THE “WRECKING” PUMP.

The Worthington wrecking pump, Fig. [448], was constructed many years ago, for wrecking, drainage, or irrigating purposes, and has proved itself to be remarkably well adapted to such service. It is used generally by the Wrecking Companies on the Atlantic and Pacific coasts and the lakes, and is constructed with special reference to reliability, portability and general efficiency.

It is also well adapted for other services requiring the delivery of large quantities of water within the range of lift by suction. It has no forcing power, the water being delivered over the top of the pump into the curb surrounding it. It is single-acting, although the discharge is practically constant, by reason of the quick return of the piston to the bottom of the cylinder, during which inactive stroke the water continues to flow by the momentum already acquired, thus the effect of a double-acting pump is almost produced.

Fig. 448.

The ordinary slide valve is employed, moved by an arm striking against tappets on the valve rod. No auxiliary valves are used in connection with it. The water valves are of rubber, the lower ones being upon a permanent plate at the bottom of the pump. The plunger also is covered with valves. These last open for the passage of water when the piston descends.

On account of its short stroke and large diameter, this pump is extremely efficient, running on comparatively low pressure of steam, and with a very small percentage of loss from friction or leakage. It is also simple and durable, with few parts.

The stated capacities of the pumps given in the table can be exceeded in cases of emergency.

Table.

Diameter of
Steam Cylinder.		Diameter of
Water Plunger.		Length of
Stroke.		Diameter of
Suction Pipe.		Gallons
per Minute.
612 9 6 350 to 400
1220 9101000 to 1200
1625 9121400 to 1600
181⁄230 9142000 to 2300
191⁄23315163200 to 3600