1. The “Underwater Dilemma“ of Bearing Replacement in the Water Treatment Industry

The water treatment and environmental protection industry is the infrastructure lifeline for urban operation and the ecological environment. Municipal wastewater treatment plants, industrial effluent treatment stations, water supply plants and recycled water facilities require long-term uninterrupted continuous operation. Critical equipment such as lift pumps, aerators, clarifiers, sludge dewatering, screeners and conveyors operate year-round under extreme conditions of high humidity, corrosive gases, sewage immersion and continuous heavy loads.

 

Compounding the challenge – a large portion of water treatment equipment is located in confined, hard-to-reach locations such as underground pump rooms, tank bottoms and shafts. Traditional solid bearing replacement requires disassembly of shafts, couplings, gearboxes and numerous surrounding components – which are often wrapped in sewage and sludge, making disassembly extremely difficult. The entire replacement cycle takes days or even weeks, while wastewater treatment plant downtime causes environmental compliance risks, penalty fines and surrounding environmental impacts amounting to tens of millions of yuan. Split bearings used in the water treatment industry are the ideal solution for reducing maintenance and repair downtime.

 

Typical pain points of traditional solid bearings in the water treatment industry:

 

Inaccessible equipment locations – Lift pumps are located at the bottom of pump rooms or underground; clarifiers are on central drive bridges above sedimentation tanks; aerators are several meters above aeration tank surfaces. In these locations, lifting equipment cannot access, and maintenance personnel working space is extremely limited. The advantage of COOPER split bearing solutions is especially valuable in hard-to-reach or trapped places.

 

Sewage and corrosive environments – Water treatment equipment is long-term exposed to sewage, sludge, corrosive gases (hydrogen sulfide, chlorine) and humid conditions. Ordinary bearing steel corrodes rapidly, seals age and fail, and bearing service life is significantly shortened.

 

Enormous disassembly workload – Replacing one bearing requires disassembling couplings, motors, gearboxes, frames and numerous other surrounding components. Pump bearing replacement often also requires disconnecting inlet/outlet piping and draining pump chamber water – an enormous project.

 

Downtime causes compliance risks – Unplanned downtime at wastewater treatment plants may cause sewage overflow and excessive emissions, facing huge environmental penalties and criminal prosecution risks. Water supply plant downtime directly affects urban residential water supply.

 

Short service life of traditional bearings – Water treatment equipment is in constant direct contact with sewage and sludge. Corrosive media penetration, high humidity and frequent start-stop impact mean conventional solid bearings typically last only 6-12 months, with extremely high replacement frequency.

 

Lifting equipment cannot access – Water plant pump rooms and tank tops have confined spaces where large cranes cannot enter. Bearing and surrounding component handling and installation rely solely on manual hoists and labor, resulting in extremely low maintenance efficiency.

 

2. NMT Split Bearings for the Water Treatment Industry: Underwater, No Shaft Removal, Quick Bearing Replacement

NMT split bearings for the water treatment industry perfectly combine the core advantage of split bearings – “no-shaft-removal installation“ – with the special requirements of water treatment equipment. The inner ring, outer ring, rolling elements and cage are all split along the axial direction – installation requires no removal of shafts, couplings, gearboxes or any other core components – assembly is completed directly on the shaft in situ.

 

More critically – NMT split bearings can be replaced without removing motors, couplings, inlet/outlet piping, without moving shaft systems, without using large lifting equipment. Because all components are completely split to the shaft, split bearings make installation and maintenance both convenient and fast. This is critical for facilities such as water treatment plants that require equipment to operate in water. This is like installing a “service door“ on water treatment equipment, enabling true “online“ maintenance.

 

▸ Full Split + Corrosion-Resistant Construction: Every Piece Can “Go in Separately, Rotate Together“ – Withstanding Sewage Corrosion

 

Every component of an NMT split bearing for the water treatment industry is split – split inner ring, split outer ring, split cage with rolling elements, split seals. During installation, these half-ring components are assembled sequentially around the shaft. After being locked with high-strength stainless steel bolts, they form a precision transmission unit with performance fully equivalent to a solid bearing. Precision step-type mating or V-shaped split joint design at the split interfaces ensures load capacity and rotational precision equal to solid bearings.

