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The control of legionella bacteria in bakery water systems code has been approved by the health and safety commission with the consent of the secretary of state. It gives practical advice on how to comply with the law.
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The control of legionella The control of legionella Bacteria in Water Bacteria in Water
SystemsSystems
June 2013 – Bakery Water June 2013 – Bakery Water SystemsSystems
IT HAS LEGAL STATUSIT HAS LEGAL STATUS
This code has been approved by the health and safety This code has been approved by the health and safety commission with the consent of the secretary of state. It commission with the consent of the secretary of state. It gives practical advice on how to comply with the law. If gives practical advice on how to comply with the law. If you follow the advice you will be doing enough to comply you follow the advice you will be doing enough to comply with the law in respect of those specific matters on which with the law in respect of those specific matters on which the code gives advice. You may use alternative methods the code gives advice. You may use alternative methods to those set out in order to comply with the law.to those set out in order to comply with the law.However the code has a special legal status. If you are However the code has a special legal status. If you are prosecuted for breach of health and safety law, and it is prosecuted for breach of health and safety law, and it is proved that you did not follow the relevant provisions of proved that you did not follow the relevant provisions of the code, you will need to show that you have complied the code, you will need to show that you have complied with the law in some other way or a court will find you at with the law in some other way or a court will find you at faultfault..
WHERE TO STARTWHERE TO START
Risk AssessmentRisk Assessment
Schematic drawings of water systemsSchematic drawings of water systems
Written Scheme of actions required to both Written Scheme of actions required to both monitor and control bacteria in water monitor and control bacteria in water systemssystems
RISK AREASRISK AREAS
Any water system that has the potential to Any water system that has the potential to support support legionella bacterial growth, and growth, and the means to create water droplets that the means to create water droplets that can be inhaled.can be inhaled.
LEGIONELLA GROWTHLEGIONELLA GROWTH
Food – bacteria, corrosion deposits, Food – bacteria, corrosion deposits, contaminants, general sludge and debriscontaminants, general sludge and debris
Temperature – 20Temperature – 20ºCºC to 45 to 45ºCºC
Habitat – scale, tanks, dead legs, stagnant Habitat – scale, tanks, dead legs, stagnant water areas, biofilmwater areas, biofilm
LEGIONNAIRES DISEASELEGIONNAIRES DISEASE
Approximately 40 species of Approximately 40 species of legionella bacteria exist. exist. Legionella Pneumophila Serogroup 1 is most Legionella Pneumophila Serogroup 1 is most commonly causes 82% of all known cases of commonly causes 82% of all known cases of legionellosis.legionellosis.12% of reported cases are fatal.12% of reported cases are fatal.Incubation takes 2-10 daysIncubation takes 2-10 daysMost at risk are males aged 45 who are Most at risk are males aged 45 who are alcoholics and smoke and have diabetes, cancer alcoholics and smoke and have diabetes, cancer and chronic respiratory or kidney disease. i.e. and chronic respiratory or kidney disease. i.e. the immunosuppressed.the immunosuppressed.
HIGH RISK WATER SYSTEMSHIGH RISK WATER SYSTEMS
Cooling towers / evaporative condensersCooling towers / evaporative condensers
Basket washers / tub washesBasket washers / tub washes
Bread coolersBread coolers
Pressure washersPressure washers
Hot and cold water domestic systemsHot and cold water domestic systems
Lorry washersLorry washers
Splitters / sprayersSplitters / sprayers
COOLING COOLING TOWERS/CONDENSERSTOWERS/CONDENSERS
BASKET WASHERSBASKET WASHERS
BREADCOOLERSBREADCOOLERS
HOT AND COLD DOMESTICSHOT AND COLD DOMESTICS
Written schemeWritten scheme
Details all required tests, actions, Details all required tests, actions, monitoring required to minimise the growth monitoring required to minimise the growth and dissemination of legionella bacteriaand dissemination of legionella bacteria
Defines what tests are to be done, by Defines what tests are to be done, by whom and at what frequency.whom and at what frequency.
