Though limited to only a few cases, explosion as a result of oil cargo mixing with oxygen still pose threat to most marine travelers. Oil cargo is a mixture of different grades of oil capable of producing flammable gases or vapors during the loading process. Unfortunately, these gases can be produced without any cargo on board.
For safety purposes, marine community highly recommends elaborate inert gas system for oil cargo. Whether as flue gas created by the ship boiler or inert gas plant, the role of inert gas systems in controlling explosion can never be underestimated.
The inert gas in the gas system by GIA contains less than 8% of oxygen which greatly lowers combustion of hydrocarbon. The gas spreads on the hydrocarbon mixture in the oil cargo decreasing higher explosion limit while simultaneously reducing the higher explosion limit. The process stops when the concentration is 10%, as the atmosphere created is not ideal for the combustion of hydrocarbons. The concentration of the inert gas is always maintained at 5% for safety purposes.
More than 25% inert gas systems contain automatic turn down features. After producing the required volumes of the inert gas, most systems tend to automatically shut down thus cutting down the fuel consumption costs.
Full PLC Control
This is a logical system which ensures there is proper and flawless ignition sequencing. Apart from increasing the system stability, PLC logic control ensure that only high quality soot-free gas is produced.
No Oil Spills via the Scrubber Drain
The layout of the horizontal and lowered combustion chambers prevents oil leakages through the SW drain line in the event of fires or from the fuel nozzle when the cargo is stationery.
Modern Operator Screen for Feedback
Close monitoring of the inert gas system has been made possible by the LCD screens. Necessary parameters such as temperature, valve position, and pressure can now be easily analyzed from the screen.