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Патент USA US3033422

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May 8, 1962
A. F. FINO ET AL
3,033,413
MAGNETIC SEAL FOR FLOATING RooF
Filed April 21, 1961
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INVENTOR
Ä/amzzaêfífïwá
ATTORNEYS
May 8, 1962
A. F. FlNo ET AL
3,033,413
MAGNETIC SEAL FOR FLOATING ROOF
Filed April 2l, 1961
3 Sheets-Sheet- 2
INVENTORÓ`
Ähm/m2105752@ fr*
ATTORNEYS
May 8, 1962
A. F. FINO ET AL
3,033,413
MAGNETIC SEAL FOR FLOATING ROOF
Filed April 2l , 1961
3 Sheets-Sheet 3
î,
INVENTORÖ
ÄZe izda/1f'15220#
¿ruim
ATTORNEYS
States
fre
3,033,413
Patented May 8, 1962
2
v
3,033,413
MAGNETIC SEAL FOR FLOATIYG RÜUF
Alexander F. Fino and .lohn M. Swich, Warren, Pa., as
signers to Pittshurghnßes Moines Steel Company, Pitts
burgh, Pa., a corpcration of Pennsylvania
Filed Apr. 21, 1961, Ser. No. 104,749
9 Claims. (Cl. 2ML-26)
which are located in the rim space area and which, as
a result, take up a certain amount of physical space
therein. This type of connecting means includes some
sort of resilient or spring means for urging the conven
tional seals into engagement with the tank wall, there
fore, considerably restricting the- amount of physical
movement of which the seal is capable. Consequently,
under aggravated conditions such as unusual discrepan
This invention relates in general to floating covers or
cies in the contour of the tank wall, seals which employ
roofs for tanks and pertains, more particularly, to novel
sealing means therefor.
such types of connecting Vapparatus cannot properly and
effectively achieve their desired end result since their
It has been a problem in the art for many years to as
sure an effective and adequate seal between floating roofs
and the tanks within which they are con-lined and
movement and conforming adjustment do not have a suffi
cient degree of freedom to enable them to eñect the
proper seal under aggravated conditions. According to
which they protectively cover. This is due to many fac~ 15 the present invention, however, all connecting apparatus,
tors, including such Variables as uniformity of the tank
clips, springs and the like which are usually located vin
Wall structure and weather conditions such as, for ex
thev rim space area are eliminated, and the magnetic
ample, the presence or absence of ice and snow. lt is,
means of the present invention provides for the automatic
in general, conventional to employ a roof structure which
adjustment of the seal whereby it may achieve »at all times
is of smaller diameter than the inside diameter of the 20 a proper and highly efficient sealing action.
tank and to provide extending radially therefrom some
Additionally, the seal in accordance with the present
invention is not restricted in physical limits to expansion
tank wall to form the proper seal. However, such ilex~
or contraction and accommodates for variations in dis
ible sealing means are usually of a fairly complex nature
tances between the roof and the wall of the tank with
and are generally formed entirely separately from a sec 25 in those limits which would normally be encountered
ondary sealing means normally referred to as a weather
in service regardless of the degree of variation within
shield which tends to deflect water and other precipita
such practical limits. The present improved magnetic
tion or foreign material centrally towards the physical
means will follow the tank wall for all required varia
confines of the roof itself and away from the space be
tions, Whereas with other conventional seals, the con
tween the roof and the tank. Although weather shields 30 formity thereof with the surface of the tank wall is lim
may be of a relatively simple construction and design
ited lby the action of the mechanical device exerting an
such as will permit their easy removal and inspection,
outward or spring force on the seal or by the internal
»generally flexible means which engages the inside of the
the primary seals which are usually located adjacent the
supporting structure of the sealing mechanism.
lower edge of the roof are normally of such complexity,
A further object of the present invention is to provide
size and character as to preclude a ready inspection and 35 an improved seal for the floating roofs of tanks in which
removal thereof while the tank is in service.
