Nitrogen Production by Membrane Separation (eBook)

Published Date

January 1986

Nitrogen Production by Membrane Separation (eBook)

(Excludes any applicable taxes)

This paper describes a recently developed technique for onboard production of gaseous nitrogen. (4pp)

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Environmental control of cargo containment systems plays an important role in the operation and safety of LNG tankers. IMO's gas code gives rules for such environmental control systems or inert gas systems, as they normally are called. Shipyards building such vessels have selected equipment that fulfils the requirements. It has become common practice to use inert gas generated by combustion of light oil, where large quantities are needed and the quality of this gas is acceptable, ie for protection of void spaces.

High purity nitrogen is, however, required for bleeding of insulation, purging of cargo pipes, gas freeing of cargo pipes and cargo tanks, and also shaft sealing of gas compressors, bleeding of double pipes for fuel in the engine room. Until lately, the only available systems for onboard generation of nitrogen were based on cryogenic processes. These have been tested onboard LNG vessels, but have not been found to be suitable for the actual service and conditions. The consequence has therefore been that nitrogen demand has been covered by using liquid nitrogen produced onshore and stored in tanks on the ships. New techniques for the production onboard of gaseous nitrogen have been developed over the past 5–6 years, one of which is membrane separation of air.

Paper Delivered by:
Dr Th. Johannessen (Maritime Protection A/S)

Prepared for:
Gastech Hamburg 1986

For over 45 years, the Gastech Exhibition & Conference has been at the forefront of the international gas and LNG market. This world-renowned event is regarded as the most significant meeting place for gas and LNG professionals, where the global industry gathers to do business.

Gastech hosts major IOCs, NOC’s, global utility companies, EPC contractors, shipbuilders, pipeline companies, manufacturers, distributors, technology and service providers, all who play an active role in the global energy value chain.

Title: Nitrogen Production by Membrane Separation (eBook)
Product Code: 4433g137
Published Date: January 1986

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