 

In terms of materials, NMT offers a complete corrosion-resistant steel system for water treatment high-humidity, corrosive environments – bearing steel with special anti-corrosion surface treatment resists sewage and corrosive gas attack; all-stainless steel (304/316L) is suitable for highly corrosive environments, with a self-repairing passive film. Split bearings address various operational pain points in water treatment corrosive conditions through corrosion-resistant material optimization, seal structure upgrades and process performance enhancement. With unique advantages of split structure, strong corrosion resistance, low-friction transmission and maintenance without disassembly, they have successfully adapted and upgraded for water treatment applications, becoming the core breakthrough for component innovation and industry cost reduction in the water treatment sector.

 

▸ No-Shaft-Removal Installation: No Motor Removal, No Piping Removal, No Large Lifting Equipment

 

The core value of NMT split bearings for the water treatment industry is – bearing replacement without moving the shaft, without removing motors and couplings, without removing inlet/outlet piping, without using large lifting equipment. Split bearing installation requires no movement of surrounding equipment or machinery. This means for lift pump bearing replacement, the motor stays in place, couplings stay in place, inlet/outlet piping stays in place, the pump body stays in place. For clarifier bearing replacement, no scraper bridge or drive disassembly is required. Maintenance personnel simply open the bearing housing, remove the old bearing halves, install the new bearing halves, and tighten the bolts – complete. Split spherical bearings can often directly replace a standard spherical bearing in an existing housing. Installation costs are low, replacement is convenient, downtime is reduced, maintenance efficiency is improved, and shaft processing requirements are low.

 

▸ Interchangeable with Standard Heavy-Duty Solid Bearings: Seamless Replacement, No Modifications

 

NMT split bearings for the water treatment industry are designed with full interchangeability with standard heavy-duty solid bearings in mind. In most cases, the outer diameter and outer ring width of split bearings are identical to standard spherical roller bearings (222, 230, 231, 239, 240, 241 series). Split spherical bearings can often directly replace a standard spherical bearing in an existing plummer block housing. This means water plants can directly replace existing solid bearings in their equipment with NMT split bearings without any machining modifications to bearing housings.

 

▸ Split Housed Bearing Units Option – NMT also offers split housed bearing units that integrate split bearings and housings as a complete assembly. Split housed bearing units can significantly reduce downtime caused by replacing standard roller bearings in mobile equipment, adding value to water plant operations. The reliability of split housed spherical roller bearing units, combined with customizable design and component interchangeability, ensures excellent heavy-load performance, protects equipment and extends uptime. Housings are available in cast iron, cast steel or stainless steel to suit different water treatment conditions.

 

3. Full Series Split Bearing Types for the Water Treatment Industry

NMT offers a complete split bearing product system covering multiple water treatment equipment applications:

 

▸ Water Treatment Split Spherical Roller Bearings

 

Split spherical roller bearings are the most widely used split bearing type in the water treatment industry. NMT split spherical roller bearings are specifically designed for lift pumps, aerators, clarifiers, sludge dewatering and other heavy-load applications – inner rings, outer rings and cages with rollers are all split in half. Spherical outer ring raceways and barrel-shaped rollers provide self-aligning capability, effectively compensating for shaft deflection and installation errors. Excellent sealing characteristics ensure reliable operation in water treatment high-humidity, high-corrosion environments. Split spherical roller bearings can be designed to operate fully submerged in sludge, providing reliable heavy-duty support in the harshest conditions. Widely used in municipal wastewater treatment plants, industrial effluent treatment stations and water supply plants.

 

▸ Water Treatment Split Cylindrical Roller Bearings

 

Split cylindrical roller bearings use cylindrical rollers to carry high radial loads, with extremely strong radial load capacity, low friction coefficient and low operating temperature rise. Inner and outer rings each split in half, with one or two rows of cylindrical rollers in a split cage. Suitable for various water treatment conveyors, screeners, sludge conveyors and other equipment. Because all components of split cylindrical housed bearing units are completely split to the shaft, installation and maintenance are both convenient and fast. This is critical for facilities such as water treatment plants that require equipment to operate in water.