the seal assembly interposed between the roof and its
It is, therefore, of primary concern in conjunctionwith
associated tank embodies in association with inner and
the present invention to provide an improved form of
outer llexible curtain members, annular bands of mag
seal for the floating roofs of tanks which will be entirely
netic character associated with the inner surfaces of said
adequate and effective in service and which, at the same 40 curtain elements for attraction toward the adjacent tank
time, is capable of inspection and removal while the tank
wall and roof structure to impose compression of the
is in service, these results being achieved by virtue of
curtain elements against the associated tank wall and
the use of an improved magnetic means for achieving the
roof and wherein additional auxiliary magnetic means
sealing effect.
are provided for concentrating such pressure of the outer
Another object of this invention is to provide an im
curtain element against the adjacent tank wall along a
proved seal for the floating roofs of tanks in which the
prescribed annular line.
seal assembly is an integrated assembly, including not
More particularly the present invention has for its ob
only a weather shield, but also a primary seal capable
ject to provide a new and novel means for supporting
of accommodating for variations in the diameter of the
magnetic elements along an annular line and against the
tank at various elevations therein and in which there 50 inner surface of the magnetic band which is disposed l
is a peculiar and specific cooperation, hereto-fore unknown,
against the inner side of that curtain which lies against
between the primary seal and the weather shield render
the inner surface of the tank outer wall.
ing both seals as a unit more effective and adequate.
A further object of this invention is to provide a novel
arrangement of component parts for effecting a seal be
tween a floating roof and its associated tank and in
which certain flexible elements are so physically asso
ciated with each other and with magnetic means as well
The invention arrangement is also highly advantageous
due to the novel construction thereof which permits the
roof itself to rise above the upper edge of the tank while
maintaining an effective seal therewith thereby enabling
the utilization of the full storage volume of the'tank.
This is accomplished by providing a novel means of sus
as a relatively stiff weather shield as to »admirably perform
pending the sealing means from the root` whereby the
a sealing action under any and all conditions and in con 60 portion of the seal which engages the tank wall when
junction therewith, tnere being magnetic anchoring means
the roof is above the top edge of the tank is effectively
of a novel form tending to prevent damage to the seal
supported by a portion of the weather shield of the seal
during downward movement of the roof should frozen
ing means.
moisture accumulate between the seal and the tank tend~
ln the drawings:
ing to adhere the two together.
65
FIG. l is an elevation partly broken away of a storage
Further, it is an object of this invention to provide
tank with a floating roof therein showing the improved
a novel seal assembly in lwhich the same may be easily
novel magnetic sealing means operatively associated with
inspected and replaced during the time when the tank is
the roof of the tank.
in service.
IG. 2 is an enlarged perspective broken away view
Further in connection with the instant invention, it is 70
of a portion of the roof and tank illustrating the manner in
to be understood that existing seal structures normally em
whichthe sealing means is operatively mounted between
ploy connecting apparatus, clips, springs and so forth
3,033,413
3»
4
the roof and tank wall with the roof structure in a lowered
mediate portion 18 to provide the characteristics men
tioned above. This natural resilience of portion 19 nor
mally tends to carry the outer edge of the weather shield
position.
FIG. 3 is another enlarged perspective view partially
broken away and corresponding to FIG. 2 but illustrating
the roof extending above the upper edge of the tank.
FIG. 4 is a sectional view illustrating a portion of the
tank and roof structure with the magnetic sealing means
in operative lowered position within the tank.
toward the inner surface of the tank so as to produce a
FIG. 5 is a sectional view corresponding to FIG. 4 but
16. The curtain means also includes an outer portion 22
seal with the tank. An annularly extending curtain means
provides the primary seal between the roof and the tank,
the curtain means including an inner portion 20 having
the top edge thereof seated upon the upper edge of flange
illustrating the roof in position extending above the up l0 disposed adjacent the inner wall of the tank and an inter~
mediate portion 24 extending between the lower parts of
per edge of the tank.
portions 2€) and 22. As shown, portions 20, 22 and 24
FIG. 6 is an enlarged view of a portion of the structure
shown in FIG. 4 illustrating the manner of supporting the
inner portion of the weather shield.
are separate members which are suitably secured to one
another, it being evident that the various portions may be
FIG. 7 is a sectional view showing the position of the 15 formed integral as one sheet, if desired.
