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API Type 6B and 6BX <strong>Flan</strong>ges<br />
2,000-20,000 psi Maximum Working Pressures<br />
Figure 4-1 illustrates a threaded flange. Threaded<br />
flanges do not have a bore schedule, but do have a de-<br />
scription of the type of thread, such as casing, tubing, or<br />
line pipe. The flange illustrated was made by National<br />
Supply Company, and will service 15,000 lb. WOG pres-<br />
sure.<br />
Figure 4-2 shows a weld neck flange manufactured by<br />
the same company, which will service 15,000 Ibs. WOG<br />
pressure. This type flange does have a bore schedule.<br />
Tables 4-4 through 4-13, indicate the size range, bolt<br />
requirements, wrench size for the bolts, and the ring gas-<br />
ket number required for API type 6B and 6BX flanges.<br />
(Text continued on page 88)<br />
Table 4.4<br />
API Type 6B <strong>Flan</strong>ges for 2000 psi Maximum Working Pressure<br />
Nominal Old<br />
Size and Nominal Size and Wrench Ring<br />
Bore of Size of Number of Length of Size for Number<br />
<strong>Flan</strong>ge (in.) <strong>Flan</strong>ge (in.) Bolts Bolts (in.) Bolts (in.) n or RX<br />
113/lS 11/2 4 3/4 x 41/4 11/4 20<br />
2V16 2 8 5/8 x 4V2 11/16 23<br />
29118 21/2 8 3/4 x 5 11/4 26<br />
31/8 3 8 3/4 x 51/4 11/4 31<br />
41/16 4 8 7/8 X 6 17/16 37<br />
51/8 5 8 1 X 63/4 1% 41<br />
71/16 6 12 1 X 7 1% 45<br />
9 8 12 11/8 X 8 113118 49<br />
11 10 16 11/4 X 83/4 2 53<br />
13518 12 20 11/4 X 9 2 57<br />
16314 16 20 lV2 X 10114 2% 65<br />
17314 18 20 15/8 X 11 29/le 69<br />
211/4 20 24 15/8 x 113/4 29/16 73<br />
87
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