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What is a flange data table?

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Quick Answer

A flange data table is a reference that contains information about various characteristics of different industry standard pipe flanges. Flange data tables feature information such as a flange's class, inner and outer diameters, and the number of bolts it requires for mounting.

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Full Answer

Flange data tables are necessary because, unlike many other plumbing components, different standard flanges cannot be used together, even if the flanges are exactly the same size. Furthermore, even otherwise identical standard flanges with equal pressure classes are not interchangeable between different national and international standardization organizations. For example, an Australian AS 2129 Table F flange cannot safely mate with an international ISO 7500 PN25 flange, as these flanges have very slightly different bolt requirements despite being the same in every other way.

Flange standards are broken down into different classes. A flange's class indicates the usual operating pressure for which that flange is designed. Standard flanges are also differentiated based on whether they have a raised inner face or not. Flat flanges are easy to identify on a flange data table, as they lack any data entry for raised face diameter.

An important piece of information on a flange data table is the number and size of mounting holes the flange features. Flange data tables also specify exactly which standard bolt size technicians should use when installing different standard flanges.

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