XXVI. J. DAVIS. 



Ejector station No. 1 is at the intersection of Pelham and 

 Cross Streets ; No. 2 at the corner of Cross and Bay Streets ; 

 No. 3 in William Street, near Double Bay; and No. 4 on the 

 Marine Parade, near Ocean Street. 



At each station the Shone's Hydro-pneumatic Ejectors are in 

 duplicate, one ejector being ample to deal with the maximum 

 sewage flow, while the pair working together are capable of 

 discharging the maximum combined flow of rainfall and sewage. 



At stations Nos. 1, 3, and 4 the ejectors are each 50 gallons 

 capacity, and at station No. 2, 150 gallons. 



The ejector stations and collecting wells alongside are of cast 

 iron. The collecting wells are 4 ft. diameter, of J in. metal, and 

 receive the sewage from the different collecting sewers. The 

 ejector chambers are 10 ft. diameter, except No. 2, which is 12 

 ft. They are constructed of cast iron segmental plates 1 in. 

 thick, bolted together through vertical and horizontal flanges, 

 strengthened by gussets. The bottom section is strengthened 

 by cross girders of H section bolted to a wider flange running 

 round the cylinder 12 in. from the bottom. 



After the cylinders were sunk to the required depth, the 

 bottom was filled in with concrete between the H girders. To 

 these the ejectors are secured. 



The upper portion of the chamber, being above the water level, 

 is composed of concrete which sits on the top flange of the 

 cylinder. It is built with a decreasing diameter finishing at 4 ft. 

 6 in. at the surface. This allows sufficient room to remove the 

 ejectors if required for repairs. The opening is closed with a cast 

 iron manhole door. 



Ventilating shafts are provided Dear each collecting well to 

 carry off the sewer gas. The ventilation at these shafts is 

 materially assisted by the discharge of the exhaust air from the 

 ejectors through a nozzle into the shafts. 



The air and delivery mains are of cast iron, the Normandy 

 joint being used in the air mains, and ordinary spigot and faucet 

 in the delivery mains. The Normandy joints have proved to be 

 highly satisfactory, no leaks were discovered when these mains 



