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Author:
pbr2424 (NH)
I was wondering about a what if situation. If you had heating main in a commercial biulding that were 200 feet long with 2 inch black iron pipe and someone added twelve 90's
that were black iron in order to go up and over objects in three places on just the supply plus the return woudn't the added resistance of the fitting throw off the engineers calculations for the pipe sizing plus the idea of air being caught in the system. I would think that going up and over objects three times with 90's would change what an engineer would of had in mind. Appreciate any help.
Thank you
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Author:
hj (AZ)
IN most heating systems the velocity is maintained at a low gpm so that would not compromise the calculations, UNLESS they were right on the cusp of the flow rate. Air, however is a different story, because that same slow flow may not be enough to push air out of any elevated area.In fact, the slow flow would have a tendency to "drop" any entrained air at a high spot in the piping.
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Author:
pbr2424 (NH)
How would you eliminate the air. With an auto vent on the top 90's or avoid the situation with 90's use 45's. and still use venting. Have the engineer sign off would be best on whatever is used.
Thank you
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Author:
hj (AZ)
A high spot WILL collect air, regardless of whether it was made with 90s or 45s. A tee in place of one of the elbows at each high spot would be a place for an air vent.
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Author:
pbr2424 (NH)
Appreciate your response. Will have to look into it some more.
Thank you
Edited 1 times.
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