I recently turned on the steam boilers in 2 buildings I manage. Both
are Weil McLain steam boilers (EGH-85 and EGH-95). They've been pretty
reliable, but I was just curious. What is the duty cycle for a steam
boiler? Anotherwords, are these boilers designed to run for long
periods of time? Like on an average cold day, is it common for the
boiler to be running lets say 20 minutes on, 30 minutes off?
That's the thing. Even if you test the LWCO, and it works, it could
fail anytime after that. Not good especially since I'm usually at the
buildings only a couple of times a month.
There should be somekind of second backup.
They are pretty reliable. Some boiler setups have two. One will automatic
reset, the other, at a lower level, requires a manual reset.
Not seeing your setup I don't know what you have. The boilers I'm familiar
with have two LWCO and we test them frequently.
The high pressure boilers are tested every shift, by law. You just want to
keep sludge from building up over time, but for heating boilers, that is not
a big concern. Process boilers, much more so.
Mine only has 1 LWCO.However it does have 2 high pressure cutoffs. The
first is set to about 2 lbs and it simply opens the T-stat circuit.
The second cutoff set to about 5lbs and turns out the pilot if
tripped, and must be manually reset and relit.
Whats a process boiler? When I google it, not much info.
A boiler that makes steam to be used for a manufacturing process or
generation of electricity. Usually larger and higher pressure. In steam
terminology, a boiler that puts out 15 psi or more is considered high
pressure and is subject to regulations on controls and operations.
In the state where I work (MA), there must be an engineer in charge (me) and
a fireman present any time the boiler is running. All of my supervisors and
maintenance people are qualified. We use steam to mold foam plastic. One
an average day, we turn 300 to 400 gallons of water per hour into steam.
Since it is used and vented there has to be a lot of water pumped into the
boilers and the evaporated water leaves behind any solids left in it. We
operate at 100 psi. Power plants can run 300 psi.
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