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New API<br />
Bore Sizes<br />
for <strong>Flan</strong>ges<br />
and Hubs (in.)<br />
111/16<br />
1 ls/16<br />
21116<br />
2~h6<br />
31116<br />
4V16<br />
71/16<br />
9<br />
11<br />
13%<br />
163/4<br />
183/4<br />
211/4<br />
Table 4-3<br />
API Bore Sizes and Matching Tubular Goods Sizes<br />
for 10,000, 15,000 and 20,000 Ib psi <strong>Flan</strong>ges<br />
and 10,000 lb. psi Clamp Type Connec<strong>to</strong>rs<br />
"lTubing<br />
Outside<br />
Diameter (in.)<br />
Casing<br />
Outside<br />
Diameter (in.)<br />
1.900<br />
2.063<br />
23/8<br />
2~/8<br />
31/2<br />
4 & 41/2 41/2<br />
4V2 through 7<br />
7% & 8%<br />
8% & 9%<br />
10314 & 11314<br />
16<br />
18516<br />
20<br />
list of the new bore size designations, the old nominal<br />
size designations, and the matching tubular goods sizes<br />
for use with API flanges or clamp type connec<strong>to</strong>rs.<br />
Bore diameter of API flanges should be the same in-<br />
side diameter as the pipe <strong>to</strong> be used.<br />
API flanges are marked with the API monogram (a reg-<br />
istered trademark), size, pressure rating, ring gasket<br />
size, bore, manufacturer, and a heat number. Some API<br />
flanges are marked with the manufacturers' part or as-<br />
sembly numbers. Consult their individual catalogs for re-<br />
spective part numbers and descriptions.<br />
85
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