44 | IM-112 DECEMBER 2019
Vertical Turbine Pumps
2001299 - VTP- IOM
44 | IM-112 DECEMBER 2019
Vertical Turbine Pumps
2001299 - VTP- IOM
44 | IM-112 DECEMBER 2019
Vertical Turbine Pumps
2001299 - VTP- IOM
Vertical Turbine Pumps
Maintenance
Document Name: 2001299-VTP-IOM-EN Page 44 of 67
Revision 3 Copyright © 2014, Weir Floway, Inc. All Rights Reserved. Issue Date: December 12, 2014
Figure 7-1 on page 43 indicates the approximate effect of raising semi-open impellers from their ideal (a)
operating position. Raising the impellers increases the clearance between the impeller and the bowl seat and
reduces the performance accordingly. The chart is generic and not exact for any particular pump model since
each model reacts differently. 100% head and capacity are to be taken as the head and capacity of the pump
at the best efficiency point (BEP).
For example, if a particular pump delivers 250 gpm and 50' head at BEP, when impellers are properly
adjusted, raising the impellers 0.080" will reduce the capacity to approximately 181 gpm (72.5% of 250 gpm)
while maintaining 50' head or conversely, the pump will deliver 250 gpm at 37.5' head (75% of 50'). The
horsepower will be about 91.50% of the previous horsepower.
7.7 Pump Lubrication
Other than the packing box lubrication outlined in “Packing Box Greasing” on page 40 and lineshaft
lubrication outlined in “Lineshaft Lubrication” on page 37 the pump does not require further periodic
lubrication. The suction bearing should be repacked with grease when repairs are done on the bowl assembly
(it is not necessary to repack the suction bearing before bowl assembly repairs are required). Special pump
construction may allow for more lubrication options, reference the pump’s Certified Outline Drawing for such
features and details.
7.8 Driver and Auxiliary Equipment Maintenance
Drivers and auxiliary equipment require periodic maintenance.
Refer to the manufacturer’s instruction manual for proper installation, operation, and
maintenance.
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