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What are the Various Factors to Identify Suitable Flanges for Your Work?

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


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).

Flange Types

If you identify the flange type by its appearance, it is usually easy. Decide whether the flange has a socket weld, solder collar neck, lap joint, threaded bore, or flat face and that defines the basics.

You can start by choosing if it has a flat face that is completely raised or a flat face that is a slightly raised portion on the flange face with marked bottoms. There are many different types of flanges as indicated previously, in various material grades of carbon and stainless steel.

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 helps 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 in criteria that makes it tough to choose the flange standard. 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 that 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. You must know the elements it will face in an application that uses the piping method is essential. 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.

Other factors for selecting flanges

Consider the tolerances, flange dimensions, temperature and pressure ratings, and pipe materials to determine the appropriate flange material. ANSI ratings help to provide information on heat and pressure tolerances. The fitting type is one of the crucial things to consider. The material you choose must allow welding. For non-welded styles like lap joints or threaded flanges, weldability is not a major concern, and other requirements will take precedence.


Choosing the ideal flange for work refers to the standards required for your intended application. You must consider the pipe material that can connect to the flange and ensure that the flange material you choose is rated for the pressure and temperature it must withstand.

At Texas Flange, we offer all types of flanges for various systems. Our specialists can help you to identify the right flange for your equipment. If you want more information, contact us today!

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