ANSI Reducing Flange Dimensions

ANSI reducing flange dimensions ranges from 1/8″ NB to 48″NB. They are available in different specifications including 2500 #, 1500#, 900#, 600#, 300# and many others.


These objects are also available in different types and pressures. Their main purpose is pipe to pipe joining. These objects have a specific diameter. Apart from the hub and bore specifications, this type of flange has a bigger pipe size. To increase the size, the flange is applied at the expansion joint’s outer side. It is the most practical technique for size transitions.

Materials and Types

These flanges are designed to be durable and work under pressure. They have a fine finish, corrosion resistance and noted for their high strength. These devices are made from different materials. PVC, aluminum and bronze are used widely. Cast iron, brass, alloy steel and stainless steel are also used for manufacturing flanges. Three types are available: threaded, slip-on and welding neck.


ANSI reducing flange dimensions have a direct effect on their size. One of their main benefits is being simpler to bolt compared to flanges which are non-reducing. Their main purpose is to hook up flanges of different sizes. Fixing of flanges is done via welding, clamping or gluing of equivalent dimensions. These devices are very popular because mating is cheap and simple.

Pressure Classes

Pressure class or rating is set in pounds. Various names are used for pressure class designation. Class 150, 150# and 150 lbs point to the same thing. Flanges of forged steel are assigned 7 primary ratings: 150 lbs – 300 lbs – 400 lbs – 600 lbs – 900 lbs – 1500 lbs and 2500 lbs. Higher classes are capable of dealing with more pressure.

Class 300 is superior because they are built with more metal. This makes them more resistant to pressure. There are several factors that can influence a flange’s capability however.

Information About Flange Faces

Various types of faces are utilized for gasket sealing. ASME B16.5 and B16.47 provide the specifications for these facings. Some of the most common faces are large male and female facings, the raised face and small and large tongue-and-groove facings. Raised faces are the most commonly used. They are also the easiest to identify thanks to their appearance.

ANSI reducing flange dimensions and types have to be considered thoroughly before it is used. The pressure class specifications must also be assessed before they can be used with pipes.

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