How to Select Right Flanges for Your Project


It is crucial to choose the right flange for the application. The flange must fit perfectly into the pipe joints if it wants to function. If you make one slight mistake while selecting the flange, it may affect the application and result in a costly error. You can address the considerations for choosing the right flange that goes well with the applications for optimum usability.

Flange Size

The flange size consists of several variables. These include the right pressure class, standards used, and right flange measurement. The inner diameter, outer diameter, number of bolt holes, the diameter of the bolt holes, and the bolt circle are influences. Flanges are available in many sizes ranging from 48″ (1200NB) to 1/2″ (15NB).

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Flange Thickness

Define a flange by how it handles the high pressure. Apart from this, thickness plays a crucial role as thicker flanges can better handle higher pressures in an application.

Bolt Holes

The pressure class and size of the flange help to determine this component. The actual size, pitch circle diameter, and the number of bolt holes on the flanges are the three variables that need consideration. The stronger and heavier bolt results in higher pressure that withstands the flange. The pattern must match up to the item the flange is bolting to.

Flange Standards

You can find a range of criteria that make choosing the flange standard tough. It is most likely that the choice is based on the standards and application of other components to which the flanges are linked. The three major standards used are JIS (Japanese International Standard), DIN (Deutsches Institut für Normung / European), and ANSI (American National Standards Institute).

Pressure Class

The pressure class is the nominal pressure quality the product can safely work under or support. There are many pressure groups available for each standard, and it ranges from high-pressure tolerance to low-pressure tolerance. The pressure class of the items that operate together must be the same as the pressure class of the valves and pipes in the system to the ones they are connected. The pressure class of carbon and stainless steel flanges ranges from 2500#, 900#, 600#, 400#, 300#, 150#, and so on.

Flange Materials

It is crucial to select the right material for a flange. It is essential to know the elements it will face in an application that uses the piping method. Common materials include copper, nickel, carbon steel, stainless steel, and steel. The supporting materials of these flanges, such as stainless Steel 317 flanges, are flange bolts, ring joining, and gaskets.



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