Survitec Inert Gas generator solutions.jpg


Vessels carrying cargo producing hydrocarbon vapour require an inerting solution to eliminate the risk of explosions and fires in the cargo tanks. This can be achieved by keeping the oxygen content below 8%, a standard set by IMO. The Maritime Protection Inert Gas Generator (IGG) system is a combustion solution that creates inert gas containing oxygen less than 5%. A series of Maritime Protection Inert Gas systems designed and delivered for different applications have been the key choice for the marine market since the 1980s.



  • Flexible solutions from loose equipment to turn-key deck house modules
  • Easy installation - data communication between operator panels
  • High grade corrosion resistant steel used for the combustible chamber and cooling jacket
  • Easy access to burner & combustion chamber for inspection and service
  • Fully automatic operation with PLC Control
  • Modern operator screen with state of the art operator feedback
  • Automatic turn down ensures best possible fuel economy


  • Space saving installation
  • Easy to install and operate
  • Best possible fuel economy
  • Reliable operation performance and easy maintenance



Inert gas generator


Are you in compliance with the latest fuel sampling requirements?


Effective as of 1 April 2022, MEPC.1/Circ.864/Rev.1 updates the 2019 guidelines for on-board sampling to verify the sulphur content of fuel oil used on board ships. We have developed a convenient kit to help you comply with the new regulations. Designed for easy installation onto the fuel system of your inert gas generator, it supports sample extraction during operation, and can be easily and safely managed by your vessel crew.

Contact us for a quote or for more information on how can we can support you with compliance.







The main purpose of the inert gas production plant is to produce the required quantity of inert gas with the specified oxygen content. The overall inert gas system consists of a combustion air blower, feeding air to the generator where the production of inert gas takes place. The generator has a design capacity as specified, and is automatically operated. In case the produced inert gas capacity is larger than the demand, the system automatically reduce its production.

The main sub-systems for an IGG are:

  • Combustion air blowers
  • Combustion chamber/scrubber
  • Fuel system
  • Control system with valves & instruments
  • Deck water seal & P/V breaker

Operation and maintenance

  • Graphical LCD operator terminal, all major process parameters displayed on the screen
  • Combustion chamber and cooling jacket in high performance austenitic stainless steel (ASTM N08904)
  • Easy access to burner and combustion chamber by hinged burner front door (no tools required)
  • Easy inspection and easy replacement of scrubber components by entering man hole and removable top plate
  • Easy installation
  • Data communication between panels
  • Multiple LCD operator terminals
  • System signals and operation available for ships
  • IAS via MODBUS or ETHERNET communication
  • Tailor made systems

LCD operator terminal functionality

  • Start and Stop IG generator system
  • Monitor valve positions and motor running status
  • Adjust O2 set-point
  • Monitor process and status indication
  • Monitor alarm and adjust alarm set-points
  • Adjust controller set-points and parameters 



Product name Product type  Product details 
Maritime Protection IGG Inert Gas Generator System HFO/MGO/MDO/Gas fueled generator for inerting tankers
Maritime Protection DFIGG Dual Fuel Inert Gas Generator System IGG, dual fuel-capable to use natural gas or MGO/MDO/HFO as fuel for inerting FPSO’s/FSU’s.
Maritime Protection Flex-Inert Flex Inert System Inert gas generator system in combination with exhaust gas from main engine or auxiliary engines for fuel saving.
Maritime Protection Flue-Gen Flue-Generator System Flue-Generator System Normal generator + flexinert venturi. Can be operated in two modes:
  • Generator mode
  • Fluegas mode with suction of flue gas from boilers through flex venturi and scrubbing in generator
Maritime Protection IG-Deck House modules Inert Gas Deck House Modules Applications are tankers, FPSO’s and oil barges. All systems and capacities available.



In accordance with the SOLAS convention, all vessels over 8 DWT carrying hydroncarbon based cargo must supply inert gas to create a non-explosive atmosphere with oxygen below 8%, and establish positive pressure in cargo tanks & deck line. IGG must be operational during all discharges of cargo. To achieve inert gas notation for the vessel, the Inert Gas system must be 125% of cargo pump capacity.

Combustion inert gas systems are commonly used on:

  • Product tankers
  • Chemical/product tankers
  • Offshore vessels like FPSO/FSO's
  • S-Max and A-max tankers
  • Shuttle tankers
  • Petroleum product barges 


Combustible Inert gas systems are used for:

  • Primary inert cargo tanks
  • Prevent Oxygen from entering cargo tanks
  • during discharge
  • Purging of tanks
  • The Inert gas generator in fresh air mode
  • Used to gas free tanks prior to inspection
  • Ventilating of tanks




Survitec IGG Vessel


Table based on 3% O2 content by volume, pressure 400 mm WC and temperature 25°C. 


Inert gas capacitiy [m3/h]

Seawater consumption [m3/h]

Fuel consumption [kg/h]

Power consumption [kW]

Dimension L x W x H [mm]

Weight [kg]






1830 x 800 x 2225



500- 2200

30 -132

37.5 - 165

7.5 - 33

3000 x 1000 x 2800



2200- 3200

132 - 192

165 - 240

33 - 48

3300 x 1100 x 2800



3200- 4500

192 - 270

240 - 337

48 - 67.5

3600 x 1200 x 4000



4500- 5700

270 - 342

 337 - 427

67.5 - 85

4000 x 1400 x 4500



5700- 6800

342 - 408

427 - 510

85 - 102

4500 x 1400 x 4500



6800- 10500

408 - 630

510 - 787

102 - 157

5400 x 1800 x 4800



10500- 16000

630 - 960

787 - 1200

157 - 240

6000 x 2100 x 5025



16000- 17500

960 - 1050

1200 - 1312

240 - 262

7000 x 2100 x 5025


Gas composition with marine gas oil (MGO)

CO < 100 ppm

NOX < 100 ppm

N2 = Balance

Normal discharge pressure to cargo tank: 400 mm WC

SO2 < 1 ppm

CO2 approx. 14%

Gas outlet temperature: Max. 8°C above seawater temperature

Oxygen content adjustable down to 1%

Gas outlet humidity: 100% saturated




The Maritime Protection Inert Gas Systems are built in accordance with 1974 SOLAS Convention with latest amendments, and are fulfi lling all of Class, IMO’s guidelines and the demanding conditions of shipboard operation.




Protecting small ships with inert gas systems

Industry calls for revision to the rules


We’re supporting initiatives within the industry to install inert gas systems on oil and chemical tankers less than 8000dwt. If you are carrying a flammable cargo, then you should have an inert gas system onboard.

Learn More


Inert Gas Systems Information

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