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Патент USA US2371231

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March 13, 1945.
2,371,231
T H‘ DUFF
LIQUEF'IED HYDROCARBON ‘GAS STORAGE AND DISPENSING SYSTEM‘
Filed Oct. 23, 194.1
2 Sheets-Sheet l
2%.;
[/v VEN T012
7.7% 04/55"
?rmeMe-r ~
March 13, ‘1945.
2,371,231
T H DUFF
LIQUEFIED H'YDROGARBON GAS STORAGE AND DISPENSING SYSTEM
Filed‘ 001;. 25. 1941
2 Sheets-Sheet 2
[N VEN TOE
THDUFF
BY
a é ,
2 A
7 Hr TOENEY
2
2,371,281
As the vaporized gas is drawn off through
the service line, more lique?ed gas enters the
house or other place of consumption 01’ the V8
secondary chamber through the ori?ces l8 and
porized gas.
is quickly vaporized due to the ampli?ed area
housing
2i
has
been
shown
as
a
sin‘
While the
of contact and relatively thin volume which the
- gle member, it will readily be seen that said hous
liquid takes in the secondary chamber.
ing may also be made in two sections, one section
It is pointed out that the ?oat body 3! is
being secured to the outer shell l1 and extending
buoyantly supported upon the lique?ed gas which
upwardly therefrom, and the other section being
is present in the lower portion of the valve cham
located in the inner shell l6 and aligned with the 10 ber 22, since the ?oat chamber 34 together with
?rst section; It is also to be noted that the hous
' the vaporized gas, which has travelled through
ing may be located near the end or the tank It to
the vent tube 28 into the upper end of the ?oat
facilitate fabrication of the plan.
‘body and the ?oat sleeve 32, are trapped in the
The usual cur -box or housing 21 may be in
?oat body by lique?ed gas which has entered
stalled for protecting the control devices and other
the lower end of the ?oat body through the open
15
connections extending above the tank, if desired.
ing 35. Due to this liquid seal formed around
A U-shaped vent tube 28 has one arm 29 ex
the lower end of the ?oat body, the vaporized
tending upwardly axially within the valve cham
gas which is in the inner shell i6 cannot pass
ber 22 to a point above the top of the tank l0,
through the vent tube into the valve chamber, so
while its other arm 30 extends upwardly within
long as the lower end of the ?oat body is below
the inner shell it to a point near its top, as is 20 the liquid level within the inner shell.
clearly shown in Figure 1. This vent tube pro
In the event that the supply of heat which,
vides communication between the vapor area of
transferred from the surrounding earth, is
the storage tank and ‘the valve chamber 22 for
vaporizing the gas in the secondary chamber is
a purpose which will be hereinafter explained.
for any reason, or if the rate of with
An elongate ?oat'body 3!, closed at its upper 25 lessened
drawal of the vaporized gas through the outlet
end, is freely slidable within the valve chamber.
25 is sumciently increased, the level of the
The ?oat body has an axially disposed reduced
lique?ed gas in the secondary chamber will be
sleeve 32 secured therein and spaced from the
raised. As the lique?ed gas rises in the secondary
inner wall of said body. .The sleeve terminates
chamber, more surface of the liquid is-exposed
short of the upper end of the ?oat body and an
to the heat of the earth, due to the shape of the
annular closure plate 33 is secured, by welding
chamber, and, consequently, there is an increase
or otherwise, between the upper end of this sleeve
in the rate of vaporization. Such increase in
and the inner wall of the ?oat body, whereby
the vaporization rate will ordinarily be ample to
an annular ?oat chamber 34 is formed thereby.
take care of the increased demand for vaporized
the service line leading from the. tank to the
The lower end of the sleeve 32 is also ter
minated short of the lower end of the ?oat body,
and the lower end portion of the ?oat body has
gas.
If, however, the rate of vaporization of the gas
in the secondary chamber is not su?lcient to
an inwardly directed ?ange forming a reduced
take' care of the large withdrawal of the gas
opening 35 at the lower end of the bore of said
through the outlet, then the lique?ed gas level
body.
