SPECIAL DUPLEX PUMP.

(Outside packed Plunger Pattern for High Pressure.)

Table.

Steam
Cylinders.		 Water
Plungers.		 Stroke. Capacity in Gallons,
per Stroke
each Plunger.		 Strokes per
Minute,
each
Plunger.
Ins. Ins. Ins.
16 5 12 1.02 50 to 100
16 6 12 1.47 50  „ 100
16 7 10 1.66 50  „ 100
16 7 18 3.00 40  „   80
16 8 12 2.61 50  „ 100
16 8 18 3.91 40  „   80
16 9 12 3.30 50  „ 100
181⁄2 7 12 2.00 50  „ 100
181⁄2 71⁄2 12 2.30 50  „ 100
181⁄2 8 18 3.91 40  „   80
181⁄2 9 18 4.95 40  „   80
181⁄2 10 12 4.08 50  „ 100
181⁄2 10 18 6.12 40  „   80
20 8 12 2.61 50  „ 100
20 8 18 3.91 40  „   80
20 9 12 3.30 50  „ 100
20 9 18 4.95 40  „   80
20 10 12 4.08 50  „ 100
20 10 18 6.12 40  „   80
Steam
Cylinders.		 Water
Plungers.		 Stroke. Capacity of
Both
Cylinders, in
Gallons,
per Minute.		 Steam Pipe.
Ins. Ins. Ins. Ins.
16 5 12 102 to 204 21⁄2
16 6 12 147  „ 294 21⁄2
16 7 10 166  „ 332 21⁄2
16 7 18 240  „ 480 21⁄2
16 8 12 261  „ 522 21⁄2
16 8 18 312  „ 625 21⁄2
16 9 12 330  „ 660 21⁄2
181⁄2 7 12 200  „ 400 3
181⁄2 71⁄2 12 230  „ 460 3
181⁄2 8 18 312  „ 625 3
181⁄2 9 18 396  „ 702 3
181⁄2 10 12 408  „ 816 3
181⁄2 10 18 490  „ 980 3
20 8 12 261  „ 522 4
20 8 18 312  „ 625 4
20 9 12 330  „ 660 4
20 9 18 396  „ 792 4
20 10 12 408  „ 816 4
20 10 18 490  „ 980 4
Steam
Cylinders.		 Water
Plungers.		 Stroke. Exhaust Pipe. Suction Pipe.
Ins. Ins. Ins. Ins. Ins.
16 5 12 3 4
16 6 12 3 5
16 7 10 3 6
16 7 18 3 7
16 8 12 3 7
16 8 18 3 8
16 9 12 3 8
181⁄2 7 12 31⁄2 6
181⁄2 71⁄2 12 31⁄2 6
181⁄2 8 18 31⁄2 8
181⁄2 9 18 31⁄2 8
181⁄2 10 12 31⁄2 10
181⁄2 10 18 31⁄2 10
20 8 12 5 7
20 8 18 5 8
20 9 12 5 8
20 9 18 5 8
20 10 12 5 10
20 10 18 5 10
Steam
Cylinders.		 Water
Plungers.		 Stroke. Discharge Pipe. Water Press.
Pump End will
stand, in lbs., per
square inch.
Ins. Ins. Ins. Ins.
16 5 12 3 450
16 6 12 4 450
16 7 10 5 300
16 7 18 6 450
16 8 12 6 300
16 8 18 7 450
16 9 12 7 250
181⁄2 7 12 5 250
181⁄2 71⁄2 12 5 300
181⁄2 8 18 7 450
181⁄2 9 18 7 250
181⁄2 10 12 8 250
181⁄2 10 18 8 250
20 8 12 6 450
20 8 18 7 450
20 9 12 7 250
20 9 18 7 250
20 10 12 8 250
20 10 18 8 250

A test of the superiority of this method of moving, and controlling long columns of fluids under extreme heavy pressures was made at the time of the introduction of long pipe lines for conveying oil from the wells to the seaboard.

Note.—After trying various kinds of pumps for forcing the oil through these long pipes, and after having a succession of disasters in the way of burst pipes, and leaking joints, it was decided to test the efficiency of the direct-acting duplex steam pump. These pumps were placed in the various stations along the pipe lines, and after a continued service of many years, have shown their perfect adaptation to that exceptionally hard service. These pumps convey the oil over mountains where at times the coupled lines have been over one hundred miles long between the pumps, and where the pressure on the plunger of the pump sometimes rises to 1,500 lbs. per square inch.

J. F. Holloway.

Fig. 307.