LOW LIFT PUMPING MACHINERY. LXXVII. 
A few cases have been worked out, as to the cost per annum 
per actual horse power of different types, including interest and 
depreciation, and are given below. 
TABLE IV. 
Cost of an Actual Horse Power per Year of 2,500 hours working. 
ain gs Maintenance} Coal at 12s, 
“nd engine, jand tigers per ton and Oil and Total cost of 
Size mp, boiler} ation of an evapor- miscellane- | Labour. | one horse 
of Type of Pump. piping, build-| seven es a | ative Neg ous stores, power for 
Plant. . and jhalf percent.| of 9000 T. 2500 hours, 
foundations. 
£ £ £ £ 
Centrifugal 1 2°7 3°4, 6:0 0°5 6:3 18°9 
~ a ulpp. 
ie: = RotaryPump| 2°6 32 6:0 05 63 18°6 
o + |Recipro- 1 28 3°5 93 0°5 6:3 22°4 
NA! cating 2 
um 3} 33 4-1 35 0°5 6:3 17-7 
Centrifugal 1 a Oe | 2°6 54 0-4 5'2 15°7 
Ye Ay 2:3 2°9 3°9 0-4 5:0 145 
mal Rotary ‘Pump 
Rec 
om ‘ating 2 2°6 32 47 0-4 53 | 162 
Pump. 3) 27 34 |. 2:9 0°4: 5:0 144 
Centrifugal 1 
3 a;|, Pump. 2) 21 2-7 3:7 Or4 32 1271 
7 > Rotary Pump) 
° se ‘ipro- 
S| cating 2) 23 3:0 45 0-4 32 | 134 
Pump. 3) 27 3-4 ae | 04 1 Ge |. 156 
Nothing has been said as to the engines used for driving the 
various pumps, but it has been assumed that equally efficient 
engines are available for any of the types referred to, in the 
tables of prices the probable steam consumption per actual horse 
power per hour has been given, and it will be noticed the great 
saving in fuel due to using engines of rather higher first cost. 
The author has laid this paper before the Society with consider- 
able diffidence, as he is fully aware that little, if anything new 
can be written on such a subject, but it may bring out in the 
discussion much valuable information from members who have 
had to deal with this class of machinery. 
