1. Dust collector Air Compressor inspection / service.

   a. The Supply

The Supplier shall provide comprehensive compressor maintenance services to ensure the safe, reliable, and efficient operation of all designated compressor assets. These services are structured around a preventive and condition-based maintenance strategy, aligned with industry best practices and Reliability-Centered Maintenance (RCM) principles.

The maintenance program is designed to:

· Minimize unplanned failures by addressing wear and tear proactively.

· Optimize equipment performance through scheduled inspections, fluid analysis, and targeted component replacements.

· Ensure compliance with operational and safety standards, including pressure system integrity checks, lubrication management, and airflow efficiency monitoring.

· Enhance long-term asset reliability by implementing systematic defect tracking, root cause analysis, and component standardization across sites.

The Supplier is responsible for executing all scheduled inspections, corrective maintenance, reporting, and associated project management activities, as outlined in this contract.

   b. Context and Introduction

Rio Tinto’s compressor assets are critical to maintaining safe and efficient plant operations, supporting essential processes such as instrument air supply, pneumatic controls, and material handling systems. To ensure maximum uptime, energy efficiency, and regulatory compliance, a structured maintenance strategy has been established based on Reliability-Centered Maintenance (RCM) principles and Mean Time Between Failure (MTBF) analysis.

This maintenance framework is designed to:

· Extend asset life by implementing scheduled preventive and condition-based maintenance.

· Reduce operational risks by proactively identifying and addressing mechanical wear, leaks, and pressure system integrity issues.

· Optimize compressor efficiency through routine servicing, lubrication management, and airflow balancing.

· Enhance reliability through data-driven maintenance planning, leveraging historical trends, vibration analysis, and failure mode assessments.

By following a disciplined and structured approach, the Supplier will play a critical role in ensuring operational continuity, minimizing downtime, and improving overall compressor performance across all designated sites.

   c. Overview of Supply

The Supplier must perform all scheduled maintenance, inspections, corrective actions, and reporting as outlined in this contract. The scope of work is structured into defined maintenance intervals to ensure a balance between routine servicing and deep-dive overhauls, with the goal of maintaining compressor efficiency, reliability, and compliance with operational and safety standards.

The Supplier’s responsibilities include, but are not limited to:

1. Site Inspections (PM01) – Routine and detailed inspections as specified in Section 2.3. Asset Rectification and Maintenance (PM02) – Corrective actions, component replacements, and performance optimizations as detailed in Section 2.4.

2. Deliverables – Including maintenance reports, asset register updates, and defect prioritization as outlined in Section 2.5.

3. Reporting – Structured daily, quarterly, and six-monthly reporting as per Section 2.6.

4. Project Management – Planning, scheduling, and compliance tracking as per Section 2.7.

5. General Engineering Support – Technical expertise for troubleshooting, performance assessments, and improvement initiatives.

6. Training – Competency development and knowledge transfer sessions for Rio Tinto personnel, as detailed in Section 2.8.

The Supplier must ensure that all work is performed in accordance with Rio Tinto’s operational procedures, OEM recommendations, and relevant industry regulations, while maintaining a focus on continuous improvement and efficiency optimization.

   d. Site Inspections

As and when requested by Rio Tinto, the Supplier must perform Site Inspections to assess the operational condition, safety, and performance of the designated compressor assets. These inspections are categorized into routine (on-maintenance) and shutdown (off-maintenance) intervals to balance real-time monitoring with deeper mechanical servicing.

The Supplier must ensure that all inspections:

· Follow OEM guidelines, site-specific requirements, and industry best practices.

· Include visual, mechanical, and functional assessments to detect early signs of deterioration or failure.

· Are fully documented, with inspection reports submitted to Rio Tinto as per the requirements in Section 2.6.

· Identify any urgent corrective actions that require immediate attention.

The inspection program includes the following:

a) 26WK Compressor Inspection (Online & Offline)

b) 52WK Compressor Inspection (Online & Offline)

c) 104WK Compressor Inspection (Offline)

d) 208WK Compressor Inspection (Offline)

As part of all Site Inspections, the Supplier must:

a) Mobilize to Site, set up, and demobilize from Site in accordance with Rio Tinto’s procedures.

b) Complete the Inspection Pre-Recorded Template (PRT) with detailed findings.

c) Submit the completed Inspection PRT to the Rio Tinto Representative within the agreed timeframe.

Any critical failures or urgent repair needs identified during inspections must be immediately reported for prioritization.

   e. Asset Rectification and Maintenance

The Supplier must perform corrective and preventive mechanical maintenance tasks necessary to restore compressor assets to their optimal operating condition. These rectification tasks will typically arise from routine site inspections and are aimed at preventing failures, improving reliability, and extending asset lifespan.

