Accession Number:

AD0849701

Title:

Fuel Tank Explosion Protection

Descriptive Note:

Rept. for 1 Mar-30 Nov 1968

Corporate Author:

BUREAU OF MINES BRUCETON PA EXPLOSIVES RESEARCH CENTER

Report Date:

1969-03-01

Pagination or Media Count:

40.0

Abstract:

Small-scale and large-scale experiments were conducted to determine the flame arrester effectiveness of three types of hollow, perforated polyethylene spheres proposed for fuel tank fire and explosion protection. In small-scale experiments, the flame quenching effectiveness of the spheres decreased with an increase in initial pressure and flame run-up distance ignition void length and with a decrease in sphere size and packing density. Randomly-packed beds of sphere types A 1-inch diameter, 0.1-inch perforations and B 1-inch diameter, 0.05-inch perforations were effective in preventing flame propagation at pressures up to 5 and 0 psig, respectively, whereas sphere type C 34-inch diameter, 0.10-inch perforations failed at 0 psig with uniformly-packed beds, none of the spheres failed at 0 psig. All three types were noticeably less effective than 10 poreinch reticulated polyurethane foam. Results from most of the large-scale gun firing experiments with randomly-packed spheres revealed that the spheres were not effective in preventing flame propagation at 0 psig in a 74-gallon modified fuel tank. Other data that were obtained in pressure drop experiments at various air velocities indicated that the flow resistance is slightly greater for sphere type C than for A or B. Empirical relationships are presented for predicting the pressure drop gradients across dry and wet beds of the spheres at air velocities from 5 to 25 ftsec.

Subject Categories:

  • Aircraft
  • Safety Engineering
  • Combustion and Ignition

Distribution Statement:

APPROVED FOR PUBLIC RELEASE