'S IQ
MODERN GASWORKS PRACTICE
£ £ per therm produced per max. day-
Brought forward . . £ 24,770 14-57
Meter to pass 25,000 cubic feet per hour 750 044
Relief holder, 35,000 cubic feet capacity, at £125 per 1,000 cubic feet 4,400 2-59
Gas, tar, steam and water Connections ..... 750 044
Total cost of complete water-gas plant, i.e. £61 per 1,000 cubic feet per max. diem ...... £30,670 18-04
(N.B.—For a comparatively small outlay, either section could be increased to 300,000-350,000 cubic feet per diem.) Cost of coal-gas plant ....... 210,550 24-77
Total cost of works ■■■■... £ 241,220 23-83
Cost per million, cubic feet made per annuni . . £-182
Cost per million cubic feet made per annuni . . £-182
1 Cost per million cubic feet sold per annuni . . £502
Cost per 1,000 cubic feet made per max. diem.. . £115
Cost per 100,000 B.Th.U.’s made per max. diem. , £23 17s.
The costs per therm of the water-gas installation are based on the quality of gas taken in this illustration, i.e. 340 B.Tli.U. per cubic foot. Th.e figures given are not, therefore, a true indication of the capabilities of a water-gas plant in this direc-tion. Thus, if 1 gallon of oil per 1,000 cubic feet was used for carburation, a thermal value of 400 B.Th.U. per cubic foot would be expected, this giving a reduction of ab out 15 per cent, on the cost per therm produced2 per maximum day. If 2 1 gallons of oil were used a gas approaching 530 B.Th.U. would be produced, this givmg a reduction in the cost per th.erm of about 36 .per cent, as compared with. the figure given in the tabulated data above. With. a blue water-gas plant (utiliz-ing oil or tar spraying to bring up the quality to 340 B.Th.U.) the outlay would be approximately as follows :—
Generator plant (in two sections) ...... 7 500
Boilers and settings ...... 3 200
Exhausters ........ |250
Purifiers.............................................................4’500
Buildings.............................................................3’000
Purifier shed ......... j 000
Meter ....... 750
Relief holder ....... 4 400
Connections, etc. ....... 700
£26,300
Cost per therm per maximum day ...... £15 10s.
1 Estimated at 480 million cubic feet.
2 N.B. This is on Capital cost of plant, not manufacturing cost of gas.