Modern Gasworks Practice

26 MODERN GASWORKS PRACTICE Retort House and Coal Store £ £ per mouth-piece. £ per ton of coal per max. day. £ per therm produced per max. day. Brought forward . ... S. Required. make (maximum per , . annual make „ , day) — — - = 2-1 mil- 240 lion cubic feet. Less 25 per cent, for water gas, 1,600,000 cubic feet of coal gas per diem. Make per setting 9,000 x 20 = 180,000 cubic feet. No. of set-. . 1,600,000 tings required , say 9. 8 4 180,000 J In addition 20 per cent, should be allowed for retorts “ scurfing ” or otherwise out of action, bring-ing the total number of beds up to 11. Average cost, including founda-tions and accessories, chimney, etc., £160 per moutlipiece, i.e. 4,900 ■ 22-3 39-2 0'58 220 X 160 Capacity in cubic feet required for 11 settings. Length.—Each setting 9 feet 6 inches + 12| per cent, for passages, outside walls, etc. =120 feet. Width.—Assume projector charg-ing from one side only. ft. Width. of beuch ... 20 Floor space. Charging side 23 „ „ Discharging side 17 Total 60 35,200 160-0 *281-6 4-14 Carried forward .... £ 40,100 182-3 320-8 4-72 * See note page 28.