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Патент USA US2403670

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July 9, 1946.
w. H; MARTlN
coRnosxomRmsxsmm FLUID HEATING‘ ‘TANK
Filed May 30, 1944
Patented July 9, 1946
2,403,67 0
William H. Martin, Lakewood, Ohio, assignor, by
mesne assignments, to Republic Industries, Inc.,
New York, N. Y., a corporation of Delaware
Application May 30, 1944, Serial No. 538,000
1 Claim. (Cl. 219--38)
This invention relates as indicated to corro
The most common form to which the invention
is applied is the conventional cylindrical hot wa
ter heating and storage tank sold for domestic
use, comprising a cylinder of approximately 1 to
3 feet in diameter, and of various lengths de
sion-resistant fluid heating tanks and‘ more es
pecially to tanks such as are used for the pur
pose of heating and storing hot water as in do
mestic and commercial establishments.
There has been considerable attention direct
pending upon their capacity. The tank body is
ed to the problem of providing corrosion-resist
in its entirety provided with a coating 2 on the
ant linings for tanks of this character. One type
inner surface thereof of a corrosion-resistant
of corrosion-resistant lining available is porce
material such as porcelain enamel.
lain enamel. This material is of such a nature, 10
The present invention is concerned primarily
however, that when there is a local failure in
with the provision of means whereby an immer
any portion of the tank, such failure may not be
sion heater may be removably attached to the
readily repaired necessitating scrapping the en
body of the tank with the heating unit thereof
tire structure.
extending into the tank space, the entire as
A particular problem is presented in the manu 15 sembly characterized in that there are no parts
facture of tanks of this character when the same
exposed to the tank contents which are subject
are to be provided with an immersion-type elec
to corrosion. These ends are accomplished by
tric h'eater which requires that the tank body be
providing an opening in a local area in the tank
provided with some means whereby such immer
wall with the wall around such opening prefer
sion heating unit may be removably secured to 20 bly ?ared outwardly for a slight extent as indi~
the tank body by means which Will not leave ex
cated at 3. A tubular member 4 having an an
posed any surface which will be corroded by the
nular skirt 5 is arranged concentrically with the
contents of the tank, while, at the same time,
opening in the tank wall and with such skirt in
providing a structure which can be readily as
close ?tting engagement with the struck~out
sembled and disassembled without damage to the -. portions 3 of the tank wall. The parts described
corrosion-resistant coating on the interior of the
are conveniently united by means of a ?llet weld
6 such as may be secured either by gas or electric
It is a principal object of my invention to pro
welding operations which are conventional and
vide a structure of the character described which
has all of these desirable advantages.
After the parts are thus assembled, the tank,
Other objects of the invention will appear as
or more particularly, the inner surface thereof is
the description proceeds.
provided with the enamel coating 2 and such
To the accomplishment of the foregoing and
coating extends over at least a portion of the
related ends, said invention then comprises the
axial extent of the inner periphery of the annu
features hereinafter fully described and particu 35 lus 4. In the preferred embodiment of the inven
larly pointed out in the claim, the following de
tion, the coating 2 extends over the major por
scription and the annexed drawing setting forth
tion of the inner periphery of the skirt 5.
in detail certain illustrative embodiments of the
After the enamel coating has been thus ap
invention, these being indicative, however, of but
a few of the various ways in which the principle
plied by conventional porcelain enamelling pro
cedure, then an insert 1 of corrosion-resisting
of the invention may be employed.
material is molded in the annular recess provid
In said annexed drawing:
ed by the enlarged inside diameter of the skirt
Fig. 1 is a fragmentary transverse sectional
portion 5 of the annulus 4. This molding opera
view of a portion of a tank of the character de~
tion may be accomplished by placing a die mem
scribed showing in detail the features thereof 45 ber in the annulus 4 and then introducing the
comprising my invention; and
molding material into the space adapted to re»
Fig. 2 is an end elevational view taken from the
ceive the same and, after the molding material
left side of Fig. 1, it being noted that Fig. 1 is_
has been permitted to solidify, the die which has
taken on a sectional plane substantially indicat
close ?tting engagement with the inner periph
50 ery of the outer portion of the annulus 4 is with
ed by the line l-l in Fig. 2.
Referring now more speci?cally to the draw
drawn, whereupon the outer portion of the an
ing and more especially to Fig. 1, the structure
nulus 4 and the axially adjacent portion of the
here illustrated comprises a tank body generally
molded insert 6 are provided with a continuous
indicated at l. The tank with which the inven
pipe thread.
tion is associated may be of any general form. 65
It will be observed that since the enamel coat
ing 2 extends into the space occupied by the in
sert 6, the latter will be in overlapping relation
areas as a result of the normal stresses encoun
tered either in use or incidental to assembly and
with such coating insuring that there are no
areas of the metallic wall I exposed to the con
tents of the tank.
After the parts are assembled and fabricated
in the manner described, I then provide a mem
her 8 which is generally annular in form and
which is threaded into the threads formed on the
inner periphery of the annulus 4 and molded in 10
sert 6. The annulus 8 is provided with a radially
disassembly of the described combination.
Other modes of applying the principle of the
invention may be employed, change being made
as regards the details described, provided the
features stated in the following claim or the
equivalent of such be employed.
extending ?ange 9 at its outer end. The member
able immersion-type heating element and char
I, therefore, particularly point out and distinctly
claim as my invention:
A fluid heating tank provided with a replace
acterized in that all inner surfaces of the assembly
with which the tank contents come into contact
faces to the contents of the tank which may be 15 are corrosion-resistant, comprising an extension
subject to corrosion thereby.
on the outer surface of the wall of said tank about
The immersion heater unit, diagrammatically
an opening therein, such extension providing a
illustrated as comprising four tubular heating
passage with its axis extending at an angle to the
8 is formed of a corrosion-resistant material such
as brass, copper, or the like, so as to offer no sur
units 10, is carried by a circular plate H likewise
formed of corrosion~resistant material such as
any of the metals previously mentioned. The
heater units I!) may be secured to the plate I I in
a variety of ways, none of which form any part
of the present invention, excepting that whatever
means are employed for that purpose, the mate
rials used should be corrosion-resistant to the
contents of the tank, at least those portions which
are arranged on the inner face of the plate I l.
plane of the adjacent tank wall, a corrosion
resistant coating on the inner surface of said wall
and extending outwardly over the inner surface
of said passage, an insert of corrosion-resistant
material molded in interlocking relation in said
passage in overlying relation with said corrosion
25 resistant coating, a thread formed on said molded
insert and the axially outer portion of said exten
sion, an annular, exteriorly threaded member of
corrosion-resistant material threaded into said
The plate II is removably united to the
passage and provided exteriorly of the tank with
?ange 9 of the annulus B by means of a plurality 30 a radially extending ?ange having engagement
of spaced studs l2.
with the outer end of said extension, an immer
From the foregoing description, it will be ob—
served that I have provided a structure in which
all of the surfaces exposed to the tank contents
are corrosion-resistant.
A further and more ;
particular advantage of my improved construc
tion is that the supporting means for the im
mersion unit is of such strength and rigidity and
so united to the relatively thin tank wall as not
to result in a flexure of the tank wall in local 40
sion-type heating unit comprising a cover plate of
corrosion-resistant material removably secured
over the outer end of said passage by attachment
to said flange, and a heating element
said plate and extending through said passage
into said tank.
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