46 | INSTALLATION, OPERATION and MAINTENANCE MANUAL
Never tighten a GPHE which is under pressure.
Never tighten a GPHE while piping is connected to the follower or
connector grids.
3) Install the remaining side tie bars located between the ports (if applicable) and
tighten them evenly until the plate dimension is the same at all installed tie bars.
4) Starting with the top installed pair of tie bars (1 and 4), continue tightening
equally in 6mm (1/4 in.) increments until the platage dimension measures
approximately 5% greater than the final dimension.
5) Install the remaining tie bars above the top ports and below the bottom ports of
the frame, if applicable. Starting with the top pair and working down, tighten
each pair at 3mm (1/8 in.) increments. After each tightening cycle of 3mm (1/8
in.), return to the top set of bars and repeat the procedure.
Note: On heat exchangers using 2 inch, 42mm or 48mm diameter tie bars, it
may only be possible to achieve 1.6mm (1/16 in.) movement during the final
stages of tightening.
Note: By using hydraulic compression tools 2, 4 or 6 bolts can be compressed
at the same time. The order of bolts and increments must be the same as
above.
6) Tighten the heat exchanger to the maximum platage dimension specified on the
plate arrangement diagram. The dimension must be the same at all tie bars
(Figure 42).
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