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Storage Tanks
Chemical Processing

Packaging, Inerting and Blanketing

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Nitrogen Blanketing System

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Continuous purge blanketing

A continuous flow of nitrogen (or other inert gas) is used to maintain safe oxygen concentrations within a tank headspace.

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​Pressure control blanketing

​Nitrogen is introduced into the tank headspace to maintain a set pressure. Pressurization with nitrogen minimizes air in-bleed and can reduce nitrogen usage compared to continuous purging.

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Concentration control blanketing

An oxygen monitoring system controls the flow of nitrogen into the headspace of the tank. A concentration control system can help enable precise operation and reduce gas usage compared to continuous purging.

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Nitrogen purging systems

This method is commonly used when the vessel being purged only has one opening or in batch operations like purging ethylene oxide sterilizers. Nitrogen is used to pressurize a vessel or line, it mixes with and dilutes the contents and then the diluted mixture is vented to emission control units. This process is repeated until the vessel is sufficiently purged.

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Dilution purging and drying

Nitrogen can continuously enter the vessel, dilute the mixture and exhaust through an exit preferably opposite the entrance. The geometry of the vessel and orientation of entry and exit points are important factors in the effectiveness of dilution purging. Drying follows a similar process but allows for removal of residual materials.

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Displacement purging and pigging

Nitrogen can be used to purge out a pipe run. A “pig,” a bullet shaped object, can also be pushed through the line using nitrogen gas pressure in order to purge the contents.

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Pressure transfer of liquids

A vessel’s headspace can be pressurized with nitrogen to transfer liquids without the use of a pump. This can be advantageous when pumping the material is difficult due to space constraints or when the material, such as corrosives, can cause pump issues.

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Ask the Expert

Jon Trembley
Jon Trembley

Technology Manager - Cryogenic Applications

How much nitrogen do I need to keep my flammable liquid tanks safe?

There are many factors that must be considered when designing a nitrogen blanketing system.  Understanding the material being stored and type of vessel will help to design an optimized system for your operation. Watch our short video on nitrogen blanketing. (2:45)

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