Hydraulics at the edge: How biodegradable fluids are expanding into high-load and harsh-environment applications

For years, environmentally acceptable lubricants (EALs) were seen as niche solutions, limited to lighter-duty applications. But thanks to advances in synthetic renewable base stocks and progressive additive technologies, these fluids are rapidly gaining ground in the most demanding operational conditions, especially in mining.

As industries seek to meet stricter environmental standards, many are discovering that the evolution of EALs can present a solution that balances both performance and sustainability. The shift from niche to mainstream adoption is a necessity driven by both regulatory pressures and the need for enhanced operational efficiency.

Why we need synthetic renewable oils now

The performance challenges of early EALs, particularly those based on vegetable oils, are well-documented. Their vulnerability to oxidation and hydrolysis, along with a limited-service life created significant reluctance among operators, particularly in industries with high-performance demands like mining. However, the new generation of biodegradable fluids, formulated with synthetic renewable base stocks, has closed the performance gap, providing excellent wear protection, thermal stability, hydrolytic stability, and fluid longevity.

These new formulations are not only more durable but are also engineered to address the challenges of high-load environments. With equipment exposed to shock loads, high temperatures, and harsh contaminants, traditional fluids have often failed to meet these demands. This leads to frequent maintenance and unscheduled downtime. In contrast, modern EALs are designed to offer the necessary stability to perform reliably in such conditions, reducing maintenance costs and increasing equipment uptime.

Innovations in oxidation stability and performance

One of the key drivers behind the shift toward biodegradable fluids is their improved oxidation stability. Oxidation resistance is crucial for high-load and harsh environments, as it directly impacts fluid lifespan, performance, and equipment protection. Modern biodegradable fluids can now deliver service intervals comparable to those of traditional mineral oils, while maintaining biodegradability and environmental compliance. These fluids also exhibit superior low-temperature fluidity, helping them perform optimally in colder mining regions where other fluids may become too viscous to be effective. That means greater flexibility in fluid choices, extending the operating windows for mining equipment in diverse climates.

Broadening the application in mining

Historically, the adoption of biodegradable fluids in mining was limited because of concerns over compatibility with existing equipment and seals. However, as new formulations are developed with broader seal compatibility, mining operators are increasingly able to transition to EALs to lower the risk of costly leaks or system failures.

The demand for high-performance biodegradable fluids is being driven by the growing pressure to reduce environmental impact. Regulations governing fluid toxicity, biodegradability, and bioaccumulation are becoming more stringent worldwide.

Mining operations that use traditional mineral-based oils face increasing exposure in the event of spills or leaks, especially in environmentally sensitive areas. By making the switch to EALs, you not only continue to comply with regulatory standards but also reduce the risks associated with environmental damage.

Fluid selection process

When transitioning to biodegradable fluids, selecting the right fluid for specific applications is critical. Operators should consider the following factors to ensure the most effective solution:

• Seal compatibility: The chemistry of biodegradable fluids can sometimes cause seal swell or shrinkage, leading to leaks if not properly matched. Operators should audit their equipment to identify the materials used in seals and choose fluids that are compatible with those materials to prevent performance degradation.

• Oxidation stability and longevity: Different applications may require fluids with varying oxidation stability. For mining operations, where equipment is often subjected to extreme conditions, selecting fluids with superior oxidation resistance is crucial to extend service intervals and reduce maintenance downtime.

• Viscosity requirements: Depending on the operating environment, selecting fluids with the correct viscosity for temperature fluctuations is essential. Fluids that perform well in high temperatures may become too thick in cold environments, leading to performance issues.

• Environmental impact: Evaluating the biodegradability and toxicity of fluids in relation to the mining site’s environmental regulations is a key part of fluid selection. Operators should opt for fluids that offer optimal biodegradation and minimal environmental impact while still meeting performance standards.

• Performance monitoring: Ongoing fluid analysis is essential to ensure that the biodegradable fluids are performing as expected under the demanding conditions of mining operations. Regular monitoring helps detect any degradation or contamination before it impacts equipment performance.

Transitioning to biodegradable fluids key considerations:

The industry’s transition to EALs requires careful planning and consideration. In addition to seal compatibility and fluid performance monitoring, operators should be aware of the following:

• Training and knowledge transfer: The transition to EALs requires training maintenance teams on the new fluids’ properties, performance characteristics, and proper application. This ensures that operators can make the most of the advantages these fluids offer.

• Fluid analysis: Consistent fluid analysis can help ensure that the selected fluids remain effective throughout their lifecycle. This can be crucial in preventing unexpected equipment failures and ensuring that fluids maintain their performance over time.

The road ahead

With increasing demand for sustainable solutions in hydraulic fluids, industries like mining must keep up. Biodegradable fluids are no longer confined to niche applications but can be used as a practical, high-performance alternative to conventional hydraulic fluids. As technology advances and more operators make the switch, the use of EALs in mining will only increase, driving operational efficiencies while supporting sustainability goals.

For mining companies, embracing these fluids is about both compliance and staying ahead of the curve, enhancing equipment reliability, and contributing to the industry’’ overall environmental performance. By understanding the science behind these fluids and the operational advantages they offer, mining operations can position themselves for success in an increasingly eco-conscious market. 

Max Cundiff is Industrial Sector manager at Chevron.

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