PURIFICATION.
213
Station and Date.
Crude Gas. First Purifier. Second Purifier. Third Purifier.
Lime-machine having been charged hours with bushels of lime.
The paper of the third purifier should remain colourless.
The following particulars of the construction of wet-lime purifiers of a larger size, aretaken from the specification of those made for the great Central Company’s Works at BowCommon; the purifiers being 15 feet diameter by 3 feet deep inside measure:—
Top and Bottom Plates to consist each of a centre plate and ten outer plates. The centre plate tobe 5 feet 1 inch in diameter, with a 3-inch flange round the circumference, supported by fillets 6inches apart, and to have 6 ribs cast upon it 4 inches deep where they terminate round the inlet-pipe,and 2 inches deep where they finish at the outside flange; the flanges and the strengthening ribs tobe on the outside. One-half of the centre plates, which will form the bottom to each, to havea shoe cast on its centre in the inside, with a proper socket in its centre to receive the lower end ofthe agitating shaft. The other half of these plates, which will form the centre of the top, each tohave a 14-inch flange inlet cast in its centre, 5 inches high, with 2^-inch flange and 6 bolt holes.The outer plates, twenty in number to each purifier, to radiate round the central plates, forming withthem a circle 15 feet 6 inches in diameter. Each plate to have a rib up its centre on the outside, 2inches high at the inner end, diminishing to the surface of the plate at the circumference. Oneof these plates in each purifier to have a 14-iuch flange outlet cast upon its outer surface, standing5 inches high, flange 2J inches broad, with 6 bolt holes. The centre of this outlet to stand 1 foot1 inch from the inner end of the plate. The plate to have a 3-inch flange on three sides.
Side Plates to be ten in number to each purifer, 3 feet deep with flanges all round the plate 2^inches broad on the outside, with proper strengthening fillets, one between each bolt-hole, 6 inchesapart; a small ornamental strengthening bead to be cast on the outside of the plate. Two of theseplates in each purifier to have two brackets cast on their inner surface; their upper surface, uponwhich a beam will rest, to be 1 foot 6 inches from the top sidb of the plate, for the purpose of sup-porting two cast-iron beams to support the centre inlet cylinder, and 3 feet 2 inches apart, centreto centre.
Inlet Cylinder to be 3 feet inside diameter, made of j-inch wrought plates, 2 feet deep, with a 2^-inch flange round each end, the one to bolt to the crown plate, the other to bolt the dash-plate to.This cylinder to have snuggs riveted on it, which will rest on the beams that are to be supported onthe snuggs cast on the side plates.
Beams which support Cylinder. —Two to each purifier to be 14 feet 7 inches long, 6 inches deep atthe centre, diminishing to 4 inches deep at each end, and 14 inch thick, with holes for bolting-outhe short cross-beams to those beams to be 3 feet long, 6 inches broad, and 1 inch thick returnends.
Dash-Plate to be 14 feet 4 inches in diameter, made of |-inch boiler-plate with a 3-feet hole cutin its centre. This plate to be bolted to the inlet cylinder with ^-incli bolts 9 inches apart, all roundthe cylinder, and likewise supported by 1-inch angle-iron suspending rods from the roof, 10 inches;the circumference kneed at each end, and fastened with two |-inch bolts ; a ring of sheet-iron, half