Decontamination of MMH- and NTO/MON-propellant Tanks

Details Decontamination of MMH- and NTO/MON-propellant Tanks Decontamination of MMH- and NTO/MON-propellant Tanks

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.555e..55j&link_type=abstract

Proceedings of the 4th International Spacecraft Propulsion Conference (ESA SP-555). 2-9 June, 2004, Chia Laguna (Cagliari), Sard

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Scientific paper

Decontamination of liquid propellant tanks, namely MMH and NTO/MON tanks, due to emergency off- loading of a spacecraft can cause damage to the propellant tank material if safety precautions are not taken into account. MMH (Mono-Methyl Hydrazine) reacts with water with an exothermic reaction that causes temperature rise and hydrous reaction product formation. NTO and MON (Nitrogen Tetroxide Oxidiser / Mixed Oxides of Nitrogen) react with water forming nitrous and nitric acid, which may cause corrosion and enhance Stress Corrosion Cracking (SCC) in the titanium tank material. To avoid these problems, a new procedure with a numerical prediction tool for decontamination of MMH tank has been developed, used and assessed to decontaminate the MMH tank of the ESA Rosetta spacecraft successfully. The ESA proposed procedure for MON oxidiser tank emergency off-loading and decontamination is also presented.

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