The Supplier is responsible for executing the following maintenance activities:

a) Lubricant changes – Perform scheduled lubricant changes at 26WK Off, 52WK Off, and 208WK Off intervals, ensuring proper oil grade and condition to maintain compressor efficiency.

b) Separator element replacements – Replace separator elements at 26WK Off, 52WK Off, and 208WK Off to maintain effective moisture and oil separation, preventing contamination of downstream equipment.

c) Drive belt inspections and adjustments – Inspect, tension, and adjust drive belts at 26WK Off and 52WK Off, replacing as necessary to ensure proper alignment and prevent wear-related failures.

d) Air leak detection and correction – Conduct soapy water leak testing at 26WK On and 52WK Off, repairing any detected leaks to optimize compressor efficiency and prevent unnecessary energy losses.

e) Receiver tank drainage and inspections – Drain and inspect receiver tanks at 52WK Off, ensuring proper condensate management and integrity of pressure vessels.

f) Non-return valve and safety valve servicing – Inspect and test non-return and safety relief valves at 52WK Off, replacing sealing sets at 104WK Off and 208WK Off to ensure safe pressure regulation.

g) Bearing inspections and replacements – Inspect bearings at 52WK Off, with full bearing overhauls at 104WK Off and 208WK Off to prevent mechanical wear and ensure smooth operation.

h) Expansion silencer replacements – Replace all expansion silencers at 208WK Off to maintain noise control and pressure regulation efficiency.

i) Vibration analysis and rotor alignment – Conduct vibration analysis at 104WK Off, with detailed rotor alignment verification and internal inspections at 208WK Off to detect imbalances and potential rotor damage.

The Supplier must ensure that all maintenance activities:

a) Are performed using OEM-approved procedures and specifications.

b) Minimize downtime and disruption to operations, ensuring tasks align with Rio Tinto’s maintenance planning schedules.

c) Are documented in maintenance reports, detailing work completed, findings, and any additional corrective actions required.

   f. Project Management

The Supplier is responsible for all project management tasks related to the execution of dust asset inspection and maintenance services across all designated Rio Tinto sites. This includes, but is not limited to:

1) Planning & Scheduling:

i. Development of detailed work plans and schedules to align with Rio Tinto’s maintenance strategies.

ii. Coordination of site logistics, ensuring efficient mobilization and demobilization.

iii. Proactive risk management, identifying and mitigating potential delays or issues.

2) Progress Tracking & Reporting:

i. Regular progress updates against key milestones, work schedules, and completion targets.

ii. Risk assessments and mitigation plans for any deviations from agreed schedules.

iii. Integration of findings and actions into Quarterly and Six-Monthly Reports.

3) Cross-Site Standardization & Process Improvements:

i. Implementation of best practices and lessons learned across multiple sites.

ii. Contribution to continuous improvement initiatives, supporting standardization of processes, equipment, and materials where applicable.

4) Meeting & Stakeholder Engagement:

i. Active participation in site dust committee meetings and relevant planning discussions.

ii. Collaboration with Rio Tinto representatives, engineers, and operational teams to ensure alignment with business priorities.

5) Compliance & Data Management:

i. Ensuring full compliance with HSE (Health, Safety, and Environment) policies, competency standards, and site induction requirements.

ii. Maintaining accurate records of all project activities, ensuring traceably and data integrity.

iii. Utilization of approved digital systems (e.g., SAP, or Rio Tinto’s internal tools) for work tracking and reportingly

   g. Site-based Training / Workshops

1) The Supplier must conduct on-site training at least once per year to enhance the skills of Rio Tinto Company Personnel in relation to Dust Assets (dust containment, collection, and suppression). Additional training sessions may be facilitated upon request by the Rio Tinto Company.

2) The Rio Tinto Company Representative will provide the Supplier with a list of relevant personnel who must attend the training sessions.

3) A training schedule will be provided by the Rio Tinto Company Representative, detailing when and where the training sessions will take place.

4) Training content is subject to finalization and approval by the Rio Tinto Company Representative before training takes place.

5) Training Sessions Must Include but not limit to:

   i. Safe maintenance and operational procedures for dust control equipment.

   ii. Root cause identification process, including industry-relevant examples, case studies, and past failures across sites.

   iii. Hands-on demonstrations of inspection techniques, equipment handling, and velocity balancing procedures.

   iv. Best practices for proactive maintenance, reliability improvement, and failure prevention.

   v. Emerging trends and technology updates in dust control and asset management.

   vi. Findings from Six-Monthly Reports, including standardization initiatives and cross-site reliability trends.

   vii. Opportunities for Rio Tinto Company Personnel to accompany the Supplier on typical inspection tasks for hands-on learning and familiarization.

   viii. Interactive Q&A sessions to address specific concerns and knowledge gaps.

6) Training Deliverables:

i. Attendance records for all participants.

ii. Competency assessments and feedback to evaluate training effectiveness.

iii. Training reports summarizing key topics covered, participant engagement, and recommendations for future training improvements.

