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[drdave]

Hello !!!
Compressed air is cooled by cooling water medium in shell & tube heat exchanger. On start of run,cooling water temperature difference is maintained about 7 deg_C and cooler is lined up.Within 2 months period, CW outlet teperature appears to be quite lower than that of air outlet temperature despite CW outlet valves wide open.
Plant operator says: "Exchanger is fouled!!"
Engineer says: "Cooling water flow is more than specified.Therefore,No fouling. air temperature is slight higher but not beyond specified one.It will work"
Hot season is lurking overhead.
May you help me on this?? considering the following:
(1) There is no backflushing arrangement on these intercoolers.
(2) Plant has been maintaining higher cycle of concentration (about 6) at their cooling tower with special care.