... Terms of Use as given at the website.Source: HANDBOOK OF MECHANICAL ENGINEERING CALCULATIONS 7.46PLANT AND FACILITIES ENGINEERING 0.392ϩ0.784ϭ138.226 ft (42.1 m), say 140 ft (42.7 m) of water. ... is 80 percent of bep capacity. For a specific speed of 1090, asbefore, the percentages of bep head and efficiency are shown in Figs. 36 and 37:79.5 percent of bep head and percent of bep efficiency. ... r/min. For a specific speed of 1090, the percentages of bep capacity, effi-ciency, and power are 107 percent of the capacity, 94 percent of the efficiency, and108 percent of the bhp. To get the actual...