CVHE-SVX02M-EN
35
Flanges with 4, 8, or 12 Bolts
Tighten all bolts to a snug tightness, following the
numerical sequence for the appropriate bolt pattern as
shown in the following figure. Repeat this sequence to
apply the final torque to each bolt.
Figure 20. Flange bolt tightening sequence (4, 8, or 12
bolts)
Flanges with 16, 20, or 24 Bolts
Tighten only the first half of the total number of bolts to
a snug tightness, following the numerical sequence for
the appropriate bolt pattern as shown in the following
figure. Next, sequentially tighten the remaining half of
the bolts in numerical order.
Figure 21. Flange bolt tightening sequence (16, 20, or
24 bolts)
Flanges with More than 24 Bolts
Sequentially tighten the first 12 bolts to a snug
tightness, following the numerical sequence as shown
in the following figure. Tighten the next
12 consecutively numbered bolts in sequence to the
final torque. Then, apply final torque to the first
12 bolts and the bolts not yet tightened (i.e.,
unnumbered bolts in the following figure). Start with
bolt “1” and move progressively around the flange in a
clockwise direction.
Figure 22. Flange bolt tightening sequence (more
than 24 bolts)
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