Tank Purging

The process by which nitrogen (N2) gas is introduced to the vessel and pipeline to displace or remove undesired contaminants and hydrocarbon gas content to an acceptable and safe level where combustion cannot be supported. Due to its inert property, N2 gas will not react with the products and equipment in the system.

Tank purging is a vital process before any maintenance and inspection activities to ensure safety and compliance with regulatory requirements.

Tank Blanketing/ Inerting

N2 is commonly used as a blanketing/ inerting gas in various industries where the presence of oxygen or other reactive gases can be detrimental to the system. It involves introducing N2 gas into the systems or vessels to create an inert or non-reactive environment, in order to reduce the risk of fire, explosion or other accidents.


Cryogenic liquid N2 is used in Gas-up/Cool-down (GUCD) services where it is introduced in a controlled stepwise manner to cool down the LNG cargo tanks before their next cargo loading.

A LNG fuelled vessel was purged with N2 gas and cooled down using liquid N2 before the loading of LNG as vessel fuel.


The presence of moisture in the tanks and equipment may cause product or cargo contamination, as well as corrosion which would impact the overall integrity of the system. As a solution, heated N2 gas can be introduced into the tanks or vessels to remove the moisture content.


Vaporisers are used to convert cryogenic liquid N2 into gaseous form to support the purging and inerting operation.

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