The table shown below illustrates the main elements of a maintenance schedule for the proper control of a cooling water system. Those items which are essential for the prevention of the multiplication and spread of legionnella are in the shaded area.
NB. Before work begins:
1. Ensure that pumps, fans etc. are electrically isolated.
2. If the tower has been closed down or if it has not been the subject of a regular maintenance programme, then refer to the Cleaning and Disinfection section in the Tower Maintenance Guide (available from F&R Products).
Description of Service |
Start Up |
Weekly |
Monthly |
Every Six Months |
Shut-down |
Annually |
Inspect general condition of unit |
l |
l |
|
|
l |
|
Clean debris from unit |
l |
|
l |
|
l |
|
Inspect sump – clean and flush if required |
l |
|
|
l |
|
|
Clean sump strainer |
l |
|
l |
|
|
|
Check and adjust sump water level and make-up |
l |
|
l |
|
|
|
Inspect heat transfer section for fouling |
l |
|
l |
|
|
|
Inspect water distribution |
l |
|
l |
|
|
|
Check drift eliminators |
l |
l |
|
|
|
|
Check water quality against guidelines |
l |
l |
|
|
|
|
Check chemical feed equipment |
l |
l |
|
|
|
|
Check and adjust bleed rate |
l |
l |
|
|
|
|
Check pan heaters and accessories |
|
|
l |
|
|
|
Drain pump and piping |
|
|
|
|
l |
|
Inspect protective finish |
|
|
|
|
|
l |
Check fans for rotation without obstruction |
l |
|
|
|
|
|
Check fan and pump motors for proper rotation |
l |
|
|
|
|
|
Check unit for unusual noise/vibration |
l |
l |
|
|
|
|
Check motor(s) voltage and current |
l |
|
|
l |
|
|
Lubricate fan shaft bearings |
l |
|
|
l |
l |
|
Check and service fan drive system |
l |
|
l |
|
|
|
Clean sump drift, packing |
|
|
|
l |
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