Re: Qs re hot-water-system (sudden increase in) PSI&temp.

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Posted by Michael Poppers on March 06, 2001 at 08:01:31:

In Reply to: Re: Qs re hot-water-system (sudden increase in) PSI&temp. posted by Harold Kestenholz - Hydronic Network on March 03, 2001 at 15:33:30:

HKestenholz replied:
: With all the excellent clues you have given,...
Thanks, I tried :-).
: is possible that you have
: localized heating of water to steam inside
: the boiler due to your failing circulator.
It's good to hear that the circulator may be
behind this issue.
: This would cause a rapid temperature and
: pressure jump, luckily not enough to dump
: the water from the system.
A quibble: our jump was sudden (from one
day to the next) -- I can't speak to whether
or not it was rapid. Having jumped (as
described in my original posting), both the
temp. and the PSI have stayed within the
new range.
: The pressure should not exceed 25 psig on
: a 30 psig relief valve as this is the
: resetting pressure once the valve has popped.
10-4. The valve has not "popped" to date,
and, as I implied, the actual PSI is 3-5 PSI
below what the gauge tends to register
(before one taps on the glass :-)), so I
don't think we've actually gone above
30PSI at any point (although we're coming
pretty close!).
: If the system pressure rises above 25 psig
: consistently after your circulator is repaired
: or replaced, get a larger expansion tank...
The gas-company people have noted that we
should have a larger Extrol tank -- however,
actually mounting a larger tank might
be tricky due to the positioning of the
: ...or put another one on a manifold with
: the old one. There are pictures how to
: do this in the free lessons
: at
Is there any way we uneducated homeowners
can calculate our system volume? I'll use
Table 5 in
to determine whether we currently have
an ET9 -- thanks!
: Severely black water can be corrected by
: flushing the system with clean water,
: not chemicals.
Are you suggesting that the blackened water
dripping from the circulator represents
the water in the system? The comments of the
gas-company people imply that the blackness
comes from the used [machine] oil (whose
color when new, as you know, is light brown)
and is nothing to worry about.

Thanks for replying, and advance thanks
for your (or anyone else's) further

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