Loan Works.
48
48 B.H.P. when running at a full load speed of 970 revolutions per minute when supplied with 50 cycles, three phase, alternating current at a pressure of 350 volts. The switch gear is of the "Ellison" totally enclosed oil break Rotor and Stator control panel type. The whole of the bye-pass arrangement consists of spigot and socket, cast iron pipes and special castings connected to the 18" steel main at the suction and delivery branches by cast iron collars.
284. Level of ground floor of Pumping Station
15.00 O.D.
Level of Engine Bed...
16.50
Level of Horizontal centre line of Suction
and Delivery Pipes.....
17.70
Level of Horizontal Centre line of Pump
and Motor
18.58
Level of Invert of 18" By Pass main......
13.25
Diameter of Cast Iron Suction Branch...
12 inches
Diameter of Cast Iron Delivery Branch...
10
Diameter of Cast Iron By Pass main............
18
285. Item 9, Filtration Plant.-This work was referred to in paragraph 250 Item 9 of last year's Report. Good progress was made with the construction of the reinforced concrete beds and chemical house which were completed by the end of August. By the end of October the beds had been filled and all piping and machinery, etc. erected. After successful tests the beds were put into operation before the end of the year.
This plant which is of the Paterson Rapid Gravity Type has been erected within one of the old slow sand beds at the Elliot Filter Beds, and has a capacity of four million gallons per day. It consists of an Administration or Chemical House containing the chemical mixing and proportioning plant on the two upper floors and the pumps and compressors on the ground floor whilst the Upper Washwater Tank is carried on the roof. A covered operating gallery in which is situated all the automatic and hand controlling gear runs at right angles to the chemical house. On each side of this gallery is a series of four reinforced concrete rapid gravity filter beds each twenty-four feet by twelve feet under one series of which is situated the Lower Wash-water Tank. Before entering the filters the raw water is treated with Sulphate of Alumina and Lime and after treatment and filtration there is apparatus for sterilization of the filtered water by chlorine and the chloramine process. The filters are cleaned by agitation by compressed air followed by a backwash of filtered water.
286. Normal working level over gauges...
Maximum working level in the beds
Level of Invert of beds....
Level of Invert of pure water channel
299.00 O.D.
295.00
286.00
280.50
19
Loan Works.
48
48 B.H.P. when running at a full load speed of 970 revolutions per minute when supplied with 50 cycles, three phase, alter- nating current at a pressure of 350 volts. The switch gear is of the "Ellison" totally enclosed oil break Rotor and Stator con- trol panel type. The whole of the bye-pass arrangement consists of spigot and socket, cast iron pipes and special castings connect- ed to the 18" steel main at the suction and delivery branches by cast iron collars.
284. Level of ground floor of Pumping Station
15.00 O.D.
Level of Engine Bed...
16.50
Level of Horizontal centre line of Suction
and Delivery Pipes.....
17.70
Level of Horizontal Centre line of Pump
and Moter
18.58
"
13.25
"
Level of Invert of 18" By Pass main...... Diameter of Cast Iron Suction Branch... Diameter of Cast Iron Delivery Branch... Diameter of Cast Iron By Pass main............
12 inches
10
18
"
285. Item 9, Filtration Plant.-This work was referred to in paragraph 250 Item 9 of last year's Report. Good progress was made with the construction of the reinforced concrete beds and chemical house which were completed by the end of August. By the end of October the beds had been filled and all piping and machinery, etc. erected. After successful tests the beds were put into operation before the end of the year.
This plant which is of the Paterson Rapid Gravity Type has been erected within one of the old slow sand beds at the Elliot Filter Beds, and has a capacity of four million gallons per day. It consists of an Administration or Chemical House containing the chemical mixing and proportioning plant on the two upper floors and the pumps and compressors on the ground floor whilst the Upper Washwater Tank is carried on the roof. A covered operating gallery in which is situated all the automatic and hand con- trolling gear runs at right angles to the chemical house. On each side of this gallery is a series of four reinforced concrete rapid gravity filter beds each twenty-four feet by twelve feet under one series of which is situated the Lower Wash-water Tank. Before entering the filters the raw water is treated with Sulphate of Alumina and Lime and after treatment and fil- tration there is apparatus for sterilization of the filtered water by chlorine and the chloramine process. The filters are cleaned by agitation by compressed air followed by a backwash of filtered
water.
286. Normal working level over gauges... Maximum working level in the beds Level of Invert of beds.... Level of Invert of pure water
channel
299.00 O.D.
295.00
J
286.00
"
280.50
19
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