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Pocket Guide to Flan..

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A B<br />

figure 1-7. Reducing and blind flanges. (Courtesy of Tube Turns Technologies, Inc.)<br />

The reducing flange is described in the same manner<br />

as a reducer--that is, the large end first, the reduction<br />

second. An example would be a 6-in. raised face by 2-in.<br />

threaded reducing flange, ANSI 150 Ib rating.<br />

Blind <strong>Flan</strong>ge<br />

Figure 1-7B shows a blind flange, which has no bore,<br />

and is used <strong>to</strong> close ends of piping systems. A blind<br />

flange also permits easy access <strong>to</strong> a line once it has<br />

been sealed.<br />

The blind flange is sometimes machined <strong>to</strong> accept a<br />

pipe of the nominal size <strong>to</strong> which the reduction is being<br />

made. The reduction can be either threaded or welded.<br />

Long Weldneck <strong>Flan</strong>ge<br />

Miscellaneous <strong>Flan</strong>ges<br />

This is a special flange used for nozzles on pressure<br />

vessels. The hub is always straight, and the hub thick-<br />

ness is greater than the diameter of any piping that may<br />

be bolted <strong>to</strong> the flange. See Figure 1-8.<br />

10

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