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Specifying High-Temperature Industrial Fans

  • January, 2022
  • Alfa Fans
  • BLOG

In a high-temperature manufacturing environment, failure of an

industrial fan

can have a ruinous effect on operations. To specify an industrial fan for maximum service life, it's important to understand factors impacting industrial fans design and construction.

Whether it's optimizing the blend and temperature of a chemical composition in a petrochemical factory, regulating process conditions in an essence furnace, or simply circulating hot air through an industrial bakery roaster, fansplay a critical part in numerous manufacturing operations. It should come as no surprise, also, that failure of these fanscan have dire consequences. This is especially true with high-temperature operations, given that, when an industrial fan fails, the system generally needs to be shut down. Once a replacement industrial fan is installed, the system may take many days to reach its optimum temperature, resulting in significant productivity loss.

The key to icing proper selection and construction of an industrial fans for a high-temperature environment is good communication between the consulting mastermind or end stoner and the manufacturer by way of the specification. This composition will bandy important considerations that go into the selection and construction of industrial fans for a high-temperature environment.

There's no formal description of a high-temperature addict. Most

industrial fans manufacturers

, still, consider high-temperature industrial fans to be an industrial fansable of opposing operating air- sluice temperatures 250 °F ( roughly 120 °C) and advanced. Air- sluice temperature is the temperature of air/ gas inside of an addict; it's different from ambient temperature, or the temperature of the air girding the motor, comportments, and external accessories of industrial fans. It's important to understand how these two temperatures impact the design of an addict.

High- Temperature Air Aqueducts, Nonstop Operation

A high-temperature industrial fan can fail in a number of ways.

Wheel failure : Wheel failure can be substantiated by not only breakage, but deformation. One of the main contributing factors is thermal creep. Industrial fans manufacturers regard for thermal creep through proper selection of the accoutrements of construction of air- sluice factors

For temperatures lesser than °F (843 °C), numerous

industrial fan manufacturers

in India use special casting blends to reduce welding and alleviate issues caused by thermal creep. Frequently, this increases both costs and lead time.

Though shrouded bus with airfoil, backward-twisted, or backward-inclined blades are the most effective, they generally have an outside-temperature capability of 900 °F (482 °C). For advanced temperatures, forward-twisted , propeller, or radial- blade fans typically are recommended, depending on the operation. As temperature increases, the maximum speed of these fans frequently isderated.However, it's important to check with the industrial fans manufacturer to avoid wheel or shaft failure, If you plan to increase operating temperature or industrial fan speed.

Shaft failure. As with bus, the most common mode of failure with shafts is bending or breaking. Shaft accoutrements of construction vary grounded on temperature, industrial fan speed, industrial fans arrangement, and cargo. The system by which a shaft is cooled also is important. The most generally used types of shafts are Solid shafts with heat slingers, for temperatures up to 900 °F (482 °C) ( Figure 5). Air- cooled shafts with heat slingers, for temperatures from 900 °F to °F (482 °C to °C) . Water- cooled shafts with heat slingers, for temperatures above °F (above °C) ( Figure 7). Frequently, the bending of a shaft will beget bearing failure and vibration before the shaft fails fully.

Bearing failure. Depending on the cargo and industrial fans speed, the selection of comportments for high-temperature fans is analogous to that for traditional fans— that is, tone-aligning ball comportments or globular comber comportments. The main difference is that, in the case of utmost high-temperature fans, comportments with C3 internal concurrence and applicable lubrication are used. Lubrication volume and type are dependent on bearing temperature.However, the lubricant will lose density and beget bearing failure, If bearing temperature exceeds a lubricant’s rated temperature. When replacing lubricant, check with the industrial fansor bearing seller.

Drive arrangement. ANSI/ AMCA Standard 99, Norms Handbook, prescribes drive configurations for different types of fans. With high-temperature fans, the comportments must be outside of the air sluice. For these fans, also, Drive Arrangement 1 (two comportments mounted on a pedestal and the wheel overhung to one side), 2 ( analogous to Arrangement 1, except the bearing pedestal is supported by the industrial fanscasing), 8 ( analogous to Arrangement 1, but with a lower “ outrigger” motor or turbine base connected to the bearing pedestal), or 9 ( analogous to Arrangement 1, but with the motor mounted on the addict, rather than on the “ bottom”) generally is recommended. For double- range fansor operations taking Drive Arrangement 3 (a bearing type- mounted on each side of the casing or wheel), a bay box with the comportments outside of the air sluice is recommended . The extended shaft length demanded to regard for the bay boxes frequently presents a design challenge, still.

Operations of High-Temperature fans

Depending on a fan's intended use, the quantum of time the industrial fans can be anticipated to be exposed to high-temperature air can vary. Therefore, an industrial fans can be rated for a short, defined duration or it can be rated for nonstop operation.

Take, for illustration, main ventilation fans and spurt fans used in a thruway or conveyance lair . Because their purpose is to void air in the event of a fire, these fans are rated for a short duration, typically 1 or 2 hr. Most other fans, similar as those for petrochemical processing and those for forced rotation or recirculation of air or gas in furnaces, ranges, kilns, and dryers, are rated for non stop operation.


Most high- temperature operations have unique conditions that can make industrial fan specification complicated. The key is relating the system information the industrial fans manufacturer needs to design and supply a product optimized for the operation.

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