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Posted By artisdeeian
Hi Guys!
We have just installed a sprinkler system in our 'Dusty' yard. the water is fed from the mains and held in a storage tank of approximate capacity 10 - 15000 ltrs. it is then pumped under pressure through the pipes to the 'Agricultural' sprayers. We use the system on dry breezy days to obviously 'dampen down' the dust. Although the hazard is very hard to control at source because of our manufacturing processes which have been around for over 50 years, the system is a requirement as advised by the environmental agency. Anyway back to the question; I need to find some sort of adative to control the development of legionnella which we can put into the storage tanks when the system is not in use. any ideas of suppliers of such chemicals?
Regards
Ian.
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Posted By Clare Gabriel
Don't leave it to chance - this is too high risk especially if you have any residential properties nearby.
You will need to do a risk assessment as required by L8. Get in a reputable company to assist you - unless you have training in this -L8 also requires COMPETENCY - which with all due respect if you are asking the question - you may not have the required level.
Ask the HSE and although they will not recommend anyone they will be able to point you in the direction of a reasonable Company - alternatively if you do not want to approach them - if you let us know what area of the country you are in some of the correspondents may be able to assist you.
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Posted By Adrian Watson
The controls are simple; keep the tank clean & chlorinate to 8 ppm.
Regards Adrian
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Posted By Chris Jerman
Doesn't this depend upon the temperature that the water is held at? Mains comes out at about 20 deg C. If it doesn't hang about in there and doesn't approach the temperature for legionella to prosper is there a legionella issue at all? That's part of the assessment, surely? Merely holding and spraying water doesn't automatically mean legionella.
Starting with the assumption that there is, is of course very sensible until proven clear.
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Posted By Carrell
Although I don't really like just saying this...but you do need to do a fuller assessment on likelihood of legionella occurrence in the system. You need to consider deadlegs at the water outlet points (sprinkler heads), is it a "wet" system, i.e. water in pipes to heads all the time or other. It may be that you know all this and have done it but if you don't then a water treatment specialist should be able to help with the assessment as well as provide chemical(s) and other control methods. Just a couple of names I've come across (not sure of locations): Marral, Nalco, Advanced Water Technologies.
If this isn't any help give me a shout and I may be able to put you onto someone who can help with the assessment.
Carrie
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Posted By artisdeeian
Thanks Carrel I will keep you informed. And Yes it is of the 'Wet system'. water remains in the pipework all the way to the sprinkler heads. Although as I said earlier that the system becomes operational when the weather dictates we have to use it. But at some point, again dependant on the weather, especially with the constant rain and damp conditions we have been experiencing, the system remained unused for three to four weeks. And yes we do have some residential buildings nearby. We have had the system in now for approximateley six weeks and as I said before the weather did control its use. I know the best thing is to get a speciallist in, I just thought I would ask the question. Keeps this forum interesting and I look forward to everyones comments and views.
Ian.
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Posted By Adrian Watson
As previously stated the controls are simple keep the tank clean and chlorinated!
The tank will contain legionella and with it not being used for weeks you will get a bio-film. Your pipes are effectively dead legs so they should be kept dry.
Your only means of control is to prevent growth of legionella by limiting temperature (insulate tank) and removing food (i.e. keep clean and chlorinate).
Regards Adrian
Registered Professional Occupational Hygienist.
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