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: norm describing the material. The material number is taken from this norm. Type and number of the norm with issue year and issue month must be given; Name: Reference norm material of the shaft