As seen most clearly in FIGS. 2, 3 and 6, for example,
sealing means during downward movement of the roof
an annular support strap or restraining flange 28 is pro
wherein the portion of the sealing means contacting the
vided, member 28 including an inner flange portion 29
tank may be frozen or adhered thereto and illustrating the
and an angularly disposed outer flange portion 31. The
inner flange portion 29 of the restraining flange is disposed
in overlying relationship to the upper edge 21 of the inner
portion of the curtain, and the innermost flange portion 17
sealing means illustrating a modification of the structure.
of the weather shield is disposed in overlying relationship
FIG. 9 is a sectional detail on an enlarged scale show
to inner flange portion 29. The entire assembly including
ing the attachment of a magnet supporting strap to the
bottom portion of the sealing structure.
25 the portions 17, 29, 21 and 16 are maintained in operative
position by means of threaded studs 36 which are secured
FIG. 10 is an enlarged sectional detail illustrating the
to inturned flange 16, the studs extending up through suit
individual magnet supporting pockets carried by the outer
able openings in the various members and through open~
curtain.
ings in an annular clamping plate 17' disposed in overlying
FIG. 11 is an enlarged perspective corresponding to
relationship to the inner portion 17 of the weather shield.
FIG. 2 and illustrating another means of mounting auxil
Suitable nuts 37 are mounted on the upper ends of
iary magnetic elements along the inner side of the outer
threaded studs 36 for maintaining the entire assembly in
magnetic band.
tight sealed relationship.
The present application is based upon our allowed prior
An upper annular edge portion 22' of the outer portion
application Serial No. 6,764, filed February 4, 1960, and
effect of the auxiliary magnetic means coacting with the
magnetic band.
FIG. 8 is an enlarged view 0f the lower portion of the
now Patent No. 2,981,436, and FIG. 1 of the drawings 35 22 of the curtain is secured to the flexible outer portion 19
of the weather shield by cementing or the like to support
illustrates a conventional tank indicated generally by the
the outer edge of the curtain from the upper edge portion
reference numeral 10, which is adapted to store gasoline,
of the weather shield. Preferably, the curtain means in
oil and the like, the tank being of conventional construc
cluding portions 241i, 22 and 24 are formed of synthetic
tion and including an outwardly extending flange 10' at
sheet or flexible plastic or like material.
the upper end thereof defining the upper edge portion of
The means of the present application for retaining the
the tank. A floating cover or roof is indicated generally
inner and outer portions 20 and 22 of the curtain means
by reference numeral 11, the roof being of substantially
in sealing contact with the tank and roof comprises mag
circular configuration and having a diameter less than that
netic means embodying outer and inner units 23 and 30
of the tank, the sealing means of the present invention
respectively.
being adapted to seal the annular space between the :roof
The cylindrical wall 12 of the roof as well as the wall
and the tank. The roof or cover floats on the upper sur
of the tank are formed of steel or similar metallic ma
face of the tank in a well-known manner, and accordingly
terial whereby the magnetic units 23 and 30 are continu
rises and falls with the level of the liquid within the tank.
ally attracted thereto.
The roof 11 is of relatively simple construction and in
Each of the magnetic means embodying the units 23
cludes a cylindrical outer wall 12, a lower circular wall
and 3€) defines an annular band or strip of magnetic ma
13 being sealingly secured to the lower edge of wall 12,
terial which has a substantial width and is of relatively
and an upper circular wall 14 being secured to the inner
small thickness as will be seen particularly upon refer
surface of wall 12 at a point spaced below the upper edge
ence to the drawings, each such means extending in the
thereof. It will be noted that the upper edge of cylin
form of the annular strip within the curtain means. Each
drical wall 12 includes an inturned annular flange 16.
