Is it worth converting a coal boiler to gas or biomass?

It depends on fuel pricing, emissions obligations and the remaining life of the shell. We do a comparative running-cost study before recommending conversion, since a well-maintained coal boiler can still be the lowest-cost option on some sites.

Can you retube an old coal-fired boiler?

Yes. We do thickness testing first, then a full or partial retube with certified welding and a hydraulic test to the applicable pressure equipment regulations.

Who can operate a coal-fired boiler legally?

Larger boilers require a competent, appointed operator under the Pressure Equipment Regulations. We provide operator familiarisation training as part of installation and contract handover.

← Coal BoilersJohannesburg CBD · Johannesburg

Coal Boilers Repair
in Johannesburg CBD

Coal boiler repair, maintenance and annual inspection in Johannesburg CBD and the wider Johannesburg area. Same-day response for commercial and industrial plant across Gauteng.

Capacity

500 kW – 40 MW

Fuels

Bituminous coal · Duff coal · Anthracite · Coal/biomass blends

Local Service

Coal Boilers in Johannesburg CBD

Our certified technicians service coal boilers across Johannesburg CBD and the Johannesburg region — from large laundry and textile steam to mining and metallurgical process steam. We carry common burner spares, safety valves and controls for major brands including John Thompson, Cyclotherm, ACTOM John Thompson, Babcock. Annual inspection, combustion analysis, tube cleaning and emergency breakdown response are all available in Johannesburg CBD.

Brands

Coal boiler brands serviced in Johannesburg CBD

John Thompson
Cyclotherm
ACTOM John Thompson
Babcock
Marshall Fowler

Our Service

What we cover in Johannesburg CBD

Chain grate, stoker and drive gearbox overhaul
Refractory and brickwork repair
Tube bank cleaning, testing and retubing
ID/FD fan, damper and draught control service
Ash handling and grit arrestor maintenance
Emissions and combustion optimisation

Troubleshooting

Common coal boiler faults in Johannesburg CBD

Grate clinkering and uneven fire bed+
Likely causes
- Coal quality or sizing outside specification
- Incorrect primary air distribution
- Damaged grate bars or seals
What to check
Inspect the fire bed for cold corners and clinker mass; verify coal size and ash fusion temperature against the boiler spec.
When to call us
When output drops with the same coal feed — grate work needs a planned shutdown.
Refractory cracking and heat loss+
Likely causes
- Thermal cycling from frequent start-stops
- Age and moisture ingress
- Poor previous patch repairs
What to check
Thermal-image the casing during operation; hot spots identify failing refractory before it collapses.
When to call us
Before the next shutdown window so the refractory repair and drying schedule can be planned.
Excessive particulate emissions+
Likely causes
- Overfire air imbalance
- Grit arrestor or cyclone fouling
- Overloading the boiler above rated output
What to check
Observe stack opacity across load changes and inspect cyclone hoppers for build-up.
When to call us
Ahead of any Air Quality Act compliance inspection or emissions test.

FAQ

Coal boiler questions — Johannesburg CBD

Is it worth converting a coal boiler to gas or biomass?
+
It depends on fuel pricing, emissions obligations and the remaining life of the shell. We do a comparative running-cost study before recommending conversion, since a well-maintained coal boiler can still be the lowest-cost option on some sites.
Can you retube an old coal-fired boiler?
+
Yes. We do thickness testing first, then a full or partial retube with certified welding and a hydraulic test to the applicable pressure equipment regulations.
Who can operate a coal-fired boiler legally?
+
Larger boilers require a competent, appointed operator under the Pressure Equipment Regulations. We provide operator familiarisation training as part of installation and contract handover.

Nearby Areas