I
_
in the said secondary chamber will rise until such
As is clearly shown in Figure 1, the ?oat sleeve
lique?ed gas ?ows through the openings 24 to
32 is freely slidable over the arm 29 of the vent
Join the lique?ed gas which has risen equally in
tube, and is spaced therefrom to form a ?ow pas
the valve chamber 22. When this occurs, the
sage therebetween. Thus, vaporized gas enter
ing the arm 30 of the vent tube may ?ow through 45 ?oat body 3| will naturally be elevated with the
increased liquid level in the valve chamber, and,
the tube into the bore of the ?oat body and
when the lower end of the body is raised above
downwardly within said body between the outer
the liquid level in the inner shell IS, the gas
surface of the tube arm 29 and the bore of the
which is trapped in the upper portion of said in
sleeve 32 to the opening 35 at the lower end of
ner shell will travel through the U-shaped vent
the ?oat body, through which it will enter the
tube 28 and downwardly through the ?oat sleeve
valve chamber 22.v
‘
32 and outwardly through the opening 35 at the
In operation, the tank is ?lled with lique?ed
lower end of the ?oat body into the valve cham
hydrocarbon gas in the usual manner through
ber, from which it will be withdrawn through the
the ?ller inlet pipe ii. The liquid level within
the tank will rise and the lique?ed gas will ?ow 66 outlet 25 into the service line to the house.
Thus it will be seen that vaporized gas from
through the ori?ces l9 into the secondary cham
ber between the inner and outer shells of the
the main storage space within the inner shell is .
tank, and will also enter through the opening
being utilized to supply the heavy demand and
or port 23 into the lower portion of the valve
is supplementing the supply from the secondary
chamber 22, and will ?nd a level in all three 60 chamber l8, thereby considerably increasing the
chambers.
Due to the fact that the lique?ed gas in the
secondary chamber i8 is in close heat exchang
supply.
'
When the period of heavy withdrawal has ‘
passed, or when the temperature condition which
caused the loss of heat application to its outer
vaporization of such gas will take place more 65 shell has passed, the vaporized gas in the valve
rapidly than in the other chambers, and as a
chamber will force the lique?ed gas level down
result, the space above the liquid in the sec
wardly in the secondary chamber and in the
ondary chamber and the valve chamber will be
valve chamber. As the level is lowered, the ?oat
?lled with the vaporized gas under increased
body 3| will follow the liquid level downwardly
pressure. The liquid in these chambers will, 70
in the valve chamber, whereupon the gas vapor
therefore, be forced back through the openings
which has been ?owing out of the inner shell
or port 23 and the ori?ces it into the main stor
through the vent tube will be again sealed off
age space in the inner shell it, since the vaporized
by the formation of a liquid seal around the
gas cannot pass from the secondary chamber and
76 lower end of the ?oat body as the body's lower
the valve chamber into the inner shell.
ing relationship with the surrounding earth,
3
end moves below the liquid level in the inner
shell.
The system will then operate in the usual man
ner ?rst described until another period of heavy
'wlth aseoondary chamber ii at oneend. A
lique?ed gas inlet pipe 52 provides communication
between the lower portion of‘ the main tank 50
and the secondary tank, and this pipe may ex
tend to any suitable elevation within the said
repetition of the, cycle just described. '
'
secondary chamber to control the liquid level
It is to be noted'that the large space within
therein so as to maintain a large amount of liquid
the ?oat body below the lower end of the sleeve
in contact with the heat exchanging walls of the
32 prevents lique?ed gas from rushing into the
secondary chamber. A vapor inlet tube 53 is
float body and upwardly through the sleeve into 10 mounted in the upper portion of the secondary
the vent tube before such lique?ed gas could ?ow
chamber and has an upwardly directed arm 54,
outwardly from‘ the valve' chamber through the
for the same purpose as the arm 29 of the vent
opening or port 23 at the lower end of the housing.
tube 28 of the ?rst form. This tube serves the
Also, the enlarged space within the ?oat body
same purpose as the aforesaid vent tube 28, in
above the upper end of the sleeve serves the same 15 ' that it provides communication between the vapor
purpose when the ?oat body is in its completely
space of the main storage tank and the second
lowered position. Presence of lique?ed gas in
ary chamber. A valve ?oat 55 having a sealing
the vent tube would inhibit the functioning of the
element 56 of Neoprene or other suitable material
device until such lique?ed gas had vaporized.
