IMPROVEMENTS IN STEAM GENERATORS OF THE CYLINDRICAL 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 CYLINDRICAL MULTITUBULAR TYPE to be as follows:-
Our Invention relates to the cylindrical multitubular type of steam generators
for marine purposes and which are tired at one, or both ends in horizontal
furnaces, or flues from whence the products of combustion pass to a combustion
chamber, or chambers and pass through a nest or nests of tubes into an uptake, or
uptakes.
Our Invention has for its object to construct the above type of steam generators
in such a manner as to dispense with the necessity of staying, what may be termed
the barrel shell of the combustion chamber, or chambers to the outer shell of the
generator and at the same time to form a strong construction of combustion
chambers.
A steam generator according to our Invention consists in constructing the barrel
of the combustion chamber, or chambers of such steam generator of the type above
specified of cylindrical form and in means of arranging and connecting the furnaces
or flues with the cylindrical combustion chamber, or chambers, and our Invention
also further consists in forming the barrel of combustion chambers of a single
plate, welded, and corrugated circumferentially. Thus a combustion chamber
constructed wholly according to our Invention, namely with all our Improvements
applied thereto, consists of a cylindrical shell formed of a single plate, welded
and circumferentially corrugated, the ends being of any of the usual, or known
forms.
An example of a steam generator of the cylindrical return multitubular type
fired at both ends and in four furnaces, constructed according to our Invention and
with our Improvements applied thereto, consists as follows.
The furnaces, or flues are arranged in the ordinary way at the lower portion of
the shell of the generator. The furnaces, or flues meet and are connected to the
combustion chambers in such a manner that the upper portions of the furnaces, or
flues meet and communicate with the lower portions of the combustion chambers,
thus entailing a partial dead ond in such furnace (namely at the lower part). This
partial dead end is stayed preferably by rods to the end of the furnace opposite, but
it may be stayed in any other desirable way. The return tubes lead from the upper
portions of the combustion chambers in the usual manner. As examples of the
forms of connections according to our Invention of a furnace to a combustion
chamber. According to one method, the tube plate of the combustion chamber is
flanged inwards, a portion of the plate being cut away to form the opening between
the furnace and the combustion chamber. The upper portion of the edge of the
furnace is flanged upwards and is thereby connected to the combustion chamber
tube plate. The lower portion of the edge of the furnace is flanged inwards and to
this flange is secured a plate which forms the dead end and which is attached to

page_text: the lower flange of the furnace and it is attached to the outside of the bottom of
the combustion chamber by an outward turned flange.
A modification of the above described forms of connections consists in flanging
the combustion chamber barrel outwards and attaching to it a plain tube plate
provided with a flange on the lower edge to fit over and to be attached to the upper
part of the edge of the furnace, where the furnace and combustion chamber meet.
The end plate forming the partial dead end is attached at its lower part to the
inside of the furnace edge by an inward flange and to the outside of the flange of
the combustion chamber barrel at its upper part. The edge of the furnace in this
case is not flanged but is a continuation of the furnace.
A further modification consists in flanging the tube plate inwards at the upper
portion and outwards at its lower portion where it is attached to the furnace edge.
The inward flange of the tubo plate is attached to the inside of the combustion
chamber barrel. The plate forming the partial dead end to the furnace is flanged
inward towards the furnace at its lower edge and fastened by it to the furnace and
it is flanged inwards towards the combustion chamber at its upper edge, by which
it is attached to the inside of the combustion chamber barrel. In this case also the
edge of the furnace is not flanged but is a continuation of the furnace. But the
connection between the furnace and the combustion chamber may be made by any
modification or combination of the methods before described.
A second method of connecting the furnace to the combustion chamber consists
in forming the tube plate of the combustion chamber and the plate forming the
partial dead end of the furnace, of a single flat plate and attaching the combustion
chamber and furnace to the plate by outward flanges formed on them. An aperture
is formed in the combined tube and furnace end plate to make a passage from the
furnace to the combustion chamber.
In some cases when the level of the furnace does not lie below the level of tho
bottom of the combustion chamber the furnace end may be attached to the tube
plate in the ordinary way.
By virtue of the above described figure of construction we obtain a strong
construction of combustion chamber and by the use of its form we are enabled to
dispense with the necessity of staying the barrel shell plate of the combustion
chamber, or chambers to the sholl of the generator.
