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Problem
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Possible Cause
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Remedy
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Pump does not draw fluid (Prime)
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Pump Dry Running
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Check fluid level in inlet tank, pump protection, suction line and operating parameters
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Valves Worn
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Check inlet valves are fully opening
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Inlet Valve partially closed or closed
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Check inlet valves are fully opening
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Pump Drawing Air
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Check all pipe connections for Air ingress
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Filter Blocked
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Clean / Replace filter
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Suction Restrictions
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Reduce pump speed, replace the pump, increase tank size, move pump closer to tank
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Steam Blockage
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Ensure fluid is free from Water, install condensate traps, check for excess vapour entry
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Low Pump Speed
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Check pump speed on inverter settings and against the original specification
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Relief Valve Partially Open, Seized or worn
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Check relief valve pressure setting, and operation is inline with design and seating correctly
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Reduced Flow & Pressure
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Low Pump Speed
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Check pump speed on inverter settings and against the original specification
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Restricted Suction
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Check fluid level in the suction tank, suction line, valves in pipework
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Pump Wear
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Check Vanes for wear.
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Restricted Discharge
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Check discharge pipework is fully open, free from blockage and valves are all operational
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Relief Valve Operation
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Check relief valve pressure setting, and operation is inline with design and seating correctly
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Vane Installation
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Ensure Vanes are installed correctly and facing the correct way
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Direction of Rotation
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Check Direction of Rotation
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Noisy Pump
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Low Inlet Pressure
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Check fluid level in inlet tank, pump protection, suction line and operating parameters
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High Pump Speed
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Check pump operational parameters in line with the design.
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Pump Distance from Fluid Source
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Move pump closer to source
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Blocked Outlet
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Remove blockages and check valves are fully operational
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Pump Loose
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Ensure Pump is fastened to the baseplate
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Pump Worn
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Replace worn or damaged bearings, vanes. Check Shaft for misalignment and ensure motor bearings are serviced / replaced
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Pipes not fit correctly
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Ensure pipes fitted with relevant accessories (brackets) where required
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Valve Failure
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Check valves in the system
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Relief Valve Setting
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Check relief valve pressure setting, and operation is inline with design and seating correctly
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Vane Damage
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Check Vanes for sign of wear and Damage
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Damaged Vanes
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Solid Entry
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Check for the presence of solids in pump
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Relief Valve Failure
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Check relief valve pressure setting, and operation is inline with design and seating correctly
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Water Hammer
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Ensure valves are not being closed too quickly on discharge and that pump speed reduces rather than being abruptly stopped
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Misalignment
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Check alignment of pump and baseplate
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Excessive Wear
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Check Vane maintenance procedure and frequency
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Solid Accumulation
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If pumping matter solidifies within pumps, enforce cleaning/maintenance regime
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Leakage
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O Ring Failure
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O Ring Failure from life, the product being abrasive or incompatible with O Ring Material. Check Fluid, O Ring Material and presence of particles.
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Shaft Wear / Damage
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The shaft could be worn and undersized for a mechanical seal and require replacing.
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Over lubrication
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Bearings could be excessively lubricated
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Cavitation
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Check inlet pressure
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Particle Ingress
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Check faces of Mechanical Seal for cracks, notches, scratches, pitting or dirt ingress
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