CASE STUDY
MARINE BOILER ON A LNG TANKER
MALAYSIA
MARINE BOILER ON A LNG TANKER
A LNG vessel, fitted with two Babcock Marine
Boilers to generate steam to drive the
propulsion and steam turbines, experienced
heavy deposits in the Combustion and Radiant
sections of the boilers.
After Therma-Chem Treatment
Therma-Chem’s MB9 was applied on-line on a
pre-docking dosing programme for a period
of 2 months to loosen deposits and neutralise
the corrosive components prior to docking.
The pictures on the right show the condition of the economiser before and after cleaning,
highlighting the success of MB9 in removing
and preventing sulphur corrosion.
The boiler load remained steady throughout
the period while the economiser outlet
temperature declined slightly, indicating that
Therma-Chem were having a positive effect on
the boiler.
The success of this treatment was evidenced
in the clean and well-maintained surfaces
within the Combustion and Radiant sections of the boiler and the reduced cleaning time when docked. This resulted in Therma-Chem being commissioned to treat a further 15 vessels.
Before Injection

After Injection



Vacuum Tar Residue
and Fuel Gas Fired Boiler
Japan
High flue gas temperatures
and APH corrosion

HFO Fired Boiler
Saudi Arabia
Poor boiler efficiency and high
CO2 emissions

Coal Fired Boiler
Romania
Loss of boiler efficiency and
high CO2 emissions

Gas and HFO
Fired Boilers
Egypt
Efficiency loss due to fouling on
superheaters and economiser

Expander in FCC Unit
South Korea
Catalyst deposits on rotating
blades causing severe vibration

Shipping – LNG Tanker
Malaysia
Heavy deposits on combustion
and radiant sections of boilers
as well as back-end corrosion
Process Heater
Belgium
Heater temperature limited
due to fireside conditions
Process Heater
Singapore
Radiant temperature and
heater duty limited by fouling
Gas Fired Reformer
UK
Unsustainable flue gas
temperature increase
due to fouling
Refinery
Western Europe
Pre Shutdown Cleaning to
neutralized sulphur deposits