American Filter Plant in Siam.

American Filter Plant in Siam.

A contract has just been entered into between the Siamese government and the Jewell Export Filter Company, of New York. The negotiations tor this contract have been largely carried on by correspondence and by consultation in Europe between representatives of the two parties concerned. The contract consists in the supply of the filter plant for the proposed water supply system to be erected in Bangkok in the near future. The scheme for the proposed water supply was first reported by this legation and by the American consulate general here in various reports ,n 1909, and was the subject of several foreign trade opportunity notices in Daily Consular and Trade Reports, and of confidential bulletins issued by the Bureau o f Manufactures. Since then, contracts for the conduct pipes have been signed with a French firm (see Daily Consular and Trade Reports for September 28, 1910), and the Siamese government has determined (to construct the canal, to erect the electrical power plant to be used in the distribution of the water to the city, and to supply the settling tanks and pure water basin themselves under the supervision of European engineers in their employ. The filter plant itself alone remained to be furnished, and this is to be done by the American firm named. A brief outline of the plan for the water supply in Bangkok as it at present obtained, together with an account of that part of it supplied by the Jewell Export Filter Company, follows: The scheme proposed includes, first, a canal approximately 25 miles long; second, four settling tanks, filters, pure water reservoirs at ground level and raised reservoir, and electrically driven pumps.

CanaJ.—This is to tap the river far enough above the town to avoid the use of brackish water.

The canal will be constructed by the Siamese Irrigation Department, and will be used solely for irrigation and water supply, boating not to be allowed.

Settling tanks.— There will be four settling tanks into which the water will he elevated on its arrival at the waterworks. These tanks are used for a preliminary treatment which is given to the water prior to filtration. They will lie raised sufficiently to allow the water to flow from them over onto the filters by gravity. They will also be constructed by the government and will prpbably be made of ferroconcrete.

Filters.—It has been proposed and agreed to use the American system of rapid filtration known as the Jewell open gravity type. There will be 12 filters, each 17 feet in diameter. They will be arranged in two rows in battery, so that each filter can be worked independently or ill battery with any or ail of the others The floor space occupied by the filters and their auxiliaries will he approximately 53 by 13n feet. They will he constructed oj steel, and will be located in suitable building, which latter will also be supplied by the government. The price quoted for complete filter plant, delivered and erected by the American company is $Hu,330.

Pure Water Basin. After passing through the filters, the tillered water is discharged into a reservoir Imilt underground, from where it is finally pumped to the raised reservoir, which will serve the town by gravity. The raised reservoir will also he supplied by the government, and probably will he built locally.

Pumps and Motors—The Siamese government intends to install a generating station for the lighting of Dusit Park, and it is probable that power will he taken from this station (if installed) for driving motors and pumps at the waterworks. Of the latter, two sets will be required, as the water will have to be lifted twice in the usual way, first to the settling tanks and then to the high service reservoir. In that case, power will be transmifted from the park station over considerable distance.

Distribution Piping—The pipes for distributing the water to the town have already been ordered, and these are being purchased front a French company. They are of a pattern not in general use, having a rubber ring where American patterns are ordinarily put together with lead joints or rust joints. From American Minister, Hamilton King, Bangkok.

A water tunnel in service thirty-live years in Chicago was clean and looked as if it had just been built, according to the city engineer’s report. It crossed the Chicago river at 1 .a Salle street, and was destroyed by the demolition of the old street railway tunnel. It has a 7-foot internal diameter and is lined with three rings of sewer brick, laid in cement mortar. Inspection of that portion between the Jefferson street tunnel and the Chicago avenue pumping station showed that most of the old line and grade points as run by the engineers during construction were in position, and a large percentage of the station numbers were still in position on the sides of the tunnel. For the entire length inspected, no leaks, cracks or other defects were apparent.

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