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Page 3 of 4 RT2_InstallationGuide_022219
Safety
Through
Knowledge
and
Performance
INSTALLATION INSTRUCTIONS
Graphite and Metal Rupture Disk Holders
Rupture Disk Series: RT2, RT2T, RE2, RE2T and Variants
Table 1 – Torque Values
Typical Bolt Tightening Sequences
4 Bolt Flange
8 Bolt Flange
Standard Conditions for Torque Calculations
a) The torque values provided above should be used with caution. Engineering judgment and experience is
needed to allow for proper interpretation. Due to the inherent variations in the coefficient of friction, both
in the threads and between the nut face and clamped surface, there is no single “correct” tightening
torque for all circumstances.
A range of values can be determined however given the anticipated frictional scatter. The amount of
frictional scatter, which the engineer allows for when determining the clamp force and tightening torque,
should be based upon experimental results taken from the application.
b) Recommended torque values do not consider piping stress or alignment.
c) Consult ZOOK for recommended torque values for non-standard conditions.
Actual field conditions may differ from room temperature conditions on which the above torque values are based
on. In addition, these values are based on raised face welding neck flanges, free running treads and well
lubricated bolts with a coefficient of friction of µ =0.180, 1/8” thk compressed fiber gaskets with design seating
stress (y) of 4400 psi and gasket factor (m) of 5.2. Re-torqueing of bolts may be necessary to nullify loss caused
by gasket compression set. ASME Code Sect. VIII Div. 1 was followed for estimating required seating and
operating bolt loads.
NOMINAL
SIZE
TORQUE FT-LB (N-m)
ANSI
DIN
NPS
DN
150
PN6
PN10
PN16
1
25
9 (12.2)
7 (9.5)
9 (12.2)
1 ½
40
12 (16.3)
12 (16.3)
15 (20.3)
2
50
17 (23.0)
14 (19.0)
17 (23.0)
2 ½
65
30 (40.7)
30 (40.7)
30 (40.7)
3
80
34 (46.1)
34 (46.1)
17 (23.0)
4
100
25 (33.9)
48 (65.1)
25 (33.9)
5
150
46 (62.4)
N/A
46 (62.4)
8
200
64 (86.8)
N/A
64 (86.8)
43 (58.3)
10
250
80 (108.5)
N/A
80 (108.5)
N/A
12
300
80 (108.5)
N/A
80 (108.5)
N/A
