P.W.E. Hongkong.
Q 76
In 1916, the quantity pumped was 325 million gallons. On the 1st January, 1917, the amount of water remaining in the reservoir was 182 million gallons and on May 15th, when it reached its lowest level, the water in it had been drawn down to the level of the lowest draw-off. As already mentioned, the total capacity of the reservoir is 1,420 million gallons.
The extension of the pumping station for the accommodation of the new machinery was commenced in June 1914 and was completed by the 1st December 1916. It was virtually completed by the 1st January, 1916, subsequent operations consisting only of finishings which were dependent on the progress made with the erection of the pumping machinery. The buildings, as extended, comprise an engine-house, 129' 0" in length by 30' 0" in width and 25' 9" in height, and a boiler-house, 83' 0" by 17' 0". The workshop, store and quarters remain as they were built (1904-1908) and have not been added to. The portion of the main flue, which extends from the boiler-house to the base of the hill on which the chimney-shaft stands, has been enlarged from 4' 3" × 2' 6" to 5' 0" × 3' 6", but the remaining portion extending up the hill to the base of the chimney-shaft and the chimney-shaft itself remain as originally built. The small masonry pier constructed in 1904-1908 for landing purposes has been extended by adding a T-shaped head of reinforced concrete. The T-head projects a distance of 40 feet from the old pier, its width at the inner end being 27 feet and at the outer end, where a double flight of landing steps is provided, 40 feet. The depth of water at the head is 7' 6" at low water Ordinary Spring Tides which is sufficient to enable coal junks and small craft generally to come alongside at all states of the tide.
The two sets of pumping machinery which were supplied and erected by Messrs. James Simpson & Co., London, are of the vertical, inverted, direct-acting type. The engines are triple expansion, the piston-rods of the three cylinders being directly connected to single-acting plunger pumps by means of crossheads and side rods. Each engine has two fly-wheels (one at each end of the engine), the crank-shaft being prolonged for outer bearings beyond both wheels. The high-pressure cylinder is 18" in diameter, the intermediate cylinder 31" and the low-pressure cylinder 50". The plungers of the pumps are 15.3" in diameter. The stroke is 36" and the engines are designed to run at 30 revolutions per minute, the capacity of each engine at this speed being 3 million gallons per 24 hours. They are however specified to be capable of running efficiently and economically at a slower speed when raising 30% less than the quantity stated. The maximum efficiency is specified when working against a head, inclusive of friction, of 350 feet, and pumping at a rate of not less than 3 million gallons in 24 hours. Three boilers of the Lancashire type are provided, each 26' 0" in length by 7' 6" in diameter. Two boilers are specified to be capable of supplying steam to the whole plant under all conditions of working, the third boiler being in reserve. The boilers are
P.W.E. Hongkong.
Q 76
in 1916, the quantity pumped was 325 million gallons. On the 1st January, 1917, the amount of water remaining in the reservoir was 182 million gallons and on May 15th, when it reached its lowest level, the water in it had been drawn down to the level of the lowest draw-off. As already mentioned, the total capacity of the reservoir is 1,420 million gallons.
The extension of the pumping station for the accommodation of the new machinery was commenced in June 1914 and was com- pleted by the 1st December 1916. It was virtually completed by the 1st January, 1916, subsequent operations consisting only of finishings which were dependent on the progress made with the erection of the pumping machinery. The buildings, as extended, comprise an engine-house, 129' 0" in length by 30′ C" in width and 25′ 9′′ in height, and a boiler-house, 83' 0" by 17′ 0′′. The workshop, store and quarters remain as they were built (1904- 1908) and have not been added to. The portion of the main flue, which extends from the boiler-house to the base of the hill on which the chimney-shaft stands, has been enlarged from 4′ 3′′ × 2′ 6′′ to 5′ 0′′ × 3' 6", but the remaining portion extending up the hill to the base of the chimney-shaft and the chimney-shaft itself remain as originally built. The small masonry pier constructed in 1904-1908 for landing purposes has been extended by adding a T-shaped head of reinforced concrete. The T-head projects a distance of 40 feet from the old pier, its width at the inner end being 27 feet and at the outer end, where a double flight of landing steps is provided, 40 feet. The depth of water at the head is 7′ 6′′ at low water Ordinary Spring Tides which is sufficient to enable coal junks and small craft generally to come alongside at all states of the tide.
The two sets of pumping machinery which were supplied and erected by Messrs. James Simpson & Co., London, are of the vertical, inverted, direct-acting type. The engines are triple expansion, the piston-rods of the three cylinders being directly connected to single-acting plunger pumps by means of crossheads and side rods. Each engine has two fly-wheels (one at each end of the engine), the crank-shaft being prolonged for outer bearings bevond both wheels. The high-pressure cylinder is 18" in diameter, the intermediate cylinder 31" and the low-pressure cylinder 50". The plungers of the pumps are 153" in diameter. The stroke is 36" and the engines are designed to run at 30 revolutions per minute. the capacity of each engine at this speed being 3 million gallons per 24 hours. They are however specified to be capable of running efficiently and economically at a slower speed when raising 30% less than the quantity stated. The maximum efficiency is specified when working against a head, inclusive of friction, of 350 feet, and pumping at a rate of not less than 3 million gallons in 24 hours. Three boilers of the Lancashire type are provided, each 26′0′′ in length by 7'6" in diameter. Two boilers are specified to be capable of supplying steam to the whole plant under all conditions of working, the third boiler being in reserve. The boilers are
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