22.06.2013 Views

Pocket Guide to Flan..

Pocket Guide to Flan..

Pocket Guide to Flan..

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

4<br />

APi<br />

FLANGES<br />

The difference between API and ANSI flanges is the<br />

material from which they are fabricated and the higher<br />

working pressure at which API flanges may be operated.<br />

API flanges are manufactured primarily for use with oil<br />

industry high-strength tubular goods. The API 6A and<br />

ANSI B. 16.5 flanges are similar dimensionally (see Ta-<br />

ble 4-1), but they cannot be interconnected without af-<br />

fecting the overall working pressure rating.<br />

Another difference is the through-bore nominal size<br />

designation, such as 113116 and 21116, for 6B flanges in<br />

place of old nominal sizes, such as 1V2-inch, and 2-inch,<br />

for consistency with 6BX flange size designations. (See<br />

Tables 4-2 and 4-3.)<br />

Some API flanges with casing or tubing threads have<br />

hub lengths greater than required for ANSI flanges.<br />

The new bore size designations for API flanges or<br />

clamp type connec<strong>to</strong>rs, will take several years <strong>to</strong> be-<br />

come a routine part of the materials vocabulary. There-<br />

fore, for reference, Tables 4-2 and 4-3 contain a complete<br />

83

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!