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Патент USA US2404418

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July 23, 1946.’ ,
' Filed 0ct.=5,»1942
l8 '
Br 1:: nkswalker
Patented July 23,1946 7
_ 4 Brooks Walker, Pieampn'npalif.
Application'October 5,;1942, Serial No. 460,816
‘ ifciaim.
"(Granted under‘ the act of' March a, 1883, as v
‘amended April 30', 1928; 370' O. G. 757) ’
r The invention described herein may be manu-' .
factured and used by or for the Government for
governmental purposes, without the payment to '
me of any royalty thereon.
This invention relates to a ?reproof fuel stor- '
with a. single layer, of lining " I I}, two layers as
shown are preferred. Container-Fishes a conven-.
tional ?ller opening I2 covered'byiia 'cap "Ill: .A
pipe'conn‘ection it permits draining liquid from
. the tankjand pipe I8 serves to vent the space
above the liquid to atmosphere, or whatever other disposition may be made of the vented products.
. tion is not necessarily restricted to such types.
The rubber-lined space between the two walls
.The fuel tank of a self-powered combat vehicle
is provided with a liquid drain connection 20,
is probably one of its most vulnerable parts, 10 which may if desired be piped into the main liquid
whether that vehicle is a surface type or operates
drain I5 through a valve 22. Aconnection 24 is
in the air- A bullet through the fuel tank sub
provided to space 8 to permit the introduction of
jects the occupants to at. least two risks: that of
a gas under pressure. This gas should be an inert,
loss of the fuel and consequent immobilizing of
c-r incombustible gas, such as the exhaust gas from
the vehicle, and the risk of ?re arising from the 15 an internal combustion engine. The gas pres
escaping fuel.
age tank, such as might be used in ?ghting air
craft or in combat vehicles, although its applica
It is the object of this invention to provide a‘ '
storage tank for combustible fuels which reduces
the ?re hazard of a pierced tank to substantially
nothing, and which prevents loss of the fuel in 20
spite of a few bullet holes. A doubleewalled tank
is provided, with liquid connections to the con
tainer and the space between the double walls.
"sure should preferably be greater than that of a
full head of fuel-i. e., it should be great enough
to tend to prevent leakage of fuel out of container
2 into space H] in case the tank is pierced. To
insure against leakage, the gas pressure should be
approximately twice that exerted by a full fuel"
tank at the bottom of the tank. Thus a margin of
safety will be provided to take care of increases in
A liner of a rubber-like material for the space
liquid pressure caused by “bumps,” pulling out of
between the double walls serves to seal a bullet 25 dives, and the like. The lesser pressure will, of
hole almost as fast as it is made.
course, also serve to retard such leakage, but will
Another object is to provide a fuel container,
serve less well than a pressure equal to twice that
which while possessing self-sealing character
of ‘the static head of a. full tank. A blower 26 is
istics under all conditions, may be wholly or par
provided to boost the pressure of the exhaust gas‘
tially collapsed by the weight of the fuel. in ?lling 30 to a predetermined minimum. The blower
or partially ?lling the tank so as to utilize sub
should have a capacity su?icient to sustain the.
stantially the full fuel capacity of the sustaining
envelope, and thereafter, when occasion requires,
be in?ated, as for instance when a plane upon
which the tank is mounted, goes into combat.
The speci?c nature of the invention as Well as
other objects and advantages thereof will clearly
desired pressure even in the presence of a few
bullet holes. It should be noted here that pro
vision will be made so that the blower can be
35 started up by ‘the pilot as the plane goes into com
bat or when the tank is punctured, rather than
waste power by running the blower continuously.
appear from a description of a preferred embodi
Any suitable dehydrator or moisture trap 28 is
ment as shown in the accompanying drawing in
preferably provided to ensure that the gas going
40 into space I0 is dry. A connection 30 may be
Fig. 1 of the drawing shows a fuel tank in sec
provided to relieve space ID of pressure in ex
tion, madeaccording to the invention.
cess of the aforesaid predetermined minimum.
Fig. 2 is a view, also in section, of another em
The embodiment shown in Fig. 2 differs some
bodiment of the invention.
What from that shown in Fig. 1. In Fig. 2, a
Referring particularly to Fig. 1, a fuel storage 45 container I02, of preferably, a rubber-like sub
tank is shown made up of a container 2 and a
surrounding envelope '4 spaced therefrom by
braces 6. Container 2 and envelope 4 will be made
of any suitable relatively rigid or non-yielding
stance is surrounded by an envelope I04 of a sim;
ilar substance. The two walls I02 and I04 are
secured together at spaced intervals by ties I06
which preferably provide free ?uid communica
material, preferably a metal. The space 8 be 50 tion throughout the space I08. The tank thus
tween the resultant double-walled tank is lined
formed is shown as built into and con?ned by a
with a resilient, elastic substance] I!) such as rub
compartment which may, for example, ‘be the
her or leather, although it will usually be found
bulkheads I09 and sides I III of a ship.
that a rubber-like material is preferable. Al
A ?ller opening I I2 covered by a cap I I4 is pro
though part of the invention can be practiced 55 vided. The tank is emptied through a drain IIG
and is vented through a pipe I I8. Space I08 may
be drained by a connection I20 which may be
Connection I24 permits the introduction under
pressure of an inert gas from a blower I26.
piped into drain II6 through a valve I22.
dehydrator I28 is preferably provided in the line.
Operation.—So long as the combat craft is un
disturbed, fuel is withdrawn from the tank
through the drain I6 or II6. If a bullet B or BB
a total loss, for it is substantially con?ned in
space 801- I88. Note that the ?re hazard is thus
materially'reduced. Furthermore, in case it be
comes necessary for continued operation of the
craft to use the fuel which has leaked into the
space between the two walls, valve 22 or I22 may
be opened, automatically by means not shown, or
‘I claim:
combination, a double-walled supply tank
pierces the tank, as shown at 32 or I32, inert gas 10 forInsupplying
fuel to an engine, said tank having
, ' from space 8 0r I08 pours through the hole, re-'
,tarding the flow of liquid out of container 2 or ' a highly ?exible outer casing, an inner ?exible
I02.v The bullet will make a rather sharp or clean 1 I
hole through the metal walls of Fig.‘ 1 or the bulk- I
head of Fig. 2. ‘However, the rubber tends to seal
these holes, acting veryrmuch as a stopper, thus
further retarding ?uid ?ow through them. Fur
thermore, besides the stopper-like action of the‘. . ,.
self-sealing casing, said inner and outer casings
being secured together by separating elements,
saidcasin'gs forming the top, bottom and side
Walls of said fuel tank, said outer casing having
an opening connected to the exhaust of an engine,
bottom wall of said outer casing having an
' rubber, it will often be found that the hole in the ' opening connected to the fuel supply of said en
gine to utilize fuel thatmay leak into the space
. rubber (or other material) does not line up with 20 between said casings, and means for supplying the
the hole in‘the tank; To'assist this phenomenon,‘
exhaust gases t'o'th'e space between the casings,
the yieldable lining material may if desired be
put inlplace under tension. f
If a substantial quantity of ?uid should succeed '
tin leakin‘g'out 'of container 2 or 'I 02 , it‘is still not
at pressures above'the main‘ exhaust pipe pres
sures and. atmospheric pressure.
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