Air-Handling and Water Systems of Buildings - Microbial
Control - Performance Based Maintenance of Cooling Water
Systems
AS/NZS 3666 Part 3 - The Australian
Standard/New Zealand Standard AS/NZS 3666 Part 3 is
concerned with the control of microorganisms, including
Legionella bacteria within air handling and cooling
water systems in commercial buildings.
AS/NZS 3666 Part 3 considers a performance based approach
to the maintenance of such building services systems
and looks at the use and implementation of automated
water treatment programs, combined with monitoring,
assessment and control strategies to help reduced the
risks associated with microorganisms, such as Legionella
bacteria in cooling water systems.
Additional Standards
You should be aware that this standard, AS/NZS 3666
Part 3 only covers the performance of maintenance programs
for cooling water systems and that it should be used
together with AS/NZS
3666 Part 1 and the relevant clauses of AS/NZS
3666 Part 2. It is also important to note that issues
including facilities and building maintenance manuals,
site log books and health and safety procedures, are
as important for the application of AS/NZS 3666 Part
3 as they are for a prescriptive approach to maintaining
clean cooling water systems.
Contents of AS/NZS 3666 Part 3 Include:
Preface
Contents
Foreword
Section 1 Scope and General
1.1 Scope
1.2 Objective
1.3 Functional Statement
1.4 Performance Requirements
1.5 Referenced Documents
1.6 Definitions
1.6.1 Cycles of concentration
1.6.2 Key performance indicator
1.6.3 Total dissolved solids (TDS)
1.7 Testing
Section 2 Identification and Assessment of
Risk Factors
2.1 Scope of Section
2.2 Risk Factors
2.3 Risk Assessment
2.4 Water Treatment
Section 3 Performance Monitoring and Control
3.1 Scope of Section
3.2 Presence of Legionellae
3.2.1 Monitoring
3.2.2 Assessment
3.2.3 Control
3.3 Presence of Other Heterotrophic Microorganisms
3.3.1 Monitoring
3.3.2 Assessment
3.3.3 Control
3.4 Water Quality Management
3.4.1 Monitoring
3.4.2 Assessment
3.4.3 Control
3.5 Water Temperature
3.5.1 Monitoring
3.5.2 Assessment
3.5.3 Control
3.6 Start Up
3.7 Results and Records
3.8 Evidence of Compliance
Appendix A – Cooling Water Sampling
Procedure
A1 Scope
A2 Personnel Carrying Out Sampling
A3 Sample Storage and Transport
A4 Particulars of Sampling Containers
A5 Particulars of Sampling
A6 Technique of Sample Collection
Appendix B – On-Line Disinfection Procedure
for Cooling Water Systems
B1 Scope
B2 Biodispersant
B3 Disinfection
B4 Circulation
B5 Operation
Appendix C – Decontamination Procedures
for Cooling Water Systems
C1 Scope
C2 On-Line Decontamination
C3 System Decontamination
Additional Information & Expert Assistance
For further information and expert assistance please
contact us, emailing australia@legionellacontrol.com.
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