Drinking water guidance 1


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Drinking water guidance 1

  2. 2. DRINKING WATER – ON BOARD SHIPS CLEAN DRINKING WATER DRINKING WATER – ON BOARD SHIPS Summary for small ships This is a summary of the ”Drinking Water - On Board Ships” guidance. You can learn more and look for more background in the actual guidance at: http://www.seahealth.dk/sites/default/files/DRIKKEVAND_UK_0.pdf. The guidance has been issued because there have been changes to Danish legislation on the basis of ILO – MLC 2006: ”It shall be ensured that drinking water on board (for human consumption) is of satisfactory quality and suitable for the purpose. It should be able to document this using regular analyses benchmarked against international standards.” Danish Maritime Authority Notices B of 7/6-2013 Ch.II-3 Rule 20.2 2 Drinking water is defined as: All water either in its original state or after treatment, intended for drinking, cooking, food preparation or other domestic purposes, regardless of its origin and whether it is supplied from a distribution network, from a tanker, or in bottles or containers. Note that this definition also covers water for other domestic purposes, such as personal hygiene – tooth-brushing, showering, etc. EU Directive 98/33 EC of 3 November 1998
  3. 3. SUMMARY FOR SMALL SHIPS About regular analyses If you bunker water of known quality or produce it yourselves, it must be analysed at least once a year – or if you suspect contamination. If you bunker water of unknown quality, it must be analysed every time and you must have the results before using the water. Apart from that, the water must be analysed once a year. If maintenance has to be done on the water system, the water must also be analysed. Satisfactory quality The water must comply with various threshold values for micro-organisms and other contaminants. Most of the threshold values are European but there are also a few WHO and Danish threshold values. On page 6 of the guidance, you can see what water is to be controlled for, and in Annex 1 of the guidance the various threshold values are listed. Sampling Samples should be taken for analysis at an accredited laboratory. But if you have the right equipment and skills on board, you can do it yourselves. Page 8 of the guidance gives more details of this. DRINKING WATER – ON BOARD SHIPS If the threshold value for E-coli has been exceeded, you must immediately boil water before use. Furthermore, you could obtain bottled water at the next port of call. If you do not immediately know the source of contamination and cannot stop it, contact Seahealth for assistance. If there are other nonconformities, contact Seahealth in the first instance for further assistance before starting on various actions. Contamination of drinking water can have major cost implications, both financially and for the health of the crew. That is why it is important to prevent contamination. Guide to prevention There should be a plan on board for ensuring you have clean drinking water for the crew. This means: • How will you do a risk assessment of the complete drinking water supply system to identify risks, critical control points and assessment? • How will you ensure you have constant operational monitoring? • What actions should you take if the water quality or water system is not in order? Here is a guide for just such a plan. Remember this is a general list. So you will need to modify the plan to match the specific conditions on your ship where other factors may apply. The points can be included in the system and routines you already have. You do not need to have a separate plan. If analysis results exceed threshold values, you must take action. 3
  4. 4. GUIDE TO PREVENTION System 1. Take a copy of the drawing of the drinking water system from the ship’s manual. 2. On the drawing, circle where contamination can occur. This might be filters or tank breather vents. That is, places where the system can be or is open. 3. Decide how you will prevent water from being contaminated by the various sources of contamination. This might for example be ensuring that the filter is clean before insertion, that the breather vent has a finely meshed screen, that the fresh water generator has been cleaned and other programmed maintenance has been undertaken. 4. Decide whether some of these places should be regularly controlled or whether you will do it as a part of routine maintenance. Include the points in the maintenance system and check/inspection lists that you already have. 5. Where possible, drinking water tanks must be opened up, emptied, ventilated and inspected at intervals not exceeding 12 months. Additional water treatment 1. Register the additives you use in the water and determine the correct amount of additives to be used. Do so on the basis of the manufacturer’s directions in the safety data sheet and enter the details in to the inspection list. 2. Decide and write down where you will take on seawater for fresh water production - are there any special criteria you will establish on board? Get this included in standing orders or the company’s SMS. 3. When bunkering, consider which ports of call have water of a satisfactory quality and how you can check the quality subsequently. Operations 1. Check the taste, smell and clarity of water when you drink it. 2. Describe what to do if it is felt that taste, smell or clarity are not right, and consider inclusion in the company’s SMS. 3. Check that hot water is maintained at 60°C at the heat exchanger (it prevents Legionella bacteria). Include on your inspection list. 4. On the ship’s maintenance system or the company’s SMS, enter the tests that are to be taken on drinking water in accordance with the guidance. 5. If you have cabins on board that you rarely use, be aware of the potential for Legionella. So establish a routine requiring showers and water taps to be flushed before use. 6. When you get results from drinking water analyses, keep them on board. Scan them or keep them on file. Check the values and compare them with the values in Annex 1 in the main guidance. If water is contaminated Make a plan for what to do with water which is contaminated. Should water be boiled? Will you supplement with bottled water? Do you for example have chlorine on board to decontaminate the system? Get it included in the company’s SMS. Seahealth Denmark · Amaliegade 33B, 2 · DK-1256 Copenhagen K · www.seahealth.dk