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Conversion Formulae

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Hydraulic Pump Formulae


Actual Pump Delivery (lpm) = Volumetric Efficiency (max of 100%) x Displ.per Rev. (lpm) x Pump Speed (RPM)


Pump Input Power (kW) =  Pressure (bar) x Flow (lpm)
                                                  600 x Efficiency (%)

 

 

Conversion Factors

LENGTH


Multiply 
By To obtain

inch 25.4 millimetres (mm)

inch 0.0254 metres (m)

foot 0.3048 metres (m)

yards 0.9144 metres (m)

mile 1.61 kilometres (km)

 

 







MASS (WEIGHT)


Multiply By To obtain

ounce 28.35 grams (gms)

pound 0.454 kilograms (kg)

ton (long) 2240 lbs  
1,016.05 kilograms (kg)

ton (short)2000 lbs 907.18 kilograms (kg)

tonne 1,000 kilograms (kg)

 

 

 

 




VOLUME


Multiply By To obtain

gallon (Imp.) 
4.55 litres (l)

gallon (US) 3.785 litres (l)

cubic inch 16.38 cubic centimetres (cm3)

cubic inch 16.38 millilitres (ml)

cubic foot 0.0283 cubic metres (m3)

cubic foot 28.3 litres (l)

 

 

 







PRESSURE


Multiply
By To obtain

lbs/sq.in. (psi) 0.069 bar

lbs/sq.in. (psi) 6.9 kiloPascals (kPa)

atmosphere (atm) 1.013 bar

kg/sq.cm 98.1 kiloPascals (kPa)

bar 100 kiloPascals (kPa)

megaPascal (MPa) 10 bar

inch mercury (Hg) 3.387 kiloPascals (kPa)

foot water (H2O) 2.99 kiloPascals (kPa)

 

 

 

 








POWER & TORQUE


Multiply By To obtain

horsepower (hp) 0.7457 kilowatts (kW)

foot lbs (lbf/ft) 1.356 Newton metres (Nm)

inch lbs (lbf/in) 0.113 Newton metres (Nm)

 

 

 



FLOW


Multiply
By To obtain

gal/min (Imp) 4.55 litres / min (lpm)

gal/min (US) 3.785 litres / min (lpm)

std.cu.ft./min (air) 0.472 litres / sec (l/sec)