Description: duration of operation between consecutive failures of a functional unit under given conditions; Name: otbf
Description: Operating time between consecutive failures ; Name: Operating time between failures
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