Description: Length of time that maintenance is performed on an object, including technical, logistical, and internal administrative delays; Name: time for maintenance 
Description: Time interval when maintenance is carried out on an item including technical, logistic and internal administrative delays; Name: Maintenance time
Description: difference between the total energy height on the outlet side of the pump aggregate and the total energy height of the intake side of the pump aggregate ruling at operating point; Name: nominal feed height