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9. Maintenance
Ì! Never open the APV plate heat
exchanger until the unit has cooled below
40°C (105°F).
Ì! Never open an APV heat exchanger,
which is under pressure from any source.
Ì! Never open an APV plate heat exchanger
with piping connected to the follower or
connector grids.
9.1 Disassembly
Close the shut-off valves and drain the heat
exchanger as much as possible.
Disconnect any pipes connected to the
follower.
Loosening and tightening of tie bars in the
APV Medium and Small range plate heat
exchangers can normally be accomplished
with ratchet wrenches/ spanners. Larger
units require hydraulic equipment or
pneumatic/ electric torque converters.
Measure and record the compressed
dimension of the plate pack before loosening
the tie bars.
Ì! As for any bolted vessel, bolts must not
be slackened or tightened indiscriminately,
but approaching a cylinder head sequence,
balancing the opening on the right and left
throughout the process.
In the process below, dimension X is the
initial compressed dimension of the plate
pack.
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