As mentioned previously, the sealing means of the pres Ul 5 of the annular strip forming means may comprise a plu
rality of short sections or short strips placed in end-to
ent invention includes a weather shield which slopes up
end relationship with one another, the inherent magnetic
wardly and outwardly of the roof in such a manner as to
characteristics of the sections maintaining them in such
cause rain water and such to drain toward the center of
relationship one with the other and in proper operating
the roof whereat it is removed from the roof by conven
tional means (not shown). The sloping weather shield of 60 position. The annular magnetic units may be formed
each in a continuous piece or in the short sections re
the present invention is of annular configuration and in~
ferred to of a suitable magnetic roof-like material which,
cludes an inner marginal edge 17 and an angularly related
for example, may comprise a product named “Denmag”
intermediate portion 18 which is of relatively stiff construc
tion such that it will remain in the proper operative posi 5 made by the Deriman Rubber Company, PD. Box 951,
Warren, Ohio.
tion as shown in the drawings during operation. An outer
The magnetic means comprised in the units 23 and 30
marginal edge portion 19 extends integrally from the
may also be formed of annular bands of flexible magnetic
outer edge of intermediate portion 18, the outer edge
material as disclosed in Patent No. 2,627,097 to R. Ellis,
portion being considerably more flexible than the inter
issued February 3, 1953, wherein the flexible strips are
mediate portion 18, and being so constructed and arranged
formed of rubber or similar material having magnctizable
that it inherently tends to flex outwardly due to its natural
particles inherently mixed therein.
resilience.
The structure thus far described for maintaining the
The weather shield is preferably constructed of rubber
curtain sections 21 and 22 in operative relationship with
or similar material and the outer marginal edge portion
19 is preferably provided with more rubber than the inter 75 the roof wall 12 and the tank wall surrounding the roof
3,033,413
6
functions satisfactorily under normal conditions. How
ever, under` certain unusualV operating conditions a higher
of the roof wall 12. These straps and the means for Vat
taching. the sa'me to the bottom of the roof serve the
magnetic attraction is required for penetration through
purpose hereinafter described.
heavy crude residues which may accumulate on the tank
wall. Accordingly, a means is provided for augmenting
the action of the magnetic material comprised inthe mag
netic> means described, particularly in the unit 23 thereof.
One such means for augmenting the magnetic action of
Y
Referring now to FIG. 8 of the drawing, a modification
is illustrated wherein like portions yhave been indicated
by the same reference numerals primed. The sealing
means between the roof wall 12’ and the’ tank wall 10’
includes a curtain formed of an inner portion Ztl', an in
termediate portion 24’ and an outer portion ‘22a which are
prises the application to the inner side of the strip or band 10 supported in the same manner discussed in connection
with the aforede'scribecl modification.
of a number of permanent magnet supporting pockets in
Inner and outer sealing means 30" and 23’ embodying
each of which a permanent magnet is placed.
annular bands are similar to sealing means 30 >and 23 re
In the structure here illustrated the annular band dis
spectively as> described hereinbefore, the primary distinc
posed against the inner side of the outer apron portion 22
has applied thereto two circular rows of pockets 123 15 tion of this modification over the previously described
modification being the provision of an annular strip of
which may be formed of suitable rubberized fabric or
the band or annular strip embodied in the unit 23 com
rubber material vulcanized to the band section and having
material 4t) which may havea substantially rectangular
cross-section as shown and including opposite faces 41 and
42 which are disposed in abutting relationship with the
Alnico. As stated, these auxiliary magnet bodies may be 20 adjacent surfaces of magnetic means 30’ and 23’ respec
tively. Body means 40 may be formed of a suitable ma
arranged in l, 2 or more circular rows on the inner side
terial such as polyethylene foam and is adapted to serve
of the annular strip or band forming a part of the unit 23.
as a spacer for maintaining the annular bands of the seal
In place of the individual magnet units’24 disposed in
ing means in the spaced position as shown so that the
pockets 123'use may be made of tubular members 125 as
shown in FIG. ll disposed against and around the inner 25 sealing means wiil be maintained in the operative posi
tion shown in FIG. 8 during normal operation of the
surface of the annular band forming a part of the unit 23
apparatus.
and which tubular bodies are iilled with magnetic powder
Y eferring again to FIG. l, the roof is disclosed in its
126 and are secured in place upon the supporting annular
an open top for the >reception of a concentrated magnet
body 124 such, for example, as the magnet known as
band by suitable straps 127 looped over the tubes and at
normal operative position wherein the roof is disposed
tached as by welding or any other suitable manner to vthe 30 below the upper edge 10' of the tank. In this position,
the resiliency of portion 19 of the weather shield urges
supporting band body.
