I realy dont know what your trying to do.
My opinion to your work will be...
Try evaluating your pump case in operating(As indicated in the code or contract), instalation and ambient. Think of things that are posible to happen... Usually you can reduce your case in visual judgement,like if higher temperature help to mess your pump or low temperature will do.

Study this one. This will realy help you...

Regards! Mabuhay!