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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 />

(Text continued on page 110)<br />

109

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