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Pump Selection
The above pumps are only suitable for liquids having self-lubricating properties. The table below shows the capacity and suggested
driving motor size for different speeds and pressures. These figures are based upon pumping a liquid of about 200 S.S.U. viscosity,
and with a 10-inch vacuum. While Tuthill pumps will develop as high as 27 inches of vacuum, it is sound engineering to reduce the
vacuum to a minimum. The speed of the pump must be reduced when handling liquids of high viscosity and the size on lines increased
to prevent cavitation, loss of capacity and high power requirements.
CAUTION
Remember that the pipeline friction increases at a rapid rate with increase in viscosity. For a given pump and motor, larger pipelines are
necessary to maintain the same pump pressure when changing from a thin liquid to a thick liquid. Viscous liquid pumping installations
are notoriously under powered, due to lack of knowledge in computing pipeline friction. Handling of viscous liquids is a special hydraulic
engineering problem, which the Engineering Department of Tuthill is well equipped to solve for you.
Consult Tuthill for selecting the proper pump, size of motor, and pipeline size for your job with the following information
• Capacity required
• Maximum and minimum liquid temperature when entering the pump
• The viscosity at the minimum temperature
• Total length of suction pipe and discharge pipe
• Suction lift and height to which the pump must force the liquid
Pump Speed
1424 RPM
960 RPM
720 RPM
Operating Pressure
10 PSI
50 PSI
100 PSI
10 PSI
50 PSI
100 PSI
10 PSI
50 PSI
100 PSI
GPM HP GPM HP GPM HP GPM HP GPM HP GPM HP GPM HP GPM HP GPM HP
1012
6 0.5
5.3 .75 4.6
1
4.3 .33
4 0.5
3.7 .75
3.3 .25
3 .33 2.7 .5
1015
12
1 11.2 1.5 10.5
2
8 0.5 7.7
1
7.3 1.5
6 .33 5.7 .75 5.3 1
1018
24.4 1.5 23.7
2
23
3
16
1 16.7 1.5 15.3
3
12 .75 11.7 1.5 11.3 2
1020
40.9
2 40.2
4 39.6 7.5 26.7 1.25
26
3 26.3
6
20
1 19.3 2 18.7 3
1022
55.4
3 54.7 5.5
54 10 37.3
2 36.7
4
36 7.5
28 1.5 26.7 3 25.3 4
1012 - 1022 Series Drawing
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10
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