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Oct. 1; 1946.
"
J. H. WIGGINS
2,408,538‘
LIQUID STORAGE APPARATUS
Filed Dec. 24, 1945
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2 Sheets-Sheet 1
INVENTOR:
JOHN H. WIGGINS.
v
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‘BY, MMW
'_ ATTORNEY ._
Oct. 1, 1946.
2,408,538
J. H. WIGGINS
LIQUID STORAGE APPARATUS
Filed Dec. 24, 1945
2 Sheets-Sheet 2,
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2,408,538
Patented Oct. 1, 1946
'_ Lratim 's'roRaoE APPARATUS I
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Other ‘objects and'desirable features of my -in-'
vention'will'be' hereinafter pointed out. f
‘Figure 1 of the drawingsfi's ‘av fragmentary
verticalt'ransverse sectional’ View of a liquid stor
age apparatus embodying my ‘present invention;
paratu's o-_i'_ the, general type that comprises a tank‘,
or containerwforfholding‘the liquid, (a vertically-jv
movable member in saidv tankwhich emanates
' also-called; “?oating roof” that rests upon“- and
is‘ sustained; ' byjthe "liquid being’ stored,‘ and‘ a
showing the floating'roofat the‘énd of its‘ upward
stroke, in the position “it occupies whenlthe eon
sealing means for they annular space around‘ ‘the
peripheral édg'e'idf, ‘ch19. fbqf} 'doll?s?iilg ofla'?lexi ‘
ible sealing element‘of 'tre'atedlfab'r‘ic or ‘other,
-
‘
v
ing roof in an‘ intermediatejposition between its
suitable material, attached to the edge of thereof 7
high and Iowl‘positionsi; aria ?
“Figure 3 is a similar viewf‘showin’g the-roofi‘n
andtothe side wallet 'th’éjcoataihéai'a‘such a
manner that‘ it‘ will heat suspended. ~
underside'oi’ithe rooftduri‘ng the rise
tainer is full of liquid.
its lowermost position.
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:- In the. drawings, A designates the side‘ waIIFof
ofthegroof. "A liquid storage"apparatu-sfoi'v the
general‘ type or kind abovementioned‘ is disclosed x15 av vcqzintainer“jortank; in which liquid X‘ is being
:and “B” designate-s a vertically-movable
PatentNo, 12959686, dated ‘Aug ~ " ‘stored?
?oa'tingroof ithat ‘rests-upon‘ and Zia-sustained :by V
the; liquid‘ X being’?v stored; The-annular: space at
One object-of- 'mjpreissst invention ‘is to bro; ,7 ‘ ‘_ the
peripheraled'ge ofv the roof is closed by a ‘?ex;v
, ib'le-sealing element 6, preferably cons-truetedof
treated fabric; attached to ltherperipheral edgeiof
the ‘roof and-do; the: intermediate portion: of-c'the
side wall. of! the container, ,and'made'ofsuch. shape
-.and size thatjitl'is'icalfablej‘ef folding ‘on'dowbiing'
-during'thezirise’andffal'lofi-the roof. I‘
'Y
will
Ini'order
assume
‘tovtheiorm
insure: that
of "the
a downward-hanging
sealing element
loop; lzprovide the roof Bat its peripheral edge
with portions‘ that constitute the bottom and" one
sidewall. of atrough, designated as an entirety
charged from Same‘into" the loopr'h'o'f ‘the?ex'ibl'e
sealingvelement or‘i‘n‘to the space between said
by the-rreference character B’, that i'sada-pted
element
during the
and
d'b'wnward’travel‘
theisidefwall of"0fthe
theroof;v
container;
gamma
bile li?ui‘d will b'ereturn'éd to saidtrough where
to‘ ‘contain a body<~=of ' mobile. liquid; .01’; which;
during: the upward jtraveli ofY’the- roof,‘ escapes
from or, spills out; of said trough Bf“- audit-exerts
it will he 'i’n‘readi‘nes's'to nerfor‘m its vfunction
during the succeeaing‘upward tl‘ayel' or the‘ rem;
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'Anot‘herj’object is to nrovid'ela storage aena a
azf‘orce on the sealingelement C that‘ causes
. ‘said sealing element to- assume the shape; or form
of a downwardly‘ hanging, loop: Said trough'H-B'v
tus’ of ' the" general kizi'd‘riiéht'iqh d,-"th'at
.
