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: a group of construction elements with the same construction features and the same construction, which can be collated for the construction type approval and quality conformity controls as a result of similar manufacturing methods. they are generally allocated to a construction type specification. Note: in certain cases, construction element from different construction type specifications can be viewed as belonging to the same type and hence collated for the construction type approval and quality conformity controls; Name: Construction type