ACE BOILER INC.
Page 8
Torque's: The following are recommended bolt torque requirements
MP Size Bolt
Size*
Gasket
Thickness**
Compressed
Thickness
Min Torque Max Torque***
(Y) (X) (T) (T)
4" 1/2" 1/4" 0.018" 45 ft.lb 60 ft.lb
5" 1/2" 1/4" 0.018" 45 ft.lb 60 ft.lb
6" 1/2" 3/8" 0.025" 45 ft.lb 60 ft.lb
8" 1/2" 3/8" 0.025" 45 ft.lb 60 ft.lb
10" 5/8" 3/8" 0.025" 90 ft.lb 120 ft.lb
12" 5/8" 3/8" 0.025" 90 ft.lb 120 ft.lb
16" 5/8" 1/2" 0.035" 90 ft.lb 120 ft.lb
Notes:
* Spray each stud bolt and nut generously with penetrating oil before re-torque.
** Gasket thickness before compression. All partition gaskets are in width before compression. All gaskets
expand twice their width after compression.
*** These are recommended torque values. Stud bolts must not be stressed above 60% of their yield strength.
Stud bolt torque (T) & Bolt diameter (Y)
Gap between flanges
approx. (X) after torque
Figure 1.2
Shell flange to bonnet flange joint –
SW Tube Bundle
360º Leak detection area
Figure 1.1
Shell flange to bonnet flange joint –
DW Tube Bundle
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