can.
be constructed .in various'iways- without de
' equipped‘ with a means Qrmeenaaism" for pr'él ‘
ible'
venting‘
sealing
excessive
element,
bulgingyor'belhring
inwardly, awayrromthe
of" the‘, side
wall of the container. as‘ a result of nressurefex
erted on said element by the ‘mobile liquid‘ con;
parting-from the spirit of my in-Ventionq In the
form‘ of my’ invention herein‘ illustrated; the roof
is provide-dwitnan upwardly-projecting rim: Ba,
set some distance» inwardly from‘ the edge-oi the
‘roof; so’ that iti'constitutes one of the vertical
?ne‘d in the loo)": of saia'elem‘entl or in ‘the space
side walls of a trough B’; whose- bottomis formed
betweenthei sealing‘ element‘ and the? ‘side wall
45 by the peripheral: portion‘ of the. roof, the scale
ofthe container?
ing element?G being made‘of such-length that
And‘still' another object ofrny'inventfonisi/to
when the roof isr'in’ its lowermost position-,1~ as‘
provide- a‘ storage‘ apparatus of the general?’ kind
mentioned, that is' equipped with anovel means ' shown in. rFigure-?iysaid sealing element iconsti
tutes’the other vertical side wall: of'th'eatrough
orrzmechanism for preventing the ?exiblesealing
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element from bulging or; belly-ing outwardly Tex’ 50 B’. *At ‘such. times themobile- l‘ "d G’ in the
cessively and rubbing ‘against the side w-allaetthe ' trough B! exertsa downward-for‘, on the-‘part
container, in instancesywhere'theyliquid stored
in- the container exertsroutwardv-pressure on said
sealing element" in ‘excess of the inward‘ pressure
which the mobile liquid, exertslon said element‘. -'
' of.v the-v sealingt element C immediately adjacent
theiperipheral edge of‘ the roof’, and causes it‘ to
assume f aiidownwardl'y-looped' formf,i7 as clearly
shown;v in: Figure 3'.v ' = As the roof moyes‘upwar'dly,
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2,408,533
4
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ered with rubber or some other suitable mate
more and more 01 the mobile liquid C' escapes
from the trough B’, into the loop of the sealing
rial, that will prevent injury ‘to the sealing ele
element C, or into the space between said ele
ment and the side wall of the container, with
the result that by the time the roof reaches its
highest position, as shown in Figure 1, all, or
ment C when said element contacts with said sup
practically all, of the mobile liquid has been dis
charged from the trough B' and applied to the
sealing element C in such a way as to (insure that
barrier or fender collapses into an inactive con
porting devices.