The beforegoing sets forth the form of combustion chambers constructed
according to our Invention. This form is particularly applicable to generators
fired at both ends, but it is equally applicable to steam generators fired at one end
only, but in the case of multitubular generators fired at one end only 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 generator in the ordinary manner.
[
Although we have described our Invention as providing for the dispensing 'with
the necessity of staying the barrel shell plates of the combustion chamber, or
chambers to the shell plates of steam generators, 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, or support the barrel shells of the
combustion chamber, or chambers to the shell of the generator, or in cases where
two, or more combustion chambers are employed they may be stayed together, or
to the shell, or both. In every case such stays serving as a means of supporting
the combustion chambers and holding them in position.
1004

page_text: 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
CYLINDRICAL MULTITUBAR TYPE, and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:
Our Invention relates to the cylindrical multitubular type of steam generators
for marine purposes and which are fired at one, or both ends in horizontal furnaces,
or flues from whence the products of combustion pass to a combustion chamber or
chambers and pass through a nest, or nests of tubes into an uptake, or uptakes.
Our Invention has for its object to construct the above type of steam generators
in such a manner as to dispense with the necessity of dog or girder stays and
of staying what may be termed the barrel shell of the combustion chamber, or
chambers to the outer shell of the generator and at the same time form a strong
construction of combustion chambers.
A steam generator according to our Invention, consists in constructing the barrel
of the combustion chamber, or chambers of such steam generator of the type above
specified, of cylindrical form and in means of arranging and connecting the furnaces,
or flues with the cylindrical combustion chamber or chambers, and our Invention
also further consists in forming the barrel of combustion chambers of a single plate,
corrugated circumferentially. Thus a combustion chamber constructed wholly
according to our Invention, namely with all our Improvements applied thereto,
consists of a cylindrical shell formed of a single plate, circumferentially corrugated,
the ends being of any of the usual, or known forms.
-
An example of a steam generator of the cylindrical return multitubular type
fired at both ends and in four furnaces constructed according to our Invention and
with our Improvements applied thereto, consists as follows.
The furnaces, or flues are arranged in the ordinary way at the lower portion of
the shell of the generator. The furnaces, or flues meet and are connected to tho
combustion chambers in such a manner that the upper portions of the furnaces or
flues meet and communicate with the lower portions of the combustion chambers,
thus entailing a partial dead end in such furnace (namely at the lower part). This
partial dead end is stayed preferably by rods to the end of the furnace opposito,
but it may be stayed in any other desirable way or in the caso of a single ended
boiler to the back of the boiler. The return tubes lead from the upper portions of
the combustion chambers in the usual manner.-As examples of the forms of
connections according to our Invention of a furnace to a combustion chamber.
According to one method, the tube plate of the combustion chamber is flanged
inwards, a portion of the plate being cut away to form the opening between the
furnace and the combustion chamber. The upper portion of the edge of the furnace
is flanged upwards and is thereby connected to the combustion chamber tube plate.
The lower portion of the edge of the furnace is flanged inwards and to this flange is.
secured a plate which forms the dead end and which is attached to the lower flange,

page_text: of the furnace and it is attached to the outside of the bottom of the combustion
chamber by an outward turned flange.
A modification of the above described forms of connections consists in flanging
the combustion chamber barrel outwards and attaching to it a plain tube plate
provided with a flange on the lower edge to fit over and to be attached to the
upper part of the edge of the furnace where the furnace and combustion chamber
ineet. The end plate forming the partial dead end is attached at its lower part to
the inside of the furnace edge by an inward flange and to the outside of the flange
of the combustion chamber barrel at its upper part. The edge of the furnace in
this case is not flanged, but is a continuation of the furnace.
A further modification consists in flanging the tube plato inwards at the upper
portion and outwards at its lower portion where it is attached to the furnace edge.
The inward flange of the tube plate is attached to the inside of the combustion
chamber barrel. The plate forming the partial dead end of the furnace is flanged
inward towards the furnace at its lower edge and fastened by it to the furnace and
it is flanged inwards towards the combustion chamber at its upper edge, by which
it is attached to the inside of the combustion chamber barrel. In this case also the
edge of the furnace is not flanged, but is a continuation of the furnace. But the
connection between the furnace and the combustion chamber may be made by any
modification or combination of the methods before described.
