9
RSL Torque Wrench
4.2
Choose Flange Assembly Method
[conitnued]
d. Tighten sequence:
i. First, second and third stages: Cross-
pattern tightening sequence in Fig. 4.2-1
(b).
ii. Fourth, and Final Stage:
1. Clockwise
“adjacent
bolt-to-bolt
tightening” in Fig. 4.2-1 (c).
2. Continue until all nuts stop rotating.
4.2.3 TIGHTENING METHOD 3 – Stud Elongation
Tightening
a.
Determine torque value for proper
elongation.
i. Contact Enerpac Customer Service
b.
Follow steps in TIGHTENING METHOD
2
c. After 4th stage, if studs are:
i. Short – increase torque and tightening
until studs are proper length.
ii. Long – loosen until studs are proper
length.
d.
Caution: Do not over-stretch studs
because joint parts may fail.
4.2.4 TIGHTENING METHOD 4 – Use Guidelines
for Pressure Boundary Bolted Flange Joint
Assembly (ASME PCC-1-2013)
TABLE 4.2-1
Flange Assembly Example – Method 2
Legacy Cross-Pattern Tightening Sequence
Flange
(# Bolts)
Pattern
4
1-3-2-4
8
1-5-3-7-2-6-4-8
12
1-5-9-3-7-11-2-6-10-4-8-12
16
1-9-5-13-3-11-7-15-2-10-6-14-4-12-8-16
20
1-13-5-17-9-3-15-7-19-11-2-14-6-18-10-4-
16-8-20-12
28
1-13-21-5-17-9-25-3-15-23-7-19-11-27-2-
14-22-6-18-10-26-4-16-24-8-20-12-28
32
1-17-9-25-5-21-13-25-3-19-11-31-7-29-15-
27-2-18-10-30-6-22-14-26-4-20-12-32-8-
24-16-28
Fig 4.2-1 Legacy Cross-Pattern Tightening
Sequence for 8 Bolt Circular Flange
a. Marked Up 8 Bolt Flange
b. 1st, 2nd, and 3rd Stage Cross-Pattern
Sequence
c. 4th and Final Stage Adjacent Bolt to
Bolt Sequence
Fig 4.2-1 Notes:
•
When bolt numbering is correct:
◊ All bolts on right side of flange will be
odd numbers (e.g. “1”, “5”, “3”, and “7”).
◊ Bolts on left will be even numbers.
•
For more application based procedures
refer to:
◊ Guidelines for Pressure Boundary
Bolted Flange Joint Assembly (ASME
PCC-1-2013).
2
1
3
4
5
6
7
8
1
5
3
7
2
6
4
8
2
1
3
4
5
6
7
8
1
5
3
7
2
6
4
8
2
1
3
4
5
6
7
8
1
5
3
7
2
6
4
8