IMPROVEMENTS IN STEAM GENERATORS OF THE MULTITUBULAR TYPE
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
We, WILLIAM RAE M'KAIG, and JAMES CARLTON STITT, both of 17 Water
Street, Liverpool in the County of Lancaster, Marine Consulting Engineers do
hereby declare the nature of our said Invention for IMPROVEMENTS IN STEAM
GENERATORS OF THE MULTITUBULAR TYPE to be as follows:―
The object of our Invention is to construct steam generators of the multitubular
type in such a manner as to dispense wholly, or partially with the necessity of
staying what may be termed the barrel shell plates, namely the plate, or plates
constituting the crown, sides and bottom of the combustion chamber, or chambers
to the outer shell of the generator, and our Invention consists in forming the barrel
shell of the combustion chamber, or chambers of the steam generator of a corru-
gated plate, or plates, the corrugation running circumferentially around the
combustion chamber, or chambers and our Invention further consists of certain
novel forms of combustion chamber and of the combination of the parts of our
Invention, thus obtaining a great strength of construction of and thereby wholly
or partially dispensing with the necessity of staying the barrel shell plate, or plates
of the combustion chainber, or chambers.
Such
Combustion chambers of steam generators according to our Invention are
constructed with the barrel shell plates circumferentially corrugated.
circumferentially corrugated combustion chambers may take any of the various
known forms or the forins hereinafter described. One novel shape of combustion
chamber consists in forming it of a partial cylinder and one flat side. Such a form
is particularly suitable for a double furnace generator, the flat sides being adjacent
to one another. Another form of combustion chamber consists of the upper
portion of the chamber being formed of a partial cylinder, somewhat or considerably
more than a semi cylinder and one side, namely the outer side forming a segment
of a cylinder, this side being substantially concentric with the shell of the
generator, the bottom being a partial cylinder and the remaining side straight.
Such a form is particularly suitable for a double furnace generator, the flat sides
being adjacent to one another.
Combustion chambers constructed according to our Invention are particularly
applicable to generators with return tubes and fired at both ends, but they are
equally applicable to other sorts of steam generators fired at either one end, or at
both ends, or otherwise, but in the case of multitubular generators fired at one end

page_text: only and also equivalent types, it will be evident that the vertical, or inclined end
surfaces, namely the end plate, or plates will be stayed to the back of the steain
generator in the ordinary manner.
Although we have described our Invention as providing for the dispensing
wholly or partially with the necessity of staying the barrel shell, or shells of the
combustion chamber, or chambers of steam generators to their shells, it must be
understood that such staying as by our Invention may be dispensed with is the
staying which is for the purpose of obtaining strength to resist pressure. But in
certain constructions of steam generators, we may partially stay the barrel shell of
the combustion chamber to the shell, or in cases where two, or more combustion
chambers are employed, they may be stayed together, or to the shell, or both. In
these cases such stays serving as a means of supporting the combustion chambers
and holding them in position.

