OHHHH, Out sourcing, MMMMM.(another kid with no toys')
Still KJAY raises a very good point on the valves. Unless these are centrifugel Pumps, they could have a big problem on changeover. Centrifugel pumps will allow the water to flow without building pressure (similar to the fire pumps, for testing).
Bring this to their attention and avoid a headache. You must think ahead of them, or you WILL be the "Fall Guy".
