commercial plumbing regs

[thomas donovan]

are there any specific regulations regarding tmv installations on shower installs that i should be aware of, by my reckoning i could just put one tmv on hot outlet therefore controlling the temps on all showers.
my questionis does every outlet need its own individual tmv?

 

[stani]

Legionella control procedures,

 

[Mike Jackson]

You need to have a read of http://www.hse.gov.uk/pubns/priced/l8.pdf

This is the approved code of practice for the control of legionella bacteria in water systems.

Incorrect installation of TMVs can lead to serious problems. I closed a sports centre down for 2 days a few years ago because incorrect TMV installation had led to the cold water storage tank heating to 37C, the ideal breeding temp for legionella bacteria.

 

[AWheating]

"Thermostatic mixing valves (TMVs) should be sited as close as possible to the point of use. Ideally, a single TMV should not serve multiple tap outlets but, if they are used, the mixed water pipework should be kept as short as possible. Where a single TMV serves multiple shower heads, it is important to ensure that these showers are flushed frequently"

from the link above