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What is In-situ Fan Balancing?

In-situ Fan balancing is a procedure that enables the correction of unbalance in rotating equipment, whilst the machine is in its working environment.

Why Perform In-situ Fan Balancing?

Along with misalignment, unbalance causes more premature and catastrophic failures in rotating machinery than any other fault.

Benefits of In-situ Fan Balancing


Eliminates the requirements to completely dismantle and reassemble plant equipment to enable balancing of machine components


Improves product quality


Reduces downtime, labour and material costs


Can be planned into scheduled short time outages e.g. machine mould or process changes


Extends bearing and machine life


Reduces the possibility of catastrophic failures


Increases safety

Why use Vibrotech Reliability Services

  • Over 40 years experience in the field of in-situ balancing
  • Vibration Analysis, pre-balance tests are standard to confirm causes of vibration prior to starting any correction work
  • Ability to In-situ Balance banks of equipment whilst adjacent machinery is still on line i.e. Fans, Pumps & Centrifuges
  • Equipment capability enables In-situ Balancing of Turbines, Generators, Overhung Fans, Cylindrical Rolls & Multi Stage Components

In-situ Balancing Customers

We are very proud to count National Maintenance Companies, and Original Equipment Manufacturers OEM’s, to whom this service is essential in their after sales service, amongst our customer base. OEM’s include International Generator, Motor, Gearbox and Cooling Tower Manufacturers.

In-situ Balancing, Vibration Analysis, Laser Alignment and our Thermographic services are provided throughout the UK, Overseas and Offshore.

We carry out in-situ balancing throughout the UK, as well as covering the whole of England we have customers in Scotland, Northern Ireland & Wales.

We can carry out our vibration and in-situ balancing service throughout the world. Opposite is a case history of work carried out for Crown Beverage Can Jeddah in Saudi Arabia, who’s cans are used as part of the manufacture of Coke Cola drinks.

As well as our in-situ balancing service, we can provide all our services offshore. We have a number of analysts with the required qualifications to work offshore. A case history report can be found on the vibration analysis page.

In-situ Fan Balancing vs Machine Fan Balancing

It is common practice to remove a rotating element from a machine for machine balancing. Occasionally this may yield poor, even worse than original, unbalance vibration. This does not necessarily mean the rotor has been incorrectly balanced; it may simply be caused by the differences between test stand and operating conditions.

A shop balancing machine will have different bearings, stiffness and structural response, therefore machine balancing cannot duplicate the actual machine “system” and it’s response. For these reasons, including time, cost and convenience, the in-situ balance method is often the preferred option.