Ace Heating Solutions Packaged Storage Water Heater Steam-to-Water System Operating And Maintenance Manual page 9

Torque's: The following are recommended bolt torque requirements
Notes:
* Spray each stud bolt and nut generously with penetrating oil before re-torque.
** Gasket thickness before compression. All partition gaskets are
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)
Figure 1.1
Shell flange to bonnet flange joint –
SW Tube Bundle
Bolt Size Min Torque Max Torque
1/2" 45 ft-lbf.
5/8" 90 ft-lbf.
3/4" 150 ft-lbf.
7/8" 240 ft-lbf.
1" 368 ft-lbf.
1 1/8" 533 ft-lbf.
1 1/4" 750 ft-lbf.
1 1/2" 1200 ft-lbf.
Gap between flanges
approx. (X) after torque
360º Leak detection area
60 ft-lbf.
120 ft-lbf.
200 ft-lbf.
320 ft-lbf.
490 ft-lbf.
710 ft-lbf.
1000 ft-lbf.
1600 ft-lbf.
in width before compression. All gaskets
Figure 1.2
Shell flange to bonnet flange joint –
DW Tube Bundle
ACE BOILER INC.
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