Method For Providing A Fuel Tank Assembly

• US 20110094598A1
• Filed: 12/30/2010
• Published: 04/28/2011
• Est. Priority Date: 10/08/2007
• Status: Active Grant

• Current Assignee: The Boeing Co.
• Original Assignee: The Boeing Co.
• Inventors: Childress, James J., Davis, Warren A. II
• Granted Patent: US 8,240,502 B2
• Time in Patent Office: Days
• US Class Current: 137/15.01
• CPC Class Codes: B60K 15/03 Fuel tanks chassis frame comprising fluid storage compartment B62D21/16 ; Details of the fuel feeding system related to the fuel tank F02M37/0076
• CPC Class Codes: B60K 2015/03407 to protect tanks against projectiles
• CPC Class Codes: B64D 2037/325 Fuel tanks with provisions for reduction hydraulic ram shocks due to projectile impacts
• CPC Class Codes: B64D 37/06 Constructional adaptations thereof
• CPC Class Codes: B64D 37/32 Safety measures not otherwise provided for, e.g. preventing explosive conditions extinguishing or preventing fires in aircraft A62C
• CPC Class Codes: Y10T 137/0318 Processes
• CPC Class Codes: Y10T 137/0402 Cleaning, repairing, or assembling

Abstract

A method for providing a fuel tank assembly is provided with the fuel tank assembly configured to limit the damage otherwise occasioned by the impact of a ballistic projectile. The fuel tank assembly may include a bladder defined between exterior and interior bladder walls, with the interior bladder wall defining a volume for storing fuel. The exterior bladder wall is at least as rigid than the interior bladder wall. The fuel tank assembly can also include connectors between the exterior and interior bladder walls to at least partially limit expansion of the bladder. The fuel tank assembly can also include an inlet opening into the bladder to permit a pressurized gas to be introduced into the bladder. The fuel tank assembly may also include a valve through the interior bladder wall into the volume for storing fuel to permit at least some of the pressurized gas to be introduced therein.

Claims

1. A method comprising:

providing a bladder defined between an exterior bladder wall and an interior bladder wall interconnected by a plurality of connectors extending between the exterior and interior bladder walls in order to at least partially limit expansion of the bladder, wherein the interior bladder wall defines a volume for storing fuel, and wherein the exterior bladder wall is comprised of a different material than the interior bladder wall so as to be at least more rigid than the interior bladder wall; and

introducing a pressurized gas into the bladder such that the exterior and interior bladder walls are in contact with the pressurized gas, wherein introducing the pressurized gas comprises permitting the pressurized gas to flow past the connectors in order to be housed within the bladder on opposite sides of the connectors.

2. A method according to claim 1 wherein providing the bladder comprises providing an interior bladder wall comprised of an elastomeric or a composite material.

3. A method according to claim 1 wherein providing the bladder comprises providing an exterior bladder wall comprised of a composite or metallic material

4. A method according to claim 1 wherein providing the bladder comprises providing an interior bladder wall comprised of rubber and an exterior bladder wall comprised of a composite material configured to generate fuzz if the exterior bladder wall is punctured.

5. A method according to claim 1 wherein providing the bladder comprises providing the bladder that extends about a majority of a fuel tank.

6. A method comprising:

providing a rigid fuel tank having an expandable bladder wall disposed within and connected to the fuel tank by a plurality of connectors that extend between the fuel tank and the bladder wall in order to at least partially limit expansion of the bladder wall to thereby define a bladder bounded by the fuel tank and the bladder wall, the bladder wall formed of a different material than the fuel tank; and

introducing a pressurized gas into the bladder such that the fuel tank and the bladder wall are in contact with the pressurized gas, wherein introducing the pressurized gas causes the bladder to transition from a deflated configuration in which the bladder wall is proximate the fuel tank to an expanded configuration in which the bladder wall is spaced from the fuel tank, and wherein introducing the pressurized gas comprises permitting the pressurized gas to flow past the connectors in order to be housed within the bladder on opposite sides of the connectors.

7. A method according to claim 6 further comprising:

removing an upper portion of the fuel tank in order to dispose the expandable bladder wall therewithin; and

replacing the upper portion of the fuel tank after connecting the expandable bladder wall to other portions of the fuel tank.

8. A method according to claim 6 further comprising permitting at least some of the pressurized gas to vent through the expandable bladder wall.

9. A method according to claim 6 further comprising providing an expandable bladder wall comprised of an elastomeric or a composite material.

10. A method according to claim 6 wherein providing the expandable bladder wall comprises providing an expandable bladder wall comprised of rubber and wherein providing the fuel tank comprises providing a fuel tank comprised of a composite material configured to generate fuzz if the fuel tank is punctured.

11. A method according to claim 6 wherein the bladder extends continuously about a majority of the fuel tank.