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Pocket Guide to Flan..

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1<br />

ANSI<br />

FLANGES<br />

A flange is used <strong>to</strong> join pipe, valves, or a vessel within<br />

a system. The common ANSI flanges are shown in Fig-<br />

ure 1-1, and special flanges are illustrated and defined<br />

later in this chapter.<br />

ANSI Standards<br />

Pressure ratings for flanges are designed <strong>to</strong> ANSI<br />

standards of 150 Ib, 300 Ib, 400 Ib, 600 Ib, 900 Ib, 1500<br />

Ib, and 2500 lb. The most common terminology used is<br />

the pound reference, although the more formal reference<br />

is by class, such as Class 150 flange.<br />

The ANSI standards require that each flange be<br />

stamped with identifying markings as shown in Figure<br />

1-2. The markings include:<br />

1. Manufacturer's trade name.<br />

2. Nominal pipe size--the outside diameter of pipe<br />

the flange will match when welded <strong>to</strong> the pipe.<br />

1

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