[1046]. Double ram pump.
Rising mains in mines and wells have been used as the main pump rods in some instances.
In pumping up to a tank or reservoir from which a down service pipe is taken, the pump can be arranged to deliver into this pipe at its nearest convenient point, instead of having a second pipe from the pump to the tank.
[1047]. Schmid’s trunk cyl. hydraulic pumping engine utilises a low-pressure supply to force from the annular side of the piston a high-pressure service.
See also rotary engines and pumps, [Section 75].
Pumping engines, [Section 61].
Section 57.—PIPES AND CONVEYORS.
Plain tubing may be either of iron, brass, zinc, lead, tin plate, sheet iron, papier mâché, indiarubber, guttapercha, leather, cotton, or canvas.
Flexible sorts of the last five materials named are strengthened when required by spiral wire, either inside or outside or imbedded in the material; also, in the case of rubber, by canvas insertion; or by being payed with yarn or wire, either wound or plaited round the exterior.