Radial & axial fans

Over thirty selected series of fans form the basis company’s know-how and expertise thanks to the great experience, flexibility and skill of the technicians to ensure the best solution to customers’ needs. Boldrocchi today is the oldest Italian manufacturer of fans. Well over the 80% of fans produced are special designs and almost all are for industrial applications.


Boldrocchi spans over a wide range of fan types, used in all industrial applications. The growing importance of these machines marked the steps of a continuous and quick technical evolution, to which the Company has perfectly adapted in terms of design and manufacturing capabilities. For instance, with the recent acquisition of the technical and production know-how of Aeroto, De Cardenas and Marelli Ventilation Companies, Boldrocchi became an outstanding supplier, not only in Europe, in the heavy duty fans field. Synergies with Aeroto Dept. for acoustic treatment and with Boldrocchi Ecologia for gas dedusting are another strength point of Boldrocchi fan production.


The product range is very wide and embraces radial fans, blowers and axial fans.

- Radial fans with flow rate exceeding 1,000,000 m3/hr

- High speed fans with tip speeds up to 250 m/sec

- Heavy-duty applications up to 3,000 KW installed power

- Static head up to 40,000 Pa single stage blower and more with multistage

- Axial fans with fixed, adjustable and self variable pitch; single and multistage

- Hot-gas circulating fans up to 850°C

- Special blades design, such as air foil profile, to ensure very high efficiency and low power absorption

- Very special designs for specific purposes such as chlorine processing and compressing steam

Finite elements and stress analysis are provided for high speed and performance impellers and shafts. Boldrocchi can provide a wide range of accessories specially adapted to the various designs and applications of industrial fans: compensators, valves, dampers, special drive systems, acoustic enclosures.

Depending on the type of medium to be conveyed, the running temperature and the impeller stress, the materials used are chosen to ensure the best solutions:

- A range of chrome-nickel steel up to titanium is used for protection against corrosion
- Special low alloys steels with high yield points are supplied for stressed applications
- Stainless steel and special alloys such as: Inconel, Incolloy, Hastelloy and Uranus for high temperatures
- Rubberized, plastic and fiber glass coated, hot galvanized steel are available
- Very light solutions with highly resistant aluminium alloys, welded and cast form impellers
- Special wear resistant design with armored impellers

Performances, vibrations and acoustic tests including, if necessary, simulation of service conditions such as high temperature, low pressure, seismic, over speed, leakage and others, are an essential part of ensuring the highest quality of each product.

Radial Fan

Axial Flow Fan
  • For industrial application
  • Variable pitch blades
  • Flow rate : up to 600 m3/s
  • High efficiency
  • Pressure : up to 80 kPa
  • Use of special materials
  • Shaft power : up to 8.000 kW
  • Temperature : up to 850 °C
  • Tip speed : up to 300 m/s
  • Use of special materials
  • Gas tightness for special fluids
  
  • Wear and corrosion design
  


Some examples of application fields for our fans are:


- Forced draft fans, primary and secondary air fans, gas recirculation fans, induced draft fans for power boilers, deNOx/deSOx systems
- Forced draft fans, primary and secondary air fans, induced draft fans for incinerating plants
- Fans for hydro cracking, ethylene, ammonia and urea, chlorination, methanol, alumina plants, etc.
- Raw mill fans, kiln primary air fans, kiln exhausters, filter exhausters, final exhausters, grate cooler fans, clinker grate exhausters, cement mill fans, coal mill fans, separator fans. Turn key plants and filters can be supplied in cooperation with Boldrocchi Ecologia
- Supply and exhaust fans for compressor room, for evaporators room, for purifier room (combustion and cooling air), for diesel generator (combustion air), for propulsion electric motor, for battery room
- Combustion air fans, boosters, exhausters for: EAF, LD converter, sinter plant, stock house, continuous casting, Coluper, etc. Turn key plants and filters can be supplied in cooperation with Boldrocchi Ecologia.