Troubleshooting Low Pump Discharge: Tips to Boost Speed and Output

  • Thread starter Thread starter prasan_y2k
  • Start date Start date
  • Tags Tags
    Discharge Pump
Join the discussion
Ask a follow-up here, or get your own question answered by working scientists, mathematicians and engineers — people, not an autocomplete.
Real named experts · corrections over time · the nuance an AI answer skips
Sign up Log in
1 reply · 2K views
prasan_y2k
Messages
4
Reaction score
0
I have a 12v DC (rotary vane type) pump that is connected to a 12v auxillary battery. The battery is 12vDC 70Ah and it charges itself with the truck's alternator, which is 12 volts, 35 amps. the pump is 1/4 hp, and it draws 20 amps max. The problem is, the discharge output of the pump is very low(8-10lpm), whereas the pump is designed to have a max discharge of upto 57lpm.
What is the reason of low discharge?
Is there any way to increase the speed of the pump so that the discharge rate is increased?
 
Engineering news on Phys.org
Most likely, the low performance is because of excessive voltage drop in the wire. Too thin wires, combined with too long wires. Here is a table you can use to size wire so that the voltage drop is never more than 3%. Look up 20 amps, your required length, and the table gives the required wire gauge.

246358