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  • Users: cams1975
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  1. cams1975

    Starting of Pumps

    Hi Can you advise if its best to start a pump against a closed valve then gradually open to the fully open postion, or start the pump when the discharge is full open to the system? Whats the pros and cons please
  2. cams1975

    heat lost to atmosphere from pump

    Hi is there a way to calculate the heat lost from a pump to atmosphere Pump data P1 input power 2.34kw P2 output power 1.9Kw pump eff 63.4% Pump and motor eff 51.7% thanks
  3. cams1975

    pump discharge size

    Hi Why would a pump manufacturer design a pump with a 50mm outlet when the pump can generate 14 l/s. If the pump was connected to 50mm pipe then the velocity would be high an cause problems with noise in the pipe. Yes ive asked the manufacturer, but still waiting for an answer.
  4. cams1975

    pump drawing low amps

    Hi Please can you help, i have a 1 ph 240v heating pump. The full load current is 2.7 amps however its only drawing 1.9 amps. I also dont get the correct differential accross the pump, the measured pressure is lower than the design. Please can you advise where is should be looking in order to...
  5. cams1975

    tank to tank transfer

    Hi I have an application where i wish to transfer stored rain water from an under ground tank to another tank up hill. Static lift = 10 meters pipe length = 140 meters Pipe = 1 " diameter. How do i determin the flow rate for the pump? The tank at the top of the hill is to store water to feed...
  6. cams1975

    two pumps inseries

    Hi If a have two pumps in series and the second pump is switched off, will i still get flow from the first pump through the second?
  7. cams1975

    combining flows and pressures at a single point

    If i have 2 seperate pipes combining at one common point in the system what will happen to the flow and pressure at that point i have one pump on one line pumping at say 2l/s@ 2 bar and another pump in the second line pumping at 4l/s @ 1 bar, when the combine at the common point what will the...
  8. cams1975

    changing motor power

    Hi If i change my pump motor from 18.5 kw to 11kw is there a way to calculte the new flow and pressure the pump will deliver( assuming the impellers etc remain the same)
  9. cams1975

    Pump drawing more current than FLC

    Hi I have a waste water Grundfos pump which has a full load current of 18amps. The pump is drawing 30 amps when measured. Can someone point in the direction of possible casuses for the high current drawn. regards
  10. cams1975

    orifice plate sizing

    Hi Sorry if this has been covered before, but can someone advise if there is a formaula i can use to claculate the required size of an orifice plate. Thanks

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