I need a quick Math Check...

John Barba_6

Can someone please check my math...

I am working on venting a 1 pipe steam system with 58.5' of 2" and 17.8' of 1 1/4" main and am only coming up with 1.52 ft3 of air to vent. It seems low to me.

Here is how I am calculating it...

(58.5 x .023) + (17.8 x .01) = 1.3455 + .178 = 1.5235

Thanks.

Jeff

Bob D._2

Volume check

Close enough. Depends on your materials & fittings, but STD weight steel pipe works out to 1.55 cu. ft. (give or take).

Brad White_203

I get

1.54817 cubic feet.


More or less

scott k_3

less

Ok I vote for less. I get 1.427 ft^3. I assumed the diameter is ID (conservative) and assumed at atmospheric pressure. here's the math:

vol=(pi)*radius^2*length soooooo for the 2"
(3.14159)*0.0833^2*58.5=1.275ft^3

for the 1.25"
(3.14159)*0.05208^2*17.8'=0.152 ft^3

for a grand total of 1.427 (actually less as there is wall thickness.)

Bill_111

Correct

1.4266 Cu. Ft.