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Thanks LittleInch. This has been a lot of help. Just confirming that once Ive determined the new duty point of the existing pump this will now also dictate the required pressure/Head the newly introduced flow will have to meet. As I am likely going to need to design that system next.

Thanks for the response LittleInch! Yes both flows are currently 'fixed' but I would like to find out what the existing pump will now be pumping at since downstream conditions have introduced additional headlosses due to increased flow in 4000 m length of pipe from newly introduced flows up to...

An existing system is made up of a duty standby pumping arrangement that pumps out of a tank with a control volume of 5000 L. Pumping rate is fixed at 50 L/s at 40m head. Existing pressure main is approximately 7000 m in length puming into open tank. A new project is looking to introduce 16 L/s...