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Table 10. Installation data for 150 psig (1034.2 kPaG) flange adapters (Style 741)
Nominal Pipe Size
in.
mm
4
114.3
5
141.3
6
168.3
8
219.1
10
273.0
12
323.9
14
355.6
16
406.4
18
457
20
508
(a)
Screw size for conventional flange-to-flange connection. Longer screws are required when flange washer must be used.
Screw-Tightening Sequence for
Water Piping Connections
This section describes a screw-tightening sequence for
flanges with flat gaskets or O-rings. Remember that
improperly tightened flanges may leak.
N N o o t t e e : : Before tightening any of the screws, align the
flanges. Flange screw torque requirements are
provided in the following table.
Table 11. Flange screw torque recommendations for
O-ring and flat-gasket piping connections
Screw Size
O-Ring
mm
in.
ft·lb
3/8
9.5
25
1/2
13
70
5/8
16
150
3/4
19
250
Note: Screw size is determined by the diameter of the screw shank.
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.
CDHF-SVX01N-EN
Assembly
Number of Assembly
Screw Size
(a)
Screws Required
in.
5/8 x 3
8
3/4 x 3-1/2
8
3/4 x 3-1/2
8
3/4 x 3-1/2
8
7/8 x 1/44
12
7/8 x 1/4
12
1 x 4-1/2
12
1 x 4-1/2
16
1.13 x 4.75
16
1.13 x 5.25
20
Gasket Type
Flat
N·m
ft·lb
N·m
34
12–18
16–24
95
33–50
45–68
203
70–90
95–122
339
105–155
142–210
I I n n s s t t a a l l l l a a t t i i o o n n : : W W a a t t e e r r P P i i p p i i n n g g
Screw Pattern Diameter
in.
mm
7.5
191
8.5
216
9.5
241
11.75
298
14.25
362
17
432
18.75
476
21.25
540
22.75
578
25.00
635
Figure 20. Flange screw tightening sequence (4, 8, or
12 screws)
1
3
4
2
4 screws
1
12
8
4
10
6
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.
Weight
kg
lb
7.7
3.5
9.3
4.2
10.3
4.7
16.6
7.5
24.2
11.0
46.8
21.2
75
34.0
90
40.8
100
45.4
120
54.4
7
1
4
5
3
8
2
6
8 screws
5
9
3
7
11
2
31
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