Figure 8-14. Tightening Plate Pack Bolts
9. Check the plate pack length ("A") during closing in at least four locations close to the bolts
being used.
10. Place the remaining bolts in position and tighten them.
11. Next, insert the corner bolts and tighten, maintaining dimension "A" of drawing- To avoid
damaging the channel plate corners, it is important that the corner bolts are not used for
closing the heat exchanger.
12. The nominal plate pack length "A" can be exceeded in some cases. The tightening can be
stopped at "A" + 2% and pressure tested.
NOTE:
When a pneumatic tightening device is used, it should be set at the maximum tightening
torque of 550 ft-lbs for DW for 3/4" bolts.
Dimension "A" must, however, must still be measured during tightening.
When the bolts are tightened by hand using a wrench, the tightening moment is estimated.
IF DIMENSION "A" IS NOT REACHED WITH APPLICATION OF MAXIMUM
TIGHTENING TORQUE:
• Check the number of plates and dimension "A".
• Check that all nuts are running freely. If not, clean and lubricate or replace.
• Fit all bolts and tighten alternately.
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