For 4-bolt and 8-bolt flanges, tighten the flange bolts in a "star" pattern as shown in Figure 2-5 to
avoid localized stresses on the gaskets. The bolts and nuts should be tightened approximately 50%
during the first pass, approximately 80% during the second pass and to full tightness during the third
pass.
NOTE
All 1/10 - 1/2 inch (3 - 15 mm) size Magnetic Flowmeters are supplied
for use with 1/2 inch (15 mm) pipe flange.
TABLE 2-1. RECOMMENDED MOUNTING-BOLT TORQUES
Meter
Size
ANSI Class
150
ANSI Class
300
# of
Holes
ft. lbs.
Nm
# of
Holes
ft. lbs.
Nm
<
1/2
4
10
15
4
15
20
3/4
4
10
15
4
15
20
1
4
10
15
4
15
20
1 1/4
4
15
20
4
20
25
1 1/2
4
15
20
4
25
35
2
4
25
35
8
15
20
2 1/2
4
30
40
8
20
25
3
4
40
55
8
30
40
4
8
30
40
8
45
60
FIGURE 2-5. BOLT TIGHTENING SEQUENCE
10D1475 MINI-MAG MAGNETIC FLOWMETER INSTRUCTION MANUAL
INSTALLATION
2-7
