In cement manufacturing operations, reliability is a never ending concern. Equipment is routinely exposed to abrasive dust, vibrations, heat, and continuous operation – conditions that place significant stress on a variety of components. Bearings in particular play a critical role in maintaining uptime and failures often result in unplanned shutdowns, increased maintenance labour, and lost production.
As plants seek to improve their operation through efficiency and cost control, maintenance and reliability teams are reassessing how bearing design, installation practices, and contamination protection work together to affect overall performance.
The role of bearing design in cement applications
Spherical roller bearings are commonly used in cement plants for their ability to accommodate misalignment while also supporting heavy radial and thrust loads. However, depending on the environment, not all spherical roller bearings perform equally. Factors linked to housing design, mounting methods, sealing operations, and internal geometry can significantly influence bearing life.
Traditional split-housed bearings, while widely adopted in the market, often require onsite assembly and clearance setting. In cement plants, this process can easily expose internal components to fine particulate contamination and introduce variability during installation – both of which can shorten bearing life. Additionally, vibration, which is another frequent challenge, can further impact bearing retention and stability if mounting systems loosen over time.
Reducing installation variability and maintenance exposure
Modern adapter-mounted bearing designs aim to reduce the main challenges when it comes to bearings in these applications. Single-piece housings with factory-preset clearances and lubrication help to eliminate onsite adjustments and limit exposure to elements during installation. Additionally, adapter sleeve mounting systems simplify installation and removal while allowing the use of commercial-grade shafting which helps reduce both labour and material costs.
Additional features – like the positive locking systems, oversized rollers, and enhanced misalignment capabilities – help bearings maintain performance under fluctuating loads, structural movement, and vibration, which are all common in cement operations.
Research in action: solving an issue with a high-speed kiln fan
The above considerations were put to the test at a cement plant in Indiana experiencing chronic bearing failures on the high-speed fan which moved air through their rotary kiln. The fan operated within 2000 – 2500 RPM, driven by a 150 HP motor, and was supported on a 2-15/16-in. straight shaft with 20 in. bearing centers.
The previously installed split-housed bearings had routinely failed in three months or less, which caused immense frustration and led to more frequent repairs than expected. Additionally, tight installation spacing made proper assembly difficult, and fine cement dust contaminated the lubricant during installation. Fan-induced vibrations also caused lock nuts to loosen over time leading to improper bearing fit, accelerated wear, and premature failure.
Solution and performance results
After some considerations and consultations, the plant chose to address these challenges by replacing the existing units with Rex 6000 Series SHURLOK adapter mounted roller bearings. The SHURLOK bearings’ single-piece housing and factory-preset clearances and lubrication eliminated the need for onsite adjustments and reduced exposure to harmful cement dust during installation.
Furthermore, the tapered adapter sleeve design provided up to 25% greater shaft grip compared to traditional adapter-mounted bearings, helping maintain secure mounting in a high-vibration environment. In addition, the bearings’ positive locking system helped minimise vibration-related loosening, reducing the need for routine checks and corrective maintenance.
These SHURLOK bearings also provided enhanced misalignment capabilities – up to twice the industry-standard static and dynamic limits – and oversized rollers allowed the bearings to handle the application’s combined loads while extending service life.
The lasting impact of upgraded bearings
In these volatile environments where dust, vibration, and continuous operation are unavoidable aspects of the jobsite, bearing solutions that reduce installation variability and can resist contamination deliver meaningful reliability gains. As this high-speed fan application demonstrates, selecting a robust and intentional bearing with sealed, factory-assembled construction and secure mounting can significantly reduce downtime while improving long-term performance and maintenance efficiency.
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