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Патент USA US3038636

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June 12, 1962
H. s. DALEY
Y
HIGH-PRES
3,038,627
SURE CONTAINER SAFETY MEANS
Filed May 51, 1960
mm T.m
United States Patent 0
1C6
3,033,627,
Patented June f2, 1962
1
2
3,038,627
shown in the accompanying drawing, forming a part of
the speci?cation, wherein:
FIG. 1 is a bottom plan view of a container in accord
HIGH-PRESSURE CONTAINER SAFETY MEANS
Horace S. Daley, Clifton, N.J., assignor to Specialties
ance with the present invention.
Development Corporation, Belleville, N311, a corpora
tion of New Jersey
FIG. 2 is a fragmentary sectional view taken along the
line 2-2 on FIG. 1.
Filed May 31, 1960, Ser. No. 32,785
5 Claims. (Cl. 220-3)
we;
1,
FIG. 3 is an enlarged fragmentary sectional view of the
wall portion of reduced thickness.
The present invention relates to metallic containers for
Referring to the drawing in detail, there is shown a
con?ning a gas under high pressure, and, more particu 10 container which generally comprises a side wall 10, a
larly, to such containers formed with wall structure which
bottom wall 11, and a dome 12 at the upper end provided
serves as a safety valve.
with a spud 13 formed with an opening 14 for receiving
Gases such as carbon dioxide, nitrogen, oxygen and
a valve (not shown).
air are usually con?ned under pressures of between about
By way of example, the present invention can be prac
1000 and 3000 p.s.i. in a cylindrical container formed of
ticed by modifying a high-pressure container such as
a ferrous alloy which is subject to corrosion. In certain
shown in United States Patent No. 2,541,065, February
uses of such containers, for example, where compressed
13, 1951. Such a container as shown herein has a cylin
air is utilized for underwater diving or elsewhere for
drical side wall 10‘ and a hemispherical dome 12 of sub
breathing, it is essential that the air contains some humidity
stantially uniform wall thickness adapted to safely con
to avoid discomfort on the part of the person breathing 20 ?ne high pressure gas, and has a generally ellipsoidal out
the air.
wardly formed bottom wall 11 provided with radial forma
It has been demonstrated that at even relatively low
tions 15 extending axially outwardly out of the bottom
humidities of about between 40% and 50% under stand
Wall a relatively short distance beyond the center portion
ard atmospheric conditions will result in water being de
of the bottom wall which formations serve as means for
posited in the container when such air is compressed to
standing the container in upright position. The bottom
between about 1000 and 3000 p.s.i. A portion of this
wall has a thickness at least equal to the thickness of the
water remains in the container after the air has been
used and the accumulation increases with each ?lling of the
side wall and the dome.
container. Frequently, containers used with diving equip
15 may be provided which are generally pear-shaped and
have a generally spherical external knob 16 at their radi
ally outwai'd end. These knobs provide recesses 17 at
the interior which, in accordance with the present inven
For example, six circumferentially spaced formations
ment are ?lled near a body of water where higher humidi—
ties prevail, whereby the water accumulation will be
even higher and more rapid.
Such accumulations of water will cause corrosion at
the inner wall of the container, and eventually the wall
will be materially corroded and weakened at one point
tion, have a concave portion of reduced wall thickness 18
at the lowermost part thereof in which water can collect
and localize the most rapid corrosion which may occur at
to an extent whereby the pressure of the gas will burst
these portions. By reason of the general spherical shape
the container with violence. While safety regulations
require that such containers be hydrostatically tested peri
odically, failure under rapid corrosion conditions has
be reduced to a small fraction of the normal bottom wall
occurred before the time the test was required.
Accordingly, an object of the present invention is to
provide a container which will not burst with violence
when wall portions are weakened by corrosion.
Another object is to provide such a container wherein
and small diameter of the knobs, the wall thickness can
thickness without weakening the container at that point.
40
As a speci?c example of the present invention, a con
tainer was constructed in accordance with the following
speci?cations:
Material ______________________ __ Chrome moly steel
Capacity __________________________ __cu. ins__ 646
wall structure is formed which serves as a safety valve to 45 Height _______________________________ __ins__
release gas under pressure without violence.
Diameter _____________________________ __ins__
23
6.5
A further object is to provide such structure which is
simple and practical and can be formed without increase
Weight _______________________________ __lbs__
appended claims, and various advantages not referred to
simulated by exteriorily abrading the container at one of
the portions 18; and, when the wall thickness of this por
tion was reduced whereby the portion was weakened su?‘i
21
Wall thickness, side and dome ____________ __ins__ .135
in the cost of the container or adverse effect on the con
Wall thickness, bottom _________________ __ins__ .135
50 Minimum wall thickness portions 18 ______ __ins__ .090
tainer to perform its normal function.
Area of portion 18 __________________ __sq. ins__ .785
Other and further objects of the invention will be ob
vious upon an understanding of the illustrative embodi
This container was equipped with a valve and was
ment about to be described, or will be indicated in the
charged with compressed air at 2000 p.s.i. Corrosion was
herein will occur to one skilled in the art upon employ
ment of the invention in practice.
cien'tly so that it could not withstand the pressure within
In accordance with the present invention, it has been
the container, a small puncture was produced in the bot
found that the foregoing objects can be generally accom
plished by providing a container which comprises a side 60 tom wall at the portion 13 and the compressed air escaped
through the opening thus formed without further disrup
wall, and a bottom wall having means for standing the
tion of the container. This test was repeated four times
container in an upright position whereby water will collect
with the same result in each instance, thereby demon
on the bottom wall at the interior thereof and the bottom
strating that the portions 18 act as safety valves when fur
wall having recess means for collecting the water pro
vided with a portion of reduced wall thickness adapted to 65 ther thinned out as would occur by localized corrosion due
to water being constantly in contact therewith at the
be contacted by the water and adapted to be corroded to
interior.
