Title Page
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Document No.
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Name of Premises
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Address
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Conducted on
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Officer
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Contact Name
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Position title
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Email
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Contact number
System summary
System Summary
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Number of towers
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Locations
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Periods of operation
- Continuous
- Timed
- Week days
- Intermittent
- Standby
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Primary treatment
- Bromine
- Non-oxidising biocide
- Chlorine dioxide
- Ozone
- UV
- Other
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Details of treatment
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Secondary treatment?
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Secondary treatment details
- Bromine
- Non-oxidising biocide
- Chlorine dioxide
- Ozone
- UV
- Other
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Details of treatment
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Dosing
- Automatic Feedback
- Automatic Proportional
- Automatic timed
- Manual
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Date of Installation
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The Operation and Maintenance of air-handling and water systems and cooling towers installed in buildings prior to 24/9/1994 must be undertaken as per Australian Standard 3666 AS/NZ3666.2.2011 Air handling and water systems of buildings -Microbial control - Part 2: Operation and maintenance and AS/NZS3666.3.2011 Air handling and water systems of buildings - Microbial control - Part 3: Performance based maintenance of cooling water systems.
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The design and installation of air handling and water systems and cooling towers installed in buildings after 24/9/1994 must be as per Australian Standard AS/NZS 3666.1.2011 Air handling and water systems of buildings- microbial control- part 1: Design, installation and commissioning and the operation and maintenance of air handling and water systems and cooling towers installed in buildings must be undertaken as per Australian standard 3666 AS/NZS3666.2:2011 Air handling and water systems of buildings- microbial control- part 2: Operation and maintenance and AS/NZS3666.3:2011 Air handling and water systems of buildings- Microbial control- Part 3: Performance based maintenance of cooling water systems.
Maintenance Manual / Records
Maintenance Manuals
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Are operating and maintenance manuals maintained for all plant, equipment, water treatment equipment and systems that are the subject of AS 3666
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Do operating and maintenance manuals include the following?
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Physical details of the plant, equipment and systems and pre-treatment carried out
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Recommendations on maintenance including water treatment maintenance and management
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The manufacturer's recommendations for checking, calibrating and maintaining all probes and sensors
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Recommended cleaning, disinfection and emergency decontamination procedures
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Start up, operating and shut down procedures
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Particulars of the maintenance management program including plant servicing, cleaning schedules, replacement periods for equipment items eg chemical dosing lines
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Comments
Maintenance Records
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Are up to date maintenance reports and service reports maintained for all plant, equipment and systems subject to AS3666
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Do maintenance records contain at least the following information
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Date, item of plant, equipment, equipment or system and nature of service performed
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Results of periodic testing carried out
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Details of defects found and rectification procedure undertaken
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The name of the person and company performing the service
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Are operating and maintenance manuals and maintenance service records readily available at the site for inspection
Operation and Maintenance
Air handling equipment
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Is there air handling equipment on site?
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Is the following inspected at least monthly and cleaned or replaced where necessary
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Outdoor air intakes and exhaust outlets
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Air filters
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Spray / steam humidifiers - line strainers, valves, sparge pipes, spray nozzles, spray collectors and components discharging moisture into the airstream
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Boiling and pan type humidifiers - tanks trays and discharge devices
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Ducts and components - coils, trays and sumps, condensate drains, tun dishes and traps
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Is the following inspected at least quarterly and cleaned or replaced where necessary
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Ducts and components - fans
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Evaporative air-cooling equipment
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Sump drained and cleaned
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Wetted pads - cleaned / replaced as necessary
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Water strainer- cleaned when necessary
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Air filter where fitted replace when necessary
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Drainage system flushed with clean water
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Pumps and controls - check operation
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Is the following inspected at least annually and cleaned / replaced where necessary
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Ducts and components
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Ductwork in the vicinity of moisture producing equipment
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Terminal units components including coiils
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Supply air outlets
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Return air and relief air grilles
Cooling Water System
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Are the following risk factors assessed and documented?
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Stagnant water
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Presence of water in deadlegs
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System not in use due to intermittent operation / seasonal usage
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Nutrient availability / growth
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Presence of nutrients
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Presence of biofilm
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Water temperature
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Direct sunlight (promotion of algal growth)
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Poor water quality
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Cleanliness
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pH
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Presence of corrosion products
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Presence of scale and fouling
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Conductivity / TDS
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Control limits out of range
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Suspended solids (eg from nearby construction work)
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Control of water treatment chemicals
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Control of bleed
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Presence of Protozoa and algae
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Concentration of other heterotrophic bacteria
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Presence of and concentration of legionellae
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Characteristics of make-up water (physical, chemical, microbiological)
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Microbial control program
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Deficiencies in the cooling tower system
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System size (surface area available for biofilm development / water volume)
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Physical condition of system
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Open system
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Aerosol generation
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Drift elimination ( condition / efficiency)
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Location and access to cooling towers
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Aerosol dispersion
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System location and distance to other cooling water systems, air intakes and passers by.
