In my experience cost over runs start with the design engineers proposal for design cost. In the desire to land the job the project manager or principal reduces the cost estimate of the engineer that did the work up. Second was lack of coordination between design disciplines. For example as soon...
Draw a parallel pump curve using actual or proposed single pump curves. Calculate the actual or design system curve and plot it on the parallel pump curve. If pumps are not the same design you can't draw a parallel curve which tells you don't operate them at the same time. Some pump selections...
It sounds like you have continuous varying flow conditions. Aside from expensive controls an atmospheric surge if installation permits would solve your problem. The rail cars drain into the surge tank and when the car is empty no air enters the pump suction because the pump is drawing from the...
The easiest way to solve your problem is to install a motor operator on the isolation valve near the pump and one on the isolation valve near where you show the foot valve. On shut down delay the pump shut down until both valves are closed. On start up start the pump and then open the valves. I...
