Vogelsang VX Series, Manual

Page: 193 / 202

Service Manual
Service Manual
Pump Models:
VX Series Q Pumps
2.F.5 Troubleshooting
No
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Causes Solution
X
Incorrect direction of
rotation
Reverse Motor
X
Pump not primed
Expel gas from supply
line and pumping
chamber to introduce
liquid.
X X X X X
Insufficient NPSH
available
Increase supply line
diameter. Increase
suction head. Simplify
piping and/or reduce
length. Reduce pump
speed. Decrease liquid
temperature. Check
effect of increased
viscosity on available
and permitted power
inputs.
X X X X
Product vaporizing in
supply line.
X X X X X
Air entering supply line. Remake pipe work
X X X X Gas Supply
Expel gas from supply
line and pumping
chamber to introduce
liquid.
X X X X X
Insufficient head above
supply vessel outlet
False product level.
Lower outlet position.
Increase submergence
of supply line.
X X X
Foot valve strainer
obstructed or blocked.
Service Fittings.
X X X X X X X
Liquid viscosity above
rated figure. Decrease pump speed.
Increase liquid temp.
X
Liquid viscosity below
rated figure. Increase pump speed.
Decrease liquid temp.