
Advantages of Hub Flange
Although expensive, these flanges do accord some advantages as compared to other flanges :
These are optimally suitable for high heat applications.
These ensure reduced interference with the flow of the fluid . Due to their neck, more accurate alignment is possible. Furthermore, this alignment is also much more precise with less tolerance.
Since these flanges allow for easier access, tests such as radiography are much easier to perform.
These provide for a leakage proof connection.
Features of Hub Flange
These are resistant to corrosion and abrasion.
Also resistant to chips, winding and moisture.
The flanges work flawlessly in all weather conditions.
Hub flanges require minimal maintenance and have a long functional life.
Optimal tolerance to impacts and shocks.
Some Facts About Hub Flanges
These flanges are almost always butt welded to pipes.
Hub flanges have been used successfully at pressures up to 5000 psi.
These are generally machined from a forging.
Hub flanges typically comprise of a circular fitting with a protruding rim around the circumference.
These are basically available in two types, the regular type used with pipes and the long type that is ideal for use in process plants.
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