(Home) Skip Navigation LinksPump Hydraulic
/ Visit us on:  Airline Hydraulics - YouTube Airline Hydraulics - Twitter Airline Hydraulics - LinkedIn Airline Hydraulics - Facebook
Products and Solutions to Power Your Ideas
Call Toll Free:1-800-999-SERV(7378)
Skip Navigation Links
About UsExpand About Us
ProductsExpand Products
ServicesExpand Services
CatalogsExpand Catalogs
Place an OrderExpand Place an Order
Training & InformationExpand Training & Information
Contact UsExpand Contact Us
Employee AccessExpand Employee Access
Fluid Power Information Center
Hydraulic Pump Formulas
Formula For: Word Formula: Letter Formula:
PUMP OUTLET FLOW
in Gallons/Minute
FLOW  = RPM x PUMP DISPLACEMENT(Cu. In./Rev.)

231
Q  = nd

231
PUMP INPUT POWER
in Horsepower Required
HORSEPOWER INPUT  = FLOW RATE OUTPUT(GPM) x PRESSURE(PSIG)

1714 x EFFICIENCY(Overall)
HP  = QP

or
1714 Eff
GPM x PSIG

1714 Eff
PUMP EFFICIENCY
OVERALL IN PERCENT
OVERALL EFFICIENCY (%)  = OUTPUT HORSEPOWER

x 100
INPUT HORSEPOWER
EffOV.  = HPOUT

x 100
HPIN
OVERALL EFFICIENCY (%)  = VOLUMETRIC Eff. x MECHANICAL Eff.
EffOV.  = EffVOL x EffMECH
PUMP EFFICIENCY
VOLUMETRIC IN PERCENT
VOLUMETRIC EFFICIENCY (%)  = ACTUAL FLOW RATE OUTPUT(GPM)

x 100
THEORETICAL FLOW RATE OUTPUT(GPM)
EffVOL  = QACT.

x 100
QTHEO.
PUMP EFFICIENCY
MECHANICAL IN PERCENT
MECHANICAL EFFICIENCY (%)  = THEORETICAL TORQUE TO DRIVE

x 100
ACTUAL TORQUE TO DRIVE
EffMECH  = TTHEO.

x 100
TACT.
PUMP DISPLACEMENT
IN CUBIC INCHES/REVOLUTION
DISPLACEMENT  = FLOW RATE(GPM) x 231

PUMP RPM
CIPR  = GPM x 231

RPM
PUMP TORQUE
IN INCH POUNDS
TORQUE  = HORSEPOWER x 63025

RPM
T  = 63025 HP

RPM
PUMP TORQUE
IN INCH POUNDS
TORQUE  = PRESSURE(PSIG) x PUMP DISPLACEMENT(CIPR)

2 x 3.14
T  = PSIG d

2 x 3.14
or T  = Pd

2 x 3.14
PUMP LIFE
B10 BEARING LIFE
B10 HOURS OF BEARING LIFE = RATED LIFE HOURS x RATED SPEED(RPM) x (RATED PRESSURE(PSIG))3


NEW SPEED(RPM) (NEW PRESSURE(PSIG))3
B10 = RATED HRS. x RPMr x (P r)3


RPMn (P n)3
ESOP (Employee Stock Ownership Program) Fluid Power Distributors Association The International Fluid Power Society Association for High Technology Distribution National Fluid Power Association National Association of Safety Professionals