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Formulas Air Velocity in a Pipe Using the equation and typical values of V, D and L explained to the right approximate values of P are computed as follows: Velocity Pipe Diameter in Inches, 10' long Ft/Sec V = 25,000 DP 1 2 4 6 10 L 1 .0004 .0002 .0001 .00007 .00004 V 2 .0016 .0008 .0004 .00030 .00016 5 .0100 .0050 .0025 .00170 .0010 V = air velocity in feet per second 10 .0400 .0200 .0100 .00670 .0040 D = pipe inside diameter in inches 15 .0900 .0450 .0225 .01500 .0090 L = length of pipe in feet 20 .1600 0080 .0400 .02700 .0160 P = pressure loss due to air friction in ounces/square inch 25 .2500 .1250 .0625 .04170 .0250 30 .3600 .1800 .0900 .06000 .0360 formula from B.F.Sturtevant Company Air Volume Discharged from Pipe CFM = air volume in cubic feet per minute V = air velocity in feet per second as determined in the CFM = 60VA equation at the top of this page A = cross section area of pipe in square feet Boyle's Law If temperature is kept constant, the volume of a given mass of Initial Pressure Final Volume gas is inversely proportional to the pressure which is exerted = Final Pressure Initial Volume upon it. Circumference of a Circle If temperature is kept constant, the volume of a given mass of gas is inversely proportional to the pressure which is exerted upon it. Circumference = 2 r = d = 3.14159 d 2 Area = r2 = d = .78539d2 4 Right Cylinder r = radius h = length Volume = r2 h Surface Area = 2 r (r + h) If end planes are parallel but not at 90� to h, the same formulas apply, but a slice at 90� through the cylinder must be used to determine r. DPL108 537 pages518-554.pmd 537 10/5/2007, 10:29 AM
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