NASA-LLIS-0203
Lessons Learned - Corrosion of Base Materials by Reaction Products Resulted from the Expected Release of Small Quantities of a Hypergolic Propellant (Nitrogen Tetroxide, N204) Reacting with Externally Applied Tape on Nearby Component.
active, Most Current
| Organization: | NASA |
| Publication Date: | 10 November 1992 |
| Status: | active |
| Page Count: | 2 |
scope:
Description of Driving Event:
External corrosion of tubing material caused leakage in a shuttle orbiter Reaction Control System (RCS) helium Quick Disconnect (QD). Neoprene tape was applied to the tubing in the vicinity of the N2O4 source. The corrosion was due to chemical attack by the products of a chemical reaction between nitrogen tetroxide (N204), propellant oxidizer, and the neoprene tape material. The products formed were nitric acid and various chlorides. Due to the presence of the nearby QD, small quantities of N204 were routinely present in the external environment upon mating and demating of the QD. An integrated materials compatibility assessment would have identified this incompatibility issue.
Document History
NASA-LLIS-0203
November 10, 1992
Lessons Learned - Corrosion of Base Materials by Reaction Products Resulted from the Expected Release of Small Quantities of a Hypergolic Propellant (Nitrogen Tetroxide, N204) Reacting with Externally Applied Tape on Nearby Component.
Description of Driving Event:
External corrosion of tubing material caused leakage in a shuttle orbiter Reaction Control System (RCS) helium Quick Disconnect (QD). Neoprene tape was applied to the...
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