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Posted by Edwin Pawlowski on May 12, 2006, 5:03 pm
show/hide quoted text
> There is no sight
> glass on the boiler, which makes me think it is hot water, but I also
> can't find any expansion tank, which makes me wonder (I've checked all
> closets, attic, etc. - where could it be hidden?). The psi on the
> system is around 15, which also makes me think it is hot water (too
> high for residential steam). The radiators around the house are all
> old cast iron 2-pipe jobs.
> How can I figure this out for sure?
Sounds like water. Residential steam is less than 1# usually, should have a
sight glass, and you'd hear some hammering in the pipes on occasion when it
starts up.
Love those old cast iron radiators. Wish I had them.
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Posted by HeatMan on May 12, 2006, 6:05 pm
show/hide quoted text
> > There is no sight
> > glass on the boiler, which makes me think it is hot water, but I also
> > can't find any expansion tank, which makes me wonder (I've checked all
> > closets, attic, etc. - where could it be hidden?). The psi on the
> > system is around 15, which also makes me think it is hot water (too
> > high for residential steam). The radiators around the house are all
> > old cast iron 2-pipe jobs.
> > How can I figure this out for sure?
> Sounds like water. Residential steam is less than 1# usually, should have
> sight glass, and you'd hear some hammering in the pipes on occasion when
> starts up.
Resi steam _should_ be under one pound. Higher pressure is actually bad in
a steam system
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Posted by mm on May 13, 2006, 12:34 am
On Fri, 12 May 2006 18:05:33 -0400, "HeatMan"
show/hide quoted text
>> > There is no sight
>> > glass on the boiler, which makes me think it is hot water, but I also
>> > can't find any expansion tank, which makes me wonder (I've checked all
>> > closets, attic, etc. - where could it be hidden?). The psi on the
>> > system is around 15, which also makes me think it is hot water (too
I really don't know: Is 15 the operating pressure or the maximum
possible pressure before it explodes?
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Posted by Edwin Pawlowski on May 13, 2006, 1:17 am
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> I really don't know: Is 15 the operating pressure or the maximum
> possible pressure before it explodes?
Low pressure boilers are usually rated at 15 psi steam, 50 psi water. That
is a maximum, not an operating pressure. When you get above 15 psi, it is
considered high pressure and many states require a license to operate. There
should be a relief valve set to the maximum pressure. There should be a
sight glass and low water cutoff float switches.
We have a large four story building at work. We operate at about 5 to 8 psi
and easily move steam hundreds of feet. Residential is usually less than 1
psi. Industrial use can be 100 to 300 psi and steam can be moved long
distances, then reduce for use.
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Posted by HeatMan on May 13, 2006, 2:49 pm
show/hide quoted text
> On Fri, 12 May 2006 18:05:33 -0400, "HeatMan"
> >> > There is no sight
> >> > glass on the boiler, which makes me think it is hot water, but I also
> >> > can't find any expansion tank, which makes me wonder (I've checked
all
show/hide quoted text
> >> > closets, attic, etc. - where could it be hidden?). The psi on the
> >> > system is around 15, which also makes me think it is hot water (too
> I really don't know: Is 15 the operating pressure or the maximum
> possible pressure before it explodes?
Boilers are tested at (I think) 4 to 5 times operating pressure as the max
pressure. Otherwise Edwin is correct.
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> glass on the boiler, which makes me think it is hot water, but I also
> can't find any expansion tank, which makes me wonder (I've checked all
> closets, attic, etc. - where could it be hidden?). The psi on the
> system is around 15, which also makes me think it is hot water (too
> high for residential steam). The radiators around the house are all
> old cast iron 2-pipe jobs.
> How can I figure this out for sure?