| Diameter of Steam Cylinder. | Diameter of Water Plunger. | Length of Stroke. | Diameter of Suction Pipe. | Gallons per Minute. |
|---|---|---|---|---|
| 6 | 12 | 9 | 6 | 350 to 400 |
| 12 | 20 | 9 | 10 | 1000 to 1200 |
| 16 | 25 | 9 | 12 | 1400 to 1600 |
| 181⁄2 | 30 | 9 | 14 | 2000 to 2300 |
| 191⁄2 | 33 | 15 | 16 | 3200 to 3600 |
THE “BALLAST” PUMP.
This machine is constructed to meet the requirements of steamship builders and is recognized and adopted by marine engineers of this and of other countries as the standard design for this service and for oil tank steamer work.
It will be observed, see Fig. [449], that its proportions are such as to secure the advantages of large pumping capacity with unusual compactness and moderate weight.
This pump is of the packed piston type, and has the valves so arranged that the water pistons are always submerged, thus making it particularly well adapted for long and difficult suction lifts such as are met with in steamers carrying petroleum in bulk, and in steamers having extensive systems of water ballast tanks.
The demands for water ballast service are generally met by the following two sizes, as shown in the table below.
Fig. 449.
Table.