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Series RITZBloc
6. Problems: Causes and Remedies
1) Output low or no output at all
2) Excessive output
3) Motor overload and thermistor stops
4) Water hammer in the system
5) Repeated mechanic damages after short period
1) 2) 3) 4) 5) Problem
Excessive draw-down in sump, excessive
suction lift or inadequate flooded suction
Pump not completely primed
Air lock in suction pipe
Excessive delivery pressure
Insufficient delivery pressure
Wrong rotation
Pipework, fittings or pump clogged
Pump internal worn
Speed too low
Speed too high
Motor two phasing
Set misaligned
Excessive density of pumped medium
System design
System default
7. Appendix
7.1
Permissible pump pressure
Type
32-125 to 100-250
100-315 to 150-400
* The maximum permitted final pump pressure (bar) consists of the intake pressure and the pump delivery head at zero capacity.
Maximum admissible final pump pressure* [bar]
pump media temperature -20°C to +110°C
casing parts made of
EN-GJL-250
10
10
Remedy
• Check the system design and pipe sizing
• Check the settings and operation of level controls
• Vent the pump
• Check shaft sealing arrangements for air tightness
• Prime the suction pipe
• Check suction pipework and valves for air tightness
• Open up restricting valves
• Check system design for excessive pressure losses
• Modify pump (after consulting the manufacturer)
• Check the system design
• Restrict discharge valve
• Correct rotation
• Remove deposits or obstructions
• Replace worn parts
• Check electrical installation
• Check electrical installation
• Check electrical installation
• Check alignment
• Eliminate loads from pipework and realign set
• Fit a more powerful motor (after consulting the manufacturer)
• Examine system design, remedy the cause
• Fault diagnosis after inspection
pump media temperature +110°C to +140°C
CuSn 10-C
EN-GJL-250
8
7
Table 3: Problems
casing parts made of
CuSn 10-C
8
6
6
4
Table 4: final pressure of pump
19
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