369 OF ENGINEERING FOEMULÆ.
Gas-works—continued.
Cannel,
from to
11,500 15,000
715 720
710 720
1,540
90
120
Purifiers.
Wet purifiers require 1 bushel of lime mixed
With 48 bushels of water for 10,000 cube feet of gas.
Dry purifiers require 1 bushel of lime to 10,000
cubic feet of gas, and 1 superficial foot for every
400 cube feet of gas.
Products of Coals.
Products. Newcastle,
from to
Cube feet of gas per ton of coal 9,500 10,000
Lbs. of coke .............. 1,500 ’
Lbs. of tar .. .. .. .. *10
Lbs. of ammoniucal liquor .. 80
Fuel required for retorts, about 20 lbs. per cwt.
Motion of Gas in Pipes.
Q = Quantity of gas in cube feet per hour.
L = Length of pipe in yards.
D = Diameter of pipe in inches.
H — Heud of water-pressure in inches.
G = Specific gravity of gas._______
D=.0«^/*’OL
H
G may be assumed = 45 for ordinary calculations,
jj = j au inch to 1 inch.
Services for Lamps.
2 lamps 40 feet from main require | bore of pipe.
4 „ 40 ,, „ i „
6 ,, 50 ,, „ 4 „
io „ 100 „ „ t ,,
15 ,, 130 „ „ 1 ,,
20 „ 150 ;> h »
25 „ 180 „ „ >>
30 „ 200 „ „ if „
B