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The Practical Pumping Handbook - i : ............ ::::: ::::::: ::z

However, even 'water' comes in different forms, from Condensate to
Brine, which could require a wide variety of corrosion resistant
materials. Even Sea Water can vary in corrosiveness from one part of the
ocean to another. In addition, the abrasiveness of the water in a
particular mine may dictate the use of a rubber lining in the Mine
Dewatering pump purchased, while other mines have less expensive cast
iron pumps performing what, at first glance, appears to be the same
service.
It is also worthwhile to remember that numerous new chemicals are
now being introduced to many industrial processes, therefore a detailed
knowledge of the liquid should never be assumed.

Consequently, the following items should be considered the minimum
data required for the selection of an appropriate centrifugal process
pump to suit the service for which it is intended.

The liquid to be pumped.
o
2. Flow rate required.
3. Total Dynamic Head.
4. Net Positive Suction Head available.

5. Operating temperature.
6. Specific Gravity.
7. Nature of the liquid. (See listing above.)
8. Operational experience.

5.1.1 Operational experience
The last item on the above list, 'Operational Experience', is the kind of
information that is rarely found recorded anywhere and usually needs to
be uncovered by exploring the following topics.

9 Is it on a nonstop duty?
9 What is the start/stop frequency?
9 Will it be used on one operation only?
9 Will it pump a variety of liquids?
9 What kind of controls are on the discharge?

9 Will the flow be restricted at any time?
9 Is it on an open or closed loop or a transfer system?
If it is a replacement pump, other questions should include;
9 What pump model was used?

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