Page 78 - Know and Understand Centrifugal Pumps

Pump Classification

This pump is used where a liquid must be pumped up from
subterraneous wells or rivers, or from any open body of fluid (lakes,
cooling ponds, tanks and sumps).
Barrel or canned vertical turbine pumps can be used in-line (Piping,
auxiliary booster, and low NPSH applications).

These pumps don’t need priming because the impellers and bell
housings are submerged.
This pump is versatile and adaptable to different applications. It can
handle a variety of extension sections depending on the depth of the
liquid source.
The pressure or discharge head is varied by adding and changing
stages (impellers).
These pumps normally use sleeve bearings lubricated with oil,
grease, or even the pumped liquid (except for abrasives).
The motor carries and supports any axial thrust by the pump
(hydraulic or mechanical). The motor on these pumps can be fitting
with precision rolling element bearings, either angular contact,
spherical rollers, or pillow blocks inclined depending on the thrust
load and velocity of the shaft.

Non-meta I I ic pumps
-~ -
~ ~ ~~ ~ ~ ~~ ~~ ~~
This type of pump is used to handle abrasive, chemically corrosive, and
oxidizing liquids, where conventional pumps would require exotic
alloys. The wet end of these pumps is non-metallic or lined and coated,
sealing and isolating any metal component. The power end is normal.
Non-Metallic Construction Lined/Coated Metallic wet parts
w Epoxy Resin w PTFE
Phenolic Resin w Rubber Lined/Coated
w Polyester w Glass Lined

w Ceramic w Plastic
w Carbon/Graphite

w Most of these pump designs are back-pullout construction.

w Some meet complete ANSI specs.

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