When the roof B approaches its lowermost po
sition, shown in Figure 3, the above described
dition, with the compression members I disposed
in stacked relationship on the bottom of the
said sealing element’ will hang“ suspended from 10 containenthe ‘supporting devices {being suffi
ciently ?exible to permit the members”! to pile
the edge of the roof. ‘During the‘ ?rst" portion
of the downward travel‘of the roof, the portion, ' , up, one on top of the other. During the upward
0f the side wall A of the container located above“ ‘travel of the roof, said barrier or fender progres
sively unfolds-and assumes an active position, or
the point of attachment of the sealing element
C with said side wall, functions asa side wall 15 operative position, wherein it is arranged in such
relationship ,with the sealing element C, that pres
for the trough B’, arranged in opposed relation 7
sure exerted by the mobile liquid C’ on the seal
to the other side wall B2 oflv said trough, Dur
ing element C in a direction tending to ?ex said
ing such movement of the roof, the mobile liquid
element inwardly, or towards the center of the
‘C’ starts to return to the trough B’ andI as the
downward movement of the roof continues, more 20 container, is taken up or absorbed by the barrier,
whereby excessive inward bulging, ballooningor
and more of the mobile'liquid returns to said
bellying of .the ?exible sealing element is e?ec:
trough, with the result that by the time the roof
reaches its lowermost position, all of the mobile
liquid 0' is in the, trough Bf in readiness toagain
tively-prevented. Moreover, this highlydesirable
result is accomplished without subjecting the seal_
perform its function on the succeeding upward
25 ing' element C to excessive friction, inasmuch
stroke of the roof. By handlingthe-mobile liq
as the sealing element C travels at the same speed
as the fender, or barrier, andat notime vhas a
rubbing action on the fender, caused by relative
uid C’ in the manner above described, I produce
an inexpensive apparatus, inasmuch as the bot
tom ‘and one side wall of the trough B’ are formed
vertical movement between said element, and
by portions of the roof and the other'side wa'l 30
In addition to, providing the floating roof B
of said reservoir is formed by a ?exibleseal‘ng
with a barrier or fender. that-rises and falls with
element C, or by the upper ‘portion of the side
the roof. and automatically, collapses into, an in
fender.
wallA of the container.
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‘ If the mobile liouidC' is of, greater-speci?c
active condition as. the ,roof- approaches its lower
gravity'th‘an the liquid X being stored in:v the
apparatus, there is a tendency for the ?exible
sealing element C to bulge, inwardly excessively,
away: from the ‘Side wall of'the container, due
most position, I prefer to ‘provide, the roof with
a means for preventing the. ?exible sealing ele
ment C from being forcedoutwardly int-o rubbing
to the weight of the sealing liquid 0', or the
inward force said liquid exerts on the sealing
element C. Such excessive inward ?exing or
container. 'intheevent the pressure inthespace
between, the sealing elementC and the side wall
of the,container becomes less than- the outward
bellying of the sealing element C produces ran
force orpressure whichvthe stored liquid vX .ex,-.
_ erts on the sealing element C. .Such areduced,
dom wrinkles or folds in ‘same, which are in~v
jurious to said element. In ‘order to overcome
contact or engagement with the side wall. A of the
diminished or minus _- pressure . might be. created
this objection, I have provided the‘?oating'roof
on'the external side of- the {sealing element Got
‘ B with a means or mechanism‘ that e?ectively
in the space between saidelement and the side
wall of’ the container fromyariousicauses- For
takes up forces or strains exerted on‘ the sealing
element C in a direction tending to cause it to
bulge 0r bellv inwardly excessively during the rise
and fall of the roof, and when the roof ‘is in its
uppermost position, said means or mechanism
being of such construction and arrangement that
it accomplishes this highlydesirable result. with
out subjecting the sealing ‘element to excessive
friction or causing said element to wear rapidly,
due to‘ relative vertical movement between ‘said .
means and the element C. Preferably, the means
example.’ abnormal. evaporation oi-the sea-ling
liquid C' might cause the stored linuid X to exert
an outward force on the sealingelement C4.» tend
ing to cause said element to rub on the sidewall
of the tank. therebvretardingethe upward move-1
ment of the roof and subjecting the sealing ele
ment C to excessive wear. In'tbe form of my
invention herein illustrated the means rlast=re
ferred to that is used tocontrol or-limit outward
?exing of the sealing element- C,- consists ‘of one
or- more annularshaped tension members 3 sus
or mechanism just‘ mentioned is of general con
struction or character described in my compan
ion application Serial No. 515,613, ?led ofv even
date herewith, and consists of a collapsible bar
pended by chains or- other-suitable ?exible de
vices 4 from the peripheral edgeof the roof B,
rier, fender, or fence suspended fromthe periph
If, during the‘upward travel of the roof. or when
at a point on'the outside of the'fabric element-7C.
