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The Practical Pumping Handbook m-- ~_~ ............ z ~ _ .... _~
Figure 1.1 5 Double suction pump (Reproduced by permission of Fairbanks Morse- Pentair
Pump Group)
1.5 Double suction pumps
In applications where large volume flows are required, a single stage
horizontal double suction pump may be used. They are also the
preferred design when a high degree of reliability is required such as in
remote pipeline applications. These pumps consist of a single double
suction impeller where the liquid enters the impeller from both sides
simultaneously and thus creates a high degree of axial balance in the
rotating element. It also contributes to the fact that both stuffing boxes
only see the suction pressure of the pump.
The pump casing is horizontally split along the axis of the shaft. This
permits removal of the rotating assembly without disturbing suction
and discharge piping or the driver mounting. The lower half of the
casing includes the heavy mounting structure.
1.6 Materials of construction
Most pump manufacturers can providc their pumps in a wide
assortment of materials, the selection of which depends on the
operating stress and effects, as well as the type of wear from the product
being pumped. The most common materials used in end suction
centrifugal pumps are as follows:
