Legionella / Cold water storage tanks

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Jomell
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Legionella / Cold water storage tanks

Aug 2018 10 06:22

Post by Jomell » Fri, 10th Aug 2018, 6:22am

Post by Jomell by Jomell Aug 2018 10 06:22

At my school we have 2 x cold water storage tanks which are situated in the boiler room and are fed directly from the water mains.

The are both currently reading 23 degrees and have been around this reading for the last 3 months. No wonder we can't get a reading of below 20 degrees at the taps [Scared.png]

I'm guessing this will be a common problem with a lot of other schools?

Apart from regularly flushing through the system, has anybody out there having any suggestions? We are due a Legionella risk assessment at the end of this month.

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trout39843
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Re: Legionella / Cold water storage tanks

Aug 2018 10 06:57

Post by trout39843 » Fri, 10th Aug 2018, 6:57am

Post by trout39843 by trout39843 Aug 2018 10 06:57

I would get a copy of the recent weather temps. and keep it with your readings. Also, you might want to look at insulating the tanks to help keep them cool.
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seanallen
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Re: Legionella / Cold water storage tanks

Aug 2018 10 11:49

Post by seanallen » Fri, 10th Aug 2018, 11:49am

Post by seanallen by seanallen Aug 2018 10 11:49

I'd be pushing for the tanks to be remover and run the taps directly from the mains supply.
Due to the present financial situation, the light at the end of the tunnel has been temporarily switched off.

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adonis2
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Re: Legionella / Cold water storage tanks

Aug 2018 10 20:07

Post by adonis2 » Fri, 10th Aug 2018, 8:07pm

Post by adonis2 by adonis2 Aug 2018 10 20:07

I was having the same problems with the incoming mains temperature, our water treatment company said it was the extreme weather we are having and the water authorities are allowed to supply water up to 25c.

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trout39843
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Re: Legionella / Cold water storage tanks

Aug 2018 12 13:15

Post by trout39843 » Sun, 12th Aug 2018, 1:15pm

Post by trout39843 by trout39843 Aug 2018 12 13:15

seanallen wrote:
Fri, 10th Aug 2018, 11:49am
I'd be pushing for the tanks to be remover and run the taps directly from the mains supply.
It would cost too much to have the tanks removed bro. Hooking the taps up to the mains is simple, but you also have to look at the water heaters and low pressure (heating) systems. Reduced pressure valves would have to be installed and they can be a pain.
"Life is tough, It's tougher if you're stupid." - John Wayne

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SneakyPete69
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Re: Legionella / Cold water storage tanks

Sep 2018 17 16:41

Post by SneakyPete69 » Mon, 17th Sep 2018, 4:41pm

Post by SneakyPete69 by SneakyPete69 Sep 2018 17 16:41

We were advised to fit smaller tanks for more rapid flow through.

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adonis
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Re: Legionella / Cold water storage tanks

Sep 2018 18 07:50

Post by adonis » Tue, 18th Sep 2018, 7:50am

Post by adonis by adonis Sep 2018 18 07:50

done away with ours a few years ago. They were insulated, no water heaters to worry about, and a plumber just bypassed the tank so all outlets are now mains fed (certificate issued). Tanks are still in situ as they are to big and expensive to remove.
Don't let the school tell you what your entitled to. Check it out and tell them.

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Jubbs
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Re: Legionella / Cold water storage tanks

Sep 2018 18 08:33

Post by Jubbs » Tue, 18th Sep 2018, 8:33am

Post by Jubbs by Jubbs Sep 2018 18 08:33

Be very careful before hooking up to the mains supply. There is a reason to have storage tanks, they do not impede the water pressure especially when everyone flushes a toilet and you can have no pressure upstairs which then sucks air in if a tap is used in a sink there.

It also reduces the overall pressure throughout the building.

Wherever possible I would encourage the use of storage tanks, the hassle of balancing cisterns, pressure tanks or having no water supply at some outlets is not worth decommissioning them.

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EBJ
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Re: Legionella / Cold water storage tanks

Sep 2018 18 11:51

Post by EBJ » Tue, 18th Sep 2018, 11:51am

Post by EBJ by EBJ Sep 2018 18 11:51

Jubbs wrote:
Tue, 18th Sep 2018, 8:33am
Be very careful before hooking up to the mains supply. There is a reason to have storage tanks, they do not impede the water pressure especially when everyone flushes a toilet and you can have no pressure upstairs which then sucks air in if a tap is used in a sink there.

It also reduces the overall pressure throughout the building.

Wherever possible I would encourage the use of storage tanks, the hassle of balancing cisterns, pressure tanks or having no water supply at some outlets is not worth decommissioning them.
Agree with Jubbs on this subject and i did discuss this once with our company that managed all our water tanks, tvr's and general water taps ect and he said we were OK as we were and especially as they cleaned the tanks each year and and added the correct chemicals to the filled water tank with a certificate of cleaning and inspection. [Like.png]
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Nail
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Re: Legionella / Cold water storage tanks

Sep 2018 18 11:52

Post by Nail » Tue, 18th Sep 2018, 11:52am

Post by Nail by Nail Sep 2018 18 11:52

Any chance you've got an issue with your hot water system letting by into the tanks?

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