 

▸ Water Treatment Split Tapered Roller Bearings

 

NMT split tapered roller bearings feature two rows of opposed tapered rollers, capable of simultaneously bearing radial and bidirectional axial loads, specifically designed for combined loads. Suitable for lift pumps, submersible pumps and other bearing positions requiring combined loads. Available in a complete range of specifications, widely used in municipal wastewater, industrial effluent and other water treatment facilities.

 

▸ Split Housed Bearing Units

 

NMT offers split housed bearing units that integrate split bearings and housings as a complete assembly. Housings feature split design with upper and lower halves, including high-strength fastening bolts, seal caps, adjustment shims and other components. Can significantly reduce downtime caused by replacing standard roller bearings in water plant equipment. Widely used in water treatment conveyors, drive belts, belt conveyors, scraper conveyors, screeners and other equipment.

 

4. Specialized Sealing and Anti-Corrosion Systems – Adapting to High Humidity, Corrosive Gases and Sewage Immersion

Water treatment equipment operates year-round under harsh conditions of high humidity, corrosive gases and sewage immersion. NMT split bearings for the water treatment industry feature customized sealing and anti-corrosion systems:

 

▸ Heavy-Duty Labyrinth Seal Structure – Non-contact design using centrifugal force from rotation to expel sewage, sludge and contaminants. Through effective bearing seal design, lubricant stays sealed inside the bearing, and caustic cleaning agents and water are prevented from entering the bearing. Sealed split bearings are suitable for water treatment plant operations as they are designed to operate fully submerged in sludge.

 

▸ Contact Seal Upgrade (Chemical-Resistant Seals) – For sewage and corrosive gas environments, NMT offers chemical-resistant sealing solutions using specialty rubber materials that resist sewage, hydrogen sulfide and chlorine corrosion. NMT split bearings address various operational pain points in water treatment corrosive conditions through seal structure upgrades.

 

▸ Split Seals – Seals are also split for installation without shaft threading, assembled simultaneously with the bearing. Seal structures use labyrinth seals combined with skeleton oil seals, offering excellent moisture-proof, water-proof and chemical penetration resistance.

 

▸ Anti-Corrosion Surface Treatment – External components such as bearing housings and clamp rings are treated with special anti-corrosion coatings, resisting water treatment high-humidity, corrosive gas and sewage splash environments. Shaft processing requirements are low.

 

5. Installation and Maintenance – An Efficiency Revolution from “Days“ to “Hours“

Installation Time Comparison:

 

Traditional water treatment solid bearing: Shutdown → drain pump chamber/tank water → disconnect inlet/outlet piping → disassemble motors, couplings, gearboxes, frames → move shaft → slide bearing on → realign → reassemble → recommission → refill water. Typical time: 1-3 days.

 

NMT split bearing: Shutdown → open bearing housing → remove old halves → install new halves → tighten bolts → complete. Typical time: just 2-5 hours.

 

NMT split bearings for the water treatment industry can reduce bearing replacement downtime by over 80%. Split bearings can significantly shorten the downtime caused by replacing standard roller bearings in mobile equipment, adding value to plant operations. Taking lift pump bearing replacement as an example: traditional solid bearing requires 1-3 days of downtime, with enormous environmental compliance risks; with the split bearing solution, replacement is completed in just 2-5 hours.

 

Maintenance Convenience:

 

No large lifting equipment required – Bearings are handled in sections – no large cranes needed. Installation requires no movement of surrounding equipment or machinery.

 

No inlet/outlet piping removal – Pump body and piping stay in place – avoiding secondary leakage risks.

 

Inspect anytime – Bearing housing can be opened for inspection without disassembly.

 

Split handling – Bearings can be disassembled into smaller components, simplifying lifting and handling – especially suitable for confined spaces such as underground pump rooms and tank tops.

 

No on-site adjustment – Clearances are preset at the factory – no on-site adjustment or specialized tools required.

