Page 388 - Centrifugal Pumps 2E

Shaft Design and Axial Thrust 353

D
(with
subscript) Diameter of cross section as indicated by subscript (in.).
P D Differential pressure (psi).
P s Suction pressure (psi).
T Net axial thrust (Ib).
T
(with
subscript) Axial thrust in direction as indicated by subscript. (Ib)
U
(with
subscript) Peripheral velocity at diameter indicated by subscript
(ft/sec) = D X RPM/229.
sp gr Specific gravity.
2
g 32.2 ft/sec (constant used in calculation for Figures 16-14
and 16-16)
3
7 Fluid density of water lb/ft (constant used in calculation
for Figures 16-14 and 16-16.
F x Thrust due to momentum change (Ib)
2
= (Q x sp gr)/A E X 722
Q GPM

References

Peterson, R. E., Stress Concentration Factors, John Wiley and Sons,
Inc., New York, 1974.
Roark, R. J., and Young, W. C., Formula For Stress and Strain, 5th edi-
tion, McGraw-Hill, Inc., 1975.
Shigley, J. E. Mechanical Engineering Design, 3rd edition, McGraw-
Hill, Inc., 1977.