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Problem
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Possible Cause
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Remedy
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Pump does not start
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Insufficient Motor Power / Performance
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Check Motor Rating, Power, that motor is running operationally sound independently of the pump, Winding resistance. Repair/Replace if necessary
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Insufficient output from Frequency Converter
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Check Frequency converter matches motor
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Pump Blockage
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Check Voltage and current draw. Pump Start occurs at 10Hz
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Pump Blockage
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Check if pump suction or discharge is blocked
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Reduced Flow or Pressure
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Valves on discharge and/ or suction may be closed fully or partially
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Open Valves fully
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Pump Hose Compression too little
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Check number of shims fitted on rollers is correct for pump model
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Hose Rupture / Leakage
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Replace Hose
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Partial Blockage
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Clear Suction and Delivery lines
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Insufficient Inlet Pressure
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Increase level of fluid in the suction tank, replace pump or reduce pump speed
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Inlet Pipework too Small
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Increase Suction Pipe Diameter
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Suction Line too Long
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Ensure Suction line is as short as Possible
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Viscosity of Fluid
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Check it is in line with the original specification. Viscosity may change with temperature.
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Suction of Air
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Ensure Connections are airtight
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Pulsating Suction Line
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Ensure all connections are tight. Use pulsation dampeners to reduce pulsations by up to 98%. Check Application
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High Pump Temperature
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Hose not lubricated
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Lubricate Pump Hose
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Product Temperature High
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Reduce Fluid Temperature
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Poor Suction Conditions or Insufficient Suction
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Check Suction Line for Blockages
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Pump Speed too High
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Reduce Pump Speed
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Vibration on Pump & Pipework
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Connecting Pipework not fastened correctly
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Ensure pipework is connected with accessories such as brackets where required
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Pump speed too high
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Reduce pump speed
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Insufficient pipe bore
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Increase bore of the pipe
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Pump loose on baseplate
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Tighten baseplate
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Pulsation dampeners insufficient or missing
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Install pulsation dampeners on suction & discharge
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Short Hose Life
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Chemical Attack
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Check Hose Chemical Compatibility with liquid pumped, any cleaning agents used and lubricant
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High Pump Speed
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Reduce Pump Speed
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High Temperature
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Reduce fluid Temperature
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High Operating Pressure
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Reduce Operating Pressure
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Cavitation
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Check Suction Conditions including bore of the pipe, tank size, the viscosity of fluid with pump capacity
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Elevated Temperature
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Check Rollers Shaft Mounting
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Unsuitable Lubricant
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Only use Lubricant from North Ridge Pumps
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Insufficient Grease
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Top Up Lubricant
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Pump Hose Pulled into Housing
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High Inlet Pressure >3 Bar
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Reduce inlet Pressure
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Pump Hose contains Deposits
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Clean or Replace Pump Hose
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Holder (press flange) not Tight
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Re-tighten Press Flange and Holder
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Insufficient Grease
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Top Up Lubricant
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