y
this outer edge of the weather shield as well as the rce
While the magnet bodies 124 illustrated as disposed in
individual pockets, each of which is attached directly to
mented portion of the upper part 22' of the curtain against
the inner `face of the supporting annular strip, such pockets
the inner surface of the tank to effect a good seal there
may be joined to a separate band or ribbon which in turn 35 with.v It is evident 'that the resilient outward force of
portion 19 tends to take up variations in the space be
may be attached to the annular strip of magnetic material.
tween the roof and the inner wall of the tank. As men
In assembling the apparatus the inner edge of the inner
curtain portion 20 is iirst vclamped in operative position by
means of the plate 17’ whereupon the magnetic units 23
tioned previously, it is a particular object of the invention
to provide an arrangement which permits maximum uti
and 30 are inserted in their operative position whilev hold 40 lization of the storage space within the tank itself. This
ing the upper edge of the portion 22. The two annular
isV accomplished in the present invention due to the fact
magnetic units 23 and 30 will be maintained in their
that magnet unit means 23 comprising the annular band
proper operating position by the magnetic attraction be
and auxiliary magnet elements will retain the outer por
tween these units and the adjacent walls of the roof and
tion 22 of the curtainin sealing engagement with the wall
the tank. The upper e-dge portion 22' of the curtain 22 is 45 of the 'tank even when the roof has moved a substantial
then cemented in operative position as previously de
distance above the upper edge of the tank as illustrated for
scribed. The apparatus is then fully assembled for opera
example in FIGS. 3 and 5. This mode of operation is
tion and as will be apparent from the foregoing descrip
possible due to the novel manner of suspending the outer
tion with the inclusion _of the additional magnetic ele
portion of the curtain from the outer edge of the weather
ments 124 or 126 on the inner surface of the outer annular 50 shield. The weather shield although being of relatively
band the outer curtain 22 will be pressed with greater
flexible construction is enabled to support the curtain seal
force against the inner surface of the tank wall along
in operative position due to the fact that the intermediate
two annular paths or lines which the rows of magnets 124
portion 18 thereof is of relatively stiff construction, vthe
or the magnetized powder >carrying tubes 125 deñne.
stiffness of the intermediate portion 18 being enhanced
The bottom portion 24 of the curtain structure is pref 55 by the provision of reinforcing ribs R as seen most clearly
erably provided with a width which, when in the opera
in FIGS. 2 and 3, which extend outwardly ‘of the roof
tive position shown, is substantially greater than the nor
along the major' part of intermediate portion 18 of the
mal spacing between the outer portion of the roof and the
washer shield, the ribs R being located at spaced circum
inner portion of the tank wall. This permits the dimen
ferential points along the weather shield. ‘Ribs R may
sion of the annular space to vary within wide limits 60 comprise a suitable rigid means such as metallic strips or
thereby compensating for eccentricity of the roof with
bars which are suitably secured to the material vof inter
respect to the tank without pulling the magnetic units
mediate portion 18 of the weather shield. Injaddition,
23 or 30 from a point 'adjacent to the associated walls
the outer flange portion 31 of restraining flange 2.8k further
of the roof and the tank secured to the curtain struc
supports the inner 'part of intermediate portion 18 togen
ture entirely around the bottom portionthereof adjacent 65 sure Vthat it remains in the upright position lillustrated in
to the bottom edge of the inner portion 2t) by a plurality
FIGS. 3 and 5 when the roof rises above the upper edge
of circumferentially spaced straps 25 vulcanized or other~
of the tank. It will be observed that when the tank is
,wise suitably secured to the bottom portion 24. Each of
in such elevated position, the outermost portionV 19 of the
these strips has a free end to one side of which is at
weather shield bows outwardly due to its natural resilience.
tached a pocket 225 in which is placed a permanent mag 70
As seen most clearly in FIGS. 2 and 4, whenthe seal
net such as the Alnico magnet hereinbefore referred to.
