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Drawing & Photos Imp. RPM Q[m3/h] °C d[Kg/m3] Impeler DN Pressure [bar] Static

Drawing & Photos Imp. RPM Q[m3/h] °C d[Kg/m3] Impeler DN Pressure [bar] Static Suction Head (hs) Static Discharge Head (hd) D. Insufficient Discharge Pressure E. Short Bearing Life C. Intermittent Operation F. Short Mechanical Seal Life B. Insufficient Capacity G. Vibration and Noise A. No liquid delivery H. Power Demand Execessive Type Possible Causes Nr. A B C D E F G H Possible Solutions Pump is cavitating (Symptom for liquid vaporizing in suction system - Horizontal Pumps) 1 2 1 1 9 1 # Check NPSHa ( Net Positive Suction Head Available ) / NPSHr (Net Positive Suction Head Required ) Margin ; # If pump is above liquid level,raise liquid level closer to pump ; # If liquid Is above pump, Increase liquid level elevation ; Pump not primed (air in system) 2 1 2 # Fill Pump & Suction Piping.Complete with liquid; # Eliminate high points in suctions; #Remove all non-condensibles (Air from Pump, piping and valves); # Eliminate High piping; # Check for faulty foot valve or check valve. Non-Condensibles in Liquid 3 4 2 3 1 # Check for gas/air ingress through suction system/piping; # Install gas separation chamber. Supply Tank Empty 4 3 # Refill supply tank Obstruction In lines or pump housing 5 9 7 7 # Inspect and clean Strainer Partially Clogged 6 3 # Inspect and clean Pump Impeller Clogged 7 8 8 5 # Check for damage and clean Suction or/& Discharging Valve(s) Closed 8 9 # Check Down & Open Valves Viscosity too High 9 7 5 4 # Heat up Liquid to reduce viscosity; # Increase the size of discharging piping to reduce pressure loss (if possible); # Use larger driver or change type of pump; # Slow pump down Specific Gavity to High 10 2 # Check design specific gravity Total System Head Lower than Design Head of Pump 11 4 11 # Increase system resistance to obtain design flow; # Check design parameters such as impeller size , etc.. Total System Head Higher than Design Head of Pump 12 6 5 4 10 2 # Decrease system resistance to obtain design flow; # Check design parameters such as impeller size , etc.. Unsuitable Pumps in Parallel Operation 13 7 6 6 # Check design parameters Improper Mechanical Seal 14 1 # Check mechanical seal selection Speed to High 15 1 # Check Motor voltage - slow down driver Speed to Low 16 4 4 2 # Drive problems. Consulting drive parameters Worng direction of rotation 17 5 3 6 # Check rotation with arrow on casing if existent- Reverse polarity on motor Impeller installed backward (Bouble suction imp.) 18 10 12 # Inspect & correct Misalignment 19 1 2 4 7 # Chec angular & Parallel Alignment between pump & driver Casing disorted from execissive pipe strain 20 2 3 5 # Check for misalignement # Check pump for wear between casing and rotating elements; # Analyze piping loads. Inadequate grouting of base 21 6 # Check grouting & regrout if required. Bent Shaft 22 3 4 7 8 # Check deflection (should not execeed 0.002"). Replace shaft & bearings if necessary Internal Wear 23 8 9 # Check impeller clearances Mechanical Deflects Worn, Rusted, Defective Bearings 24 5 8 10 # Inspect part for deflects - Repair or Replace.Use bearing troubleshooting guide ; # Check lubrication procedures. Unbalance - Driver 25 5 7 9 # Run Driver disconnected from pump unit-perform vibration analysis. Unbalance - Pump 26 4 6 3 # Investigate natural frequency Electric Motor Problems 27 6 8 10 11 # Consult Electric Motor Troubleshooting Guide For vibration & short bearing life related causes , refer to special sections on bearing failure troubleshooting guide & vibration diagnostics Note(s): Running & Control Parameters Troubleshooting Guide Asset Family CENTRIFUGAL PROCESS PUMPS Applicable Asset(s) R342;R344;R765;R877;R98 Set Value Failure Modes (Symptoms) Mechanical System Suction Problems Hydraulic System uploads/Voyage/ troubleshooting-guide 9 .pdf