What is the best shaft design for long life for a two stage vertical pump - single shaft, two piece or three piece? Our experience indicated that a two piece design, a standard bowl shaft with a 10" stickup above the bowl, then only one other shaft through the column and through the motor is the best. The manufacture is indicating this is not the "standard" but a bowl shaft with a 10" stickup, a column shaft which sticks up 10" above the stuffing box and a top shaft which goes through the motor. Manufacture concern is when installing the motor over the shaft we will bend the shaft during the installation. We are using a mechanical split seal on pumps.
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