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Pocket Guide to Flan..

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

Types of ANSI <strong>Flan</strong>ges<br />

This flange, shown in Figures 1-1 and 1-2, is normally<br />

used for high-pressure, cold or hot temperatures.<br />

Slip-on and Lap Joint <strong>Flan</strong>ges<br />

Figure 1-4 shows these "twin" flanges. Note, however,<br />

that a slip-on flange is bored slightly larger than the OD<br />

of the matching pipe. The pipe slips in<strong>to</strong> the flange prior<br />

<strong>to</strong> welding both inside and outside <strong>to</strong> prevent leaks.<br />

The lap joint flange has a curved radius at the bore<br />

and face <strong>to</strong> accommodate a lap joint stub end. (Stub<br />

ends are described in Chapter 2.) The lap joint flange<br />

and stub end assembly are normally used in systems re-<br />

quiring frequent dismantling for inspection.<br />

Threaded <strong>Flan</strong>ge<br />

This type of flange, shown in Figure 1-5, is used in sys-<br />

tems not involving temperature or stresses of any magni-<br />

tude.<br />

Socket Weld <strong>Flan</strong>ge<br />

This flange is similar <strong>to</strong> slip-on flange, except they<br />

have a bore and a counter bore. See Figure 1-6.<br />

7

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