Chemical house
and washout facilities for drainage of the tank.
The pumps deliver into a 48in dia. manifold located in a trench within the building and this manifold leads into a short length of 48in. main before enlarging to the 66in. dia. used for the remainder of the delivery main. A 48in. dia. Dall-tube flow- meter is installed in this length of main, and continuous rate of flow measurements is transmitted to the high lift pumping station and treat- ment works.
The station is manually operated and provided with similar protection to that for the low lift pumps. Im- mediately outside the pumping station
Site investigation
Treatment plant
is located a 1,950 cu. ft. pressure vessel for protection of the main against surge.
The high lift pumping station also houses the main works switchgear, and adjoining it as part of the same building is a generating station con- taining two 1,500-kW diesel-driven generators. These are available for standby use in the event of a public supply failure, and are capable of supplying the full stage 1 power re- quirements.
After leaving the headworks the 66in. delivery main follows a gener- ally straight cross-country route to the junction with the Tebrau mains. At each end, and at three intermediate
positions, the pipeline can be isolated by means of manually-operated 66in. butterfly valves.
At the Tebrau Junction there is an overhead flyover connection with the two older mains, and each can also be isolated by individual 36in. butterfly valves. Provision has also been made for future additions to the trunk main system upstream or downstream.
The pipeline is of special interest as it is believed to be the largest dia- meter welded steel water main so far installed in Malaysia or Singapore. It is also thinner in relation to its dia- meter than pipes previously used in these countries and required skilful handling, laying, and backfilling techniques during construction.
The standard pipe shell thickness is in., and it has a lin. inner lining of concrete, and an outer wrapping of glass fibre-reinforced asphalt.
Pipes were works fabricated in 25ft. lengths, generally with spigot and socket ends, which were then site welded after laying. Either radiogra- phic, utrasonic, or air testing of welds was carried out depending on the location.
The pipeline was laid underground except at swamp or stream crossings where it is supported on piers or rein- forced concrete piles depending on the depth of soft ground.
Air release valves of various sizes are provided at all high points and at the highest point on the main (260ft. above mean sea leavel) an anti-va- cuum valve is provided to allow air into the main following any drop in pumping head.
The present pipeline will be adequ- ate for the next stage of development, and provision has been made for in- terconnection with any future pipeline.
CONTRACTORS AND MANUFACTURERS
Supply of 66in. pipes etc.
Inspection of steel plate in Japan
Inspection of works fabrication & field welding
for 66in, steel pipelines.
Laying 66in. pipelines
Supply of Valves Part A
Supply of Valves Part C
Pumping plant
Generating plant
Transformers
Switchgear and cabling etc.
Control & instrumentation.
Workshop equipment
Headworks site clearance
Headworks bulk excavation
Treatment works (Group 1) and pumping
stations (Group 11)
Supply of bandscreens for low lift pumping stations
Supply of 48in. & 36in. pipes etc.
10 ton electric operated crane
5 ton hand operated crane
Sheet steel piling
Diaphragm walls to pumping station
Vacuum pumps & compressors.
Supply of penstocks
Floating boom & gates
Vallentine, Dunne & Associates Ltd., Kuala Lumpur. Paterson Candy International Ltd., London. The Asia Engineering Industries Ltd., Singapore United States Consultants Inc., Tokyo. Industrial Inspection (F.E.) Ltd., Singapore
Chong Soon Lee Construction Co., Singapore. Loewy Engineering Co. Ltd., U.K.
J. Blakeborough & Sons Ltd., U.K. Hitachi Ltd., Tokyo.
English Electric Co. Ltd., U.K. South Wales Switchgear Ltd., U.K. R.E. Morris & Co. Ltd., Singapore. George Kent (S'pore) Ltd., Singapore. Reynolds and Wilson Ltd., U.K.
Pee Construction Co., Johore.
Chee Beng Construction Co., Singapore.
The Building Construction Co. Ltd., Singapore.
Ledward-Beckett, U.K.
Boon & Cheah Steel Pipes Ltd., Kuala Lumpur. Munck International A.S., Norway. Sumitomo Shoji Kaisha, Singapore.
Nissho Co. Ltd., Singapore.
Piling & Construction Co. Ltd., U.K. Worthing-Simpson Ltd., U.K. Glenfield & Kennedy Ltd., U.K. Beaudrey Norcros Ltd., U.K.
40
Far East BUILDER, August 1968.
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