Fig. 496.—For description see page [216].
Fig. [495], upon the previous page, is intended to show a Boggs & Clarke hydraulic dredging or sand centrifugal pump. This is a heavy strong pump fitted with flap valve, without close fitting joints, but with ample room for the water to wash away the sand from the working parts. The cut shows the pump with ejector for priming and large elbow to discharge through. The pump is lined with sheet steel fitted so that it can be easily and cheaply replaced. The diameters in which these pumps are made run from 4 to 12 inches inclusive.
Table.
| Size of Pump | Pipe Size of Flanges | Size of Pulley | Capacity per Hour Cubic Yards Sand | |
|---|---|---|---|---|
| Discharge | Suction | |||
| 4 | 4 | 5 | 12 × 10 | 30 to 40 |
| 5 | 5 | 6 | 12 × 10 | 40 to 60 |
| 6 | 6 | 8 | 18 × 12 | 60 to 80 |
| 8 | 8 | 10 | 24 × 12 | 80 to 125 |
| 10 | 10 | 12 | 30 × 12 | 150 to 250 |
| 12 | 12 | 14 | 36 × 14 | 250 to 400 |
Fig. 497.
Smaller sizes for pumping sand and gravel are made with cast chilled linings with chilled piston, and brass covered shaft especially adapted for stone and marble mills to carry the sand to the saws, or for mining where there is a large quantity of sand to be pumped with water.
The table will convey an idea of the capacity, sizes, etc.