Sessional_Paper_1899 — Page 164

Forced Draught.

161

The draught shall be forced by 2 Schiele Faus, driven by Steam Engines placed as shown on drawing and arranged so that the whole of the air for combustion is forced by way of the Blast Flue situate between the rows of Cells through our Patent iron Side Boxes, and thence into the Ashpits below the Grate Bars. The Feeding Floor is thus ventilated, and the air heated before entering the fire.

Front Flues.

The only openings for the escape of the products of combustion shall be in the front, over the Clinkering Door, so that all the fumes given off by the green refuse in drying have to pass forward and over the hottest part of the fire before they can escape to the Chimney, and are thus thoroughly "cremated" within the Furnace itself. From the Front Flues the gases pass along the Cross Flues, and thence by the Downtakes into the Main Flue.

Grate Bars.

The Grate Bars are to be of our most improved construction, with fine air spaces to prevent coin- bustible material from falling through before being burnt.

Brickwork.

The Furnaces to be built of good local red bricks, faced on the outside with picked stock facings. The Furnaces and Flues to be lined with our Special Brand of Ganister Bricks and Blocks; and the Ashpits and Air Ducts to be lined with seconds Salt-Glazed Bricks, set in Portland Cement mortar.

Ironwork.

The Doors and Frames to Ashpits, Front and Back Dead Plates, Grate Bars and Bearers, Clin- kering Doors and Frames, Flue Cleaning Doors and Frames, Side Boxes and Trumpets, and Feed Hole Doors and Frames, shall be all substantial Castings, properly fitted together. The Clinkering Doors are of an improved pattern, with vertical lift and balance weight.

Stays.

The Furnaces are to be strongly stayed with Channel Irons, 12′′ × 31′′ and 6′′ × 3′′, Girders 8′′ × 4′′, and Tie Bolts 14" diameter, with enlarged ends and strong Washer Plates.

Boilers.

Alternative boilers are provided, either of the water tube type or of the Lancashire type.

Water Tube Boilers.

These, if adopted, shall be two in number, BABCOCK AND WILCOX' patent, each boiler 1,218 sq. feet of heating surface suitable for a working pressure up to 120 lbs. per square inch provided with first-class boiler fittings of best make, including safety valves, water gauges, steam gauges, blow-off valves, etc., etc. The boilers to be constructed to Messrs. BABCOCK AND WILCOX standard specifica- tion, of which a copy will be provided if desired.

Lancashire-Boilers.

The Lancashire boilers, if adopted, shall be each 30 feet long by 8 feet diameter, of first class construction throughout, made entirely of mild steel plates, and suitable in every respect for a work ing pressure of 120 lbs. per sq. inch, Each boiler shall be provided with safety valve, juuction valve, steam gauge, water gauges, blow-off valve, and all other fittings of first-class make, and a copy of the Makers' specification shall be provided if required.

In each of the above cases, one boiler is intended to provide the requisite steam, the other to act as a stand-by in case of emergency.

Boiler Settings.

These shall be constructed on the most approved principles, and lined throughout with firebrick.

Shutting of Cells.

Any cell can be shut off for repairs without stopping the rest, by placing an iron plate or a quarry in the take-away flue at the top of the furnace. The cell will then be completely isolated and no cold air can pass through into the flues.

Feeding Arrangements.

These shall be of our latest patent type, the refuse being tipped out of the collecting carts into tipping waggons running on a set of sidings provided on the loading and storage bay. Kails are provided along the platforms and over the tops of the furnaces, and the refuse is tipped out of the tipping waggons into the charging holes. There is thus no handling of the refuse.

Forced Draught.

This shall be provided by means of two Schiele fans, 30" diameter, driven independently by means of two Marshall's vertical high speed engines, 64" diameter by 10" stroke, fitted with high speed Pickering's governor, and usual fittings of best quality.