The Maritime Protection dry inert gas generator for liquefied gas carriers is a new concept based on a proven solution. It is a combination of the traditional inert gas generator based on combustion and a two stage dehumidification system including cooling and adsorption process, where the classical two bed adsorption dryer has been replaced with a compact rotating adsorption dryer. The dew point of the inert gas is lowered to the required specifications below minus 45degC with oxygen content less than 1%.
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.


  • Up to 50% reduction in weight and foot-print compared to conventional systems
  • Continuous regeneration of dryer
  • Modern design for easy installation and maintenance
  • 100% automatic control, no manual adjustments required by operator
  • Dew point below minus 45degC reached 20-40 minutes after start, decreasing to below minus 60-65degC
  • Constant & uniform dew point during operation
  • High grade steel (SST 904) used for the combustion chamber
  • Mechanically simple and reliable centrifugal blowers due to low pressure drop in system
  • MODBUS communication with IAS
  • In dry air mode: no need of IG generator. Only cooler, dryer and dry gas blower in use saving time and cost

Survitec Dry inert gas generator.jpg



The complete Dry Inert Gas Generator is made up of three sub systems.

  • Inert Gas Generator, utilising Maritime Protection’s well proven inert gas generator
  • Cooler and dryer skid with fi n type cooler, and Maritime Protection’s new concept – the rotating adsorption dryer
  • Refrigeration plant, closed loop type, with no Freon transported into the cooler unit

The Maritime Protection Dry Inert gas generator produces clean and soot free inert gas by combustion of gas oil supplied by the fuel oil pump with air provided by blowers, in the combustion chamber of the inert gas generator. The gas is efficiently cooled in the scrubber tower and the saturated gas is dried in a two stage process:

  • A cooler compromising of a fi nned tube coil reduces the humidity to +5ºC dew point. The cooling effect in the cooler is provided through a glycol/ water circuit from a separate water chiller unitler, dryer and dry gas blower in use
  • The final drying is achieved by a continuously rotating adsorption dryer, dew point below minus 45degC

Operation and maintenance

  • Fully automatic, for unattended operation
  • No manual adjustments required
  • All process parameters displayed on operator panel
  • Modes of operation can be selected on operator panel, no manual changes when changing mode
  • Easy maintenance through:
  • Hinged burner front door allowing easy access
  • Filters, dryer rotor and other major components can be easily checked through inspection hatches


  • Multiple operator terminals
  • Ethernet communication with IAS (modbus is standard)
  • Electric or steam regeneration heater

System configuration with compact cooler and rotating adsorption dryer

Rotating adsorption dryer

  • Far more efficient, more compact and require less maintenance than any previous old dual bed dryer
  • Constant regeneration (regenerating saturated desiccant in same rotational cycle)
  • 20% of weight compared to "old conventional two bed" dryer

Utilizing the more maintenance friendly centrifugal blowers

  • Virtually no maintenance
  • Less noise and vibration

Closed loop cooling system provided through a glycol/water circuit from a separate water chiller unit

  • Less possibility for leaks of Freon
  • Requires less Freon/refrigerant










Rotating adsorption dryer – compact design


Dry Inert gas systems are commonly used on:

  • LNG carriers
  • LPG carriers
  • FRSU
  • FLNG

Combustible Inert gas is used to:

  • Inerting and drying of cargo tanks, cargo piping and machinery
  • Purging of tanks
  • The dry inert gas generator in fresh air mode:
    • Used for aeration of cargo tanks before inspection
    • Drying and aeretion of hold space


Survitec Dry Inert Gas Generator Vessel


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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