ing means is in normal operation, the lower part of the
The pockets containing the magnetsare disposed on the
outer curtain. portion 22 will be urged into sealing en
proper side of the strap 25 whereby the magnet can be
gagement with thejwall of the tank by the magnetic unit
placed against the bottom wall 13 of the roof structure by
means 23 embodying the annular outer` band and the
additional magnetic elements 124 or 125 and the upper
drawing the strap down and across the iiange portion 13’
3,033,413
47
8
part of the outer portion 22 will normally hang in the
of the desired contact between the curtain and the tank
wall under those conditions where heavy crude residues
position shown such that it is spaced a small distance from
the inner wall of the tank, this space being indicated by
letter S.
During downward movement of the roof as, for exam
may accumulate on the tank wall or tank sill.
The apparatus of the present invention is relatively
simple and economical in construction, and yet is effective
and reliable in operation.
ple, as shown in FIG. 7, there will be a tendency for the
roof to move first without imparting a corresponding
movement of the outer curtain portion 22 and this can
As this invention may be embodied in several forms
without departing from the spirit or essential character
occur to varying degrees depending upon conditions until
istics thereof, the present embodiment is therefore illus
trative and not restrictive, and since the scope of the
such a situation as is specifically shown in FIG. 7 occurs.
In FIG. 7, the roof has moved downwardly a suflicient
extent to impart substantially a taut condition to the bot
tom portion 24 of the curtain which tends to pick the
lower extremity of the outer curtain portion 22 away
from the surface of the tank as indicated by the reference
character 35.
At the same time, as soon as the bottom
portion 24 is fully tensioned, a further and further peel
ing action of the curtain 22 will occur until the entire cur
tain may become tensioned. This is particularly advan
tageous should the outer curtain become frozen to the
tank as can sometimes occur in cold weather.
In this
invention is defined by the appended claims, all changes
that fall within the metes and bounds of the claims or
that form their functional as well as conjointly coopera
tive equivalents are therefore intended to be embraced by
those claims.
We claim:
l. A seal for a floating roof tank in which a generally
cylindrical tank is provided with a cylindrical floating
roof therewithin of a diameter less than the inside diam
eter of the tank, the seal comprising an annular relatively
stiff weather shield flexibly connected at its inner mar
ginal edge to the roof structure and having a flexible
case, the sealing action shown in its initial stages in FIG.
marginal outer edge for sealing engagement against the
7, will very advantageously separate the outer curtain from
inner surface of the tank, an outer curtain of flexible
the tank without imparting undue strain thereto such as
might otherwise occur were not the peeling action present. 25 material in the form of an annular band secured along its
upper marginal edge adjacent the outer marginal edge of
On the other hand, during downward movement of the
said weather shield and hanging therefrom in close prox
deck or roof, it will be appreciated that the relatively stiff
imity to the inner surface of the tank, magnetic means
weather shield 18 will move downwardly relatively quick
carried by said outer curtain along the lower marginal
ly and substantially instantaneously as the deck or roof
moves down. Should, however, the weather shield be 30 edge thereof attracting the curtain toward the inner sur
face of said tank, an inner curtain in the form of an
frozen to the tank, the weight of the roof will positively
annular band of flexible material secured along its upper
peel the weather shield away from the tank wall and a
marginal edge to the roof structure and hanging there
continued peeling action will also occur as the roof drops
from from a point adjacent the point of attachment be
further.
This continued peeling action by the weather shield will 35 tween the inner marginal edge of the weather shield and
the roof, magnetic means carried by the lower marginal
pull that part of the curtain portion 22 which is above
edge portion of said inner curtain attracting the same
magnet unit means 23 away from the wall of the tank.
toward said roof structure, a flexible bottom sheet in the
The magnetic unit means 23 has sufllcient weight so that
form of a generally horizontal annulus having its inner
it always tends to slide down along the tank shell and
accordingly, the adjacent area of the outer curtain portion 40 and outer edges secured respectively to the inner and outer
curtains, strap means secured to and hanging from the
22 will tend to pull away from the tank wall. It will be
lower marginal edge of said inner curtain, there being a
evident that when it is desired to inspect the seal struc
permanent magnet carried by each strap means adapted
ture, a person can reach down through the space between
to secure the strap means to the underside of the roof.
