A Discussion on Several Questions in Water Supply and Sewerage Works

Based on the relevant items in the code for water supply and sewerage,and taking into account the rate of flow and the loss of water head,the author proposes,when selecting a flowmeter,the maximum rate of the rotary vane meter be double the nominal flow rate,and the maximum rate of the spiral vane flowmeter be equal to the designed flow rate per second.With reference to the volume of a fire fighting water pool,how much water can be supplied from outer systems should be considered besides the duration of a fire.The fire fighting outlet non return valve ought to be at least two meters lower than the siphon pipe neck of the domestic outlet,and the bottom of the air compensator to be some distance above the highest water level in the water tank.