weaken the same to cause pressure of the gas to burst the
It is also contemplated that the present invention can be
portion of reduced thickness while leaving the remainder
utilized in connection with containers which are at most
of the container intact.
times positioned so that water will collect at the bottom
A preferred embodiment of the invention has been 70 thereof.
chosen for purposes of illustration and description, and is
From the foregoing description, it will be seen that the
3,038,627
3
present invention provides an improved container which
will not be disrupted upon weakening by corrosion and
tom wall means at the interior thereof and said bottom
wall having a plurality of uniformly circumferentially
therefore eliminates the dangerous hazard to which users
spaced internal recess means for collecting the water, each
of such high-pressure containers were previously sub
jected if progressive type failure‘wereto occur.
As various changes may be made in the form, construc
tion and arrangement of the parts herein, without depart
ing from the spirit and scope of the invention and without
sacri?cing any of its advantages, it is to be understood
of said recess means being provided with a concave por
tion of reduced wall thickness normally capable of safely
withstanding the working, pressure of the gas and being
contacted and corroded by the water to weaken the same
to cause the pressure of the gas to burst at least one of
said portions of reduced wall thickness to release the
that all matter ‘herein is to be interpreted as illustrative 10 gas externally of the container before other portions of
the container walls can be corroded to materially weaken
and not in any limiting sense.
I claim:
the same to an extent whereby the pressure of the gas can
1. A container for con?ning a gas in its gaseous state
burst the container with violence, whereby’ said portion
under high pressure constructed of corrodable metal and
inherently subject to containing a su?icient quantity of
of reduced wall thickness serves as a safety valve to en
water to cause corrosion at the inner walls thereof, which
container comprises a side wall, and a bottom wall having
means ‘formed therein for standing the container in an
4. A container for con?ning a gas in its gaseous state
under high pressure constructed of corrodable metal and
inherently subject to containing a suf?cient quantity of
water to cause corrosion at the inner walls thereof, which
container comprises a side wall, and a bottom wall having
means formed therein for standing the container in an
upright position whereby water will collect on said bottom
wall at the interior thereof and said bottom wall having
means having internal recess means for collecting the
water, said recess means being provided with a portion of
reduced wall thickness normally capable of safely with
standing the working pressure of the gas and being con
tacted and corroded by the water to weaken the same to
cause the pressure of the gas to burst said portion of
reduced wall thickness to release the gas externally of
the container before other portions of the container walls
able the container to eventually fail safely.
upright position whereby Water will collect on said bot
tom wall at the interior thereof and said bottom wall
means having internal recess means for collecting the
Water, said recess means being provided with a portion of
reduced wall thickness of about two thirds of the thick
ness of the wall portions adjacent thereto, which portion
is normally capable of safely withstanding the working
pressure of the gas, said portion of reduced wall thick
can be corroded to materially weaken the same to an
extent whereby the pressure of the gas can burst the con 30 ness being contacted and corroded by the water to weaken
the same to cause the pressure of the gas to burst said por
tainer with violence, whereby said portion of reduced wall
tion of reduced wall thickness to release the gas externally
thickness serves as a safety valve to enable the container
to eventually fail safely.
of the container before other portions of the container
walls can be corroded to materially weaken the same to
2. A container for con?ning a gas in its gaseous state
under high pressure constructed of corrodable metal and 35 an extent whereby the pressure of the gas can burst the
inherently subject to containing a su?icient quantity of
container with violence, whereby said portion of reduced
water to cause corrosion at the inner walls thereof, which
wall thickness serves as a safety valve to enable the con
container comprises a side wall, and a bottom wall having
a plurality of means formed therein for standing the con
tainer in an upright position wherby water will collect on
said ‘bottom wall means at the interior thereof and said
bottom wall having internal recess means for collecting
the water, each of said recess means being provided with a
tainer to eventually fail safely.
5. A container for con?ning a gas in its gaseous state
under high pressure constructed of corrodable metal and
inherently subject to‘ containing a su?icient quantity of
water to cause corrosion at the inner walls thereof, which
container comprises a side wall, and a bottom wall adapted
to be positioned so that water will collect on said bottom
portion of reduced wall thickness normally capable of
safely withstanding the working pressure of the gas and 45 wall at the interior thereof and said bottom wall having
eing contacted and corroded by the water to weaken
the same to cause the pressure of the gas to burst at least
one of said portions of reduced wall thickness to release
the gas externally of the container before other portions
internal recess means for collecting the water provided
With a portion of reduced wall thickness normally capa
ble of safely withstanding the working pressure of the
gas and being contacted and corroded by the water to
of the container walls can be corroded to materially
weaken the same to cause the pressure of the gas to burst
Weaken the same to an extent whereby the pressure of
said portion of reduced wall thickness to release the gas
externally of the container before other portions of the
the gas can burst the container with violence, whereby
container walls can be corroded to materially weaken the
said portion of reduced wall thickness serves as a safety
same to an extent whereby the pressure of the gas can
valve to enable the container to eventually fail safely.
3. A container for con?ning a gas in its gaseous state 55 burst the container with violence, whereby said portion
of reduced wall thickness serves as a safety valve to
under high pressure constructed of corrodable metal and
inherently subject to containing a sut?cient quantity of
water to cause corrosion at the inner Walls thereof, which
container comprises a side wall, and a bottom wall having
means formed therein for standing the container in an 60
upright position whereby water will collect on said hot
enable the container to eventually fail safely.
References Cited in the ?le of this patent
FOREIGN PATENTS
610,752
Germany _____________ __ Apr. 8, 1934
het
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