the roof and the tank to detach the magnets 226 carried
2. In a liquid storage tank having a cylindrical outer
by the straps 25 from the bottom of the tank. The en
wall and a cylindrical floating roof therewithin with there
tire curtain structure may then be pulled up out of the
being an annular space between the roof and the inner
annular space between the roof and the tank for inspec
surface of said wall, a seal assembly carried by said roof
tion and for removal or replacement, if necessary.
and engageable with the inner surface of said outer wall,
It is apparent that there is provided according to the
said seal including a weather shield extending upwardl
present invention a new and novel magnetic sealing means 50
and outwardly from the periphery of said roof for con
for floating roofs wherein the sealing means includes a
tact along its outer edge with the inner surface of said
flexible weather shield and a highly flexible curtain means
outer wall, inner and outer flexible curtain members
which is maintained in sealing relationship with the walls
attached adjacent the inner and outer edges respectively
of the roof and tank by novel magnetic means. The seal
of said weather shield and hanging therefrom respectively
ing means is free to flex or be tensioned under different 55
along the outer surface of said roof and the inner surface
conditions depending on the direction of movement of the
of said outer wall, a flexible bottom sheet interconnecting
roof, and regardless of the relative positions of the mem
said curtains along the lower edges thereof, magnetic
bers, an effective seal is maintained between the roof and
band means disposed against and carried by said curtains
tank at all times. The construction permits the roof to
adjacent to the lower edges thereof for holding the latter
rise a substantial distance above the upper edge of the 60 in engagement respectively with said roof and said inn'er
tank thereby providing a maximum utilization of the stor
surface of the outer wall, and auxiliary magnetic units
age space within the tank and at the same time an effec
tive seal is maintained with the tank.
It will also be seen from the foregoing description that
the mounting upon the inner surface of the band unit 23,
of additional magnetic means either in the form of the
individual strong magnets 124 arranged in the circular
order described or the tubular bodies 125 filled with mag
carried by that magnetic band means which is attached
to the outer flexible curtain member, said auxiliary mag
netic units being positioned upon the side of the said
carrying means remote from the outer wall.
_
3. In a liquid storage tank having a cylindrical outer
wall and a cylindrical floating roof therewithin with 'there
being an annular space between the roof and the inner
surface of said wall, a seal assembly carried by said roof
70
annular band so that along the circular path where this
and engageable with the inner surface of said outer wall,
additional magnetic means is placed the outer curtain 22
said seal including a weather shield extending upwardly
netic material, will augment the magnetic action of the
will be pressed with increased force against the tank wall.
This additional pressure or force applied to the curtain
and outwardly from the periphery of said roof for con
tact along its outer edge with the inner surface of said
against the outer wall of the tank, augmenting the pres
sure of the annular band will result in the maintenance 75 outer wall, inner and outer flexible curtain members at
3,033,413
10
tached adjacent the inner and outer edges respectively of
‘said weather shield and hanging therefrom respectively
tion fixed to said roof underlying said inner marginal
edge portion of the weather shield and having a rigid
upwardly and outwardly directed outer edge portion un
derlying a portion of said intermediate portion of thev
along the outer surface of said roof and the inner surface
of said outer wall, a flexible bottom sheet interconnecting
said curtains along thel lower edges thereof, magnetic
weather shield to support the same when its outer mar
_means attached to the lower edges of said curtains for
holding the same in contact respectivelyl with said roof
ginal edge portion is out of contact with said outer Wall,
a plurality of straps fixed to the lower edge of said inner
curtain and depending therefrom, means »forming a
pocket at the terminus of each strap, and a permanent
and the inner surface of said outer wall, said magnetic
means being in the form of annular bands of rubber hav
ing magnetic particles embedded therein, and auxiliary
magnetic units secured to that band which is attached to
the curtain having contact with said outer wall, said aux
iliary magnetic units being on the side of the latter band
remote from the outer wall and functioning to augment
10
magnet in each pocket for magnetically connecting the
strap to said roof.
.
