SERVICES DIVISION
Delivering safe, turnkey oil and gas solutions through expert engineering, procurement, and construction management.
LESEDI’S SERVICES DIVISION
Lesedi’s Services Division brings deep technical expertise to full-scope nuclear maintenance and outage support both across South Africa and at international facilities.
With extensive experience at Koeberg Nuclear Power Station and a growing global presence, we’re trusted for oursafety-first execution, precision, and proven nuclear capabilities.
We do more than maintain systems; we integrate with plant operations, collaborate across engineering disciplines, and continuously innovate to ensure critical systems run safely, efficiently, and in full regulatory compliance.
WHAT WE DO: STRATEGIC NUCLEAR MAINTENANCE & SUPPORT
CORE MAINTENANCE & OUTAGE SERVICES: REACTOR COOLANT PUMPS & FUEL HANDLING SUPPORT
In collaboration with site engineers, our team supports the safe and efficient management of reactor coolant systems and nuclearfuel. Though often unseen, this work is vital to the plant’s continuous operation.
Lesedi provides essential support for fuel-handling operations and reactor coolant pump (RCP) systems.
Our services cover both routine and outage-based tasks, including inspection, maintenance, and assistance with the safe run loadand reload of fuel and related infrastructure.
CORE MAINTENANCE & OUTAGE SERVICES: VALVES & PUMPS
We maintain, refurbish, and recertify a wide range of valvesand pumps — including nuclear-class components. FromFischer and Fratol to C&I valves, our teams combine deeptechnical expertise with full regulatory compliance.
Our team delivers lifecycle maintenance and refurbishmentof both nuclear and conventional valves, including:
- Fratol
- Fischer
- Dallas
- Masoneilan
- Control & Instrumentation Valves
We manage disassembly, cleaning, reconditioning, testing,and recertification ensuring optimal performance and fullregulatory compliance. Additionally, our pump expertisesupports safe plant operation under high pressure andtemperature conditions.
SPECIALIST CAPABILITY:HVAC & FILTRATION SERVICES
Lesedi has supported over 106international nuclear outages,showcasing South African expertiseacross global nuclear facilities.
As a trusted partner to Koeberg NuclearPower Station (KNPS), Africa’s onlynuclear power station, Lesedi providescritical outage support, maintenanceservices, and authorised technicalexpertise to ensure safe, reliable, andefficient operations.
Key Systems We Support:
- Centrifugal Carrier 19DH DEG Chillers
- Centrifugal (York YK) DEG Chillers
- Carrier Chillers
- Daikin Chillers
- Trane Chillers
- Filtration Infrastructure
Over 2,000 filters maintained across Koeberg, including: HEPA filters (source test compliant) Iodine/Charcoal filters (radiation-controlled zones) Pre-filters, bag filters, pads, and coalescers
Critical Areas Supported:
- Reactor Pit Cooling
- Containment Ventilation
- NAB & Fuel Building
- Electrical Building & Control Room
- Fire Ducting Systems & Fire Damper Resets
- Server Rooms, Cask Storage, ISI Vaults
- ACP1, Edusec, Documentation Centre, VisitorCentre, and more.
Our HVAC team also leads innovation and system upgrades in partnership with Engineering- driving energy efficiency, compliance, and modernization across the plant.
SPECIALIST CAPABILITY: MECHANICAL TUBE CLEANING
Through our exclusive partnershipwith Conco in Sub - Sahara Africa, wedeliver mechanical tube cleaning thatoutperforms high-pressure cleaningup to 70% faster and 90% cleaner, asmarter, more efficient solution formodern plants.
Lesedi is the exclusive Sub - SaharaAfrican agent for Conco Systems, theglobal leader in mechanical tubecleaning. This service is offered as asafer, faster, and more efficientalternative to high-pressure watercleaning.
Why Mechanical Tube Cleaning?
- 70% faster than HP water cleaning
- 90% less wastewater generated
- 24 bar safe pressure vs. 3,000 bar for HP systems
- Compact footprint for shutdown efficiency
Technologies Used:
- TruFit – For light/medium fouling
- Excaliber – Rotary cleaning for tough build-up
- MiteeMouseII – High-power handheld unit
- HydroDrill – Drill tip cleaning for fully blocked tubes
- FinTech – For online Fin-Fan exchanger cleaning (no shutdown required)
Pre-Inspection & Reporting
Before any job begins, we conduct a fullpre-inspection:
Verify plant conditions and tube
accessibility- Define scope and safety parameters
- Capture before/after data
(performance, cleanliness,
efficiency)
- All operations are measured on
safety, time, budget, and final tube
performance.
INTERNATIONAL AND LOCAL SCOPE SUPPORT
Our team is fully trained and authorised to maintain Koeberg’s HVAC systems including chillers, filtration units, and ventilation for high-riskzones. This highly specialised work requires deep expertise, and we are proud to deliver it with precision and care.Lesedi’s team is authorizedto maintain critical HVAC systems at Koeberg. Our HVAC division is built on 28+ years of legacy and over 100 years of combined teamexperience managing systems.
Key Capabilities
- Nuclear outage planning and execution
- Critical maintenance and operational support
- HVAC and ventilation systems installation and maintenance
- Infrastructure upgrades across industrial and support facilities
Facilities Supported
- Koeberg Nuclear Power Station
- Training centres
- Server rooms and IT hubs
- Logistics and storage facilities
- Administrative buildings
- Koeberg Visitor and Conservation Centres
Impact
- Supporting reliable power generation for millions of South Africans
- Maintaining world-class nuclear and industrial standards
- Developing and retaining highly skilled local engineering talent
Track Record
106+ international nuclear outages supported globally.
DMDS (DIMETHYL DISULFIDE C2H6S2)
Oil Refinery Sulfiding
Lesedi supports Arkema's Carelflex® refinery sulfiding services, delivering DMDS Evolution® E2 dosing solutions across local and international refinery operations.
Key Benefits of DMDS (Dimethyl Disulfide):
- Activates hydroprocessing catalysts by converting metal oxides into active metal sulfides, improving refinery performance.
- High sulfur content (68 wt%) makes it an efficient and cost-effective catalyst sulfiding agent.
- Reduces coke formation and carbon monoxide production, extending equipment run times and improving productivity.
- Decomposes cleanly without causing premature catalyst coking.
- Safe and practical to handle, store, and inject due to its liquid form and high sulfur concentration.
Impact: DMDS is essential for producing ultra-low-sulfur fuels and maximizing refinery efficiency.
International Project Experience: Germany, Norway, Romania, Hungary, Czech Republic, and Turkey.
WHY PARTNER WITH LESEDI SERVICES DIVISION?
