Air-handling and Water Systems Assessment

• Document No.

• Name of Premises

• Address
  Address

• Conducted on

  Date

• Officer

• Contact Name

• Position title

• Email

• Contact number

System Summary

• Number of towers

• Locations

• Periods of operation

  Select Continuous Timed Week days Intermittent Standby

  • Continuous
  • Timed
  • Week days
  • Intermittent
  • Standby

• Primary treatment

  Select Bromine Non-oxidising biocide Chlorine dioxide Ozone UV Other

  • Bromine
  • Non-oxidising biocide
  • Chlorine dioxide
  • Ozone
  • UV
  • Other

• Date of Installation

  Prior to 24/9/1995

  After 24/9/1994

• 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.

• 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.

• Details of treatment

• Secondary treatment?

  Yes

  No

• Secondary treatment details

  Select Bromine Non-oxidising biocide Chlorine dioxide Ozone UV Other

  • Bromine
  • Non-oxidising biocide
  • Chlorine dioxide
  • Ozone
  • UV
  • Other

• Details of treatment

• Dosing

  Select Automatic Feedback Automatic Proportional Automatic timed Manual

  • Automatic Feedback
  • Automatic Proportional
  • Automatic timed
  • Manual

Maintenance Manuals

• Are operating and maintenance manuals maintained for all plant, equipment, water treatment equipment and systems that are the subject of AS 3666

  Yes

  No

• Do operating and maintenance manuals include the following?

• Physical details of the plant, equipment and systems and pre-treatment carried out

  Yes

  No

• Recommendations on maintenance including water treatment maintenance and management

  Yes

  No

• The manufacturer's recommendations for checking, calibrating and maintaining all probes and sensors

  Yes

  No

• Recommended cleaning, disinfection and emergency decontamination procedures

  Yes

  No

• Start up, operating and shut down procedures

  Yes

  No

• Particulars of the maintenance management program including plant servicing, cleaning schedules, replacement periods for equipment items eg chemical dosing lines

  Yes

  No

• Comments

Maintenance Records

• Are up to date maintenance reports and service reports maintained for all plant, equipment and systems subject to AS3666

  Yes

  No

• Do maintenance records contain at least the following information

• Date, item of plant, equipment, equipment or system and nature of service performed

• Results of periodic testing carried out

• Details of defects found and rectification procedure undertaken

• The name of the person and company performing the service

• Are operating and maintenance manuals and maintenance service records readily available at the site for inspection

  Yes

  No

Operation and Maintenance

Air handling equipment

• Is there air handling equipment on site?

  No

  Yes

• Is the following inspected at least monthly and cleaned or replaced where necessary

• Outdoor air intakes and exhaust outlets

  Yes

  No

• Air filters

  Yes

  No

• Spray / steam humidifiers - line strainers, valves, sparge pipes, spray nozzles, spray collectors and components discharging moisture into the airstream

  Yes

  No

  N/A

• Boiling and pan type humidifiers - tanks trays and discharge devices

  Yes

  No

  N/A

• Ducts and components - coils, trays and sumps, condensate drains, tun dishes and traps

  Yes

  No

  N/A

• Is the following inspected at least quarterly and cleaned or replaced where necessary

• Ducts and components - fans

  Yes

  No

• Evaporative air-cooling equipment

  Yes

  No

• Sump drained and cleaned

• Wetted pads - cleaned / replaced as necessary

• Water strainer- cleaned when necessary

• Air filter where fitted replace when necessary

• Drainage system flushed with clean water

• Pumps and controls - check operation

• Is the following inspected at least annually and cleaned / replaced where necessary

• Ducts and components

  Yes

  No

• Ductwork in the vicinity of moisture producing equipment

• Terminal units components including coiils

• Supply air outlets

• Return air and relief air grilles

Cooling Water System

• Are the following risk factors assessed and documented?

