DV GROUP, the solution for your ventilation and transmission repairs

Industrial fans make it possible to process and condition the air in order to safeguard the working conditions of your employees and your industrial processes.

We work on industrial fans in various branches of industry and across a highly diverse range of applications. We address the passage of air, fumes or gases for the following industrial applications:

  • Air conditioning.
  • Drying and cooling.
  • Dust removal.
  • Pneumatic conveying.

This includes facilities for drying, industrial air conditioning, dust and smoke removal, ventilation of spray-painting booths, and the extraction of combustion gases from boilers and furnaces.

DV Group is equipped with an aerodynamic and acoustic test laboratory.

All fans are tested mechanically before shipment. The temperature of the bearings and vibration measurements are also checked during this test.

Our experience of these repairs allows us to work on many types of fans, including:

    • Axial or helicoid fans.
    • Radial fans.
    • Induced draft fans (ID).
    • Forced draft fans for boilers (FD).
    • Smoke extraction fans.
    • Process air fans.
    • High-temperature fans.
    • High-pressure fans.
    • Stainless steel fans for use in abrasive and corrosive environments
    • Helical roof turrets, centrifugal roof turrets.







engine and ventilation repairs in 2017

experts in engine repair

test benches

Fan repair at DV GROUP

A process that guarantees you a 100% functional product

Technical procedures / test procedures:

Procedure before dismantling

  • Inspect motor connectors.
  • Mechanical inspection: general condition, chamber, blades, bearings, shaft, etc.
  • Electrical inspection (insulation, resistance, etc.).

Repair Procedure

  • Dust removal, degreasing.
  • Volute repair / reconstruction.
  • Metrological check of bearing settings, joint surfaces, flanges, shaft, etc.
  • Repair: chromage, ringing, molten metal refill of the various joint surfaces, complete refill of the motor shaft.
  • Change of bearings / transmission.
  • Alignment: horizontal direct coupling / pulley – belt.
  • Electrical inspection: ageing, pollution: BAKER index, state of winding.

Testing / validation procedure

  • Un-loaded tests in rotation on a platform.
  • In-workshop balancing single plane / multi-plane; 1 axis / 3 axes.
  • Vibratory measure and signature.

Traceability procedure

  • Diagnosis and testing history.
  • Traceability produced by: machine number / customer number / DV GROUP number.
  • Test sheet and qualification/test certificate.

Case study :


Need / Context

Glass producers must rebuild their furnaces every 15 years. The refractory brick component needs to be replaced to ensure its tightness of fit. During this shutdown, the OI Manufacturing site in Ardèche refurbishes the related equipment. Glass production has a reliability requirement, and must be able to ensure long periods without breakdown or maintenance stoppage.


To achieve these availability and efficiency goals, the glass producer entrusts us with the removal, overhaul and refitting of its fifteen 750 KW - 50 Hz medium-voltage fan and compressor motors. For one month (800 hours), our teams from the various electromechanical sites in Grigny, Cambrai and Lyon mobilised to process these products and meet the deadlines imposed by our customer. We added DV GROUP know-how to the flawless organisation demanded by this project. OI Manufacturing has atypical 750 KW - 50 Hz medium voltage motors with plain oil bearings instead of ball bearings. These bearings carry a higher radial load and have a longer life than bearings. However, they require a specific expertise.


- Deadlines met - Furnace restart with products 100% tested and 100% functional


Need / Context

The European Organization for Nuclear Research, commonly known as CERN, is the largest particle physics center in the world. CERN is located in Switzerland, near Geneva. On an ad hoc basis, CERN makes technical stops in order to recondition their equipment. Following the last stop, a lubrication problem on two cooling tower reducers is detected.


CERN wants a SIEMENS / FLENDER agreed repair partner which leads them to contact us. After many exchanges with the customer, particularly about the safety of this kind of repairs, CERN entrusts us with the project. Our customer asked us to overhaul these 2 FLENDER industrial reducers but also to supply and replace the lubrication pump within a period of 4 weeks. For a month, our teams were mobilized to treat these products and meet the deadlines our customer required.


- Deadlines respected - Preparation of a detailed report describing the different operations carried out - Convinced by the results of this first collaboration, CERN wishes to entrust us with the overhaul of 6 to 8 other reducers for the coming years.

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