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2.4.3 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 2-3 and 2-4 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.
Liner
Material
PTFE /
TEFZEL /
Rubber
Liner
Material
PTFE/
Rubber
NOTE:
• Torques listed are for bolts with threads lubricated
• All meters with PTFE liners need to be re-torqued after 48 hours of operation
10DS3111E INSTRUCTION MANUAL
TABLE 2-3. TORQUE RECOMMENDATIONS (ANSI)
ANSI Class 150
Bolt No.
Size
& Size
in.
mm
1
25
1-1/2
40
2
50
4 x 5/8
3
80
4
100
8 x 5/8
6
150
8 x 3/4
8
200
10
250
12 x 7/8
12
300
TABLE 2-4. TORQUE RECOMMENDATIONS (DIN)
Size
Bolt No. &
in.
mm
1
25
1-1/2
40
2
50
3
80
4
100
6
150
8
200
10
250
12
300
ANSI Class 300
Max.
Bolt No. &
Torque
Size
Rate
(in.)
(in.)
(ft-lb)
"
10
"
15
4 x 3/4
25
8 x 5/8
"
40
35
60
12 x 3/4
"
75
12 x 7/8
70
16 x 1
"
95
16 x 1-1/8
Max.Torque Rate
Size
ft-lb
4 x M12
15.1
4 x M16
31.3
4 x M16
41.0
8 x M16
35.8
8 x M16
34.3
8 x M20
60.8
12 x M20
59.7
12 x M24
88.5
120.0
12 x M24
118.0
Max.
Torque
Rate
(ft-lb)
"
15
25
15
"
25
"
40
65
120
150
230
PN
Nm
bar
20.5
40
42.5
40
55.5
40
48.5
40
46.5
16
82.5
16
81.0
16
16
160.0
16
2-17
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