“Pumping and Hydraulics’ Solutions for Irrigation and Water Supply”
DIESEL Pump Data Chart
This chart is suited to diesel driven pumps used for irrigation and enables the operator to quickly find pump operating costs in $/ML given operating head (metres), assumed pump efficiency  and diesel cost in $/Litre.

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

This chart is based upon a new 75kW engine at 25 deg C with a Brake Specific Fuel Consumption (BSFC) of 215 gms/kWh (equivalent to 0.25 Litres/kWh**) but no attempt has been made to equate this performance to any particular engine.

Because of the widely varying performance of diesel engines used in irrigation, due to such variables as naturally aspirated, turbo charged, twin turbo charged, varying cooling systems, etc, the actual BSFC of a new engine in the field may vary from 215 gms/kWh. In this case, all derived data in this chart may be re-rated accordingly.

Generally, diesel engines used for irrigation require numerous de-rating factors according to their individual application. In these cases, a percentage adjustment needs to be made to the Litres/ML or $$/ML derived data.

These DERATING factors (in brackets) include;
  for biofuel, add 7% (0.93)
  for gear drive, add 5% (0.95)
  for belt drive, add 10% (0.90)
  for each 25kW below 75kW, add 5% (0.95/25kW)
  for altitude, add 1% per 200m above sea level (0.99/200m)
  for temperature, add 5% for each 10 deg C above 25 deg C (0.95)
  for very old diesel engines, add up to 20% (0.80)

Derating factors are accumulative.
Therefore, multiply all derating factors applying to each site.
Eg, operating at 45 degC plus belt drive, multiply 0.9 and 0.90 = 0.81

Download a full size PDF copy of the Diesel Pump Data Chart


DISCLAIMER
This chart is NOT intended for use as an engine selection tool.
No responsibility will be accepted for any application of this chart.
Formula for Litres/Megalitre

= 0.683* x metres head
   Derating x pump Eff%

Based on BSFC of
       215gm/kWh
       (0.25Litres/kWh)

*NOTE:
0.683 is derived from
2.73 (constant in kWh/ML formula) multiplied by 0.25 Litres/kWh (BSFC)

Ie, 2.73 x 0.25 = 0.683


**NOTE:
   Based upon
   Specific Gravity
   of diesel = 0.86

Ie, 0.215kg/kWh / 0.86    
     = 0.25 Litre/kWh
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