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regarding pump design

So I am having trouble designing pumps 

1) I don't have the system curve for pumps so I am providing the data on how do i utilize it to simulate real field pump

DATA:

PUMP TYPE: centrifugal 

TOTAL HEAD: 50m

DISCHARGE: 100m3/hr

PUMP INPUT: 160.195kw

SIZE:250*300mm

SPEED:1489rpm

the pumping head the plant is giving is 12m into the main pipeline

2) i have 4 working  + 2 standby pumps in parallel

how do i design which pump gets turned on when and 

how do i design them in parallel

please help