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Table 4-13<br />
API Type 6BX Integral <strong>Flan</strong>ges for 20,000 psi<br />
Maximum Working Pressure<br />
Nominal<br />
Size and Size and Wrench<br />
Bore of Number of Length of Size for<br />
Range (in.) Bolts Bolts (in.) Bolts (in.)<br />
113/16<br />
21/lS<br />
29/la<br />
31he<br />
41he<br />
71/16<br />
8 1 x71h 1%<br />
8 11/8 x 81/, 1"he<br />
8 11/4x91/, 2<br />
8 13/8 x 10 23/le<br />
8 13/, x 121/4 23/,<br />
16 2 x 171/2 31/8<br />
Table 4-14<br />
Recommended 6BX <strong>Flan</strong>ge Bolt Torque<br />
Bolt Size Torque (ft-I#)<br />
3/, .10 UNC 200<br />
718 -9 UNC 325<br />
1 -8 UNC 475<br />
11/a -8 UN 600<br />
13h -8 UN 1200<br />
11h -8 UN 1400<br />
1% -8 UN 1700<br />
13/, -8 UN 2040<br />
17/8 -8 UN 3220<br />
2 -8 UN 3850<br />
Ring<br />
Number<br />
BX-151<br />
BX-152<br />
BX-153<br />
BX-154<br />
BX-155<br />
BX-156<br />
Table 4-14 is the recommended bolt <strong>to</strong>rque requirements<br />
and wrench size required on API type 6BX flanges.<br />
Figure 4-3 shows a Type 6BX weld neck flange with a<br />
transition piece. The transition piece, when ordered, is<br />
applied by the manufacturer due <strong>to</strong> the difficulty of field<br />
welding and heat treating at the jobsite. The API mono-<br />
gram will not appear on the transition piece. Lengths of<br />
transition pieces will vary.<br />
92
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