An experimental program was carried out to (1) develop empirical data on the deflagration-to-detonation run-up distance for flowing mixtures of gasoline and air in 15.2-centimeters- (6.0-inches-) diameter piping simulating a vapor recovery system, and (2) evaluate the quenching capability of eight selected flame control devices subjected to repeated stable detonations. The deflagration-to-detonation run-up distance was found to be 11.2 m (36.7 ft), or a length-to-diameter ratio of 74. The relative roughness of the run-up length of piping was 0,010 to 0.015. The stable detonation downstream of the transition point has a velocity of 1800 m/s (5906 ft/s) with a stable peak pressure of 1900 kn/m2 to the 2nd power (275 psia). There appeared to be no discernable correlation between the initial flow velocity used in testing and the resulting run-up distance. Detonations were obtained only at equivalence ratios greater than 0.8; however, there was no correlation between equivalence ratio and run-up distance for equivalence ratios ranging from 0.9 to 1.4. The successful detonation-flame arresters were: (1) sprial-wound, crimped aluminum ribbon, (2) foamed nickel-chrome metal, (3) vertically packed bed of aluminum Ballast rings, and (4) water-trap or hydraulic back-pressure valve.

  • Supplemental Notes:
    • Availability: Microfiche copies only.
  • Corporate Authors:

    Jet Propulsion Laboratory

    California Institute of Technology, 4800 Oak Grove Drive
    Pasadena, CA  United States  91103

    United States Coast Guard

    2100 Second Street, SW
    Washington, DC  United States  20593
  • Authors:
    • Bjorklund, R A
    • Ryason, P R
  • Publication Date: 1980-3

Media Info

  • Pagination: 227 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00318398
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: JPL-PUB-80-18, USCG-D-29-80
  • Contract Numbers: MIPR-Z-70099-7-74328
  • Files: NTIS
  • Created Date: Oct 8 2002 12:00AM