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through a furnace where it is heated <strong>to</strong> 2,600~ and then<br />
bent in<strong>to</strong> an oval by form rollers. It then proceeds<br />
through a welding stand where the heat in the skelp and<br />
pressure exerted by the rolls forms the weld. The pipe is<br />
stretched <strong>to</strong> a desired OD and ID, and cut <strong>to</strong> lengths.<br />
(Couplings if ordered for any size pipe will be hand tight<br />
only.)<br />
ASTM A-120<br />
Pipe Specifications<br />
Sizes V8-in. <strong>to</strong> 16-ins., standard weight, extra strong,<br />
and double extra strong (Std. Wt., XS, XXS). The specifi-<br />
cation covers black and hot-dipped galvanized welded<br />
and seamless average wall pipe for use in steam, gas,<br />
and air lines.<br />
Markings. Rolled, stamped or stenciled on each length of<br />
pipe: the brand name, ASTM A-120, and the length of the<br />
pipe. In case of bundled pipe, markings will appear on a<br />
tag attached <strong>to</strong> each bundle. Table 3-2 shows a bundling<br />
schedule.<br />
ASTM A-53<br />
Sizes V8-in. <strong>to</strong> 26-ins., standard weight, extra strong,<br />
and double extra strong, ANSI schedules 10 through 160<br />
(see Table 3-1 for ANSI pipe schedules). The specifica-<br />
tion covers seamless and welded black and hot-dipped<br />
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