Automatic siphonic apparatus as used in sewerage systems and in sewage purification plants . hole* Bylengthening or shortening this vent pipe within the limit of thedepth of trap, the discharging deptJi may be varied 4 or 5 eitherway, one limit being the maximum depth of water which the maintrap will permit and the other limit a level an inch or soabove the bottom of bell* The first discharging depth in alternat-ing siphons is higher than those succeeding* This is due to thefact that for the first discharge the trap is full and for suc-ceeding discharges it is only half full* This reduces the
Automatic siphonic apparatus as used in sewerage systems and in sewage purification plants . hole* Bylengthening or shortening this vent pipe within the limit of thedepth of trap, the discharging deptJi may be varied 4 or 5 eitherway, one limit being the maximum depth of water which the maintrap will permit and the other limit a level an inch or soabove the bottom of bell* The first discharging depth in alternat-ing siphons is higher than those succeeding* This is due to thefact that for the first discharge the trap is full and for suc-ceeding discharges it is only half full* This reduces the rise inthe bell due to the displacement of the water in the trap, andincreases the rise in the bell due to air comproBsion* But thetotal rise in the bell is less with the trap half full, than whenit is full, and the discharging depth is reduced an amount equalto the difference between the two rises in the bell* In the operation of purification beds it is often foundnecessary to discontinue the use of one of the beds* For thispurpose a system of cut off valves is provided so that any bed. V. so6 ^^^^^
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectsewerage, bookyear190
