16.11 A water treatment plant has a flow of 6 MGD (22.7MLD). The plant has 12 identical rapid granular filters operating at a filtration rate of 2 gpm/ft2 (81.4 L/min/m2) and a backwash rate of 30 in./min (762 mm/min). Compute the required capacity of an elevated water tank needed to backwash two filter units at a time. Assume a backwash time of 5 min per filter

Amass of m 1.5 kg of steam is contained in a closed rigid container. initially the pressure and temperature of the steam are: p 1.5 mpa and t 240°c (superheated state), respectively. then the temperature drops to t2= 100°c as the result of heat transfer to the surroundings. determine: a) quality of the steam at the end of the process, b) heat transfer with the surroundings. for: p1.5 mpa and t 240°c: enthalpy of superheated vapour is 2900 kj/kg, specific volume of superheated vapour is 0. 1483 m/kg, while for t 100°c: enthalpy of saturated liquid water is 419kj/kg, specific volume of saturated liquid water is 0.001043m/kg, enthalpy of saturated vapour is 2676 kj/kg, specific volume of saturated vapour is 1.672 m/kg and pressure is 0.1 mpa.

The higher the astm grain size number, the finer the gran is. a)-true b)-false

Wiy doeres rere okhn a pump whon working betwon the same pressure range?