Rank: Forum user 
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Hi All
We have a private water supply and associated treatment systems. The system does not have enough head to maintain water pressure so the water is pumped. This involves a pressure vessel of 300 ltrs operating at 2 - 3 Bar. Do we need a thorough examination? A quick look through the BIS guidance document left me flummoxed!
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Rank: Forum user
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Ian,
We have had something similiar installed at our site and like you i was not sure and unable to clarify,however if you contact your insurers they would be able to advise as they are the people at my Local Authority who send the competant one to examine it.
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Rank: Super forum user
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Not if just water, at low temperature
the definition of a relevant fluid is:
“relevant fluid” means -
(a) steam;
(b) any fluid or mixture of fluids which is at a pressure greater than 0.5 bar above atmospheric pressure, and which fluid or mixture of fluids is -
(i)
a gas, or
(ii)
a liquid which would have a vapour pressure greater than 0.5 bar
above atmospheric pressure when in equilibrium with its vapour at either the actual temperature of the liquid or 17.5 degrees Celsius; or
(c) a gas dissolved under pressure in a solvent contained in a porous
substance at ambient temperature and which could be released from the solvent without the application of heat;
Read HSE document L122 Safety of pressure systems Approved Code of Practice
ISBN 978 0 7176 1767 8
Free to download from the HSE website.
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Rank: Forum user
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Thanks JJ
I had taken a look at the ACOP and had tried to determine if water was a relevant fluid - hence my confusion! Your first sentence is good enough for me.
Ian
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