Fiberglass Fans (FRP)
When it comes to corrosive applications, there are a few options available, but fiberglass reinforced plastic fans are a common solution.
Fiberglass, also referred to as FRP (fiber-reinforced plastic), is a composite material made of a polymer matrix reinforced with glass fibers.
The corrosion-resistant properties of fiberglass are wide-ranging and suitable for use across the ph scale. In addition to its corrosive properties, FRP provides a lighter and more cost-effective alternative to its metal counterparts.
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They can be used for general ventilation or incorporated into process ventilation. With the standard general-purpose resin, a fiberglass fan can be used with a wide range of chemicals, but in extreme cases, other resins and coatings can be used to improve the construction and duty point.
The applications are endless.
There are, however, limiting factors to consider, such as temperature and abrasion. A fiberglass fan can only work at moderate temperatures, which can change depending on what chemicals are in the airstream. These temperatures can vary from just below 100°F to just above 200°F.
These fans are also limited to gaseous airstreams and do not hold up well against airstreams that contain solids or anything that could be deemed abrasive.
Fiberglass fans made of a plastic composite are best for getting rid of corrosive gasses and mists in the air, which are common in some applications.
Corrosive gasses and mists in toxic environments cause ventilation equipment to wear out and get damaged faster, which causes the equipment to break down sooner.
The use of FRP ventilation equipment in corrosive environments provides a safe solution that will operate for a long time.
Corrosive environments contain gasses and compounds such as:
Benefits of FRP Fans
Fiberglass Fan Manufacturers
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Difference between FRP, PVC & PP
In addition to fiberglass, there are a couple of other plastic composite options to consider for corrosive applications. PP (polypropylene) and PVC (polyvinyl chloride). Your decision will be based on the severity of the application.
The most severe applications are best suited for FRP, or fiberglass-reinforced reinforced plastic. FRP can handle the highest temperatures, the highest pressures, and the widest variety of contaminants of all the options.
FRP will also be the strongest construction as it includes layers of fibers within the construction, creating strength.
PVC is another great option for corrosive applications. These fans are suited for many of the same applications as FRP but will be limited by pressures, environments, and temperatures.
PP (Polypropylene) is also a great option for corrosive-duty applications. These fans are suited for many of the same applications as FRP but will be limited by size, air volume, pressures, environment, and temperature.
How are FRP Axial Fans Constructed?
The axial fans are fitted with fiberglass-reinforced plastic (FRP).
The fan is then coated with a resin that is fire retardant. The components, such as the bearings, drives, and fan shaft, are protected from corrosion in a couple of ways.
Some styles will use an airtight enclosure while others will draw fresh air from outside the fan across the components. This ensures that corrosive fumes are not able to reach the moving components.
A gasketed access panel can be added so that the internal parts can be inspected and maintained. To prevent fumes from escaping the drive opening, a shaft seal is applied to the opening around the shaft.
Several considerations are made in order to reduce maintenance. The most important is bearing lubrication, which is served by lubrication lines that run to the exterior fan housing.
Another is properly sizing the shaft and bearings for performance and speed. This is performed to increase the fan’s lifecycle as well as reduce maintenance. To isolate the motor from the airstream, the motor is placed outside of the airstream on an adaptable epoxy-coated steel base.
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