THE PUMPING OF GAS MIXTURES WITH COMBINATIONS OF PUMPING SYSTEMS IN A SPACE SIMULATION CHAMBER,
Abstract
A test was conducted in a 460 cu ft. cylindrical space simulation chamber, to determine the pumping speeds of various combinations of pumping systems for common gases, admitted individually and in mixtures to the chamber, and to examine pumping speed deviations caused by the presence of the mixture. The evaluated pumping systems consisted of 350 sq ft. of 77 K cryosurfaces, two separate configurations of 20 K cryosurfaces, two LN2-baffled 32-in. diffusion pumps, and a titanium evaporation pump. Gas inputs were mixtures of nitrogen, hydrogen, and water vapor. Increases of from 50 percent to 1000 percent in H2 pumping speed were achieved by the utilization of the titanium evaporation pump, which demonstrated a decrease in H2 pumping speed in the presence of other gases attributable to poisoning of the fresh titanium surface. Increases in N2 pumping speeds were observed to result from increased H2O vapor input. All other combinations of mixtures and pumping systems examined behaved as predicted by individually admitted gas loads.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1964
- Accession Number
- AD0428915
Entities
People
- C. E. Cheeseman
- N. C. Latture
Organizations
- Arnold Engineering Development Complex