is positioned on the upper end of the arm bit for
The locationof the bend in the vent tube at the 20 controlling the admission of the vaporized gas
lower portion of the tank serves to expose any
from the tank 50 into the secondary chamber and
lique?ed gas which might accumulate in the tube.
acts in substantially the same manner as the
to the higher temperature present at that depth,
valve or ?oat body 3| of the ?rst form of the in
and thus to assure vaporization of such accué
vention.
mulated lique?ed gas.
Ordinarily, gas is formed from the lique?ed gas
25
It will be seen that I have provided, in the
in the secondary chamber 5! and is withdrawn
above system, a secondary chamber for present
through an outlet 56 at the upper end of the
ing, the lique?ed gas to the action of the heat of
chamber into the service line. When, however,
withdrawal or loss of heat energy causes the
the surrounding earth over an ampli?ed area of
contact, thereby increasing the rate of vaporiza
gtion in a simple, readily manufactured heat ex
there is a heat loss or an extremely heavy with
30' drawal of vaporized gas through the outlet, the
level of the lique?ed gas will rise in the secondary
chamber until it ?oats the valve 55. .When the
valve is lifted, the vapor in the main storage tank '
changer, that I have ,also provided a system
wherein the lique?ed hydrocarbon gas is drawn
from storage into the heat exchanger in a liquid
form, and that I have provided means for posi
tively controlling the flow therefrom, ‘so that no
lique?ed gas can get into the service lines. Thus,
50 is permitted to ?ow from the tank into the
secondary chamber through the inlet tube 53, to
supplement the gas vaporized in the secondary
chamber and thus to satisfy the demand.
It will be readily observed that‘ this form of the
invention is very much like that ?rst described,
I have provided a system which utilizes the mixed
- butane and propane of the ordinary commercial
mixtures rather than drawing o?’ the lighter pro 40 and that it has the same advantages except that
pane faster than the heavier butane is drawn o?,
‘the heat exchanging secondary chamber is not
providing a more uniform heat value fuel by with
drawing the liquid mixture and vaporizing it. I
have also provided a means of utilizing the gas
from above the lique?ed gas in the main storage 45
in case of heavy withdrawal to supplement the
regularly vaporized supply from the secondary
chamber. This system is also a safer system be
possible with the ?rst form, but‘ other of the ad
vantages of such ?rst form are present.
,
While‘ the tanks have been described as adapted
to be buried in the earth, they may obviously be
‘ placed in the house cellar or in other special build
cause none of the liquid can enter the service line
leading-to the house.
as extensive as that of the ?rst form. In this
form there is not the delicate control which is‘
ings or housings above ground. In every case,
50 the housing or building for the tank may utilize
It is tobe noted thati‘I have provided an im- '
earth, air, water, steam, or any other suitable
proved control device for the gas which is vapor
substance as the heat source for causing vaporiza
‘tion of the lique?ed gas.
ized, wherein there is formed a liquid seal for
excluding the gas vapor from the main storage
The above description of the invention is ex
tank until the use of such gas is desired. Thus, 55 planatory only, and changes in details of the con
the valve is simple and easily and cheaply manu
struction's illustrated may be made by those skilled
factured, and‘ wear which would be, present in
in the art, within the scope of the appended
valves having material forming contacting seats
claims, without departing from the spirit of the
in the usual manner is substantially eliminated.
invention‘.
