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Патент USA US2411262

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Nov. 19, 1946.
2,41 1,262
P. S. GRAVER
COUNTERBALANCED EXPANSION ROOF
Filed Feb.‘ 7, 1944
2 Sheets-Sheet l
il‘aLFTI-
“PJ____ ____
mm
INVENTOR.
P/zzZLpé.‘ Graver;
Patented Nov. 19,_ 1946
2,411,262
UNITED STATES PATENT OFFICE
COUNTERBALANCED‘ EXPANSION ROOF‘
Philip S. Graver, Chicago, 111., assignor' to Graver
Tank & Mfg. 00., Inc., East Chicago, Ind.,> a
corporation of Delaware
Application February 7, 1944, Serial No. 521,334
7 Claims.
(01. 48-176)
1
2
The‘ invention relates to storage tanks having
movable roofs and has reference more particu
larly to improved counter-balancing means for
such movable roofs.
The Graver Patent 2,277,398 granted March 24,
1942, discloses‘ a storage tank for volatile liquids
the‘ manner of attaching the sheaves and cable
tothe tank and roof.
,
Referring‘ to the’ drawings, the invention is‘ il->
lustrated as applied to an expansion roof tank
having a‘cylindri'cal wall H}, a. bottom H» which:
may‘ rest directly‘ on. the‘ earth or‘other suitable,
support, and a‘movable roof designated invits en->
having a roof capable of vertical movement‘ to
vary the vapor space within“ the tank. Since the
tirety by numeral 12. Thecylindrica} wall I I] and.
roof of the storage‘tank, as shown in said patent,
bottom H provide an open" top‘ tank which is
will operate at pressures‘ higher than the maxi-l 10 closed by‘ the movable‘ roof to retain gases or liq
mum safety pressure for cone roofs of tan'ksicone
ids withinthe structure; The movable roof is
nected to it, it is desirable to reduce the operating
of the bell holder type and- accordingly the cylin-l
pressure on said movable roof. Accordingly, an"
drical wall Ill of the tank is provided‘ with a
object of the present invention is to" provide im
launder l3 including" a base or bottom member
proved counter-balancing means for reducing the
formed by the angle’ l4 suitably secured as by
operating pressure on expansion roofs which may
welding to the cylindrical wall of the tank. ‘The
be located either exteriorly or interiorly of‘ the
launder is located exteriorly of the tank adjacent
tank with the individual weights-‘spaced circum
the upper portion thereof and the Vertical wall‘ I 5‘
ferentially of the same.
'
of ‘the launder is reinforced by the angle. mem
A further object is to provide improved counter 20 her to suitably secured as by welding to the top.
balancing means for expansion roofs wherein the‘
edge‘ of th'e'wall l5 and located‘ exteriorly of the
counterweights willhave» movement/in a vertical
same; The‘top edge of the cylindrical wall Ill isv
likewis‘ereinforcedby the angle member I‘! hav-‘
direction which will be twice the distance travelled
ing location within the'tank. and extending‘ cir
by the roof, but wherein the said counterweights
as a, result will be only one-half the weight that ‘ ~ c'umferentially thereof ‘.
would be otherwise required.
‘
The movable roof essentially consists of a cen~
ter portion i8 covering the entire area'of the open
A further and more speci?c object is'to'provi'de
counter-balancing means for an expansion roof
top tank‘structure. i Said center portion l8 may
have thegeneral shape of a ?attened‘ cone, as best
including an. arrangement of double sheaves,‘
30
shown in Figure 1'. A peripheral portion. 20 is
cables and weights for reducing by half the re-‘
quired weight of the latter with a corresponding
welded to the circumference of the‘center‘ portion
18, the same‘extending substantially horizontally,‘
reduction in size of the cable and sheaves but
as shown in Figure 2, and projecting beyondlthe
wherein- said weights'will move ‘twice the distance
launder and‘ the angle I6 for reinforcing and
travelled by the expansion roof.
With these and other objects in view the in-' 35 strengthening the outer wall of the launder. ,The
roof is completed.- by the angle 2! located at‘the
vention may consist of certain novel features of
junction of the center portion I8 with the periph
construction‘ and operation as will‘ be more- fully‘
described and particularly pointed‘ out in the
speci?cation, drawings and claims appended
hereto‘.
eral portion ‘20. It will be {understood that the
angle 2| extends completely around the roof on
40 the underside of the same and that said angle pro
Vides’ the supporting element for the depending
In the drawings which illustrate‘ an embodi;
skirt or dip ring 22 having location within the
ment of‘ the invention and wherein like" reference
launder It.‘ The dip ring functions to seal the
characters are used to designate like parts—
interior‘
of the. tank since the launder contains
Figure 1 is an elevational view of an expansion 4
liquid and at the same time permits vertical move
tank embodying theimproved counter-balancing
means of the invention whereby the roof may ‘be
caused to operate at relatively low pressures;
Figure 2 is a fragmentary ‘vertical sectional view .
ment of the roof to take place‘.
