Description: Period of time during which an item performs its intended function, it includes all the time a machine is continuously running from start-up until it is shut down.; Name: ot
Description: passed time period after comissioning of a system, sub-system, component or piping; Name: Operating time 
Description: greatest difference between the total energy height at the outlet side of the pump aggregate and the total energy height of the intake side of the pump aggregate at operating point; Name: maximum feed height