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Vane Pump Fault Diagnosis

If you are experiencing issues with your Vane Pump, the below guide can help you diagnose any issues, or speak to one of our Technical Sales Engineers:

Problem

Possible Cause

Remedy

Pump does not draw fluid (Prime)

Pump Dry Running

Check fluid level in inlet tank, pump protection, suction line and operating parameters

Valves Worn

Check inlet valves are fully opening

Inlet Valve partially closed or closed

Check inlet valves are fully opening

Pump Drawing Air

Check all pipe connections for Air ingress

Filter Blocked

Clean / Replace filter

Suction Restrictions

Reduce pump speed, replace the pump, increase tank size, move pump closer   to tank

Steam Blockage

Ensure fluid is free from Water, install condensate traps, check for excess vapour entry

Low Pump Speed

Check pump speed on inverter settings and against the original specification

Relief Valve Partially Open, Seized or worn

Check relief valve pressure setting, and operation is inline with design and seating correctly

Reduced Flow & Pressure

Low Pump Speed

Check pump speed on inverter settings and against the original specification

Restricted Suction

Check fluid level in the suction tank, suction line, valves in pipework

Pump Wear

Check Vanes for wear.

Restricted Discharge

Check discharge pipework is fully open, free from blockage and valves are all operational

Relief Valve Operation

Check relief valve pressure setting, and operation is inline with design and seating correctly

Vane Installation

Ensure Vanes are installed correctly and facing the correct way

Direction of Rotation

Check Direction of Rotation

Noisy Pump

Low Inlet Pressure

Check fluid level in inlet tank, pump protection, suction line and  operating parameters

High Pump Speed

Check pump operational parameters in line with the design.

Pump Distance from Fluid Source

Move pump closer to source

Blocked Outlet

Remove blockages and check valves are fully operational

Pump Loose

Ensure Pump is fastened to the baseplate

Pump Worn

Replace worn or damaged bearings, vanes. Check Shaft for misalignment   and ensure motor bearings are serviced / replaced

Pipes not fit correctly

Ensure pipes fitted with relevant accessories (brackets) where   required

Valve Failure

Check valves in the system

Relief Valve Setting

Check relief valve pressure setting, and operation is inline with   design and seating correctly

Vane Damage

Check Vanes for sign of wear and Damage

Damaged Vanes

Solid Entry

Check for the presence of solids in pump

Relief Valve Failure

Check relief valve pressure setting, and operation is inline with   design and seating correctly

Water Hammer

Ensure valves are not being closed too quickly on discharge and that pump speed reduces rather than being abruptly stopped

Misalignment

Check alignment of pump and baseplate

Excessive Wear

Check Vane maintenance procedure and frequency

Solid Accumulation

If pumping matter solidifies within pumps, enforce cleaning/maintenance regime

Leakage

O Ring Failure

O Ring Failure from life, the product being abrasive or incompatible with   O Ring Material. Check Fluid, O Ring Material and presence of particles.

Shaft Wear / Damage

The shaft could be worn and undersized for a mechanical seal and require replacing.

Over lubrication

Bearings could be excessively lubricated

Cavitation

Check inlet pressure

Particle Ingress

Check faces of Mechanical Seal for cracks, notches, scratches, pitting or dirt ingress

Hygienic and food grade pumps

Hygienic liquid applications require special attention as mistakes can have many negative ramifications.

read more about sanitary and food grade pumps

Positive Displacement Pump Repair

As the leading European supplier of positive displacement pumps we are experts in their repair

read more about positive displacement pump repair
PD Pumps Team
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