Centrifugal Pumps Design and Application 2nd ed - Val S. Lobanoff, Robert R. Ross (Butterworth-Heinemann, 1992)

352 Centrifugal Pumps: Design and Application
T Torque (Ib-in.)
r Radius of shaft (in.)
J Polar area moment of inertia (in. 4 )
P Power (ft-lb/sec)
w Angular velocity (rad./sec)
D
(with or
without
subscript) Diameter of shaft as indicated (in.)
N Speed (RPM)
M Bending moment due to radial hydraulic load (in.-lb)
1
(with or
without
subscript) Moment of inertia of shaft as indicated (in. 4 ) = ___ wD 4
Se Endurance limit of mechanical element (psi)
S'e Endurance limit of rotating beam specimen (psi)
Ka Surface finish factor
Kc Reliability factor
Ke Stress concentration factor
A Area of shaft cross section (sq in.)
W Impeller weight plus radial thrust (Ib)
E Modulus of elasticity of shaft (psi)
A 2 Distance from centeriine of impeller to centerline of
inboard bearing (in.)
B Bearing span centerline to centerline (in.)
X Distance from centerline of impeller to location on shaft
where deflection is to be calculated (in.)
bhp Brake horsepower
AI Key shear area (sq in.)
Y Deflection at any point on shaft (in.)
F Force (Ib)
L Useful key length (in.)
Wj Key width (in.)
Axial Thrust
A
(with
subscript)
Area of cross section as indicated by subscript (sq in.)
= irD 2 /4.