What is the difference between fire tube and water tube boilers?

In a fire tube boiler the combustion gases pass through tubes surrounded by water; in a water tube boiler water passes through tubes surrounded by hot gas. Fire tube designs are cheaper and simpler up to about 20 MW and 20 bar; water tube designs handle higher pressures and faster load swings.

How often must a fire tube boiler be inspected by law?

Pressure vessels in South Africa fall under the Pressure Equipment Regulations, with periodic inspection by an Approved Inspection Authority. We prepare the boiler, attend the inspection and complete any resulting repairs.

Can you retube a package fire tube boiler on site?

Yes. We do thickness testing, remove and replace tubes with certified welders, and perform the hydraulic test and recommissioning without removing the shell.

← Fire Tube BoilersDiscovery · West Rand

Fire Tube Boilers Repair
in Discovery

Fire tube boiler repair, maintenance and annual inspection in Discovery and the wider West Rand area. Same-day response for commercial and industrial plant across Gauteng.

Capacity

200 kW – 20 MW

Fuels

Natural gas · LPG · Diesel · HFO · Dual fuel

Local Service

Fire Tube Boilers in Discovery

Our certified technicians service fire tube boilers across Discovery and the West Rand region — from hospital sterilising and laundry steam to food and beverage process steam. We carry common burner spares, safety valves and controls for major brands including Cyclotherm, John Thompson, Bosch, Cochran. Annual inspection, combustion analysis, tube cleaning and emergency breakdown response are all available in Discovery.

Brands

Our Service

What we cover in Discovery

Annual internal and external statutory inspection support
Smoke tube brushing and fireside cleaning
Furnace tube and tubesheet crack inspection
Level control, gauge glass and probe service
Safety valve setting, testing and certification
Hydraulic testing and certified tube replacement

Troubleshooting

Common fire tube boiler faults in Discovery

Tube-to-tubesheet leaks+
Likely causes
- Thermal shock from cold feedwater
- Rapid start-up cycling
- Scale or corrosion at the joint
What to check
Look for weeping or salt trails at the tubesheet during a cold inspection.
When to call us
Any confirmed leak needs certified expansion or re-welding before the next hydraulic test.
Low water alarms and level hunting+
Likely causes
- Fouled level probes or gauge glass
- Feedwater pump wear or cavitation
- Excessive TDS causing foaming and carryover
What to check
Blow down the gauge glass and probe chambers, then check boiler water TDS against the treatment specification.
When to call us
Immediately — low water is the most dangerous fault on a fire tube boiler.
Rising flue gas temperature+
Likely causes
- Soot on the fireside
- Scale on the waterside
- Damaged or missing turbulators
What to check
Trend flue gas temperature against steam output; a rise means you are losing efficiency and paying for it in fuel.
When to call us
When the rise exceeds about 20 °C over the clean baseline.

FAQ

Fire tube boiler questions — Discovery

What is the difference between fire tube and water tube boilers?
+
In a fire tube boiler the combustion gases pass through tubes surrounded by water; in a water tube boiler water passes through tubes surrounded by hot gas. Fire tube designs are cheaper and simpler up to about 20 MW and 20 bar; water tube designs handle higher pressures and faster load swings.
How often must a fire tube boiler be inspected by law?
+
Pressure vessels in South Africa fall under the Pressure Equipment Regulations, with periodic inspection by an Approved Inspection Authority. We prepare the boiler, attend the inspection and complete any resulting repairs.
Can you retube a package fire tube boiler on site?
+
Yes. We do thickness testing, remove and replace tubes with certified welders, and perform the hydraulic test and recommissioning without removing the shell.

Nearby Areas