فرمولهای محاسبات آبرسانی و پمپاژ
7 رای3.65- توضیحات
- دسته: پمپ
- بازدید: 3223
GPM = gallons per minute
CFS = cubic feet per second
Lb. = pounds
Hr. = hours
BBL = barrel (42 gallons)
Sp.Gr. = specific gravity
H = head in feet
psi = pounds per square inch
In. Hg. = inches of mercury
hv = velocity head in feet
V = velocity in feet per second
g = 32.16 ft/sec2 (acceleration of gravity)
A = area in square inches
I.D. = inside diameter in inches
BHP = brake horsepower
Eff. = pump efficiency expressed as a decimal
Ns = specific speed
N = speed in revolutions per minute
v = peripheral velocity of an impeller in feet per second
D = Impeller in inches
Nc = critical speed
f = shaft deflection in inches
P = total force in pounds
L = bearing span in inches
m = constant usually between 48 and 75 for pump shafts
E = modules of elasticity, psi - 27 to 30 million for steel
منبع:مکانیک سیالات و تاسیسات تهویه مطبوع