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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.
Year: 1992
Abstract: 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.
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.
Subject: Parts Materials & Processes
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| contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
| date accessioned | 2017-09-04T17:55:06Z | |
| date available | 2017-09-04T17:55:06Z | |
| date copyright | 33918 | |
| date issued | 1992 | |
| identifier other | FIZCQCAAAAAAAAAA.pdf | |
| identifier uri | http://yse.yabesh.ir/std/handle/yse/178224 | |
| description abstract | 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. | |
| language | English | |
| title | NASA-LLIS-0203 | num |
| title | 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. | en |
| type | standard | |
| page | 2 | |
| status | Active | |
| tree | NASA - National Aeronautics and Space Administration (NASA):;1992 | |
| contenttype | fulltext | |
| subject keywords | Parts Materials & Processes |