WATER GAS
735
18 Candle-poweb Cabbubetted Gas (Pre-war Cost)
Coke for generators .... . 4rf. per 1,000 cubic feet of gas
Coke for steam raising . IJd. „
Oil, 2| gallons at 4<Z. . 9d. „ „ ,,
Wages . . . ’ • . . l-gd. ff ff
Wear and Tear .... . Id. „ „ „
15. 5cZ. ff ff ff
Less Residuals—
Tar 0-6d.
Pan coke ..... 0-07d.
Sulphur ...... 0-03d.
0-7d.
Net cost Is. 4-3rf. per 1,000 cubic feet.
The above represented the case for a medium-sized plant. It will, of course, be quite evident that as the size of the unit increases so do the various individual items undergo reductioii, for the gas-producing capacity of the attendant and general working efficiency are enhanced pro rata. The above example illustrates in a marked degree the influence of the current value of oil on the cost of the gas. At one time pil could be obtained for somewhat less than 2d. per gallon, but the extent to which it is likely to fluctuate is emphasized by the faet that during the European War large consumers were obliged to pay Is. Gd. As regards Capital cost, much. again depends on the size of the installation ; but in pre-war times the cost of a complete plant of the Lowe type, including housing, boilers, exhausters, purifiers, relief holder, etc., lay between £20 and £25 per 1,000 cubic feet of capacity. The approximate present-day cost of the various portions of the apparatus is exemplified in the instance given in Chapter I.
,000 cubic feet.
9-0<Z.
3-0<Z. 0-125d.
3-5CW.
2-50rf.
0-15<Z.
l-0(M.
E
-i
Ci
o 6t Ä4
Cost of Manufaoture of “ Blue ” Water Gas (Present Day) Per ]
Coke, for generator1 . ■ .
Coke, for steam Water, for steam Wages Maintenance Purification ....■■■■■■■ Establishment charges_______________________________________
Total .
Cost per therm
From the above it will be noted that the present-day cost of “ blue ” water gas is considerably greater than the pre-war cost of 18 candle-power carburefrted water gas. As a contrast it may be pointed out that with coal at 45s. per ton the present-day cost of manufacturing coal gas of 480-500 B.Th.U. per cubic foot calorific power is, after deducting the revenue obtained from residuals, approximately 2s. per 1,000
1 The ultimate cost depends very largely on the coke market.