. Handbook of construction plant, its cost and efficiency. e are used material largerthan 2 size is not likely to stay upon the large belts and formaterial 1 and larger a belt no smaller than 18 should be used. W. R. Ingalls says that the cost of a 12 belt plant capableof running at 300 ft. per minute would be about $600 for lengthsof 100 ft, each, and if properly installed would consume about 3to 3% horsepower. He says that the cost of repairs should beabout 12y2 per cent per annum upon the cost of plant if givensuch service that the belt will last about five years; while if thebelt is so use
. Handbook of construction plant, its cost and efficiency. e are used material largerthan 2 size is not likely to stay upon the large belts and formaterial 1 and larger a belt no smaller than 18 should be used. W. R. Ingalls says that the cost of a 12 belt plant capableof running at 300 ft. per minute would be about $600 for lengthsof 100 ft, each, and if properly installed would consume about 3to 3% horsepower. He says that the cost of repairs should beabout 12y2 per cent per annum upon the cost of plant if givensuch service that the belt will last about five years; while if thebelt is so used as to last only 2% years the repair cost must runup to about 20 per cent per annum. In one actual case in a plantwhere many belt conveyors were used repairs did not averagemore than 12% per cent. Mr. George F. Zimmer is an English authority for the state-ment that the cost of repairs for 100 ft. of traverse varies from%c to lc per ton per 100 ft. for coal, to 2c for coke and 8c forsulphate of ammonia. These figures are given also in the 140 HANDBOOK OF CONSTRUCTION PLANT Mr. Edwin H. Messiter says that for ordinary mine run orethe largest lumps of which do not contain over 1 cubic foot, a30 conveyor is suitable. Sizes of lumps which may be carriedby the several sizes of conveyors are: Lumps Conveyor *Tons per Hour 12 30 560 8 24 360 6 20 250 4 16 160 3 14 120 2 12 . 80 Speeds up to 400 ft. per minute may be used and 700 ft. inspecial cases. Inclination should be limited to 20° from horizontal, but 26°may be used with steady feed and fine material. Life of beltsvaries with tonnage. If correctly designed and made of propermaterials on large conveyors, belt renewals will approximate ton of ore. Cost is greater on small conveyors than on largeones. Horsepower required will average about horse-power per ton per foot of horizontal distance carried, plus ton per foot of height elevated. Automatic reversible trippers are designed to
Size: 1055px × 2368px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectbuilding, bookyear191