page_text: COMPLETE SPECIFICATION.
We WILLIAM RAE MCKAIG and JAMES CARLTON STITT, both of 17 Water
Street, Liverpool, in the County of Lancaster, Consulting Engineers do hereby
declare the nature of our said Invention for IMPROVEMENTS IN STEAM GENERATORS
of the Multitubular Type and in what manner the same is to be performed,
to be particularly described and ascertained in and by the following statement:-
The object of our Invention is to construct steam generators of the multitubular
type in such a manner as to dispenso wholly, or partially with the necessity of
staying what may be termed the barrel shell plates, namely the plate, or plates
constituting the crown, sides and bottom of the combustion chamber, or chambers
to the outer shell of the generator, and our Invention consists in forming the barrel
shell of the combustion chamber, or chambers of the steam generator of a corru-
gated plate, or plates, the corrugations running circumferentially around the
combustion chamber, or chambers, and our Invention further consists of certain
novel forms of combustion chamber and of the combination of the parts of our
Invention, thus obtaining a great strength of construction of and thereby wholly,
or partially dispensing with the necessity of staying the barrel shell plate, or plates
of the combustion chamber, or chambers.
Such
Combustion chambers of steam generators according to our Invention are
constructed with the barrel shell plates circumferentially corrugated.
circumferentially corrugated combustion chambers may take any of the various
known forms, or the forms hereinafter described. One novel shape of combustion
chamber consists in forming it of a partial cylinder and one flat side. Such a form
is particularly suitable for a double furnace generator, the flat sides being adjacent
to one another. Another form of combustion chamber consists of the upper
portion of the chamber being formed of a partial cylinder, somewhat, or considerably
more than a semi cylinder and one side namely the outer side forming a segment
of a cylinder, this side being substantially concentric with the shell of the
generator, the bottom being a partial cylinder and the remaining side straight.
Such a form is particularly suitable for a double furnace generator the flat sides
being adjacent to one another.
The beforegoing being a general description of the nature, object and purposes
of our Invention, we will now proceed to set forth the same more clearly by the
aid of the two sheets of Drawings hereto annexed and which form part of this
Specification. The Drawings are marked with figures and letters of reference, like
letters and figures being used to denote like, or corresponding parts throughout
the various views.
Figure 1 is a sectional elevation of a boiler of the type herein set forth according
to our Invention fired at both ends.
Figure 2 is a section through X X Figure 1.
Figure 8 is a sectional elevation of a boiler of similar type to that shown at
Figure 1, but fired at one end only.
Upon reference to the Drawings it will be seen that the boiler A is provided
with combustion chambers C, the barrel shell plate d of each of which is corrugated

page_text: circumferentially. Such circumferentially corrugated combustion chambers may
take any of the various known forms, or the forms herein set forth. One such
novel shape of combustion chamber C (see Figures 1. 2 and 3) consists in forming
it of a partial cylinder and one Bat side e. Such a form is particularly suitable
for a double furnace generator the flat sides being adjacent to one another, and
stayed together.
Another form of combustion chamber C (see Figures 4, 5 and 6) consists of the
upper portion of the chamber C being formed of a partial cylinder, somewhat
more than a semi cylinder and one side g namely the outer side forming a segment
of a cylinder, this side being substantially concentric with the shell of the generator,
the bottom h being a partial cylinder and the remaining side e straight. Such a
form is particularly suitable for a double furnace generator, the flat sides being
adjacent to one another and stayed together.
Combustion chambers constructed according to our Invention are particularly
applicable to generators with return tubes, and fired at both ends, but they are
equally applicable to other sorts of steam generators fired at either one end, or at
both ends, or otherwise, but in the case. of multitubular generators fired at one end
only and also equivalent types, it will be evident that the vertical, or inclined end
surfaces, namely the end plate, or plates will be stayed to the back of the steam
generator in the ordinary manner.
Although we have described our Invention as providing for the dispensing
wholly, or partially with the necessity of staying the barrel shell, or shells of the
combustion chamber, or chambers of steam generators to their shells, it must be
understood that such staying as by our Invention may be dispensed with is the
staying which is for the purpose of obtaining strength to resist pressure. But in
certain constructions of steam generators, we may partially stay the barrel shell of
the combustion chamber to the shell, or in cases where two, or more combustion
chambers are employed, they may be stayed together, or to the shell, or both. In
these cases such stays serving as a means of supporting the combustion chambers
and holding them in position.
Having now particularly described and ascertained the nature of our said
Invention and in what manner the same is to be performed we declare that what
we claim is
First. In steam generators of the multitubular type constructing the combustion
chambers thereof with circumferential corrugations as and for the purposes set
forth.
Second. In steam generators of the multitubular type constructing the combustion
chambers thereof of the form as set forth with reference to Figures 1 2 and 3 of
the Drawings for the purposes described.
Third. In steam generators of the multitubular type constructing the combustion
chambers thereof of the form as set forth with reference to Figures 45 and 6 of
the Drawings for the purposes described.