Reducing Impeller Diameter
Reducing Impeller Diameter
(OP)
Hi Guys!
I have to reduce an impeller diameter. Should I cut both vanes and shroud or only the vanes. My thinking is only the vanes are to be reduced, maintaining impeller to cut water original clearance (Gap B).A strange school of thought has surfaced viz; that reducing the shroud eliminates unbalance that may be present due to heavier mass in the impeller.
I have to reduce an impeller diameter. Should I cut both vanes and shroud or only the vanes. My thinking is only the vanes are to be reduced, maintaining impeller to cut water original clearance (Gap B).A strange school of thought has surfaced viz; that reducing the shroud eliminates unbalance that may be present due to heavier mass in the impeller.





RE: Reducing Impeller Diameter
offers this advice,
Going the Big Inch!![[worm] worm](https://www.tipmaster.com/images/worm.gif)
http://virtualpipeline.spaces.msn.com
RE: Reducing Impeller Diameter
It has been published that it is possible to increase pump heads at reduced flow rates (toward shut-off), by either removing part of the shrouds, or by opening -specifically located- slots on the shrouds.
RE: Reducing Impeller Diameter
You have used the plural - vanes - so I assume it is an enclosed impeller but -
Is it a process / water pump or a slurry pump etc
Is it and end suction overhung impeller with pump-out vanes on the rear shroud.
Is it a single suction between bearings design.
or is it a double suction between bearing design.
All factors for consideration.
Naresuan University
Phitsanulok
Thailand