Table : Examples of the system assessment procedure for the ship potable water system This is not a complete system assessment procedure, but for illustration only and should not be used. Each ship should do own assessment. Possible Operational Corrective PROCEDURE hazardous Likelihood Consequences Control measures Operational limits Record keeping monitoring actions event 1. Check the water quality 1. Absence of All water quality reports Filtration Source reports and certifications microbiological should be kept on the ships Measurement and contaminated from the supplier before hazards in the records for 12 months. WATER of disinfectant disinfection with C Unlikely 3 Major loading collected reports Free chlorine measurement residual or use of an microbiological 2. Continuous chlorination records should be kept on the alternative hazards at the time of 2. Chlorine residual ships records for 12 months. source bunkering no less than 2mg/L SOURCE Routine cleaning and Cleaning Inspection records Filling hose disinfection and No defections Repair records contamination B Moderate 2 Moderate Proper storage and Routine disinfection detected during Cleaning and disinfection labelling inspections Repair or inspection records Handlers training replace BUNKERING Cleaning Inspection Records Corrosion of Routine cleaning and No corrosion detected Routine and A Likely 1 Minor Cleaning and disinfection storage tanks maintenance during inspections inspections disinfection records Coating STORAGE Routine Cross connection control Repair or inspection and Inspection and testing Cross connection programme (identification replace No defections on the annual testing records between potable of cross connection, C Unlikely 3 Major backflow backflow prevention of backflow water and installation of the proper prevention devices prevention water backflow prevention assemblies assemblies assemblies) DISTRIBUTION
Table : Examples of the system assessment procedure for the ship potable water system This is not a complete system assessment procedure, but for illustration only and should not be used. Each ship should do own assessment. PROCEDURE Possible hazardous event Likelihood Consequences Control measures Operational limits Operational monitoring Corrective actions Record keeping SOURCE WATER Source contaminated with microbiological hazards C Unlikely 3 Major 1. Check the water quality reports and certifications from the supplier before loading 2. Continuous chlorination at the time of bunkering 1. Absence of microbiological hazards in the collected reports 2. Chlorine residual no less than 2mg/L Measurement of disinfectant residual Filtration and disinfection or use of an alternative source All water quality reports should be kept on the ships records for 12 months. Free chlorine measurement records should be kept on the ships records for 12 months. BUNKERING Filling hose contamination B Moderate 2 Moderate Routine cleaning and disinfection Proper storage and labelling Handlers training No defections detected during inspection Routine inspections Cleaning and disinfection Repair or replace Inspection records Repair records Cleaning and disinfection records STORAGE Corrosion of storage tanks A Likely 1 Minor Routine cleaning and maintenance No corrosion detected during inspections Routine inspections Cleaning and disinfection Coating Inspection Records Cleaning and disinfection records DISTRIBUTION Cross connection between potable water and water C Unlikely 3 Major Cross connection control programme (identification of cross connection, installation of the proper backflow prevention assemblies) No defections on the backflow prevention devices Routine inspection and annual testing of backflow prevention assemblies Repair or replace backflow prevention assemblies Inspection and testing records