2.4.4 Torque Specifications
It is recommended that the bolts and nuts be lubricated and tightened using a torque wrench. The
bolts and nuts should be tightened to approximately 50% of the torque value during the first pass, to
approximately 80% during the second pass and to the full torque during the third pass. The maximum
torque rate values shown in TABLES 2-1 and 2-2
must not be exceeded
.
For liner materials other than those shown in the tables, the flange bolts should be tightened
sufficiently to stop any leaks but should not exceed the values shown in the tables.
TABLE 2-3 - TORQUE RECOMMENDATIONS (ANSI)
ANSI Class 150
ANSI Class 300
Liner
Material
Size
in. mm
Bolt No.
& Size
(in.)
Max.
Torque
Rate
(ft-lb)
Bolt No. &
Size
(in.)
Max.
Torque
Rate
(ft-lb)
PTFE /
TEFZEL /
Rubber
1/2 15
1 25
1-1/2 40
2 50
3 80
4 x 1/2
"
"
4 x 5/8
"
6
10
15
25
40
4 x 1/2
"
4 x 3/4
8 x 5/8
"
7
15
25
15
25
4 100
8 x 5/8
35
"
40
6 150
8 200
10 250
12 300
8 x 3/4
"
12 x 7/8
"
60
75
70
95
12 x 3/4
12 x 7/8
16 x 1
16 x 1-1/8
65
120
150
230
TABLE 2-4 - TORQUE RECOMMENDATIONS (DIN)
Liner
Material
Size
in. mm
Bolt No. &
Size
Max.Torque Rate
ft-lb Nm
PN
bar
PTFE/
Rubber
1/2 15
1 25
1-1/2 40
2 50
3 80
4 100
4 x M12
4 x M12
4 x M16
4 x M16
8 x M16
8 x M16
6.8 9.25
15.1 20.5
31.3 42.5
41.0 55.5
35.8 48.5
34.3 46.5
40
40
40
40
40
16
6 150
8 200
10 250
12 300
8 x M20
12 x M20
12 x M24
12 x M24
60.8 82.5
59.7 81.0
88.5 120.0
118.0 160.0
16
16
16
16
NOTE:
•
Torques listed are for bolts with threads lubricated
•
All meters with PTFE liners need to be re-torqued after 48 hours of operation
Series 10DX3000 Magnetic Flowmeter Instruction Manual
2-22
