how much does size matter in feet?
PSI and Fahrenheit not working on my furnace gauge. the only needle that moves right now is marked Ft. Now I am trying to find a new gauge but can someone please explain the whole feet thing to me. its been about 30 years since i went to vocation school for hydronics so the details have been forgotten
Comments
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Feet x .433 = psi
8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour
Two btu per sq ft for degree difference for a slab0 -
OK. I did come across that information but how is that useful info to me?
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What feet is the needle pointing to? Multiply that number of feet by .433 to arrive at pressure.
8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour
Two btu per sq ft for degree difference for a slab0 -
it is measuring pressure in feet water column instead of pounds per square inch. it was mainly used to tell when the system was filled up to an open expansion tank.
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Right now it says 20.
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8.6 psig
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An easy rule of thumb that you can always remember (although not perfectly accurate but usually close enough is) 2'=1psi
so your 20' simplified is 10psi
The correct way is .433 x20=8.66 psi
or 2.31feet/psi=20/2.31=8.65psi
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Ok. The strange thing is i do have a open expansion tank that is mounted in the ceiling above the furnace. My guess is about eight feet from the floor to the tank. 8 times .433 = 3.464. The gauge reads 20.
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open tank or a sealed compression tank with no diaphragm but closed? i don't see how an open tank can be below the emitters.
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Expansion tanks - Structure Tech Home Inspections
I have the old school style open tank. Its not a open air style. Open air type must be above the emitters. The link above gives more detail on that.
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we're missing something here because if an open expansion tank is below the emitters the water would run out of the tank.
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No. The drain valve on the tank stays closed. Read this link…………
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it showed all 3 styles of expansion tanks, open tanks, compression tanks, and bladder tanks.
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How are you sure that it's an open tank, @scatgo ? I sounds to me like a regular steel compression tank.
Br. Jamie, osb
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
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It is not an open tank it is a bare steel compression tank
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Bingo! My bad. Sorry people total brain fart on my part.
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