the roofis in its uppermost position, the sealing
eral edge of the ?oating roof B at a point‘be
element C tends to bellyv outwardly, excessively;
tween the sealing element 0 and the ‘center vof
the roof, and ‘composed of'a plurality of super 65 the tension member or members 3 take up the
imposed, annular-shaped" compression members
outward force exerted on the element C; and pre
I, joined to each other and suspended from the
underside of the roof by groups of flexible sup
porting devices 2. The compression members I
can be conveniently formed from metal pipe or
tubing, vbent ‘to form ring-shaped members ‘of a
diameter only slightly ‘less than the ‘diameter ‘of
the roof‘B, ‘and the ?exible supporting devices
‘2' can beformed from strips of suitable ?exible
vent the same from rubbing againstethe side Wall
material, ortfrom pieces of,chain,,orl cable, cov
of
the
container.
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Having thus described my’ invention, what'I
claim as new “an'ddésire 'tQF's'e'c'ure by Letters
1. Ina liquid’storage‘apparatus, the ‘combinal
tion of a container for'holding the liquid-"being
stored, a ?oating ‘roof sustained bythezst'cired
liquid, T an annular, ?exible,‘ liquid-impervious
2,408,538
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sealing element attached to the peripheral edge
ing loop which is open at its upper end, a body
of mobile liquid that is adapted to ?ow into and
out of the loop of said sealing element and into
and out of the space between said element and
the side wall of the container during the rise and
fall of the roof, ‘and a trough for holding said
mobile liquid when the roof is in its lowermost
position, said trough being formed by said seal
of the roof and to the side wall of the container
substantially midway of its height so that in the
extreme high and low positions of the roof said
element will be distended or stretched in sub
stantially parallel relation to the side wall of the
container and in an intermediate position of the
roof said element will form a downwardly hang
ing element, by the peripheral portion of the roof,
ing loop which is open at its upper end, a body of
mobile liquid that is adapted to ?ow into and out 10 and by an upwardly-projecting part on the roof
located adjacent the peripheral edge of the roof.
of the loop of said sealing element and into and
3. A liquid storage apparatus of the kind de
out of the space between said element and the
scribed in claim 1, provided with a barrier for
side wall of the container during the rise and fall
preventing excessive bulging of said ?exible seal
of the roof, and a trough that is adapted to hold
said mobile liquid, the bottom and one side wall 15 ing element, said barrier being composed of a plu
rality of superimposed, horizontally-disposed,
of said trough being formed by portions of the
ring-shaped compression members joined to each
roof and the opposed side wall of said trough
being formed by the ?exible sealing element
other and suspended from. the underside of the
when the roof is at or near its extreme low posi
roof by ?exible supporting devices.
tion and by the side wall portion of the container 20
4. A liquid storage apparatus of the kind de
scribed in claim 1, provided with a vertically
collapsible barrier suspended from the underside
of the roof for preventing excessive inward bulg-'
ing of said ?exible sealing element, said barrier
being composed of a plurality of superimposed,
horizontally-disposed, ring-shaped compression
members, and an independent barrier for restrict
ing excessive outward ?exing of said sealing ele
when the roof is at or near its extreme high
position.
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2. In a liquid storage apparatus, the combina
tion of a container for holding the liquid being
stored, a ?oating roof sustained by the stored
liquid, an ‘annular, ?exible, liquid-impervious
sealing element attached to the peripheral edge
,
of the roof and to the side wall of the container
substantially midway of its height so that in the
ment, mounted on the roof so as to occupy a po
extreme high and low positions of the roof said 30 sition between said sealing element and the side
wall of the container during a portion of the cycle
element will be distended or stretched in sub
of operations of the roof.
stantially parallel relation to the side wall of the
container and in an intermediate position of the
JOHN H. WIGGINS.
roof said element will form a downwardly hang
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