Inspection, Removal and Replacement of a Damaged Pennguard Chimney Lining

Project overview

W-Solutions was engaged to inspect and rehabilitate a damaged chimney lining at Kusile Power Station in South Africa. The assignment covered the complete project cycle: assessing the existing lining, engineering the rehabilitation plan, removing the damaged material and installing a new Pennguard Block Lining System.

The project was carried out under exceptional time pressure. Returning the three affected generating units to operation was critical because their availability represented important generating capacity for South Africa’s electricity grid.

To meet the demanding schedule, W-Solutions mobilized a team of 80 people and maintained continuous, 24-hour operations. Despite the difficult working conditions and complex scope, the project was completed safely, on time and within budget.

The challenge

The existing chimney had suffered extensive damage and could no longer continue operation.

Before a new lining could be installed, the condition of the chimney and the remaining lining had to be thoroughly assessed. 10 cm of slurry from the absorber had build – up on the inside of the flue walls all across the chimney, adding 100s of tons of weight to the chimney.  The build-up and the damaged lining then had to be removed without compromising the underlying structure or delaying the subsequent installation activities.

The principal challenges included:

• A severely damaged existing lining

10 cm thick slurry build-up across the entire flue wall

• Restricted and unsafe access inside the chimney
• Demanding high-level working conditions
• Removal of the existing lining and slurry buildup before reconstruction could begin
• Coordination of inspection, engineering, removal and installation activities
• Continuous quality control throughout the project
• A schedule directly connected to the return of three generating units
• The need to complete the work safely under intense time pressure

Any significant delay could have postponed the return of essential generating capacity. The rehabilitation therefore required careful engineering, disciplined project management and uninterrupted execution.

Inspection and condition assessment

W-Solutions began with a detailed inspection of the existing lining. The purpose of the assessment was to determine the nature and extent of the damage and establish the work required to restore reliable corrosion protection.

The inspection findings formed the basis of the rehabilitation plan. Damaged areas were identified and documented so that removal and replacement activities could be properly organized.

This initial assessment was essential. It allowed the project team to develop an executable plan based on the actual condition inside the chimney rather than relying solely on assumptions made before access became available.

Engineering the rehabilitation plan

Following the inspection, W-Solutions engineered a complete plan for the removal and replacement of the lining.

The plan integrated:

• Removal of the damaged existing lining
• Preparation and acceptance of the substrate
• Installation of the replacement Pennguard lining
• Work-front planning for continuous execution
• Manpower and shift organization
• Material and equipment coordination

logistics of air freight supply of 20 containers worth of material 

• Quality assurance and quality control
• Safety management
• Progress monitoring against the required completion date

The sequence was designed to keep work moving around the clock while maintaining the required installation quality. Inspection, removal, preparation and installation activities were closely coordinated to reduce delays between work stages.

Removal of the damaged lining

The existing damaged lining was systematically removed to create a suitable foundation for the new system.

This was a critical phase of the project. Removal had to progress quickly enough to protect the overall schedule while remaining controlled and thorough. Residual damaged material could have affected the preparation of the substrate and the long-term performance of the replacement lining.

Following removal, the exposed areas were inspected and prepared in accordance with the requirements of the new lining system. Only accepted work areas were released for installation.

Installation of the new Pennguard lining

After removal and substrate preparation, W-Solutions installed a new Pennguard Block Lining System.

Pennguard uses closed-cell borosilicate glass blocks installed with a durable adhesive membrane to provide long-term protection against acidic condensate, chemical attack and demanding operating conditions inside industrial chimneys and flues.

Installation activities were performed under continuous supervision and quality control. Particular attention was given to substrate condition, material application, block positioning, joint quality and completion details.

The quality-control process was integrated into the work sequence. This allowed completed sections to be inspected and accepted without interrupting progress on other work fronts.

Working around the clock

Time was one of the project’s most important constraints. The availability of three generating units depended on the successful completion of the chimney rehabilitation.

W-Solutions mobilized approximately 80 people and organized the project for continuous 24-hour execution. Multiple teams and shifts worked in coordination so that inspection, removal, preparation, installation, supervision and quality-control activities could continue without unnecessary interruption.

Delivering work at this intensity required:

• Detailed shift planning
• Clear handovers between teams
• Continuous supervision
• Reliable material and equipment availability
• Rapid resolution of site issues
• Close monitoring of productivity
• Strong safety discipline
• Immediate quality-control feedback

The combination of engineering preparation and round-the-clock execution enabled the team to maintain progress in difficult circumstances without losing control of quality or cost.

Safety and quality control

The internal chimney environment, demanding access conditions and continuous working schedule required rigorous safety management.

Work activities were coordinated to protect personnel while allowing different phases of the rehabilitation to progress efficiently. Supervision remained present throughout the project, and completed work was checked before subsequent activities continued.

Quality assurance and quality control covered the complete installation process, including:

• Condition of the prepared substrate
• Correct use and application of materials
• Installation quality of the Pennguard blocks
• Jointing and termination details
• Inspection of completed areas
• Documentation and final acceptance

Maintaining these standards under severe schedule pressure was fundamental to the successful outcome.

Project result

W-Solutions completed the chimney-lining rehabilitation on schedule and within the agreed budget.

The damaged existing lining was inspected and removed, the rehabilitation was engineered and a new Pennguard Block Lining System was successfully installed. Continuous 24-hour execution by an 80-person workforce enabled the project to be delivered within the critical outage period despite the difficult site conditions.

Completion of the project supported the return to operation of three important generating units at Kusile Power Station.

Services provided by W-Solutions

• Existing lining inspection
• Condition assessment
• Rehabilitation engineering
• Work-sequence and resource planning
• Removal of the damaged lining
• Substrate inspection and preparation control
• Pennguard Block Lining System installation
• Installation supervision
• Quality assurance and quality control
• 24-hour project execution
• Project and schedule management
• Final inspection and acceptance support

Key project achievements

• Complete inspection-to-installation responsibility
• Damaged existing lining successfully removed
• New Pennguard lining installed
• Approximately 80 people mobilized
• Continuous 24/7 working schedule maintained
• Challenging work completed under critical time pressure
• Project delivered on time
• Project delivered within budget
• Return of three generating units supported

Conclusion

The Kusile project demonstrates W-Solutions’ ability to manage urgent and technically demanding chimney-lining rehabilitations from initial inspection through final installation.

By combining corrosion engineering, Pennguard expertise, large-scale workforce coordination, installation supervision and continuous quality control, W-Solutions delivered a complete solution under exceptional operational pressure.

The successful completion of the project restored dependable chimney corrosion protection and helped make critical generating capacity available to South Africa’s electricity grid.

Protecting critical assets under demanding conditions

W-Solutions provides inspection, engineering, installation and quality-control services for industrial chimneys, flues, ducts and other assets exposed to severe corrosive environments.

Whether a project involves a planned refurbishment or an urgent lining replacement, our team can develop and execute a solution focused on safety, service life and operational requirements.

Contact W-Solutions to discuss your chimney-lining or corrosion-protection project.