String Book - Logan Oil Tools
String Book - Logan Oil Tools
String Book - Logan Oil Tools
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ring joint — fLange Data<br />
oId ApI Designations Working pressure (psi) Ring gasket new ApI Designations<br />
S/600 2,000 R or RX 6B<br />
S/900 3,000 R or RX 6B<br />
S/1500 5,000 R or RX 6B<br />
… 10,000 BX 6BX<br />
… 15,000 BX 6BX<br />
SuMMARy<br />
API has taken all flanges that used an R or RX ring gasket and typed them as 6B. They have taken<br />
all connections that use BX ring gaskets and typed them 6BS. Exceptions to this are as follows:<br />
The old S/2900 is considered obsolete by API and is not included in their designations. This series,<br />
because it is 10,000 psi working pressure and uses either an R or RX ring gasket, does not conform<br />
to the system that API has used to rename flanges. Therefore, for simplicity, and since the R and RX<br />
ring gaskets are used in the S/2900, the S/2900 is designated as a type 6B. The other exception is<br />
the new 13-5/8" 5,000 psi flange. API has arbitrarily designated these as a 6BX flange, although the<br />
working pressure is 5,000 psi and BX ring gaskets are used.
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