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The most likely types of stainless steel used in ANSI<br />
systems will be 304, 304L, 316, and 316L. The "L" des-<br />
ignation is for a low-carbon content in the steel.<br />
Screwed fittings are usually 304 or 316 stainless.<br />
Valves are usually 316 stainless. Pipe and flanges may<br />
be any of the above types. Stainless steel stud bolts are<br />
not common.<br />
Carbon steel lap joint flanges are used with stainless<br />
steel stub ends when feasible <strong>to</strong> limit the use of the<br />
higher priced stainless flanges. See Table 5-3 for dimen-<br />
sions of stub ends.<br />
Stainless Steel Fittings<br />
Figures 5-2 through 5-5 show the most commonly<br />
used weld fittings.<br />
Identification markings are identical <strong>to</strong> the require-<br />
ments for carbon steel flanges, i.e., trademark, type of<br />
material, size, pressure rating, and bore. Descriptions<br />
are the same as for carbon steel flanges.<br />
S<strong>to</strong>rage of Stainless <strong>Flan</strong>ges<br />
The same methods described in Chapter 2 for s<strong>to</strong>ring<br />
or shipping carbon steel flanges applies as well for<br />
s<strong>to</strong>ring stainless steel flanges. However, it is preferable<br />
<strong>to</strong> s<strong>to</strong>re stainless flanges indoors if possible <strong>to</strong> protect<br />
the flange face and gasket surface. It is not necessary <strong>to</strong><br />
lubricate the face of any stainless steel flange.<br />
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