US 9,849,998 B2
Block foam method of accomplishing ignition mitigation in aircraft fuel tanksGeneral
US 9,849,998 B2
Block foam method of accomplishing ignition mitigation in aircraft fuel tanks
Tech Center:
3700 Mechanical Engineering, Manufacturing and Medical Devices/Processes
Examiner:
Christopher Besler
Art Unit:
3726 Manufacturing Devices and Processes, Machine Tools and Hand Tools
Agent:
J. T. Hollin, Attorney-at-Law, P.C.
Inventors:
Michael D. Williams
Assignee:
Priority:
09/11/15
Filed:
09/11/15
Granted:
12/26/17
Expiration:
05/09/36
Abstract
A process method utilizing customized, specifically-shaped pieces of reticulated polyurethane foam (RPF) to fill an aircraft fuel tank or tank compartment to provide ignition mitigation and prevent explosion in the tank. The process involves inserting the shaped pieces of RPF through existing access ports into a fuel tank in order to fill the tank, excepting minimal planned void spaces. This process effects ignition mitigation by acting as an ignition blocker, mechanically interfering with the compression wave that precedes the flame front in an explosion, and changing the vaporous mixture above the fuel level (ullage) in the tank. The foam pieces are assembled and fitted together throughout the tank in a pattern that replicates the shape of the tank. After the foam insertion is complete, the fuel tank is filled with purging fluid, drained through a filter until no debris is found, and the new maximum fuel quantity is recalibrated.
Cooperative Patent Classification (CPC)
B60B60K2015/03032B60KB64D37/02B64D