' The cap at the upper end oi’ the valve housing 60
ill may be secured by screw-threads or other re
leasable means so as to permit its removal, where
i
What I claim and desire to secure by Letters
Patent is:
'
'
'
'
by the ?oat body may be inspected, repaired and
1. A lique?ed gas storage and dispensing sys
tem including, a storage tank for holding lique?ed
replaced, if desired.
gas under pressure, a secondary vaporizing cham
‘
,
Obviously, the bouyancy of the ?oat 3! may be 65 ber in heat exchanging relationship with‘the sur
changed by varying the size of the element or
rounding medium, means for admitting lique?ed
of the ?oat chamber 30 therein. Also, the weight
gas from the storage tank into said secondary
and length of the ?oat body may be altered to
chamber for vaporization therein, a valve cham
effect opening of the vent tube 28 to permit with
ber having communication with the secondary
drawal of vaporized gas from the main storage or 70 chamber for receiving vaporized gas therefrom
inner shell, if desired.
and having a service outlet, and means establish- 1
or course, many variations of the invention are
ing communication between the vapor space of
possible. I have, however, illustrated in Figures
the storage tank and said valve chamber nor
5 and 6 a modi?ed form of the invention.
mally closed by a liquid column of the stored
In Figure 5, I have provided a storage tank 50 1| lique?ed gas to prevent admission of vaporized
4
2,871,281
gas from the vapor space of said storage tank "
to said valve chamber, said last-named means
being operable to admit such‘vaporized gas under
vaporization therein, a valve chamber having
communication with the secondary chamber for
receiving vaporized gas therefrom and having a
predetermined conditions of withdrawal of va
porized gas from the secondary chamber in ex
cess of its vaporizing capacity.
service outlet, a U-shaped tube having one arm
extending upwardhr into the vapor space in the
under pressure, a secondary vaporizing chamber 7
a U-shaped tube having one arm extending up
storage tank and its other arm extending axially
2. A lique?ed gas storage and dispensing sys
upward within the valve chamber for establish
tem including, a storage tank for holding lique
ing communication between the vapor space of
?ed,gas under pressure, a secondary vaporizing
the storage tank and said valve chamber, means
chamber in heat exchangingrelationshi-p with 10 for admitting lique?ed gas from the storage tank
the surrounding medium, means for admitting
to said valve chamber, and a ?oat valve in the
lique?ed gas from the storage tank into said sec
valve chamber telescoping the upwardly extend
ondary chamber for vaporization therein, a valve
ing arm of the U-shaped tube and actuated by ,
chamber having communication with the sec
the lique?ed gas in‘ said chamber for controlling
ondary chamber for receiving vaporized gas 15 admission of the vaporized gas from the vapor
therefrom and having a service'outlet, means
space of said storage tank to said valve chamber.
establishing communication between the vapor
6. A lique?ed gas storage-and dispensing sys
space of the storage tank and said valve cham
tem including, a storage tank for holding lique
ber, means for admitting lique?ed gas from the
?ed gas under pressure, a secondary chamber sur
storage tank to said valve chamber, and a ?oat 20 rounding said tank and in heat exchanging rela
valve in the valve chamber and actuated by the
tionship with the surrounding medium, means
lique?ed gas in said valve chamber for controlling
for admitting lique?ed gas from the storage tank
the admission of vaporized gas from the vapor
into said secondary chamber for vaporization
space of said storage tank to said valve chamber.
therein, a valve chamber having communication
3. A lique?ed gas storage and dispensing sys 25 with the secondary chamber for receiving va
tem including, a storage tank for holding gas
porized gas therefrom and having a service outlet,
surrounding said tank and in heat exchanging ' wardly into the vapor space in the storage tank
relationship with the surrounding medium, means
and its other arm extending axially upward with
for admitting lique?ed gas from the storage tank 30 in the valve chamber for establishing communi
‘into said secondary chamber for vaporization
cation between the vapor space of the storage
_ therein, a valve chamber having communication
tank and said valve chamber, means for admit
with the secondary chamber for receiving va
ting lique?ed gas from the storage tank to said
porized gas therefrom and having a service out
valve chamber, a ?oat valve in said chamber
let, a U-shaped tube establishing communication 35 telescoping the upwardly extending arm of the
between the vapor space of the storage tank and
U-shaped tube and actuated b ythe lique?ed gas
said valve chamber, means for admitting lique?ed
in said chamber for controlling admission of the
gas from the storage tank to said valve chamber,
vaporized gas from the vapor space of the storage
and a- ?oat valve in the valve chamber and actutank to said valve chamber, the liqui?ed gas in '
ated by the lique?ed gas in said chamber for
the valve chamber forming a liquid‘ seal between
controlling admission of the vaporized gas from
the ?oat valve and the U-shaped tube, and a
the vapor space of said storage tank to said valve
service line having a gas pressure regulator con
chamber, said U~shaped tube having its base por
nected to the service outlet irom said valve cham
tion in the area of greatest heat whereby lique?ed
- ber.
