INSTALLATION, OPERATION and MAINTENANCE MANUAL | 47
Figure 41: Tie Bar Numbering Figure 42: Step 6 – maximum platage
Refer to the plate arrangement diagram for the maximum compressed
dimension of the plate pack.
Note: Due to the o-ring type gasket seal, the final closed dimension is
determined by dimension, not tie bar torque.
Manufacturing tolerances of the plate may result in the actual minimum platage
dimension varying. Refer to your plate arrangement diagram for actual
minimum and maximum dimensions.
In multi section heat exchangers, differences in pressures through the sections
can set up a concertina effect where higher pressure sections open-up by a few
hundredths of a millimeter per plate and lower pressure sections close down.
Opening-up of higher pressure sections can cause leakage of that section. The
robustness of the APV GPHE is also linked with the percentage division of plate
counts in various sections.
Note: To ensure leak free operation in such applications, it is even more
important that the plates contact well with each other. Well contacting plates are
far more resistant to the concertina effect. Always tighten to full plate contact.
The concertina effect at minimum compressed dimension is always very small
and therefore the plate pack is more rigid and robust against leakage.
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