You have a two stage centrifugal pump, with both stages in parallel configuration. After dismantling the pump you realize that you forgot the marking and both impellers are identical. Both the impellers are single entry type and the eye of both the impellers will come in the opposite direction. What are you going to do?

A. Since marking was forgotten, so we need not worry, any impeller can come in any place as they are identical
B. Any impeller can come in any place, but the phase sequence of the electrical motor driving the pump may have to be reversed, if impellers have exchanged places
C. You have to find out the right placement of the right impeller with respect to the direction of rotation or by looking at the volute casing
D. Hit an trial method will have to used to find out the correct placement method by assembling the pump and trying it out

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