 

6. Quality Control – Triple Assurance of Split Precision, Corrosion Resistance and Seal Reliability

NMT implements a strict quality control system for water treatment industry split bearings:

 

Corrosion-resistant material certification – Each batch of bearing steel undergoes salt spray corrosion testing and material composition analysis to ensure performance meets water treatment high-humidity, corrosive environment requirements.

 

Precision split surface machining – High-precision wire cutting for inner and outer ring split surfaces, ensuring concentricity and strength after assembly.

 

High-strength stainless steel locking system – Stainless steel clamp rings and multiple bolts ensure split surfaces remain secure during operation.

 

Seal performance verification – Each batch undergoes sewage environment seal testing to ensure sealing effectiveness under high-humidity, corrosive water treatment conditions.

 

Post-assembly precision inspection – Each split bearing is inspected for radial clearance, rotational accuracy and vibration after assembly – ensuring performance equivalent to solid bearings.

 

7. Stock Availability + Customization – Rapid Response to Water Plant Emergency Needs

Common water treatment split bearing models (split spherical roller bearings, split cylindrical roller bearings, split tapered roller bearings) kept in stock – Covering over 80% of split bearing needs for lift pumps, aerators, clarifiers, sludge dewatering, conveyors and other applications. Emergency failures receive rapid response – minimizing unplanned downtime.

 

Custom solutions available – Special bore/OD/width (standard range 55mm to 630mm, expandable), custom corrosion-resistant materials (stainless steel/special anti-corrosion steel), special split configurations, custom sealing solutions (chemical-resistant/fully submerged seals), custom clearance, split housed bearing units.

 

Rapid customization from samples or drawings – Provide old bearing samples or equipment drawings – NMT completes surveying and custom production quickly. Cost-effective replacement for imported brands (SKF Cooper, FAG, NSK, Timken) with significant procurement savings.

 

8. Lifecycle Cost Optimization – No Piping Removal, No Pump Removal, Save Millions in Compliance Risks

Unplanned downtime of water treatment facilities loses not only equipment repair costs but also penalty fines for excessive emissions, environmental remediation costs, government accountability and corporate reputation damage. Taking municipal wastewater treatment plant lift pump bearing replacement as an example: traditional solid bearing replacement requires 1-3 days of downtime, during which sewage overflow or excessive emissions may occur, facing huge environmental penalties; with the split bearing solution, replacement is completed in just 2-5 hours.

 

Hidden costs of cheap heavy-duty solid bearings:

 

Single replacement requires 1-3 days of downtime – environmental penalty and compliance risk losses are hundreds of times the bearing price.

 

Disconnecting inlet/outlet piping is time-consuming, and refilling water may introduce leakage risks.

 

Ordinary bearings in sewage environments last only 6-12 months – frequent replacement compounds the above losses.

 

Lifting equipment cannot access underground pump rooms – hoisting costs and time increase significantly.

 

NMT split bearings for the water treatment industry deliver “no piping removal, no pump removal, quick bearing replacement without plant stoppage“ in lift pumps, aerators, clarifiers and sludge dewatering:

 

Downtime reduced by over 80% – From days to hours – environmental compliance risks dramatically reduced.

 

No inlet/outlet piping removal – Pump body and water lines stay in place – avoiding secondary leakage risks.

 

No large lifting equipment required – Bearings are handled in sections – reducing hoisting costs.

 

Corrosion-resistant materials resist sewage and corrosive gases – Stainless steel or anti-corrosion coatings effectively resist high humidity, hydrogen sulfide, chlorine and other corrosive environments.

 

Superior sealing for fully submerged operation – Split bearings can be designed to operate fully submerged in sludge – maintaining reliable sealing even underwater.

 

Extended life of equipment (motors, gearboxes, couplings) – Fewer disassembly cycles – longer overall equipment overhaul intervals.

 

For municipal wastewater treatment plants, industrial effluent treatment stations, water supply plants, recycled water facilities and other environmental protection facility maintenance departments, the total cost of ownership with NMT split bearings for the water treatment industry is significantly lower than the repeated disassembly and replacement costs of traditional heavy-duty solid bearings – what you save is not bearing price difference, but the enormous environmental compliance risk and operational uncertainty of “replacing one bearing, shutting down an entire treatment line.“