Project record · 2025–2026
Rubber lining of slurry plant pipes and mixers — Eskom power station
Replacement and internal rubber lining of the AWRSE tank outlet pipework to slurry Mixers A, B and C, and rubber lining of the slurry plant mixers, delivered as Main Contractor with a full data book.
| Client | Eskom Holdings SOC Ltd |
|---|---|
| Sector | Power generation |
| Location | Mpumalanga |
| Role | Main Contractor (OHS Act s.16(2) / Construction Regulation 5(1)(k) appointment, 13 October 2025) |
| Reference | Signed Eskom contract, purchase order and Main Contractor appointment on file |
| Period | October 2025 – early 2026 |
Evidence held on file: Eskom Main Contractor appointment letter; signed quality control plans; approved method statements; project completion report and data book.. Contract value available to prospective clients on request.
Scope of work
- Replacement of the AWRSE tank outlet pipework feeding slurry Mixers A, B and C.
- Fabrication and supply of 250NB and 350NB carbon steel spools to SABS 719 Grade B, flanged to SABS 1123, with 45° and 90° short-radius bends, tees and Y-pieces.
- Internal lining of all spools and fittings with 6 mm chloroprene rubber.
- Rubber lining of the slurry plant mixers.
- Main Contractor responsibilities under the OHS Act: safety file, appointments, permit-to-work and confined-space controls.
Method and quality
Challenges and how they were closed
Transport damage to some spools required workshop rework and relining; an incorrect external paint colour was rectified to the Eskom coating standard; humidity extended curing on some batches. Each was closed through the non-conformance process and re-inspected before acceptance.
Outcome
All pipework lined, tested and delivered. The full data book — method statement, quality control plan, calibration certificates, material traceability, inspection reports and NCR close-outs — was submitted to Eskom Engineering and Quality, and the work was formally accepted by Eskom.
Services delivered on this project
Rubber liningRubber Lining of Pipes, Tanks & Mixers
Chloroprene and natural rubber lining for any abrasive, corrosive or chemical duty — slurry and ash-water lines, process and storage tanks, mixers, launders, chutes, valves, pump casings and flotation cells.
Service details →
PipingPiping & Valves Fabrication, Installation & Maintenance
Pipe spools fabricated to ASME B31.1 and B31.3 in carbon, alloy and stainless steel, installed and tested on site, with valve overhaul and replacement and rubber lining for corrosive and abrasive service.
Service details →
WeldingISO 3834-2 Coded Welding & Pressure Equipment Fabrication
Fusion welding of pressure vessels, pressure piping, boilers, heat exchangers, tanks and structural steel under a quality system certified to ISO 3834-2:2021, with ASME IX qualified procedures and welders.
Service details →
Project managementContracts, Project Management & Technical Advisory
Contract administration, outage planning, site supervision and close-out under Eskom and NEC-based contract forms — including Main Contractor appointments under the OHS Act — with quality control plans and data books that survive audit.
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Read the project record →Technical background to this work
The reviewed articles behind the method used on this job.
Specifying and inspecting rubber lining for slurry service: surface preparation, thickness, hardness and spark testing
Rubber lining fails at the preparation stage, not the rubber. This article sets out what to specify and what to witness — blast standard, profile, dust, primer window, thickness, hardness, adhesion and holiday testing — using a slurry-plant scope as the worked example.
Reviewed by the Operations Manager · September 2026
Read the article →What ISO 3834-2 and ASME IX qualification mean for a plant owner buying pipe welding
“Coded welding” is often claimed and rarely explained. This article explains what a plant owner is actually buying when a fabricator holds ISO 3834-2 certification and ASME IX qualified procedures and welders, and what to ask for on the next piping order.
Reviewed by the Welding Coordinator · September 2026
Read the article →Building a shutdown scope a contractor can price: QCPs, hold points, data books and what Eskom returnables require
An outage scope that cannot be priced properly is executed badly. This article sets out what a plant should put in front of a contractor, what the contractor should return, and how quality control plans, hold points and data books keep the work honest from award to close-out.
Reviewed by the Operations Manager · September 2026
Read the article →Have a similar scope?
Tell us the plant, the equipment and the window. We will come back with questions, a site-visit date or a priced quotation with a quality plan outline.
Office +27 17 007 0135 · WhatsApp +27 72 535 1598 · info@umbussoengineers.co.za
