Water Monitoring System
Ver.5.0 – Revision March 2022
Page
65
of
110
Trouble
Possible Cause →Action
Reduced flow or
pressure
→ Valves on discharge and/ or suction side completely or partially
closed → open valves.
→ Pump suction pressure is low → check pressure improves
hose/routing.
→ Partial blockage of the suction line → clean pipe.
→ Insufficient diameter on the suction side → increase the diameter
on the suction side, as much as possible.
→ Suction line too long → shorten the suction line, as far as possible
→ High viscosity of medium →reduce viscosity, as far much
possible. Reduce speed and reconsider application.
→ Air introduction in the suction connections → check connections
and accessories for air tightness.
Vibrations on pumps and
pipelines
→ The pipes are not correctly fastened → fasten pipes correctly (e.g.
wall brackets).
→ Pump speed too high → reduce pump speed
→ Insufficient nominal width of the pipes → increase nominal width.
→ Pump base plate loose → Fasten base plate
Hose pump: Reduced
operational lifetime of
the hoses
→ Chemical exposure → Check the compatibility of the hose with
the liquid being conveyed, the cleaning fluid and the lubricant. If in
doubt always consult the manufacturer.
→ Wrong pump rotation direction → inlet must be at the top
connection and outlet must be at the bottom connection.
→ High pump speed → Reduce pump speed
→ High conveying temperature → Reduce product temperature. If
in doubt always consult the manufacturer.
→ High operating pressure → Reduce operating pressure. If in doubt
always consult the manufacturer.
→ Pump cavitation → Check the suction conditions.
If in doubt always consult the manufacturer.
→ Abnormal elevation of temperature → Check rollers shaft
mounting.
→ Unsuitable lubricant → consult the manufacturer
→ Insufficient lubrication → Lubricate hose with original lubricant.
