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: Difference between the total head at the outlet side of the pump and the total head at the inlet side of the pump ; Name: Pump total head