INSTALLATION, OPERATION and MAINTENANCE MANUAL | 55
Sudden changes in the operating pressures and temperatures must be avoided.
Shock cooling of the APV GPHE may cause leakage, due to sudden contraction
of the sealing gaskets.
Temperature and pressure cycling must be limited to the rate changes specified
in Section 11-1 (startup and shutdown).
Deviations from the designated fluid composition may cause corrosion of the plates and
damage of the gaskets, even if the deviations occur over relatively short time periods.
Before starting operation, you should ensure that the media do not exceed the corrosion
resistance level of the materials chosen for your heat exchanger. Even unprocessed
water may contain a sufficiently high level of corrosive content (e.g., chloride content)
that may attack the plate surface. A high temperature may accelerate the corrosion
process. Visit www.spxflow.com for more info.
Once normal operating conditions are reached, temperature and pressure drops must
be regularly checked. Increasing pressure drops and/or falling temperature may indicate
reduced performance of the heat exchanger. This must be investigated to determine the
cause. See Section 15.0 Troubleshooting
For DuoSafety GPHE’s, regular external leakage inspection must be made of the plate
pack edges, to look for leaks as they will start quite small and can quickly evaporate.
Where CIP-cleaning is carried out at regular intervals, check approximately 30 minutes
after starting the circulation of hot CIP liquid, thoroughly inspecting the floor below the
plate pack for any drops. Leakage is more easily detected if the area under the plate
pack is dry before the inspection procedure starts. If the floor is not dry, an indicator
liquid must be sprayed on the floor and on the plate pack to detect product or CIP drops
from the heat exchanger.
12. MAINTENANCE
Never open a pressurized GPHE.
Never open a GPHE until the equipment is below 38°C (100 °F).
Never open a GPHE while piping is connected to the follower or connector
grids.
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