54 | INSTALLATION, OPERATION and MAINTENANCE MANUAL
ShutDown Process (suffix C is for Cold liquid circuit; H is for Hot liquid circuit)
STEP COLD MEDIUM HOT MEDIUM
1
Close valve (2H) slowly, reducing
pressure from operating to atmospheric
at a rate of less than 1.7 bar (25 psig)
every 10 seconds. Monitor (7) and record
pressure in at least these intervals.
Temperature drop should be limited to
10C (18F) per minute.
2 Stop pump (1H)
3
Close valve (2C) slowly, reducing
pressure at a rate of less than 1.7 bar
(25 psig) every 10 seconds. Monitor (7)
and record pressure in at least these
intervals.
4 Stop pump (1C)
5
Drain any media that could cause
corrosion or fouling during non-flowing
condition through drain valve (4C).
6
Drain any media that could cause
corrosion or fouling during non-flowing
condition through drain valve (4H).
For partial shutdown, the same limits for pressure and temperature changes apply.
Note: This is just one example of a possible system configuration. Other circuits (i.e.,
for refrigeration applications – see document GPHE IOM-REFRIG, for amine
applications – see document GPHE IOM-START), might require a different
configuration or procedure. The system integrator is ultimately responsible for ensuring
the correct components and control logic are in place, so that the heat exchanger is
operated within the permissible pressure and temperature gradients specified above.
11.3. Operation
The APV plate heat exchangers are designed according to predefined temperatures,
allowable pressure drops, design pressures and fluid compositions.
Exceeding the design temperatures and pressures can be harmful to the
equipment and personnel and must be avoided.
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