TYPICAL WRITTEN SCHEMETYPICAL WRITTEN SCHEME - - DAILYDAILY
Check systems are operating correctlyCheck systems are operating correctly
Check Check water treatment chemicals are stocked and dosing
Report any unusual conditions Report any unusual conditions immediatelyimmediately
All of the above must be loggedAll of the above must be logged
WEEKLY CHECKSWEEKLY CHECKS
Flush little used outlets, dead legs etc.Flush little used outlets, dead legs etc.
Test cooling towersTest cooling towers
Test breadcoolersTest breadcoolers
Test basket washersTest basket washers
Clean breadcoolers, basket washers, Clean breadcoolers, basket washers, splitters, tub washers etc.splitters, tub washers etc.
DIP SLIDE RESULTSDIP SLIDE RESULTS
TOWER TESTS - WEEKLYTOWER TESTS - WEEKLY
ConductivityConductivity
pHpH
Free HalogenFree Halogen
TVCTVC
1000-20001000-2000
6.5 - 9.06.5 - 9.0
0.5 - 3.00.5 - 3.0
<10<1055
BREAD COOLER TESTS - WEEKLYBREAD COOLER TESTS - WEEKLY
Conductivity / concentration factor to Conductivity / concentration factor to demonstrate chemical retention timedemonstrate chemical retention time
pH to ensure correct environment for pH to ensure correct environment for chemical activitychemical activity
Visual inspections for breadcrumb, mould Visual inspections for breadcrumb, mould etc.etc.
Dip slide for TVC and mouldDip slide for TVC and mould
Chemical tests where applicable.Chemical tests where applicable.
BASKET / TRAY / RACK BASKET / TRAY / RACK WASHERS - WEEKLYWASHERS - WEEKLY
Temperature in wash & rinse sectionsTemperature in wash & rinse sections
pH for chemical in wash tankpH for chemical in wash tank
Checks on pumps, drains, air blowers, Checks on pumps, drains, air blowers, tanks etc.tanks etc.
MONTHLYMONTHLY
TemperaturesTemperatures
Full Water analysis of towers, Full Water analysis of towers, breadcoolers, lorry washes etc by water breadcoolers, lorry washes etc by water treatment service providertreatment service provider
Bacterial analysis of varied water systems Bacterial analysis of varied water systems and random sample points.and random sample points.
Legionella tests of systems that are out of Legionella tests of systems that are out of specification and a cause for concernspecification and a cause for concern
QUARTERLYQUARTERLY
Legionella sampling of cooling towers sampling of cooling towers
Descale and sterilisation of showerheads Descale and sterilisation of showerheads and spray nozzles and spray nozzles
Bacterial analysis of incoming water Bacterial analysis of incoming water supplies to key water systems like cooling supplies to key water systems like cooling towers.towers.
Formal review of water treatment records, Formal review of water treatment records, results, checks and any corrective actionsresults, checks and any corrective actions
Bi-ANNUALBi-ANNUAL
Sterilisation of softener resin bedsSterilisation of softener resin beds
Cooling tower cleansCooling tower cleans
Full chemical deep cleans of breadcoolersFull chemical deep cleans of breadcoolers
Temperature of incoming water supplies to Temperature of incoming water supplies to water storage tanks and buildings.water storage tanks and buildings.
YEARLYYEARLY
Inspection of water storage tanksInspection of water storage tanks
Blowdown and inspection of hot water Blowdown and inspection of hot water calorifierscalorifiers
Review of written scheme, training Review of written scheme, training records, lines of communicationrecords, lines of communication
Re-issue of code of conduct, contractors Re-issue of code of conduct, contractors safe at work cert, risk assessments and safe at work cert, risk assessments and method statements for activities on sitemethod statements for activities on site
TWO YEARLYTWO YEARLY
Review of risk assessment.Review of risk assessment.
This is not limited to every 2 years. If any This is not limited to every 2 years. If any changes to a system occur, a review of the changes to a system occur, a review of the risk to that system must be completed risk to that system must be completed immediately.immediately.
FOR FURTHER FOR FURTHER INFORMATIONINFORMATION
Contact AKVO LtdContact AKVO Ltd
Tel 0844 244 8726Tel 0844 244 8726
Or visit Or visit www.akvo.co.uk