Description: lowest permissible head of a pump; Name: smallest head allowed
Description: Minimum permissible head at which the pump can be operated without suffering damage; Name: Minimum allowable head
Description: Speed that characterizes a pump in terms of its speed, flow rate per impeller eye, i.e. total flow for single-flow impeller, half flow for double-flow impeller, at the best efficiency point and head per stage at maximum impeller diameter ; Name: Specific speed