On 2/3/2013 9:11 AM, Ian Malcolm wrote:
"Existential Angst" wrote:

wrote:
Given that a tank has already had some service, what would
you guys do to try to keep the spare tank available for as long
as possible?

Leave it full of water?

Drain it?

My thought was that draining it would be worse, because
allowing air in, it would rust.......



Fill it with water, add a rust inhibitor?


Drain it fully, blow out any remaining water with compressed air, purge
with heated dry air until you get no condensation whatsoever on a chilled
mirror and ideally finally purge with dry nitrogen and seal.

Most rust inhibitors are to some degree toxic so you dont want to use
them in the tank if it will be used for kitchen or bathroom hot water
unless they are specifcally marketed as non-toxic for food processig
plant. If you water-fill it, ideally use boiled water to reduce
dissolved oxygen.

Dissolved oxygen? In H20?


--
Robert Allison
New Braunfels, TX