“Pumping and Hydraulics’ Solutions for Irrigation and Water Supply”
ELECTRIC Pump Data Chart
This chart is suited to electrically driven pumps only and enables the operator to quickly determine pump operating costs in $/ML given operating head (metres), assumed pump efficiency and electricity tariff in c/kWh. The chart is based upon an electric motor efficiency of 93%.

Interestingly, the flow rate pumped is not required for establishing $/ML.

The chart can also be used in reverse to establish volume pumped given pumped head (metres), pump efficiency and known KWH consumption from Electrical Utility invoice.

Rob devised the Pump Data Chart during an investigation into pumping costs for a major irrigation project in the late 1980's.

Download a PDF copy of the ELECTRIC Pump Data Chart
Pump Testing Formula

(and Determining KWH/ML/m, bottom of page)
     
There are 4 basic formulae for testing pumps:

Pump
h = WkW (Water kW) .........................1)
                  MkW (Motor kW)

WkW = 0.00982 x Head(m) x Flow (l/s) ......2)   Reference

KWH/KL = EkW       ......................................3)
                   3.6 x l/s

Motor
h   = MkW ...........................................4)
                    EkW


From these formulae, we can derive some other useful formulae:

From 4),   EkW = MkW    .....................................4a)
                               motor
h

Substitute 4a) into 3)
       
\KWH/KL = MkW                        ...................... 5)
                               motor
h x 3.6 x l/s 

From 1)   MkW = WkW    ......................................1a)
                               pump
h

Substitute 1a) into 5),
         KWH/KL = WkW                                       ...........6)
                              pump
h x motor h x 3.6 x l/s

Substitute 2) into 6)
          KWH/KL = 0.00982 x head (m) x l/s
                              pump
h x motor h x 3.6 x l/s

Converting to KWH/ML:
          KWH/ML = 0.00982 x head (m) x l/s x 1000
                               pump
h x motor h x 3.6 x l/s

   ie,   KWH/ML = 2.73 x head (m)  .........................7)
                              pump
h x motor h

             $$/ML  = KWH/ML x $$$/KWH

                           = 2.73 x head (m)   x    $$$     .........8)
                             pump
h x motor h       KWH

               NOTE: Formulae 7) and 8) are used to construct the
                           Pump Data Chart, above


KWH/ML/m  formula
         
(as used by some organisations to define irrigation energy efficiency)

from 7)     
        if KWH/ML=  2.73 x head (m)
                               pump
h x motor h

Then KWH/ML= 2.73 x head (m)                      .
           head (m)   pump
h x motor h x head (m)

                           =            2.73            .
                               pump
h x motor h

A DIESEL Pump Data Chart is also available.
Formula for kWh/Megalitre

= 2.73* x metres head
   motor
h x pump h
Tallemenco Pty Ltd, Windsor Gardens, SOUTH AUSTRALIA, 5087.
ABN: 92 105 345 506
Mobile  0414 492 256
International:   Cell  +61 414 492 256
ABN 92 105 345 506
Last Updated
Oct 16th 2018
American Society of Irrigation Consultants
Full Professional Member 2011
Click here for more information on units for pumping