Factors Used to Identify Flanges

stainless steel flanges

It is necessary to pick the right flanges for the work for any flange or any product to perform properly. In order to perform its functions properly, the flange should fit perfectly into the pipe joints. A slight mistake in the selection of a flange may affect an application, resulting in a costly error. In order to ensure optimum usability, let us address the considerations that are all relevant to choosing the right flange for the right application.

Whether a flange would work properly everything goes back to whether the flange in the first place was the right one for the job. In order for a flange to work correctly, it must fit into pipe joints. A small mistake in choosing a flange can affect an application, resulting in an expensive error. In order to optimize its functionality, these 7 considerations are all involved in selecting the right flange for the right application.


Identifying the flange type by how it looks is pretty easy. Second, by deciding whether a flange has a flat face, threaded bore, lap joint, solder collar, socket weld, or tongue and groove, and define the tops. First, by deciding if it has a flat face that is completely flat or a raised face that is a slightly raised portion on the face of the flange, the bottoms are marked. There are many different types of flanges, namely, Stainless Steel 309 Flanges, Stainless Steel 317 Flanges, and Stainless Steel 317L Flanges.


The size of a flange consists of variables that include the standard used, the appropriate pressure class, and the actual flange measurements. The outer diameter, inner diameter, number of bolt holes, diameter of the bolt hole, and the bolt circle are influences. The Stainless Steel 309 flanges are available in various sizes ranging from 1/2″ (15 NB) to 48″ (1200NB).


 In defining a flange by how high a pressure it can handle, thickness plays a critical role since thicker flanges can handle higher pressures in an application.

Bolt Holes

 The size of a flange and pressure class helps to determine this component. The number of bolt holes, pitch circle diameter, and actual size of the bolt holes on a flange are 3 variables that need to be considered. The heavier the bolt, the stronger the bolt is, which results in a higher pressure that can withstand the flange.


 There are a range of criteria from which it is possible to choose. It is most likely that the choice will be based on the application and standards of the other components to which this flange will be linked. The three major standards used are: ANSI (American National Standards Institute), DIN (Deutsches Institut für Normung / European), and JIS (Japanese International Standard).

 Pressure Class

The pressure class is the nominal quantity of pressure that the product can safely support or work under. There are several pressure groups available for each standard, ranging from low pressure tolerance to high pressure tolerance. The pressure class of the items that operate together should be the same as the pressure class of the pipes and valves in the system to which they are connected. The pressure class of 317L Stainless Steel flanges ranges from 150#, 300#, 600#, 900#, 2500# and so on.


Choosing the right material for a flange and knowing the elements that it will face in an application that uses the piping method is critical. Common materials include steel, stainless steel, carbon steel, and copper nickel (corrosion, pressure, moisture, temperature). The supporting materials of these Stainless Steel 317 flanges are Gasket, Ring Joint, and Flanges Bolts.