The existing primary pumping sets obtain their water from suction pipes Inid on the bottom of the river; {o the river end of these suction pipes is fitted an adjustable: arm worked. from a. supporting: timber structure which also serves: as a filling: point for the company's water boats. Owing to the Huang pu Conservancy Board's intention to dredge a channel inside the. exist 1g intakes the pipe supplying the nett pump had to be sunk 10 feet below low water level. In view of the danger of along suction at this' depth and to the desirability of: the. new pine supplying more than! one pump, it wa; decided to sink a cylinder in the river bed, to. construct a suction well immediately] outside the pump house and to con-neet the two by means of tube sufficiently large to supply three! tone million gallon an hour pumps by gravity.
The cylinder has a total length of 45 feet, 18 feet being below the river bed." The cylinder consists of steel sections, welded not rivetted: the sections are connected by it ternal flangers. A diaphragm with four hinged doors in placed below the tube opening; these doors were opened during the sinking of the cylinder to allow the mud to be removed and could be closed to control the perpendicularity of the cylinder. Three 48 in, sluice valves are placed below L.W.L. in the cylinder and are operated by ge: ing from a platform at the top. the cylinder is 170 ft. long and is of steel, each section being! also welded longitudinally; the are joined by loose flanges. tube also contains a pressure supply pipe for filling water boats and a mud discharge pipe from the continuous settling tank mud pump.
Water from the settling tanks to the service reservoirs and filters is pumped by means of nine centritegal pumps, four being steam driven and the remainder being} driven by suction gas engines. The three largest pumps have " capacity] of 450,000 gallons per tour, and are ingle stage low lift centrifugals driven by horizontal double cylinder engines working on four stroke cycle, each with a BLP. of 162 and a speed of 170 r.p.m. The drive is by rope in the case of the larger} and belt in the smaller sets. Gas is provided by six suction pro. ducers each consisting of genera-for. vaporiser and coke scrubber; the fuel employed is anthracite,
Text read from the printed page and cleaned; old type leaves the occasional error.