XIII, A, 3 Ycasiano and Valencia: Producer-gas Plant 125 



Table X. — Cost of installation and operation. 



[Net capacity of the plant, 44 kilowatts.] 



Pesos. 



Total investment, including transportation, founda- 

 tion, and installation 17,945.00 



Fixed charges per annum: 



Interest at 8 per cent 1,435.60 



Depreciation at 7 per cent 1,256.15 



Maintenance and repairs 3 per cent 538.35 



Total 3,230.10 



Operating cost (8 hours' daily run) : 



Fuel at 8 pesos per ton 927.28 



Wages of one power engineer and one fireman 1,825.00 



Oil and waste 91.25 



Total 2,843.53 



Total kilowatt hours for 300 days 74,400 



Fixed charges per net kilowatt hour 0.0434 



Operating cost per net kilowatt hour 0.0382 



Total cost of operation per net kilowatt hour 0.0816 



Operating cost (24 hours' daily run), 300 days: 



Fuel at 8 pesos per ton 2,781.84 



Wages of three power engineers and three fire- 

 men 3,475.00 

 Oil and waste 205.30 



Total 6,462.14 



Fixed charges per net kilowatt hour 0.0144 



Operating cost per net kilowatt hour 0.0289 



Total cost of operation per net kilowatt hour 0.0433 



In the calculations in Table X the number of days in a year 

 was taken as three hundred. Both the maintenance and repairs 

 were included in the fixed charges as so much percentage of the 

 capital invested. The water used for cooling the engine and 

 cleaning the gases was not included in the calculation — its cost 

 per kilowatt hour is insignificant. 



SPECIAL DIFFICULTIES AND MEANS OF AVOIDING THEM 



Clinkers. — The Batan coal, which contains a high percentage 

 of moisture, was formerly used in the producer without any endo- 

 thermic agent except the natural moisture. At that time the 

 longest safe run was sixteen hours. This was due to the for- 

 mation of clinkers on the wall of the producer and to a thin but 



