A certain part of a closed loop cooling water systmem has to have some of the pipes made to have a larger diameter to allow more flow. Does this mean though that the overall pressure in the system will drop? I know the headloss in the widened pipe will decrease and flow increase. But will you need to add an additional pump to the system? Also for another cooling water system we have to add a heat echanger which is also connected to another system another system. I take it this will also need a pump to accomodate for the head loss in the pipe and heat exchanger?