'
Y
A depending rain shed skirt- 23-is suitably sup
ported from the outer edge of the peripheral por
tion 28. The rain shed skirt has a length almost
illustrating the arrangement‘ of double sheaves, 50 equal to that of the launder I3 and for thepur
cable and counterweight comprising the. inven
poses of the- invention the said rain shed skirt is
tion for counter-balancing an expansion roof;
suitably reinforced at intervals by the vertically
and
extending structural members 24, as shown. in
Figure 3 is an elevational view of the counters
Figure 3; The upper corner angle 25 functions
balancing means shown in’ Figure 2' illustrating
as a- securing element for joining the rain‘ shed
2,411,262
skirt to the roof and the angle 26 ?xed to the lower
edge of said skirt 23 and extending outwardly of
the same strengthens the lower edge. At intervals
around the circumference of the rain shed skirt at
those places where a counterweight structure is to
be located, said rain shed skirt is provided with a '
4
spaced relation and facilitate movement of the
same. As clearly shown in Figures 2 and 3,
each counterweight 42 carries a pair of rollers
44 disposed on the respective sides of the same.
Any suitable form of journalling and supporting
means, such as the brackets 45, may be employed,
projecting from the respective sides of the coun
terweight. The double arrangement of sheaves
makes it possible to reduce the weight of the
depending bracket member 21, the same depend
ing from and being suitably secured to angle 26.
Upward movement of the expansion roof 12
will increase the vapor space within the tank, 10 counterweights 42 by approximately one-half
which action is necessary to retain the volatile
vapors produced during the heat of the day. The
dotted line position of the roof shown in Figure 1
represents the fully expanded position of the
same. As a result of the cooler night tempera
tures the vapors are condensed and the roof ac
that which would otherwise be required for en
abling the expansion roof to operate at a pre
determined pressure.
The sheave 34 and coun
terweight 42 constitute the movable elements of
15 each arrangement. When the roof moves in an
upward direction for expansion purposes, for ex
cordingly returns to initialposition. The vola
ample, each sheave 34 will also move in an up
tile fractions of the liquid stored in the tank
ward direction, with the result that the counter
weights will travel downwardly and the degree
will thus be conserved and substantially the same
procedure takes place upon ?lling of expansion 20 of movement of each counterweight will be twice
the travel of sheave 34. With the reduction in
roof storage tanks since the ?lling operation in
creases the production of vapors which are ac
the weight of the counter-balancing means a
reduction is also secured in the size of the sheaves
commodated by upward movement of the roof.
and cable.
Unless counter-balancing means are employed
What is claimed is:
the'vapor pressure necessary to cause upward 25
1. In a tank having an expansion roof with
movement of the ‘expansion roof I2 is determined
primarily by the weight of the roof including
sealing means between the roof and the tank
the weight-of any stabilizing means having ?xed
shell, a rain shed skirt depending from the'pe
riphery of the roof and encircling the tank shell
relation therewith and which move with the
roof. However, by counter-balancing the dead 30 adjacent the upper portion of the tank, a plu
weightof- such 'a roof it is possible to secure op
rality of upper sheaves supported‘ in spaced
eration at much lower pressures. In actual prac
relation around the upper edge of the tank shell,
tice it is desirable that tanks equipped with ex
lower sheaves secured to the lower edge of the
pansion roofs'operate on‘ less than one ounce
rain shed skirt in spaced relation corresponding
per square inch pressure. If such operation can 35 to that of the ?rst mentioned sheaves, whereby’ ,
be secured‘ the expansion tank can be used to
store the vapors --from a ‘number of conventional
?xed'roof tanks.-
i
1
‘
The’ counter-balancing means of the invention
comprises counterweights which act on the roof
through the depending rain shed skirt. Thus
the counterweights are located exteriorly of the
tank. An arrangementrof double sheaves is em
certain upper and lower, sheaves are‘vertically
aligned to form pairs, cables anchored at one,
end to the upper edge of the tank shell and each
extending downwardly to pass under a lower
sheave and then upwardly to pass over an upper
sheave, and _a counterweight secured to the op
posite depending end of each cable.
‘
2. In a tank having an expansion roof with.
ployed, with the result that the counterweights
sealing means between the roof and the tank
are reduced in weight by half but are required
shell, a rain shed skirt depending from the .pe
to’ travel twice the distance travelled by the
riphery of the roof and encircling the tank shell
movable roof for each movement thereof.
adjacent the upper portion of the tank, and
' The upper sheave 3llv is suitably supported by
counter-balancing means for said roof including
means of the hanger 3| which is pivoted at 32
weights, cable means for supporting each weight
to the bracket 33. The bracket 33 is part of the 50 from the upper edge of the tank shell, and
reinforcing means for the launder since said
sheaves secured in spaced relation around the
bracket’ is suitably secured to angle I6 as by
upper edge of the tank shell and the lower edge
welding and is likewise welded along its inside
of the rain shed skirt respectively, each said cable
edge to‘w'all I5 of the launder. The lower sheave
means passing under a sheave secured to the skirt
34 is likewise supported by hanger 35 pivoted at 55 and passing over a sheave secured to the tank
36 to bracket 31! projecting inwardly from the
shell, whereby said weights have movement in a
lower edge of the depending bracket member 21.
