1. The Cost of Crushing Season Downtime – A Burden Sugar Mills Cannot Afford

The operating rhythm of the global sugar industry is dictated by nature. The harvest seasons for sugarcane and sugar beet are highly concentrated – globally, the crushing season typically runs from December to March. During this brief window, sugar mills must operate 24/7 at full capacity, rapidly converting raw materials from the fields into finished sugar.

 

But mechanical failures don't follow calendars. A Norfolk sugar facility in the UK demonstrated this vulnerability when a mechanical failure during peak season caused 30,000 tonnes of beet to be transferred to other factories in the surrounding area. At a leading South African sugar refinery in KwaZulu-Natal, premature bearing failure on a mainline pump caused significant production line downtime.

 

The data from Biscom Sugar Refinery in the Philippines is even more compelling – this 14,000-tonne capacity facility had used double-row spherical roller bearings on its main line conveyor head shaft drives for five years, with each bearing changeout requiring 24 hours of plant downtime. For a large-scale mill processing 14,000 tonnes per day, 24 hours of lost production represents losses in the tens of millions or even hundreds of millions of yuan.

 

The reality for Southern African sugar mills is even more stark – many mills shut down for the off-crop period from December to March and crush cane non-stop for the rest of the year. This means that if a bearing failure occurs during the peak production season, the entire sugar mill could come to a standstill.

 

2. Why Traditional Solid Bearings Are "Too Expensive to Replace"

Sugar mill equipment operates under what can only be described as "bearing-killer" conditions: acidic corrosion from sugarcane juice, syrup temperatures exceeding 80°C, sustained high humidity, high concentrations of dust, and heavy impact loads. However, what truly costs sugar mills dearly is not just bearing service life – it's the time required to replace a bearing.

 

The traditional solid bearing replacement process: shutdown → disassemble couplings → remove motor → remove gearbox → move shaft → slide on new bearing → realign → reassemble → recommission. Sugar industry experts in South Africa note that a solid bearing can take up to 24 hours to remove. And most of those 24 hours are spent on disassembling and reassembling auxiliary equipment – motors, gearboxes, couplings, frames – not on the bearing itself.

 

What makes it even more frustrating is equipment location. Conveyor bearings are often trapped between the drive motor and gearbox. The advantage of split bearings is especially valuable in hard-to-reach or trapped places. Operating heavy lifting equipment in confined spaces is not only time-consuming but also presents safety hazards.

 

"Solid bearings still predominate, largely because they are initially cheaper to purchase" – as industry publication DPA Magazine points out. But this short-sighted cost perspective ignores the overall lifetime costs. When a single bearing replacement requires 24 hours of downtime, the price difference of the bearing itself is negligible compared to the capacity loss.

 

3. NMT Split Bearings – From 24 Hours to 1 Hour

The core design logic of NMT split bearings is remarkably simple: the inner ring, outer ring, rolling elements and cage are all split along the axial direction. Installation is completed directly on the shaft in situ, without removing the shaft, couplings, gearboxes, motors or any other core components.

 

▸ No-Shaft-Removal Installation – No Motor Removal, No Coupling Removal, No Heavy Lifting Equipment

 

Split bearings are totally split to the shaft – a design that both simplifies and expedites installation and cuts installation downtime by up to 90%. There is no need to lift the shaft, or obtain access to the shaft ends. Therefore, expensive and awkward to handle lifting equipment is not required. This intrinsic feature is extremely valuable for all applications, and especially regarding large machines, where sheer size and weight can be a barrier to fast and effective servicing.

 

The Biscom Sugar Refinery case is the best proof. Engr. Genaro Escarro, Mill Department Head for Biscom, commented: "Shutting down the plant for 24 hours every time a conveyor bearing needs replacing isn't sustainable – we needed an alternative." After trialing one NMT (Bowman) high-capacity split bearing unit, the technician removed the solid bearing and installed the new split bearing in just one hour – saving 23 hours of downtime. After an initial assessment period, the Biscom team confirmed the split bearing was up to the challenge and subsequently ordered further units for all their main line conveyor head shaft drives.

 

Data from South African sugar mills is equally compelling: a solid bearing can take up to 24 hours to remove, while a split bearing can usually be changed in under two hours.

 

▸ Interchangeable with Standard Heavy-Duty Solid Bearings

 

NMT split bearings have outer diameters and outer ring widths identical to standard spherical roller bearings (222, 230, 231, 239, 240, 241 series). Standard bore ranges from 55mm to 630mm, with inch shaft diameters from 2 inches to 16 inches. Sugar mills commonly use shaft diameters exceeding 1000mm on the diffuser shaft alone.

