In a single casing, multistage pump running at constant speed, the capacity rating is to be slightly lowered. It can be done by_______________?
In a single casing, multistage pump running at constant speed, the capacity rating is to be slightly lowered. It can be done by_______________?
A. designing new impeller
B. trimming the impeller size to the required size by machining
C. not possible
D. some other alterations in the impeller
E. none of the above