Ahydrocarbon gas processing vessel is depressurised through a blowdown valve to the flare system. describe the purpose of a blowdown system. if there was a power system failure on a process plant, what would be the failsafe position for a blowdown valve?

Water in a partially filled large tank is to be supplied to the roof top, which is 8 m above the water level in the tank, through a 2.2-cm-internal-diameter pipe by maintaining a constant air pressure of 300 kpa (gage) in the tank. if the head loss in the piping is 2 m of water, determine the discharge rate of the supply of water to the roof top in liters per second.