 

▸ Full Split + Heavy-Duty High-Temperature Corrosion-Resistant Construction

 

Every component is split – split inner ring, split outer ring, split cage with rolling elements, split seals. NMT offers a complete impact-resistant and corrosion-resistant steel system for sugar industry high-temperature, high-humidity, corrosive media conditions – carburized bearing steel with deep-case hardening achieves uniform surface hardness HRC60-64 while the core maintains sufficient toughness to absorb impact loads.

 

4. Full-Scene Coverage – From Shredders to Centrifuges

NMT offers a complete split bearing product system covering the entire sugar processing flow, supporting both cane and beet sugar processing:

 

Cane Shredders and Knives: Shredders endure high-speed intermittent heavy loads and significant radial impact forces. NMT split spherical roller bearings have inner rings, outer rings and cages with rollers all split in half – spherical outer ring raceways and barrel-shaped rollers provide self-aligning capability. Standard shredder bearings typically last two seasons, while high-performance series can last up to four.

 

Mills and Rollers: Sugar cane mill roller journal diameters can reach 300mm-650mm. NMT offers "split + flanged bronze bearing" configurations for load distribution stability and reduced failure risk.

 

Sugar Conveyors: Conveyors (cane conveyors, bagasse conveyors, sugar bag conveyors) operate in harsh environments with process water, heat and food debris constantly affecting performance. NMT split bearings are specifically designed for conveyor drive and bend pulleys.

 

Centrifuges and Separators: Continuous centrifuges experience accelerated bearing wear from screen basket imbalance. NMT split bearings enable bearing replacement without removing the screen basket or main shaft.

 

Other Sugar Applications: Including cane knives, beet slicers, drum processor trunnions, crystallizers, granulators, stone trap separators, reciprocating screens, lime kilns, rotary mixers and conditioners.

 

5. Specialized Sealing System – A Protective Barrier Capable of Fully Submerged Operation

Sugar processing equipment operates year-round under harsh conditions of high temperature, high humidity, cane juice, syrup and dust. NMT's sealing system is specifically designed for these conditions:

 

Fully Submersible Seal Design – Split bearings feature two lip seals with garter springs and retaining plates, with central positive grease feed between each seal. The positive action of the grease purge between the two high-performance seals offers consistent and reliable long-term operation. Even when completely submerged, water and contaminants are effectively excluded.

 

Split Seals – Seals are also split for installation without shaft threading, assembled simultaneously with the bearing.

 

"Good sealing arrangements translate into long service life" – some Cooper split bearings in South African sugar mills have not been replaced for decades.

 

6. Quality Control and Supply Assurance

NMT implements a strict quality control system for sugar industry split bearings: each batch of bearing steel undergoes impact load testing and hardness inspection; high-precision wire cutting for inner and outer ring split surfaces ensures concentricity and strength after assembly; high-strength steel clamp rings and multiple bolts ensure split surfaces remain secure during operation; each batch undergoes high-temperature high-humidity and syrup environment seal testing.

 

Common split spherical roller bearings and split cylindrical roller bearings are kept in stock. Due to long lead times for extra-large bearings – typically 12 to 18 months – pre-stocking split bearing spares can dramatically shorten emergency downtime.

 

Imperial Size Availability – Many sugar mills were built over 50 years ago using imperial standards. NMT stocks both metric and imperial-sized split bearings for direct replacement without modifications.

 

Custom solutions available: special bore/OD/width (standard range 55mm to 1000mm+), custom heavy-duty materials, special split configurations, custom sealing solutions, custom clearance, split housed bearing units. Rapid customization from samples or drawings. Cost-effective replacement for imported brands.

 

7. Lifecycle Cost – What You Save Is Not Bearing Price Difference, But Production Line Shutdown Risk

"Solid bearings still predominate, largely because they are initially cheaper to purchase" – but this is changing. More and more sugar producers are adopting a lifecycle cost perspective when selecting bearings.

 

The lifecycle value of NMT split bearings:

 

First, downtime reduced by over 90% – from 24 hours to 1-2 hours. Biscom Sugar Refinery saved 23 hours of downtime per replacement.

 

Second, no motor or coupling removal – drive systems stay in place, avoiding secondary damage and realignment.

 

Third, no heavy lifting equipment required – bearings are handled in sections – no large cranes or wall removal.

 

Fourth, heavy-duty steel withstands high temperatures and harsh environments – carburized bearing steel and deep hardening resist impact loads and high temperatures.

 

Fifth, superior sealing for syrup and cane juice environments – fully submersible seal design.

 

Sixth, improved worker safety – simplified installation reduces exposure time at repair sites.

 

Seventh, extended life of equipment (motors, gearboxes, couplings) – fewer disassembly cycles – longer overall equipment overhaul intervals.

 

For sugar producers, what you save is not bearing price difference, but the enormous operational risk and crushing season capacity loss of "replacing one bearing, shutting down an entire production line."