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HI Gents Thanks for the input. I become more enlightened each day a i read this forum.

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

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

i work out 23 ft/s??

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.

Its a centrifugal pump

Hi the design duty was 1.9 l/s@ 70 kpa. The actual site measuremnts are 1.51 l/s@ 65 kpa and drawing 1.9 amps regards

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...

thanks for the input, as usual good informative posts

thanks i will base the flow on a fluid velocity suitable for the pipe size

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...

Hi Pumps are centrifugal domestic circulators. First pump is internal to the boiler and the second is in series after the boiler. The second pump is on a seperate timer for the hot water. The boiler pump is set to run on for 20 seconds to take heat away from the boiler but when this happens...

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?

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...

Why do you want to fit an 11Kw motor - do you want the pump to produce less flow or head and thought this is the way to achieve it? Knowing what you want to achieve will assist with a sensible answer The original motor has gone down and cant get replacement for a few weeks but i have 11kw...

many thanks

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)

thanks

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

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