Page 344 - Centrifugal Pumps 2E

Chemical Pumps Metallic and NonmetalHc 309

Table 15-1
Vertical Metallic Sump Pump Bearings
Max Min Shaft
Bearing Material Temp °F Temp °F Liquid Mat'!
Bronze 180 -20 Water & Carbon
compatible steel
liquids
Iron 180 -39 Water & Carbon
compatible steel
liquids
Rubber 160 39 Abrasive with 316
liquids compat-
ible to rubber
Carbon 350 -65 Acids, chemicals 316
hydrocarbons
Teflon grease lube 180 0 Chemicals 316
Teflon product lube 350 -100 Not compatible 316
with teflon

Figure 15-16. Minimum submergence versus g.p.m. for vertical sump pumps.

Most of these pumps are designed like a horizontal pump except they
have a self-priming casing. These pumps are used in mine dewatering
(which is usually acidic), or in refinery service where a vertical immer-
sion pump may not be used because of the space limitations.

NonmetalHc Pumps
In the past 30 years, the demand for pumps with greater corrosion re-
sistance than is offered by the high alloy stainless steels and nickel-based