Trane Technologies CenTraVac CVHE - Flanges with 4, 8, or 12 Screws; Flanges with 16, 20, or; Screws; Flanges with more than

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CVHE-SVX005B-EN
Flanges with 4, 8, or 12 Screws
Tighten all screws to a snug tightness, following the
numerical sequence for the appropriate pattern as
shown in the following figure. Repeat this sequence to
apply the final torque to each screw.
Figure 20. Flange screw tightening sequence (4, 8, or
12 screws)
1 3
4 2
1
3
4 5
7
8
2 6
1
3
4
10 11
9
5
7
8
12
26
4 screws 8 screws
12 screws
Flanges with 16, 20, or 24 Screws
Tighten only the first half of the total number of screws
to a snug tightness, following the numerical sequence
for the appropriate pattern as shown in the following
figure. Next, sequentially tighten the remaining half of
the screws in numerical order.
Figure 21. Flange screw tightening sequence (16, 20,
or 24 screws)
16 screws 20 screws
24 screws
1
5
9
20
2
3
4
6
7
8
10
19
18
17
16
15
14
13
12
11
1
24
5
9
20
2
23
3
4
22
6
7
8
10
19
18
17
21
16
15
14
13
12
11
1
5
9
2
3
4
6
7
8
10
16
15
14
13
12
11
Flanges with More than 24 Screws
Sequentially tighten the first 12 screws to a snug
tightness, following the numerical sequence as shown
in the following figure. Tighten the next
12 consecutively numbered screws in sequence to the
final torque. Then, apply final torque to the first
12 screws and the screws not yet tightened (i.e.,
unnumbered screws in the following figure). Start with
screw “1” and move progressively around the flange in
a clockwise direction.
Figure 22. Flange screw tightening sequence (more
than 24 screws)
1
24
5
9
20
2
23
3
4
22
6
7
8
10
19
18
17
21
16
15
14
13
12
11
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