Treatment
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Are cooling water systems provided with automatically regulated water treatment systems for effective management of corrosion, scaling, fouling and microbial growth (both sessile and planktonic)?
Monitoring
Legionellae
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Are representative samples of cooling water taken at least once per month when the system is in use
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Is an examination and control strategy implemented for the presence of legionellae?
Heterotrophic Microorganisms
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Are representative samples of cooling water taken at least once per month when the system is in use
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Is an examination and control strategy implemented for the presence of Heterotrophic Microorganisms?
Water Quality
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Is the effectiveness of the water quality management system (including water treatment) assessed at least monthly when the system is in use?
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Is the system water tested for the following?
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Conductivity/ TDS
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pH
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Other criteria necessary for the effective management of corrosion, scaling, fouling and microbial growth (eg concentration of hardness, chloride, biocides, corrosion inhibitor, dispersant)
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Is the system subject to the following checks?
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Physical condition of the system
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Operation of the bleed control system
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Operation of the makeup water system
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Cycles of concentration
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Corrosion rate
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Adequacy of scale and corrosion inhibitors
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Cleanliness of wet surfaces (ie free from accumulations of sludge, foam, slime, rust, scale, dirt and larger mineral or organic deposits)
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Changes in the local environment (eg building demolition or construction)
Water Temperature
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Is the temperature of the operating system measured at the return line to the cooling tower at least monthly when in use?
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Is the temperature of the operating system assessed against the expected temperature for the system design and current operating conditions?
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If the temperature of the operating system falls outside the expected range are the operating conditions for the system, operating pumps and cooling tower fans reviewed?
Decontamination
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Is the online decontamination procedure carried out in accordance with the following<br><br>a. Dose the recirculating water with a bio dispersant and a halogen based compound, equivalent to at least 5mg/l of free residual chlorine for at least one hour, whilst maintaining an appropriate pH and monitor at intervals of 15 minutes.<br><br>b. Review the water treatment program, tower operation and maintenance program.<br><br>c. Correct any faults and implement any necessary changes.<br><br>d. Record all actions and observations in the maintenance report.<br><br>e. Recommission and repassivate the circulating cooling water system and reinstate the water treatment program.
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Is the system decontamination carried out in accordance with the procedure outlined below.<br><br>a. Isolate any cooling tower fan to prevent operation.<br><br>b. Dose the recirculating water with a bio dispersant and a halogen based compound, equivalent to at least 5 mg/l of free residual chlorine for at least one hour, whilst maintaining an appropriate pH and monitor at intervals of 15 minutes.<br><br>c. Isolate the cooling tower pumps and drain to the sewer/ trade waste.<br><br>d. Open all system drains temporarily, to flush drain lines with disinfected water.<br><br>e. Clean all wetted surfaces of the cooling tower in accordance with the supplier's instructions or by using water spray and mechanical cleaning as necessary. <br><br>f. Refill the cooling water system and restart water circulation pumps. <br><br>g. Dose the recirculating water with a bio dispersant and a halogen based compound, equivalent to at least 1 to 5 mg/l of free residual chlorine for at least 30 minutes, whilst maintaining an appropriate pH and monitor at intervals of 15 minutes.<br><br>h. Record all actions and observations in the maintenance report.<br><br>i. Recommission the circulating cooling water system and reinstate the water treatment program.
Monitoring - Results and Records
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Is a report prepared each month detailing the test type, the control range, the test results, remedial actions taken or recommended and the name of the person or organisation undertaking the assessment?
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Are operating and maintenance manuals, risk assessment reports, test results and maintenance records readily available at the site for inspection by authorised personnel?
Physical Condition
Cooling Towers
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Are the drift eliminators high efficiency in good condition and effective ( There should be no readily apparent emission of droplets in the exit air-stream.)
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Is the condition of the pond water satisfactory eg clean, clear, free of excess foam or the build up of silt in the sump?
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Is the tower interior in good order, free from excess scale and rust spots?
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Is the water distribution system in the tower accessible, clean and well maintained?
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Is there evidence that the flow of water across the tower is not even?
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Is there any biofilm or algal growth
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Are the tower controls in good order and accessible (dosing lines, meters, pumps, valves, conductivity probes)?
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Are there signs of water leaking from the tower or pipe work?
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Is the exterior of the tower in good condition?
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Are any make-up tanks in good condition?
Actions and Follow-up
Actions
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Follow-up action
- Nil
- Advice given
- Letter
- Re-inspection
- Prosecution
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I have read and understood the contents of this assessment
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Proprietor / Staff name
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Officer
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Contact number