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The Practical Pumping Handbook ....................................................................................................

that are no longer available in these markets. This in turn, leaves those
markets with inappropriate and usually inefficient equipment with
which to transfer and process the liquids needed in their operation.
The long term consequence of this scenario usually finds these same
end users negotiating low bids on the prices of the over abundance of
spare parts they need to keep their pumps operational. Many of which
are now supplied by third party organizations who, in turn, can take no
responsibility for any changes in hydraulic operation of the pumps for
which they provide the parts.

5.3.2 Value based purchasing
Value Based Purchasing helps us to ensure that the pumps we buy are
the best available in the market and the ones most suited to the
operation for which they are being purchased.
It should be noted that the detailed evaluation and comparison of
pump quotes cannot be considered an exact science as it will always be
necessary to make a subjective evaluation about the accuracy of the data
presented. In this area, some previous experience with pumps and
potential suppliers will be invaluable. However, the overall
consideration must continue to be the best long term value for the
money.
To do that, we must consider specific aspects of the equipment being
purchased.
Hydraulic suitability to the service.
o
Efficiency of operation.
,
Mechanical suitability to the service.
,
Most companies already include some kind of evaluation for the first
two factors in their considerations. The only comment that can be
made would be in relation to the hydraulic suitability of the pump
for the service. This can only be established if consideration is given
to every variation of the system curve as discussed earlier in this
Chapter.
With respect to Efficiency of operation, an evaluation of power cost is
fairly standard, and is based on the particular value of power which is
considered appropriate in each plant. To ensure a real appreciation of
the value of an efficient pump, it is strongly recommended that the
actual power consumption cost for each pump under consideration is
calculated. Do not be tempted into only calculating the difference in
efficiency quoted, as it tends to provide a false impression.
When considering each of the various factors involved in the mechanical
suitability of the pump for the service, the concept is to give a higher

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