2. Dust collector inspection / service.

a. THE SUPPLY

The Supplier shall provide Dust Asset inspections and maintenance services as and when directed by Rio Tinto, including but not limited to:

b. Context and Introduction

The Rio Tinto Companies’ Dust Assets follow a proactive and preventive maintenance strategy based on Reliability Centered Maintenance (RCM) principles. The inspection packages are aligned with the Mean Time Between Failure (MTBF) methodology to mitigate downtime and enhance reliability.

c. Overview of Supply The Supplier must perform the following tasks:

a. Site Inspections (PM01) as specified in Clause 2.3

b. Asset Rectification and Maintenance (PM02) as specified in Clause 2.4

c. Deliverables (Reports, Register Updates, etc.) as specified in Clause 2.5

d. Reporting (Daily, Six-monthly, Quarterly) as specified in Clause 2.6

e. Project Management as specified in Clause 2.7

f. General Engineering Support

g. Training (if requested by Rio Tinto) specified in Clause 2.8

d. Site Inspections As and when requested by Rio Tinto, the Supplier must perform Site Inspections, which include:

• a. Mobilisation to Site, set up, and demobilisation from Site
• b. Completion of the Inspection Pre-Recorded Template (PRT)
• c. Submission of completed Inspection PRT to the Rio Tinto Representative

The revised inspection intervals are:

a. 13WK Dust Collector Inspection (Offline)

b. 26WK Dust Collector Inspection (Offline)

c. 52WK Dust Collector Inspection (Offline)

d. Bag Changes Outs

e. Asset Rectification and Maintenance The Supplier must perform:

• a. Out-of-cycle bag change outs
• b. Dust asset maintenance tasks that can be executed during the window when the Dust Collector (DC) was offline while the offline inspection was conducted
• c. Velocity Performance Checks & Balancing (at least once per year)
• d. Ducting Repairs as necessary to ensure integrity before velocity balancing
• e. Additional maintenance tasks as otherwise requested by Rio Tinto

These works will typically result from Site Inspections which have already been completed by the Supplier.

f. Project Management The Supplier is responsible for all project management tasks related to the execution of dust asset inspection and maintenance services across all designated Rio Tinto sites. This includes, but is not limited to:

a. Planning & Scheduling:

i. Development of detailed work plans and schedules to align with Rio Tinto’s maintenance strategies.

ii. Coordination of site logistics, ensuring efficient mobilization and demobilization.

iii. Proactive risk management, identifying and mitigating potential delays or issues.

b. Progress Tracking & Reporting:

i. Regular progress updates against key milestones, work schedules, and completion targets.

ii. Risk assessments and mitigation plans for any deviations from agreed schedules.

iii. Integration of findings and actions into Quarterly and Six-Monthly Reports.

c. Cross-Site Standardization & Process Improvements:

i. Implementation of best practices and lessons learned across multiple sites.

ii. Contribution to continuous improvement initiatives, supporting standardization of processes, equipment, and materials where applicable.

d. Meeting & Stakeholder Engagement:

i. Active participation in site dust committee meetings and relevant planning discussions.

ii. Collaboration with Rio Tinto representatives, engineers, and operational teams to ensure alignment with business priorities.

e. Compliance & Data Management:

i. Ensuring full compliance with HSE (Health, Safety, and Environment) policies, competency standards, and site induction requirements.

ii. Maintaining accurate records of all project activities, ensuring traceably and data integrity.

iii. Utilization of approved digital systems (e.g., SAP, or Rio Tinto’s internal tools) for work tracking and reportingly.

g. Site-based Training / Workshops

a. The Supplier must conduct on-site training at least once per year to enhance the skills of Rio Tinto Company Personnel in relation to Dust Assets (dust containment, collection, and suppression). Additional training sessions may be facilitated upon request by the Rio Tinto Company.

b. The Rio Tinto Company Representative will provide the Supplier with a list of relevant personnel who must attend the training sessions.

c. A training schedule will be provided by the Rio Tinto Company Representative, detailing when and where the training sessions will take place.

d. Training content is subject to finalization and approval by the Rio Tinto Company Representative before training takes place.

e. Training Sessions Must Include but not limit to:

i. Safe maintenance and operational procedures for dust control equipment.

ii. Root cause identification process, including industry-relevant examples, case studies, and past failures across sites.

iii. Hands-on demonstrations of inspection techniques, equipment handling, and velocity balancing procedures.

iv. Best practices for proactive maintenance, reliability improvement, and failure prevention.

v. Emerging trends and technology updates in dust control and asset management.

vi. Findings from Six-Monthly Reports, including standardization initiatives and cross-site reliability trends.

vii. Opportunities for Rio Tinto Company Personnel to accompany the Supplier on typical inspection tasks for hands-on learning and familiarization.

viii. Interactive Q&A sessions to address specific concerns and knowledge gaps.

f. Training Deliverables:

i. Attendance records for all participants.

ii. Competency assessments and feedback to evaluate training effectiveness.

iii. Training reports summarizing key topics covered, participant engagement, and recommendations for future training improvements.

Further Notification

This scope of work is a summary description of goods and/or services that may be required by Rio Tinto and may be subject to change in Rio Tinto’s absolute discretion.

Your business capability statement, as stored on your portal profile, may be downloaded and referenced when the responses to the expression of interest are reviewed. It is recommended that Suppliers review the portal business details section to ensure all information, including contact email address, annual turnover and employee numbers, is current and accurate.

As this is an Expression of Interest (EOI) only, the specifics of the package of work relating to breadth of scope, location and timing may be subject to change. If successful, the Supplier/s will be notified of any changes prior to award.