Chemical Contamination and Heat Transfer
Chemical Contamination and Heat Transfer
(OP)
Hi all,
Thanks in advance for any help.
We have a heated water loop that is used as the heat exchange fluid for a kitchen water loop. Currently the heated water loop is treated with a potable chemical treatment chemical even though it never comes into contact with the kitchen water loop water. Hypothetically, if the heat exchanger had an internal leak there could be some contamination between the two loops, which is why the heat exchange fluid is treated with a potable chemical treatment.
My question is: Where can I find the code that requires/describes the requirement for this extra level of protection?
Thanks!
Thanks in advance for any help.
We have a heated water loop that is used as the heat exchange fluid for a kitchen water loop. Currently the heated water loop is treated with a potable chemical treatment chemical even though it never comes into contact with the kitchen water loop water. Hypothetically, if the heat exchanger had an internal leak there could be some contamination between the two loops, which is why the heat exchange fluid is treated with a potable chemical treatment.
My question is: Where can I find the code that requires/describes the requirement for this extra level of protection?
Thanks!





RE: Chemical Contamination and Heat Transfer
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P.E. Metallurgy, Plymouth Tube
RE: Chemical Contamination and Heat Transfer
RE: Chemical Contamination and Heat Transfer
RE: Chemical Contamination and Heat Transfer
RE: Chemical Contamination and Heat Transfer
I am not sure that a system like yours is regulated, but it is good practice.
There is NSF, STFA, FSIS, EHEDG (Europe) and a scad of others.
I don't where coverage of your application falls. The materials (and maybe chemicals) should all have NFS listing at least, so I would start there.
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P.E. Metallurgy, Plymouth Tube
RE: Chemical Contamination and Heat Transfer
a) Inferior materials of construction that result in corrosion - this can be due to general corrosion or galvanic( dissimilar materials welded or fitted together) or localised pitting corrosion
b)Poor segregation of the fluids on either side - this can be due to simple roller expanded tube to tube sheet joints on a S/T type, or some types of plate frame HX also that can result in cross migration of fluids to to internal mechanical failure.
RE: Chemical Contamination and Heat Transfer
RE: Chemical Contamination and Heat Transfer
Regards
StoneCold
RE: Chemical Contamination and Heat Transfer
RE: Chemical Contamination and Heat Transfer
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RE: Chemical Contamination and Heat Transfer
RE: Chemical Contamination and Heat Transfer
Also ask for a nitrogen blanket on the heated water loop expansion drum to keep air - oxygen out.
RE: Chemical Contamination and Heat Transfer
RE: Chemical Contamination and Heat Transfer
But some system to monitor water quality and treatment is needed.
There are a lot of chemicals usable in contact with drinking water, The list is a bit scary.
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P.E. Metallurgy, Plymouth Tube