ABB MINI-MAG 10D1475 Series - Figure 2-5. Bolt Tightening Sequence; Table 2-1. Recommended Mounting-Bolt Torques

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
14101541520
1 1/4 4 15 20 4 20 25
1 1/2 4 15 20 4 25 35
24253581520
2 1/2 4 30 40 8 20 25
34405583040
48304084560
FIGURE 2-5. BOLT TIGHTENING SEQUENCE
10D1475 MINI-MAG MAGNETIC FLOWMETER INSTRUCTION MANUAL
INSTALLATION 2-7