22 third stage 14 has an inlet 26 similarly configured to inlet 24 the present invention in certain instances relates to the configuration of volute scroll 74 and its complementary inlet 22 that configuration can also be used in second stage 12 and third stage 14 within the scope of the invention the first stage 10 has been configured differently than stages 12 and 14 to illustrate the difference between the prior known technique illustrated in stages 12 and 14 from the technique of the present invention exemplified in the first stage 10 it is also different than another known technique as described in fig4 item 90 it should be noted that the invention does not presuppose multiple stages and the details of the first stage 10 can be employed in a single stage installation or in a multi stage installation on one or more of the stages all within the scope of the invention referring again to fig2 shaft 28 has a coupling 30 connected at its end the motor driver not shown is coupled to coupling 30 shaft 28 supports bull gear 32 in gear box 20 pinion gear 34 meshes with gear 32 to drive impeller 36 in first stage 10 shaft 38 supports.