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  1. House888

    Re-circulation line for pump set - How to reject the heat?

    There is no re-circulation system present at the moment. I am adding this re-circulation line to what is effectively an off the shelf solution, which has a control system and pressure relief systems, which i have inherited but before it has been fully installed. I will need to ensure integration...
  2. House888

    Re-circulation line for pump set - How to reject the heat?

    So is it all of the shaft power that needs to be accounted for, 125kW? OR only the inefficiency that makes heat? Say 30% of 125k = 37.5kW? If so, where does this pressure go, can I just dissipate it somehow? Like a outlet spray nozzle into a tank. If this was in steady state, wouldn't the...
  3. House888

    Re-circulation line for pump set - How to reject the heat?

    Yes, you've got it. There is no throttle valve at present, i agree this could be added to improve the validity of the full system test, thanks for this suggestion. The problem comes from the small volume of the re-circulation system, the closed loop, option 2, pumping round and round. How to...
  4. House888

    Re-circulation line for pump set - How to reject the heat?

    There are two types of test, once a year a full system test with the water coming from the inlet, and would bypass the re-circulation system and go straight to drain. This would be equivalent of test Option 1. There is no back pressure that would usually be present if the system was operating in...
  5. House888

    Re-circulation line for pump set - How to reject the heat?

    There is no re-circulation line at present, it would just go to drain. The total circuit for the drain line so far is approx 10 meters which is around 10 litres volume. Just adding a re-circulation line without tank would be again, 10 meters, around 10 litres volume, total of 20 litres. The...
  6. House888

    Re-circulation line for pump set - How to reject the heat?

    Hello all, I am adding a system to recirculate the flow of an emergency pumping system. Fluid: Water Flow rate: 750L/min Pressure: 100 Bar Test time: 4 mins 5 off positive displacement piston pumps, driven by 25kW motors. In operation the fluid would just go to drain. However, the system...

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