code says a loss of less than 5lbs over 48 hours passes.
plumber installed copper lines. new construction. I would think no
loss would be the case. shouldn't pressure hold constant, say after
the first 24 hours and have no loss what so ever?I am taking in
outside temp, etc, for fluctuation changes but the pressure should be
more than 5lbs even after a 5 day?.
I'll jump into this only because we've designed a couple of testing
systems for manufacturers of water or water/glycol coils and I know a
little about it.
I AM NOT a plumber, so their advice may take precedence.
First off, air is a poor choice for testing a water system. Water
systems act on the premise of hydraulic pressure, while air acts on
The two are distinctly different animals, and the systems designed to
carry them are, too.
Water is much denser than air, so it takes less pressure to achieve the
equal mass. Domestic water piping systems, unless specifically designed
for the purpose, don't see near the pressure a pneumatic system would.
Thus, if you pressure tested with anything above about 5 psi, a whole
bunch of valves, regulators, and joints might be damaged. Hydraulic
(water) testing is the common and most acceptable method for your
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