Chapter 3: Cooling towers and evaporative condensers

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3.1 General

3.2 Design

3.3 Start-up, shut-down, and commissioning

3.4 Operation & maintenance

Inspection

Cleaning

Disinfection

Water treatment plan

3.5 Minimum bacterial testing requirements

Water sampling locations

Bacterial testing results

Minimum bacterial testing requirements and frequency (normal operation)

Minimum bacterial testing requirements (emergency mode)

Dipslide testing limits and actions

Legionella bacteria culture testing limits and actions

Quantitative polymerase chain reaction testing limits and actions

3.6 Operation, maintenance and testing schedule

Table 3.1: Cooling towers operation and maintenance and testing summary
Activity Item Minimum frequency
Operation & maintenance Inspection
  • Start-up Procedure
  • Weekly
  • Monthly
  • Annual
Cleaning
  • Start-up Procedure
  • Annual
Disinfection
  • Start-up Procedure
  • When required by bacterial testing results
Testing Dip-slide test
  • Weekly, when cooling tower is in operation
Legionella bacteria culture test
  • When the condenser water temperature is above 18 °C and the dip-slide test results indicate TBC > 100,000 cfu
  • When a qPCR test results indicate Legionella Pneumophila  100 GE/mL
  • Monthly when cooling tower is in operation
qPCR test
  • Weekly, when used during emergency mode
  • 24 hours following completion of start-up cleaning and disinfection
  • When a Legionella culture test results indicate LPTOT  10 cfu/mL
  • When a qPCR test results indicate Legionella Pneumophila > 100 GE/mL

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