CENTRIFUGAL-PUMP.ORG
Engineering Calculations


This section deals with typical engineering calculations that are intended as
references for making general estimates only. Since every situation is unique and
requires other specific factors to  be considered to make accurate calculations
depending on their intended use, CENTRIFUGAL-PUMP.ORG do not warrant the
accuracies of these calculations, and disclaim any liability for their use.

Sample calculations are available by request since they are of interest to a select
group of readers only.


Partial list of engineering calculations:

  • acoustic frequency
  • acoustic resonance
  • affinity laws
  • axial hydraulic thrust (horizontal)
  • axial hydraulic thrust (vertical - upthrust and downthrust)
  • balance diameter of balance drum
  • ball bearing life
  • ball bearing resonant frequencies (fundamental train frequency, inner race
    ball frequency, outer race ball frequency, ball spin frequency)
  • barrel thickness
  • baseplate analysis
  • bearing loads
  • bolt stretch analysis
  • bolting stress
  • capscrew sizing
  • case hoop stress
  • case stiffness
  • center of gravity
  • coast down speed
  • concrete foundation thickness
  • cover thickness
  • critical speed
  • D^3/L^4 (see shaft flexibilty factor)
  • deflection
  • foot sizing calculations
  • forces and moments
  • foundation bolt tensile stress analysis
  • head loss across orifice
  • head loss across wear rings or bushings
  • horsepower (hydraulic, water, brake horsepower, viscous)
  • hydro-pneumatic tank sizing
  • hydrostatic test pressure
  • impeller balance hole diameter
  • impeller wear ring diameter
  • incipient cavitation NPSHR
  • key shearing and bearing stress
  • lateral analysis
  • leakage flow across wear rings or bushings
  • liquid hammer (see water hammer)
  • lubrication requirement for forced-feed lube system
  • maximum allowable working pressure (MAWP)
  • mechanical seal flush
  • mechanical seal pressure calculation
  • minimum continuous stable flow
  • minimum pump speed
  • moment of inertia
  • momentum thrust
  • noise level
  • NPSHA
  • NPSHR (40,000 hours life)
  • orifice sizing
  • pedestal thickness
  • peripheral speed
  • radial hydraulic thrust
  • relief valve sizing
  • seismic analysis
  • set screw shearing stress
  • shaft deflection
  • shaft flexibility factor
  • shaft torsional stress
  • shockless entrance flow
  • specific speed
  • suction specific speed
  • suction splitter natural frequency
  • temperature rise of liquid
  • thermal minimum flow
  • time allowable to operate pump at shut-off
  • torque
  • torsional analysis
  • velocity
  • velocity head
  • water hammer
  • WR^2


R: 0110-ENCA
C: library
F: calculations


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