560
M
The pumping engine is a compound, horizontal, surface-condensing engine, built by Messers. TANGYE LTD., Birmingham, with cylinders 18 and 25" diameter, stroke 24", nctuating double ram pumps which are arranged for pumping either to the High Level Tanks or to the Peak Service Reservoir as may be desired. 1 he plungers for the former are 75" diameter and for the latter 48" diameter, the capacity of the pumps being 7.5 gallons per revolution when pumping to the High Levels and 2.46 gallons when pumping to the Penk, and the ordinary working speed 40 revolutions per minute. The lift in the case of the High Levels is 438 feet and in the case of the Peak 1,648 feet. The engine commenced to work on the 7th March, and has been found to run smoothly and well.
The boilers are of the Cornish type, 6' 0" in diameter by 24′ 0′′ long, and have a working pressure of 120 lbs. per square inch. They were supplied by Messrs. TANGYE LIMITED.
The main to the Peak Service Reservoir is 4,930 feet in length, the lower half being 5" diameter and the upper half, 6" diameter. It is laid with wrought iron pipes, with screwed socket joints. The pipes supplied have not been so satisfactory as those forming the older mains, 3" in diameter, laid in 1891 and 1901 respectively, and bursts have been somewhat frequent,
The total expenditure on the works has been $65,267.95.
71. Tytam Tuk Scheme.-Fair progress was made with the various works comprised in this scheme considering the difficulties experience on account of sickness among the workmen.
(i.) Dam.-The depositing of concrete was begun in January and by the end of the year the dam had reached a level of 155 feet above Ordnance Datum, the lowest part of the foundations being 93 feet and overflow level 200 feet above the datum mentioned. In all, 15,300 cubic yards of cement concrete were deposited and 15,000 cubic feet of ashlar masonry set during the year. It was found possible to impound at the end of the wet season about 10 million gallons of water, which was afterwards puinped up by the tempor- ary pump for distribution to the City.
(ii) Pumping Station. The site was completed except as regards surfacing, &c., which cannot be undertaken until the material filled in has become consolidated and the buildings have been completed. The walls of the engine-house were ready to receive the traveller girders and the foundations for the pumping engines, which are of cement concrete, were practically completed. The overseers' quarters were completed, except as regards painting, and good progress was made with the boiler-house, workshop, store, chimney, flue, and boiler-seatings, for which additional contracts were let to Mr. KANG OS. A contract for quarters for the Chinese engine-drivers and stokers, &c., was also let to the sume Con-
tractor.
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(iii.) New Road.-The new road from the gap on the Stanley Road was in a forward state up to where it bridges the stream below the damn, but beyond this little work had been done, the Contractor's efforts being concentrated on the first-mentioned section, on which the works are of a heavier nature. For the largest bridge (3 spans of 50 feet) the arches were being constructed; for another (3 spans of 20 feet and 1 of 30 feet) the arches were com- pleted and the spandrels filled in up to stringcourse level; for another (2 spans of 20 feet and 1 of 30 feet) the piers and abutments were ready for the arches, and for the fourth the concrete foundations had been put in. All the heavy cuttings were completed and the larger retaining walls built. Piers to support the rising mains were constructed wherever embankments occur, being carried up from the solid ground.
(iv.) Access Roads to Pumping Station and Gauge Basin.-The cuttings and embank- ment for the road to the Pumping Station were nearing completion; the road to the gauge- basin at the Tunnel Inlet was begun and the track for the suction main was about completed. (v.) Rising Main, 18" diameter.-Pipe-laying was begun on the 17th December and 240 feet were laid.
(vi.) Suction Main, 18" diameter. Pipe-laying was begun on the 20th June and by the close of the year 3,160 feet had been laid. The pipes are in 12-feet lengths and weigh 19 cwts, each and they are therefore awkward things to move about along roads in course of construction and much encumbered with materials. They were carried by gangs of 16 coolies to each pipe.