106 MODERN GASWORKS PRACTICE
No. I
Settings of “ Tens.” Two vertical rows of 5 retorts, 24 inches x 16 inches x 20 feet. Say, 10 beds, carbonizing 120 tons of coal per diem. Capacity, 1J million oubic feet per diern, Straight eoal-gas.
Foundations and excavation, for bench and chimney .
Arches, spandrils, main flue ______________________....
Buckstays and steel bracing ______________________....
Chimney: Brickwork, £4 4s.; bracing, £1 5s.
Mouthpieces, hydraulic mains, ascension pipes (both ends of retort), and all retort ironwork
Tar towers (C.I.) and fittings ______________________....
Retort-house governor and connections
Retort settings, producers, producer ironwork, etc.
£ 6 31 7 4 s. 6 0 0 9 d. 0 0 0 0 per mouthpiece. ff „ ff ff ff
40 0 0 ff ff
2 7 6 ff ff
1 17 6 «•
62 0 0 ff ff
___________
£155 0 0 per mouthpiece.
(Pre-war £50 10 0 per mouthpiece.)
i.e., £258 per ton of coal per maximum day. (Pre-war £83.)
Or £20 10s. per 1,000 cubic feet of gas per maximum day. (Pre-war £6 15s.)
£ s. d.
Bench and fittings as above . . . . 155 0
Retort house, including roof and foundations and coal store____________________________________________85 0
Stage floors: Steelwork, £9; concrete and expanded metal, £4 10s. . . . . . . . 13 10
Tunnel floors . . . . . . . .60
Stokingmachinery(say, combined discharger-charger coal conveyors, breakers, elevators, hoppers) . . 75 0
Electric genera ting plant, in duplicate. . . . 15 10
0 per mouthpiece.
0
0
__________
£350 0 0 per mouthpiece.
i.e , £583 per ton of coal per maximum day. (Pre-war £210.)
Or £46 10s. per 1,000 cubic feet per maximum day. (Pre-war £16 15s.)
N.B. It should be explained that costs for horizontal retorts based on coal used or gas procluced per maximum day are liable to be erratic for the reason that by the manipulation of the charges (such as working 10-hour instead of the more common 12-hour charges) more coal can be “ through-put ” in 24 hours; conse-quently, more gas than is customary is produced per unit of time. In the above calculations, a normal production of 7,500 cubic feet per mouthpiece per diem has been assumed, this being straight coal-gas with no steaming. Computations are best carried out by considering expenditure per mouthpiece.