Prevention of Legionnaires Disease

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HK EMSD published COP
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    1 Prevention ofLegionnaires’ Disease Code of Practice    2 Preface Hong Kong must have a healthy living environment to align with the world-class cities. Health is fundamental not only to individuals but also to the community as a wholewhen putting Hong Kong on the road to prosperity.Despite the small number of reported Legionnaires’ Disease cases in HongKong, effective protection of the community from this deadly disease called for theestablishment of the Prevention of Legionnaires’ Disease Committee in 1985 to formulatestrategies in the prevention and management of the possible outbreak of Legionnaires’ Disease.The Committee first published in 1994 a Code of Practice for the Prevention of Legionnaires’ Disease incorporating prudently the experience from other developed countries.This Code of Practice provides good sense of common purpose for the building owners andbuilding services practitioners to join hands in the proper design, operation and maintenance of the related facilities to prevent the possible outbreak of Legionnaires’ Disease.The revision of the Code of Practice has been completed on the threshold of thenew century taking into account the experience and evolving knowledge of other countries inpast years. The revised Code of Practice will surely safeguard our environment to enhance ourprosperity and the quality of our lives. I am confident that with the co-operation of all thoseconcerned to follow the Code of Practice, we are able to build a better future for Hong Kong.LEE Shing-see, JPSecretary for WorksThe Government of the Hong KongSpecial Administration Region    3 Introductory Notes This Code of Practice recommends the good practices to be followed in the design,installation, operation and maintenance of air-conditioning and water systems, especiallycooling towers and centralised hot water supply systems for the effective control andprevention of the Legionnaires' Disease.The Code is prepared by the Prevention of Legionnaires' Disease Committee withreference to similar codes overseas, such as Australia, United Kingdom, Singapore, etc. It isintended that this Code of Practice should be read and followed by all architects, engineers,building owners and building managers, as well as Government authorities.I would like to express my sincere gratitude for the effort paid by the former and currentmembers of the Committee in preparing and revising this Code.Uy Tat-pingChairmanPrevention of Legionnaires’ Disease CommitteeHong Kong    4 CONTENT   PrefaceIntroductory Notes1. Background2. Medical Aspects3. The Hong Kong Situation4. Guidelines on Prevention of Legionnaires’ Disease4.1 General Precautionary Measures4.1.1 Design Precautions4.1.2 Operation and Maintenance Precautions4.2 Air-conditioning Systems4.2.1 Cooling Tower4.2.1.1 Design Precautions4.2.1.2 Operation and Maintenance Precautions4.2.2 Other Components of Air-conditioning System4.2.3 Proper Record Keeping4.3 Water System4.3.1 Design Precautions4.3.2 Operation and Maintenance4.4 Other Water SystemsAnnex I FORM 2 – Quarantine and Prevention of Disease Ordinance (Cap. 141)Annex II Occupational Safety and Health Ordinance (Cap. 509) Notification of Occupational DiseaseFigure 1 Relationship between Proliferation of Legionella and Temperature of Water Systems whenin Use and when Other Growth Factors are PresentFigure 2 Transmission of Legionnaires’ DiseaseFigure 3 Organization of the Prevention of Legionnaires’ Disease CommitteeFigure 4 Various Types of Cooling TowersFigure 4A Induced Draught Counter Flow Cooling TowerFigure 4B Induced Draught Counter Flow Cooling Tower, Fibreglass TypeFigure 4C Forced Draught Counter Flow Cooling TowerFigure 4D Crossflow Cooling TowerFigure 5 Types of Drift EliminatorsFigure 6 Cooling Tower Automatic Bleed-off ControlFigure 7 AHU/FCU Drain TrayFigure 8 Air Break and U-trap (Water Seal) at AHU/FCU Condensate Drain PipeworkFigure 9 Pumped Circulation in Calorifier to Reduce or Eliminate Temperature StratificationFigure 10 Thermostatic Mixing ValveReferencesMembers of the Prevention of Legionnaires’ Disease Committee
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