Flanges are frequently used to connect sections of a plumbing system. Flanges, like any other type of plumbing, require a way to join the many components that make up a pipeline, such as the pipes themselves, valves, pumps, and filters, to name a few. Flanges are protruding ridge or rim that is designed to improve an element’s strength or distribute the weight applied to it. When choosing the ideal flange for your unique applications, you must consider several crucial factors in addition to the kind. The size, pressure class, and material are all factors to consider.
How to Select the Right Flanges?
Selecting the Size
The API 6A Flanges must be used to determine the flange size. These specifications specify the flange size for the pipe diameter that will be attached to the flange. Tolerances, as well as standards and suggestions for flange bolting and flange gaskets, are frequently included.
Selecting Material
The standard guideline is to use a flange made of the same material or a compatible alloy as the pipes and fittings that will be attached to the flange. Titanium flanges or zirconium flanges, for example, are the ideal choice for titanium piping.
The notion is that the materials’ chemical composition prevents unwanted reactions, especially when in contact with process fluids. Materials specifications and requirements are governed by ASTM standards. ASTM standards assign a grade to material for easy identification and list the chemical composition in percentages. Flanges are commonly specified by ASTM A105, A182, and A350. The ASTM standard for titanium flanges includes requirements such as B363 and B381.
Pressure Class
The pressure class refers to the flange’s pressure and temperature capability. Other terms used interchangeably with “pressure rating,” “class,” “#,” “Lb,” or “Lbs” are “pressure rating,” “class,” “#,” “Lb,” or “Lbs.” ANSI/ASME standards apply as well, with seven flange pressure classes defined by ANSI/ASME B16.5: 150, 300, 400, 600, 900, 1500, and 2500.
These parameters are also closely linked to size. While two flanges may have the same bore size and material, a higher class means the flange is larger, heavier, and more durable, allowing it to endure higher temperatures and pressures, depending on the material.
