Full Description HI 20.3 presents a simplified method to predict normally attainable efficiency levels at the best efficiency point for selected types of rotodynamic pumps when the rate of flow, total head per stage, net positive suction head available (NPSHA), and the service conditions are known. The standard provides guidelines on the following pump types:Slurry, end suctionSolids-handling, end suction pumpsSubmersible sewage, end suctionPaper stock, end suctionHorizontal multistage, axial split, segmented ring diffuser barrelASME B73, API end suction, end suction - smallEnd suction - large (greater than 0.3 m3/s [5000 gpm]) - Does not include sealless, self priming, or pumps included aboveAPI double suctionDouble suction, general serviceVertical turbine, mixed-flow and propeller, single and multistage diffuser type