piping layout

[svp]

i have to design a pipe layout whose total mass flow rate is 221kg/s.
1st 221kg/s flow in a single pipe and it divide into two pipe with mass flow rate is 110.5kg/s. then it goes into big header of 300mm diameter.from this 9 pipes of 2" dia (rectangular arry)with flow 12.77778kg/s & velocity 7m/s.
also suggest some software of piping desun

 

[Doug41]

What is it you a moving, water? why the split into two pipes and then back together again?