Hydraulic Institute Engineering Data Book |verified| 〈RECOMMENDED〉

| Parameter | Standard Rule | HI Data Book’s Refined Rule | |-----------|---------------|-----------------------------| | Minimum flow for ANSI pumps | 20% of BEP | 30–40% of BEP, adjusted for specific speed | | Suction pipe velocity (water) | <10 ft/s | <6 ft/s if NPSH margin <1.5x required | | Pump start frequency | Not defined | Max starts/hr = 10000 / (D^2 * ΔT) for motor windings | | Efficiency correction for viscosity | HI standard chart | Plus correction for internal bearing drag at low Re |

How does the HI Engineering Data Book stack up against the competition? hydraulic institute engineering data book

: Mechanical engineers, maintenance supervisors, equipment distributors, and system designers. | Parameter | Standard Rule | HI Data