Survitec Inert Gas System


Vessels carrying cargos that produce hydrocarbon vapors require an inerting solution to eliminate risk.


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.

Survitec Inert Gas Generator
Survitec Inert Gas Generator


  • 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

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 nameProduct type Product details 
Maritime Protection IGGInert Gas Generator SystemHFO/MGO/MDO/Gas fueled generator for inerting tankers
Maritime Protection DFIGGDual Fuel Inert Gas Generator SystemIGG, dual fuel-capable to use natural gas or MGO/MDO/HFO as fuel for inerting FPSO’s/FSU’s.
Maritime Protection Flex-InertFlex Inert SystemInert gas generator system in combination with exhaust gas from main engine or auxiliary engines for fuel saving.
Maritime Protection Flue-GenFlue-Generator SystemFlue-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 modulesInert Gas Deck House ModulesApplications 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


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

TypeInert gas capacitiy [m3/h]Seawater consumption [m3/h]Fuel consumption [kg/h]Power consumption [kW]Dimension L x W x H [mm]Weight [kg]
MPG-4005003037.57.51830 x 800 x 22251150
MPG-700500- 220030 -13237.5 – 1657.5 – 333000 x 1000 x 28001500
MPG-8002200- 3200132 – 192165 – 24033 – 483300 x 1100 x 28001900
MPG-9003200- 4500192 – 270240 – 33748 – 67.53600 x 1200 x 40002200
MPG-10004500- 5700270 – 342 337 – 42767.5 – 854000 x 1400 x 45002500
MPG-11005700- 6800342 – 408427 – 51085 – 1024500 x 1400 x 45003000
MPG-13006800- 10500408 – 630510 – 787102 – 1575400 x 1800 x 48005000
MPG-160010500- 16000630 – 960787 – 1200157 – 2406000 x 2100 x 50257000
MPG-1600L16000- 17500960 – 10501200 – 1312240 – 2627000 x 2100 x 50259000

Gas composition with marine gas oil (MGO)

CO < 100 ppmNOX < 100 ppmN2 = BalanceNormal discharge pressure to cargo tank: 400 mm WC
SO2 < 1 ppmCO2 approx. 14%Gas outlet temperature: Max. 8°C above seawater temperature
Oxygen content adjustable down to 1%Gas outlet humidity: 100% saturatedFuel: MDO/ HFO/ GASOIL/ GAS


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

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