‘
gas which may accumulate therein is vaporized 45
7. A lique?ed gas storage and dispensing sys
by said heat to assure ?ow of vaporized gas
tem including, a storage tank for holding lique
through said tube.
'
?ed gas under pressure, a vaporizing chamber in
4. A lique?ed gas storage and dispensing sys
heat exchanging relationship with the surround
tem including, a storage tank for holding lique?ed
gas under pressure, a secondary vaporizing cham
ber surrounding said tank and in heat exchanging
relationship with the vsurrounding medium, means
for admitting lique?ed gas from the storage tank
into said secondary chamber for vaporization
therein, a valve chamber having communication
with the secondary chamber ior' receiving va
porized gas therefrom and having a service outlet,
a U-shaped tube establishing communication be
tween the vapor space of the storage tank and
said valve chamber, means for admitting lique?ed
- gas from the storage tank to said valve chamber,
and a ?oat valve in the valve chamber and actu
ated by the lique?ed gas in said chamber for
controlling admission of the vaporized gas from
the’ vapor space of said storage tank to said
valve chamber, the lique?ed gas in the valve
chamber forming a liquid seal between said ?oat
ing medium, means for admitting lique?ed gas
from the storage tank into said vaporizing cham
ber for vaporization therein, a valve chamber,
having communication with the vaporizing cham
ber for receiving vaporized gas therefrom and
having a service outlet,-means for establishing
communication between the vapor space of, the
storage tank and said valve chamber, means for
admitting lique?ed gas from the storage tank
to said valve chamber, and valve means in the
valve chamber and actuated by the lique?ed gas
in said chamber for controlling the admission‘
of vaporized gas from the vapor space of said
storage tank to said valve chamber. said valve >
means being operable to admit such vaporized gas
from the storage tank to prevent lique?ed gas
from entering the service outlet from the valve
chamber.
'
8. In a lique?ed gas‘ storage and dispensing '
valve and U-shaped tube.
'
system, a storage tank for holding lique?ed gas
5. A lique?ed gas storage and dispensing sys
under pressure, a gas vaporizing chamber, a valve
tem including, a storage tank for holding liquey 70 housing having an inlet for admitting lique?ed gas
?ed gas under pressure, a secondary vaporizing
from the storage tank and an inlet for vaporized
chamber surrounding said tank and in heat ex
gas from the vaporizing chamber, an upright con
changing relationship with the surrounding me
‘ ducfor in the housing for conducting vaporized
dium, means for admitting lique?ed gas from the
gas from the storage tank into said housing, and
storage tank into said secondary chamber for
a ?oating closure telescoping said upright con
asrmar
ductor and floating on the‘liqueiied gas in said
housing,. the contact oi’ the. lique?ed gas with
the ?oating closure forming a liquid seal to nor
mally prevent .on or vaporized gas into
~
'
'5,
?ed gas in thestorage tank, a service outlet ‘from
said chamber, a conductor establishing communi
' cation between the vapor space .in the storage
tank and the secondary chamber ‘for admitting ‘\
the housing( through the conductor and admit ‘vaporized gas from said vapor space into said
tingg vaporized gas irom_the storage tank to said
chamber; and means for utilizing a portion of the
housing when the level of liqumed sea in the
housing rises to a predetermined point.
- lique?ed gas to form a seal normally closing on
'
‘?ow of vaporized gas through the conductor but
9. In a lique?ed gas storage and dispensing sys , permitting ‘?ow of such vaporized gas to pre
tem, a storage tank for holding lique?ed gas w vent lique?ed gas from entering the service out
‘ let when the level of lique?ed gas in the secondary
under pressure, a secondary chamber in heat ex
changing reiationship with the surrounding me
chamber ris‘es?to a predetermined point.
a.
dium and having communication with the lique
~
, '
'
T'H nun.
‘
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