6. In combination, a substantially cylindrical tank, a
substantially cylindrical floating roof disposed in said
tank and having an outer diameter less than the inner
the magnetic action of the band to increase the pressure 15 diameter of said tank, and sealing means disposed be~
along a relatively narrow line with which the curtain is
tween said roof and said tank, said sealing means com
held in contact with the outer wall.
prising an annular weather shield means secured to the
4. In a liquid storage tank having a cylindrical outer
upper portion o-f said roof and extending upwardly and
Wall and a cylindrical floatingiroof therewithin with there
outwardly with respect to said roof for engagement with
being an annular space between the roof and the inner 20 the inner surface of said tank and being of a relatively
surface of said wall, a seal assembly carried by said roof
stiff material, curtain means supported by said roof and
and engageable with the inner surface of said outer wall,
including a first inner portion, the inner portion being
said seal including a weather shield extending upwardly
supported at the upper outer edge portion of the roof and
and outwardly from the periphery of said roof for con
depending adjacent to the outer surface of the roof, said
tact along its outer edge with the inner surface of said 25 curtain means including `an outer portion supported on
outer wall, inner and outer iìexible curtain members at
the upper outer edge portion of said weather shield and
tached adjacent the inner and outer edges respectively of
said weather shield and hanging therefrom respectively
depending adjacent the inner surface of said tank, said
inner and outer portions being joined by an intermediate
along the outer surface of said roof and the inner surface
portion, and magnetic means associated with said inner
of said outer wall, a flexible bottom sheet interconnecting 30 portion and said outer portion for retaining said inner
said curtains along the lower edges thereof, magnetic
means attached to the lower edges of said curtains for
holding the same in contact respectively with said roof
and the inner surface 0f said outer wall, a plurality of
and outer portions in contact with the outer surface of
said roof and the inner surface of said tank respectively,
said magnetic means including a first substantially annu
larly extending body of magnetic material having a sub
straps lixed to the lower edge of said inner curtain and 35 stantial width and a relatively small thickness, said first
depending therefrom, and a permanent magnet unit car
body of magnetic material engaging the inner surface of
ried by and at the end of each strap for connection by
said outer portion, said magnetic means also including a
magnetic attraction with and to secure the strap» to the
second substantially annularly extending body of mag
roof.
netic material disposed in engagement with the surface
5. In a liquid storage tank having a cylindrical outer 40 of said inner portion which is opposite to the sur-face
wall and a cylindrical floating roof therewithin with there
thereof in engagement with the outer surface of said
being an annular space between the roof and the inner
roof, and auxiliary magnetic means supported upon the
surface of said wall, a seal assembly carried lby said roof
inner side of said first body along a relatively narrow
and engageable with the inner surface of said outer wall,
line between the edges thereof for augmenting the pres
said seal including a weather shield extending upwardly 45 sure along such line with which the curtain means inner
and outwardly from the periphery of said roof for con
portion is held against the inner surface of the tank.
tact along its outer edge with the inner surface of said
7. The invention according to claim 6, wherein the said
outer wall, inner and outer flexible curtain members at
auxiliary magnetic means comprises a plurality of strong
tached adjacent the inner and outer edges respectively of
permanent magnets.
said weather shield and hanging therefrom respectively 50
8. The invention according to claim 6, wherein said
along the outer surface of said roof and the inner surface
auxiliary magnetic means comprises a tubular body ñlled
of said outer wall, a flexible bottom sheet interconnecting
with magnetic material.
said curtains along the lower edges thereof, magnetic
9. The invention according to claim 6, wherein said~
means attached to the lower edges of said curtains for
auxiliary magnetic means comprises a plurality of strong
holding the «same in contact respectively with said roof 55 magnetic members and the support for said magnetic
and the inner surface of said outer wall, said weather
members comprises upwardly opening pockets secured to
shield having a ilexible inner marginal edge portion fixed
the said lirst body whereby said magnetic members may
to said roof, a stiff intermediate portion and terminating
be readily placed in operative position upon and re
at its outer marginal edge in a iiexible portion for de
moved -from said ñrst body.
formed engagement with the inner surface of said outer 60
wall, a supporting strap having a rigid annular inner por
No references cited
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