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: maximum value of ratio between the applied shear stress and rate of shear of a liquid at design temperature it is sometimes referred to as the coefficient of dynamic viscosity, or simply viscosity, thus dynamic viscosity is a measure of the resistance to flow or deformation of a liquid; Name: maximum dynamic viscosity at design temperature