Description: the optimum flow that an object can have at the point of best efficiency; Name: Optimum rate of flow 
Description: Rate of flow at the point of best efficiency; Name: Optimum rate of flow
Description: for objects with preferred utilization positions, the overall dimension that is generally oriented on the gravity and (in general) is measured vertically to the floors from the inlet cross-section through to the pump; Name: Elevation of setting of the machine sets, suction-side