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Atmosphere contamination following repainting of a human hyperbaric chamber complex
R S Lillo1, J W Morris, J M Caldwell
1Naval Medical Research Institute, Diving Medicine Department, Bethesda, Maryland 20814-5055.
Undersea Biomedical Research
|September 1, 1990
Summary
Repainting a hyperbaric chamber led to significant aromatic hydrocarbon contamination. Purafil scrubbing effectively removed contaminants, highlighting the need for precise gas analysis in diving facilities.
Area of Science:
- Hyperbaric Medicine
- Environmental Chemistry
- Occupational Safety
Background:
- Naval Medical Research Institute's Man-Rated Chamber Complex (MRCC), installed in 1977, underwent repainting in 1988.
- Repainting involved polyamide epoxy paint and careful application procedures.
- Initial atmospheric checks showed low hydrocarbon levels before pressurization.
Purpose of the Study:
- To investigate chemical contamination in the MRCC after repainting.
- To identify the primary contaminants and their sources.
- To evaluate the effectiveness of remediation strategies.
Main Methods:
- Atmospheric sampling and gas chromatography before and after chamber pressurization.
- Analysis of paint components (primer and topcoat).
- Application of Purafil scrubbing for atmospheric remediation.
Main Results:
- Significant contamination by aromatic hydrocarbons, primarily xylenes and ethyl benzene, was detected after pressurization.
- Off-gassing rates were similar across a wide pressure range (1.6 to 31.0 atm abs).
- Purafil scrubbing effectively removed the identified contaminants.
Conclusions:
- Repainting with polyamide epoxy paint resulted in substantial off-gassing of aromatic hydrocarbons under pressure.
- Chamber use led to a gradual decline in contamination levels.
- A high-precision gas analysis program is crucial for ensuring breathing gas safety in diving facilities.