Inert Gas Generator Solutions

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.

KEY FEATURES

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

BENEFITS

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

TECHNICAL INFORMATION

SYSTEM DESCRIPTION AND CONFIGURATION

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

Options:

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 TYPES

*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.

SYSTEM APPLICATION

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

SYSTEM APPLICATION

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

SPECIFICATIONS

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

Type	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]
MPG-400	500	30	37.5	7.5	1830 x 800 x 2225	1150
MPG-700	500- 2200	30 -132	37.5 - 165	7.5 - 33	3000 x 1000 x 2800	1500
MPG-800	2200- 3200	132 - 192	165 - 240	33 - 48	3300 x 1100 x 2800	1900
MPG-900	3200- 4500	192 - 270	240 - 337	48 - 67.5	3600 x 1200 x 4000	2200
MPG-1000	4500- 5700	270 - 342	337 - 427	67.5 - 85	4000 x 1400 x 4500	2500
MPG-1100	5700- 6800	342 - 408	427 - 510	85 - 102	4500 x 1400 x 4500	3000
MPG-1300	6800- 10500	408 - 630	510 - 787	102 - 157	5400 x 1800 x 4800	5000
MPG-1600	10500- 16000	630 - 960	787 - 1200	157 - 240	6000 x 2100 x 5025	7000
MPG-1600L	16000- 17500	960 - 1050	1200 - 1312	240 - 262	7000 x 2100 x 5025	9000

Gas composition with marine gas oil (MGO)

CO < 100 ppm	NO_X < 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		Fuel: MDO/ HFO/ GASOIL/ GAS

RULES AND REGULATIONS

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.