Vibrotech Reliability Services Limited Unit 12, Roseberry Court Ellerbeck Way Stokesley North Yorkshire TS9 5QT Tel: (01642) 714710 Fax: (01642) 713664 E-mail

In-situ Fan Balancing

Why Perform In-situ Fan Balancing?

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

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.

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 30 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 have recently completed work after a request from a national maintenance company to in-situ balance a 30MW generator rotor in a Waste to Energy Plant in the midlands.
This year we have completed several trips overseas at requests of OEM’s to carry out In-situ Balancing. One during the commissioning of a 30MW generator.
An In-situ Balance was carried out after the fitting of a new exciter to a 40MW Generator on an offshore oil platform. This was carried out on behalf of an OEM as part of an after sales service.

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.

In-situ Fan Balancing