Potable Water Hygienic Management & Legionella Risk

Transcription

1 Potable Water Hygienic Management & Legionella Risk Intertek Aberdeen, Microbiology, Health & Hygiene Julie Hart BSc & Brittany Cowie BSc 1

2 Where do the legionella bacteria come from? Legionella bacteria are common and can be found naturally in environmental water sources such as rivers, lakes and reservoirs, usually in low numbers If the bacteria get in to an artificial water system they can pose a health risk People can be exposed to them through air conditioning or air cooling systems and contaminated water systems used for baths, showers etc. 2

3 Why control legionella and manage water quality? In the UK the HSE legislation drives Duty Holders to manage water systems, potable or non potable from legionella risk L8 It s the law Employee/public/tenant welfare Prevent down manning/process shut-down Reduce Risk 3

4 Water Source - Municipal Treatment 4

5 Offshore Supply Chain Harbour Standpipe Typical Supply Chain & Responsibility for Water Management Offshore Logistics Deck Crew Quayside Ops Facilities Manage r Marine Crew OIM (Responsib le Person) Medic (Competent ProductionPerson) / Chemist Maintenan ce Supervisor Onshore Support Ops Tech 5

6 Water Makers Reverse Osmosis & Evaporative Condensers Tank Inspection by ROV * 6

7 Water Makers Re-hardening (Re-mineralization) Tank Inspection by ROV * 7

8 Distribution Systems Simple Moderate Tank Inspection by ROV * Large, Complex & Varied Water Usages 8

9 Discovery of Legionnaires Disease Philadelphia, July yr to discover cause bacteria named Legionella 1 st Outbreak Identified Group of war veterans (Legionnaires) CDC Investigates 221 with Symptoms 34 Fatalities 9

10 Disease Summary 2-10 Day Incubation Fever (> 39 C)70% Cough 75% Sputum Production 45% Confusion 45% Myalgia 38% Diarrhoea 33% Headache 32% 10

11 Rates of cases of Legionnaires disease reported in the EU/EEA, by age and gender, 2011 Annual epidemiological report Reporting on 2011 surveillance data and 2012 epidemic intelligence data

12 Action Levels Following Legionella Sampling in Domestic Hot and Cold Water Systems HSG274 Part 2 Legionella bacteria (cfu/litre) More than 100 but less than 1000 Action required Either: (a) If only one or two samples are positive, system should be resampled. If a similar count is found again, a review of the control measures and risk assessment should be carried out to identify any remedial actions (b) If the majority of samples are positive, the system may be colonised, albeit at a low level with legionella. Disinfection of the system should be considered but an immediate review of control measures and risk assessment should be carried out to identify any other remedial action required. More than 1000 The system should be resampled and an immediate review of the control measures and risk assessment carried out to identify any remedial actions, including possible disinfection of the system. For other system types see HSG 274, Parts 1 & 3 12

13 Legionella Control Association (Intertek are Registered Members) The responsibility for compliance with the law lies with the owner/operator of the water system Certain tasks to confirm may be contracted to an external specialist, however the owner/operator must take all reasonable care to ensure the competence of the service provider carry out work on his behalf 13

14 Health & Hygiene Services De- Salination Audit Tank Inspection ROV Sampling Services Diesel Microbiology Water Micro (TVC Coliform E.coli Enterococci) Water Chemistry Potable Water Hydrocarbon Supply Chain Analysis & Audit Legionella Services (RA, Training, LMT, CBT, Analysis) Training for HVAC companies HVAC Air Quality Analysis Consultancy Dive Chamber Hygiene Monitoring EBS Hygiene Monitoring P&ID & Document Review Potable Water Isolation & Back Flow Prevention System Disinfection 14

15 Julie Hart/Brittany Cowie Intertek, Bridge of Don, THANKS!!! 15