• Stagnant water

• Presence of water in deadlegs

• System not in use due to intermittent operation / seasonal usage

• Nutrient availability / growth

• Presence of nutrients

• Presence of biofilm

• Water temperature

• Direct sunlight (promotion of algal growth)

• Poor water quality

• Cleanliness

• pH

• Presence of corrosion products

• Presence of scale and fouling

• Conductivity / TDS

• Control limits out of range

• Suspended solids (eg from nearby construction work)

• Control of water treatment chemicals

• Control of bleed

• Presence of Protozoa and algae

• Concentration of other heterotrophic bacteria

• Presence of and concentration of legionellae

• Characteristics of make-up water (physical, chemical, microbiological)

• Microbial control program

• Deficiencies in the cooling tower system

• System size (surface area available for biofilm development / water volume)

• Physical condition of system

• Open system

• Aerosol generation

• Drift elimination ( condition / efficiency)

• Location and access to cooling towers

• Aerosol dispersion

• System location and distance to other cooling water systems, air intakes and passers by.

Treatment

• 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)?

  Yes

  No

Legionellae

• Are representative samples of cooling water taken at least once per month when the system is in use

  Yes

  No

• Is an examination and control strategy implemented for the presence of legionellae?

  Yes

  No

Heterotrophic Microorganisms

• Are representative samples of cooling water taken at least once per month when the system is in use

  Yes

  No

• Is an examination and control strategy implemented for the presence of Heterotrophic Microorganisms?

  Yes

  No

Water Quality

• Is the effectiveness of the water quality management system (including water treatment) assessed at least monthly when the system is in use?

  Yes

  No

• Is the system water tested for the following?

• Conductivity/ TDS

• pH

• Other criteria necessary for the effective management of corrosion, scaling, fouling and microbial growth (eg concentration of hardness, chloride, biocides, corrosion inhibitor, dispersant)

• Is the system subject to the following checks?

• Physical condition of the system

• Operation of the bleed control system

• Operation of the makeup water system

• Cycles of concentration

• Corrosion rate

• Adequacy of scale and corrosion inhibitors

• Cleanliness of wet surfaces (ie free from accumulations of sludge, foam, slime, rust, scale, dirt and larger mineral or organic deposits)

• Changes in the local environment (eg building demolition or construction)

Water Temperature

• Is the temperature of the operating system measured at the return line to the cooling tower at least monthly when in use?

  Yes

  No

• Is the temperature of the operating system assessed against the expected temperature for the system design and current operating conditions?

  Yes

  No

• 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?

  Yes

  No

Decontamination

• 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.

  Yes

  No

• 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.

  Yes

  No

Monitoring - Results and Records

• 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?

  Yes

  No

• Are operating and maintenance manuals, risk assessment reports, test results and maintenance records readily available at the site for inspection by authorised personnel?

  Yes

  No

Cooling Towers

• 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.)

  Yes

  No

• Is the condition of the pond water satisfactory eg clean, clear, free of excess foam or the build up of silt in the sump?

  Yes

  No

• Is the tower interior in good order, free from excess scale and rust spots?

  Yes

  No

• Is the water distribution system in the tower accessible, clean and well maintained?

  Yes

  No

• Is there evidence that the flow of water across the tower is not even?

  No

  Yes

• Is there any biofilm or algal growth

  No

  Yes

• Are the tower controls in good order and accessible (dosing lines, meters, pumps, valves, conductivity probes)?

  Yes

  No

• Are there signs of water leaking from the tower or pipe work?

  No

  Yes

• Is the exterior of the tower in good condition?

  Yes

  No

• Are any make-up tanks in good condition?

  Yes

  No

  N/A

Actions

• Follow-up action

  Select Nil Advice given Letter Re-inspection Prosecution

  • Nil
  • Advice given
  • Letter
  • Re-inspection
  • Prosecution

• I have read and understood the contents of this assessment

• Proprietor / Staff name

  Sign

• Officer

  Tsyr Chiat Chew

  Tony Portelli

  Michael Turner

  Graham Oatey

  Rebecca Duffin

• Contact number

  Sign