Setting for Boilers and other Metallic Vessels subjected to Periodical Heating.
Year: 1896

page_text: Date of Application, 19th Aug., 1896-Accepted, 19th Aug., 1897
Setting for Boilers and other Metallic Vessels subjected to
Periodical Heating.
I, ERNEST CHRISTIAN WILHELM TOENGES, of Dusseldorf, in the Empire of Germany,
Manufacturer do hereby declare the nature of this invention and in what manner
the same is to be performed to be particularly described and ascertained in and by
the following statement :-
The settings hitherto in use for Boilers, Brewer's Coppers, and metallic vessels of
all kinds, have the disadvantage that a wearing, and finally a breaking away of the
masonry or brickwork, results as soon as the boiler or other vessel expands under
the effect of the heating. As the co-efficient of the heat expansion of tho metal
is far greater than that of the masonry or brickwork, the latter is subjected or
exposed to a pressure which is proportioned to the difference of the co-efficient of
expansion of the metal and that of the masonry or brickwork respectively. On
the other hand, the elasticity of the metal is other than that of the masonry or
brickwork, so that upon the cooling of the boiler or other vessel, the metal is more
strongly contracted than the masonry or brickwork, and in course of time the sent of
the boiler becomes loosened, which process is assisted by the wearing away of the
masonry.
The object of the present invention is to remove this disadvantage, and this is
effected in the following manner :-
Fig. 1 represents a cross section through the boiler.
Fig. 2 a vertical cross section to Fig. I through the boiler setting.
The principle of the invention consists in the fact that a buffer is placed between
the masonry and the boiler, of such a nature as to prevent the damage resulting from
the difference in the nature of the materials. On the boiler or other vessel is placed
a metal cover, composed of two cylindrical halves a and b, which, especially when
made of the same material as the boiler, undergoes any change of volume with the
latter.
This first metal cover a, b, is concentric with a second c, d, with which it is
relatively moveable. This latter is firmly closed by means of the soldered on pieces
or tongues e and set in the usual way in the brickwork.
If the space between the two covers be filled up with any elastic non-conductor of
heat, as for instance, silicious marl, the following action occurs. Should the boiler
expand in consequence of the heating, the cover a b is pushed radially against the
cover c, d under a simultaneous compression of the buffer material and corresponding
resistance of the masonry. The work which is produced by the counter-pressure of
the magonry on the silicious marl for instance, and the distance moved by the cover
b corresponds with the damaging effect of the heat which otherwise would cause a
wearing away of the setting.
If the boiler or cooking utensil should cool, the material of the buffer, thanks to its
elasticity, will regain its former volume and under separation of the two metal covers,
secure to the boiler or other vessel the same firmness of setting as before the heating
operation commenced.

page_text: The only condition for the proper working of the apparatus is the presence of a
sufficient quantity of such a substance as silicious marl for instance, in order that the
cover ab may have a sufficiency of space to act in, relatively to the cover cd,
the extreme limit of the clasticity of the filling material on the one side and the
co-efficient of expansion of the boiler sheet plates and the degree of heat on the other
Bide.
In order that the cover ab may exactly enclose the sides of the boiler and the
pressure be evenly distributed, the heads of the rivets under the cover are flush.
For the same purpose, a coneform piece of iron g is laid on before the lashing over of
the boiler buffer.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed, I declare that
what I claim is :-
A setting for boilers, and other metallic vessels subjected to periodical heating, in
which the pressure of the vessel, resulting from its expansion, is transferred to a buffer
placed between the vessel and the masonry or brickwork, this buffer being formed of
two covers composed of sheet metal, movable in relation to each other, and filled up
with some elastic substance.
Dated this 190
August 1896.
For the Applicant,
J. G. LORRAIN, M.I.E.E. &c.
Norfolk House, London, W.C., Chartered Patent Agent.