Page 34 -

..... ........ ...... ....... Centrifugal Pumps

9 Cast and Ductile iron
9 Bronze
9 Carbon and low alloy steels such as 4140.
9 Chrome steels such as 11%, 12% or 13%
9 Martenistic stainless steels in the 400 series.

9 Precipitation hardening stainless steels like 17-4 PH.
9 Austenitic stainless steels like the 300 series or alloy 20.
9 Duplex stainless steels such as CD4MCu
9 Other more exotic alloys such as Hastelloy, Titanium, etc.

Iron and bronze pumps are widely used in general service applications
such as may be found in the water and waste treatment facilities, steel
mills and marine applications. The stainless steels arc used for a range of
corrosive solutions and are suitable for many mineral acids at moderate
temperature and concentrations. Further information on pump
materials of construction can be found in Chapter 15.

1.6.1 N0nmetallic pumps
Nonmetallic pumps also play a major role in the movement of
chemicals, and a number of plastics are used as pump linings as we]] as
complcte pump units because they offer the corrosion resistance of the
more expensive metals at a fraction of the cost. However, they do have
strength limitations that may inhibit their use in certain areas. An
extremely high degree of chemical resistance can be found in the
fluorocarbon resins such as polytetrafluoroethylene (PTFE). Where
additional strength and chemical resistance is needed, a variety of fiber-
reinforced plastics (FRP) are available.