ࡱ> \^[@ jbjb&& 5DD lrrrr   NNNNNbNJ:'''IIIIIII,K NTI '@'''Iwrr+www'"rl Iw6rrrr'Iww jB, Iv ƓNNI.fG2IJJG*YNwYNIw Risks associated with hot water systems Hot water systems can pose a number of health and safety risks. safety reps may find it useful to bear in mind s advice on toilet and related facilities  HYPERLINK "http://www.ucu.org.uk/index.cfm?articleid=2424" www.ucu.org.uk/index.cfm?articleid=2424 Hot water systems supplying basins in toilets are now set above 60oC to kill-off any legionella bacteria that may be present. Water at this temperature can cause scalding, which can affect everyone, although children and older people are most at risk, as their skin tends to be thinner. At the extreme, around 20 people die and over 500 are seriously scalded by water that is too hot every year most of them are old or disabled, but it also includes some children. We are not suggesting that this will happen to staff in colleges and universities when they wash their hands. If nothing else, extremely hot water can burn hands, and certainly makes hand-washing difficult and uncomfortable, and may mean it is less effective in removing bacteria after using the toilet. Legionella bacteria in water systems can be a problem, but its probably true to say that ordinary hot and cold water systems feeding basin taps pose little risk it is more usually water-cooled air conditioning systems that pose the greatest risk and are the systems that almost always cause Legionella outbreaks. Systems with dead legs parts of the system that are closed or rarely used where the water stagnates at or just above room temperature can provide a place where legionella bacteria can grow and develop. This often happens in sprinkler systems, so they should be regularly tested and maintained and some kind of biocide is also useful in controlling bacterial growth. Sometimes legionella bacteria proliferate in the lower section of a calorifier (a hot water tank) below the heating elements where the water can be less than 30C even if water at the top of the unit is above 60C. In this case the installation of a shunt pump is recommended. The secondary flow temperature from the calorifier must exceed 60C and the secondary return must exceed 50C (if applicable) while all associated hot water outlet temperatures must be at least 50C. The HSE have issued an Approved Code of Practice and guidance document (The Control of Legionella Bacteria in Water Systems; L8. ISBN 978-0-7176-1772-2 priced at 8.00, HSE Books) on the control of legionella. Hot water calorifier temperatures must be maintained at 60C or above throughout the entire vessel. Legionella bacteria can not survive for long periods above 50C and will die within a few minutes at 60C or above. However, there are some cases where this outlet temperature is not allowed, such as hospitals and elderly care homes due to scalding. These premises must install thermostatic mixer valves (TMVs) and these should be adjusted to achieve an outlet temperature of around 44C. Cold water outlet temperatures must never exceed 20C. There is nothing to prevent an employer fitting TMVs other than cost. However this would have to be balanced against the costs of a serious scalding should a claim be made against the college, or a prosecution taken by the HSE. If the current method of control is a sign saying Danger hot water then it is unlikely that this will meet the standards of Regulation 4 of the Management of Health & Safety at Work Regulations 1999, which requires the employer to control the hazard at source (i.e. make sure it doesnt become a hazard) Fail-safe TMVs are the only way to do this they prevent the hazard happening. A lesser degree of control would be achieved using mixer taps, but these are capable of being defeated i.e. you can just turn the hot on without the cold, so creating the scald hazard again. The Hot and Cold Water Service section in the HSE L8 booklet (Page 35 onwards) is an absolute mine of information and would, with a little time and effort, enable you to distill a comprehensive checklist to help you undertake a thorough workplace inspection of the water system to ensure it meets the standards in the ACoP and guidance. There should of course be a documented risk assessment relating to water systems together with a water hygiene log book recording temperature testing and maintenance detail of both hot and cold systems. These are documents that safety reps should ask the employer to provide for them to inspect. More information is contained in the HSE guidance. The Thermostatic Mixing Valve Manufacturers Association produces information about TMVs. Check their website for information and useful links  HYPERLINK "http://www.tmva.org.uk" http://www.tmva.org.uk or telephone 0207 793 3008. The Heating and Ventilating Contractors Association also produce professional guidance on specifications. There is a fact-sheet available at  HYPERLINK "http://www.capt.org.uk/FAQ/default.htm" http://www.capt.org.uk/FAQ/default.htm If you have a plumbing section in the college, then you have members who can probably give you a lot of information on this topic as well. Ask your employer to provide you with a copy of the HSE Guidance booklet if you have concerns about the risks associated with scalding tap water as a hazard staff face. It is reasonable for you to have access to it to find out what standards it sets, and will enable you to check your employer is complying with the ACoP standards. They have to either give you a copy, or make access to one available to you. It is assistance you reasonably require, so is covered by Regulation 4A(2) of the Safety Reps Regulations. If they dont produce one, make a formal complaint, and get the Branch to raise it via the JCC (or whatever the appropriate forum with the employer is). Health and safety factsheet 0189:~CDhij-.b¯xn¯Xx¯+j;5B*CJOJQJUmH ph3CJH*OJQJmH #0J5>*B*CJOJQJmH ph3+j5B*CJOJQJUmH ph35B*CJOJQJmH ph3%j5B*CJOJQJUmH ph3CJOJQJmH OJQJmH 5B* CJ(OJQJmH ph3fOJQJ CJOJQJ jUmHjOJQJUmH01;<C D QR F]F^ 4^4` 01;<C D QRIJvwRS PQ12'bcdֻ5B* CJOJQJph3fCJOJQJmH #0J5>*B*CJOJQJmH ph3%j5B*CJOJQJUmH ph3+j&5B*CJOJQJUmH ph3$a$ F]F^ ,1h. 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