vertical direction which is twice the distance
It will be observed that whereas sheave 30 de
travelled by the expansion roof.
pends downwardly, the sheave 34 extends upward
3. In a storage container for gas or liquid, an
ly. The cable 38 therefore passes over sheave 30 60 open top tank arranged to provide a body of'sealé
and under s'heave’3'4. One end of the cable is
ing liquid, an expansion roof movable with re
?xed to the tank, more particularly at the upper
edge of the launder, by means of a suitable con
spect thereto to vary the vapor space within the
tank, said roof having a depending peripheral
skirt’ located within the sealing liquid, so as to
a'bracket 40 secured to the angle [6 and a clevis
con?ne the gaseous medium within the tank, a
4| for joining the end of the cable to said bracket
rain shed skirt depending from the periphery
in a pivotal manner. The opposite end of the
of the roof and encircling the tank adjacent the
cable is suitably ?xed to the counterweight 4:2
upper portion, a plurality of upper sheaves sup
by means of the eye bolt 43.
ported in spaced relation around the upper edge
During operation of the counter-balancing ap 70 of the tank, brackets depending from the lower
paratus of the invention the counterweights 42
edge of the rain shed skirt in spaced relation sub
will move‘ vertically and since said weights are
stantially corresponding to that of said sheaves, a
suspended from sheaves 30 relatively close to the
lower sheave secured to each bracket, cables an
cylindrical wall H] of the tank, roller means are
chored at one end to the upper edge of the tank,
provided to maintain each weight in proper 75 and each extending downwardly to pass under‘
nection.
Said connection may ‘take the form of
2,411,262
a lower sheave and then upwardly to pass over
an upper sheave and depend therefrom, and a
counterweight secured to said opposite depend
ing end of each cable.
4. In a storage container for gas or liquid, an
open top tank arranged to provide a body of seal
ing liquid, an expansion roof movable with re
spect thereto to vary the vapor space within the
tank, said roof having a depending peripheral
6
/
from the upper edge of the tank, and upper and
lower sheaves arranged in pairs around the tank,
the upper sheave of each pair being secured to
the tank and the lower sheave being secured to
a bracket depending from the rain shed skirt,
and each said cable means intermediate its ends
passing under the lower sheave of the pair as
sociated therewith and over the upper sheave of
said pair, whereby said weights have movement
skirt located within the sealing liquid so as to 10 in a vertical direction which is twice the distance
con?ne the gaseous medium within the tank,
travelled by the expansion roof.
a rain shed skirt depending from the periphery
6. In a tank having an expansion roof with
of the roof and encircling the tank adjacent the
sealing means between the roof and the tank
upper portion, and counter-balancing means for
shell, a rain shed skirt depending from the pe
the roof including a plurality of weights located 15 riphery of the roof to form a weather hood, up
in spaced relation around the exterior of the
per, sheaves pivotally suspended from the upper
tank, cable means for suspending each weight
edge of the tank shell in spaced relation, lower
from the upper edge of the tank, and sheaves se
sheaves pivotally secured to the lower edge of
cured in spaced relation around the upper edge
the rain shed skirt and correspondingly spaced
of the tank and around the lower edge of the rain
so that the sheaves form substantially vertically
shed skirt respectively, each said cable means
aligned pairs, a cable for each pair, each cable
passing undera sheave secured to the skirt and
having one end ?xed to the tank shell and de
passing over a sheave secured to the tank, where
pending downwardly to pass under a lower sheave
by said weights have movement in a'vertical di
and upwardly to pass over an upper sheave and
rection which is twice the distance travelled by
25 depend therefrom, and a counterweight secured
the expansion roof.
to the depending end of each cable.
5. In a storage container for gas or liquid, an
7. In a tank having a stationary shell member
open top tank arranged to provide a body of seal
and a vertically movable roof member, pairs of
ing liquid, an expansion roof movable with re
superposed sheaves on said members, the sheaves
spect thereto to vary the vapor space within the
30 on said shell member being located above the
tank, said roof having a depending peripheral
sheaves on said roof member, and elongated,
skirt located within the sealing liquid so as to
?exible means extending over the upper sheave
con?ne the gaseous medium within the tank, a
of-each pair and under the lower sheave of each
rain shed skirt depending from the periphery
pair, and having one end secured to said shell
of the roof and encircling the tank adjacent the
35 member, and a counterweight for said roof mem
upper portion, and counter-balancing means for
ber secured to the other end of each of said elon
said roof including a plurality of weights located
gated, ?exible means.
in spaced relation around the exterior of the
tank, cable means for suspending each weight
PHILIP S. GRAVER.
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