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Boiler Furnaces.
The boilers, whether Lancashire or water tube shall be provided with separate furnaces for coal firing if required, provided with forced draught. In the case of the water tube boilers, our patent side boxes shall be introduced. The forced draught to the boilers shall be provided by means of our patent steam jet apparatus.
Feed Pumps.
One Worthington Duplex Feed Pump 44′′ × 23′′ × 4" with brass lined water ends shall be pro- vided, with all necessary fixings and fittings.
Tank.
One wrought iron tank of 1,000 gallons capacity, fitted with ball-cock and overflow together with all water pipes from tank to pump, and pump to boilers, steam pipes from boilers to pump, and all necessary cocks and fittings, the water supply to the tank to be provided by the Municipality.
Economiser.
One Green's patent Economiser of 224 pipes shall be provided and fixed.
Dust-catcher.
One of our patent centrifugal Dust-catchers 20 feet diameter, lined with best firebrick and pro- vided with iron bands and cleaning doors shall be provided.
Chimney.
One brick chimney 100 feet high by 6'. 6′′ inside diameter having an octagonal shell, lined with circular firebrick lining from the bottom to the top, strongly constructed throughout and fitted with lightning conductor, shall be provided.
Furnace for Drying Offal.
A furnace for this purpose, heated with hot gases from the destructor shall be provided as shown upon the drawing. A suitable mattress chamber shall be provided. This chamber will also be suitable for burning putrid meat, carcases, etc.
The inclined Roadway and paving of tipping platforms shall be provided by the Municipality. The iron work construction of the tipping platform as well as the construction and laying of rails upon the loading and storage bay, and platforms over furnaces, is, however, included in this tender.
Capacity of Cells.
The cells are guaranteed to burn 74 tons per cell per 24 hours of the Ordinary Hongkong City refuse, when properly managed by skilled stokers. It is difficult to estimate the total horse power which will be available, which will entirely depend upon the calorific value of the refuse. The latter will probably be low, but we think there will be something like 200 I.H.P. available if required.
Repairs.
The estimated annual cost of repairs to the furnaces, based upon experience in this country, will not exceed £3 to £5 per cell.
Building.
This shall be of brick with iron roof, covered with local tiles. The design shall be as shewn on drawing. No external walls to be of less than 14 inches, all the walls of buildings to be constructed of local brick. A ventilator, louvre boarded, running the whole length of the building shall be provided with steel and iron principals, the foundations to each part of the work which are included in this tender are clearly shewn upon the drawing.
Any additional foundations which may be found necessary shall be measured up and allowed for at current local rates.
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THE HORSFALL FURNACE SYNDICATE, LIMITED, 16th November, 1898.
DEAR SIR,--In reply to your favour of the 1st, we beg to enclose herewith a revised summary of the prices for our destructor scheme for Hongkong, in accordance with your requirements.
The item "drying oven" is the offal-drying chamber, shewn on plan. You are also correct as
to the feeding arrangement, two back to back cells being fed from the same opening.
In case of wishing to work one cell, with the opposite one stopped, all that is necessary is to put in a temporary brick stopping at the back of the cell which is not to be worked. This will prevent the heat or the refuse from passing from one cell to the other. With both cells working, the feed opening might be filled with refuse at each charging, and the refuse would be pulled forward on to the fires as required.
The exact arrangement shewn is not erected anywhere at present, but it is practically the same as our hand-fed back-to-back type, which is working so successfully at Edinburgh, Bradford, etc., almost the only difference being in the fact that the refuse is tipped direct into the feed hole, instead of being tipped first on top of the furnaces, and then thrown into the feed hole by the men.
There is not the slightest doubt as to the effective working of the arrangement, which we are about to put into a most important contract in London.
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