A second method of connecting the furnace to the combustion chamber consists
in forming the tube plate of the combustion chamber and the plate forming the
partial dead end of the furnace, of a single flat plate and attaching the combustion
chamber and furnace to the plate by outward flanges formed on them. An aper-
ture is formed in the combined tube and furnace end plate to make a passage from
the furnace to the combustion chamber.
In some cases where the level of the furnace does not lie below the level of the
bottom of the combustion chamber the furnace end may be attached to the tube
plate in the ordinary way.
By virtue of the above described figure of construction, we obtain a strong con-
struction of combustion chain ber and by the use of its form we are enabled to
dispense with the necessity of dog or girder stays and of staying the barrel shell
plate of the combustion chamber, or chambers to the shell of the generator.
The above 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 Specifica-
tion. 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 with our
improvements applied thereto.
Figure 2 shows a corrugated combustion chamber according to our Invention
applied to a double ended boiler.
Figure 2 shows a corrugated combustion chamber according to our Invention
applied to a single ended boiler. .
Figure 3 is partly an end view of Figure 1 and partly a cross section through
X X Figure 2.
Figures 4. 5. 6 and 7 illustrato the different modes of connecting the combustion
chamber to the flue, or furnace.
Upon reference to the Drawings it will be seen that A is a double ended
cylindrical multitubular boiler in which B are the furnaces and C is one of the
combustion chambers, which is constructed of cylindrical form and is preferably
corrugated circumferentially as shown at Figure 2. By this form wo are enabled
to dispense with the necessity of staying the barrel shell d, which in the usual
construction is necessary in high pressure boilers, of the type herein set forth and
at the same time we obtain a strong construction of combustion chamber. The
shell d is of strong-construction by being formed of a single plate,

page_text: It will be seen that the furnaces B are arranged in the ordinary way at the lower
portion of the shell of the generator A. The furnaces, or flues meet and are connected to
the combustion chambers in such a manner that the upper portions of the furnaces, or
flues B meet and communicate with the lower portions of the combustion chambers C,
thus entailing a partial dead end b in such furnace (namely at the lower part).
This partial dead end b is stayed preferably by rods b₁ to the end of the furnace
opposite, or to the back of the boiler in single ended boilers but it may be stayed
in any other desirable way. The return tubes lead from the upper portions of the
combustion chambers in the usual manner. As examples of the forms of connec-
tions according to our Invention of a furnace to a combustion chamber. According
to one method (see Figure 4) the tube plate e of the combustion chamber is flanged
inwards at e¹, a portion of the plate being cut away to form the opening between
the furnace and the combustion chamber. The upper portion of the edge 6³ of the
furnace is flanged upwards and is thereby connected to the combustion chamber
tube plate e. The lower portion of the edge b³ of the furnace is flanged inwards
and to this flange is secured a plate which forms the dead end b, and which is
attached to the lower flange b³ of the furnace and it is attached to the outside of
the bottom of the combustion chamber by an outward turned flange bª.
A modification of the above described forms of connections see Figure 5 consists
in flanging the combustion chamber barrel & outwards at e² and attaching to it a
plain tube plate e provided with a flange e³ on the lower edge to fit over and to be
attached to the upper part of the edge of the furnace where the furnace and com-
bustion chamber meet. The end plate formning the partial dead end b is attached
at its lower part to the inside of the furnace edge by an inward flange b³ and to
the outside of the flange e² of the combustion chamber barrel & at its upper part.
The edge of the furnace B in this case is not flanged, but is a continuation of the
furnace.
A further modification (see Figure 6) consists in flanging the tube plate e inwards
at the upper portion at e¹ and outwards at e³ at its lower portion where it is
attached to the furnace edge. The inward flange e¹ of the tube plate & is attached
to the inside of the combustion chamber barrel d. The plate forming the partial
dead end b to the furnace B is flanged inward towards the furnace at 65 at its lower
edge and fastened by it to the furnace and it is flanged inwards at b' towards the
combustion chamber at its upper edge, by which it is attached to the inside of the
combustion chamber barrel. In this case also the edge of the furnace B is not
flanged, but is a continuation of the furnace. But the connection between tho
furnace and the combustion chamber may be made by any modification, or combi-
nation of the methods before described.
A second method (see Figure 2) of connecting the furnace to the combustion
chamber consists in forming the tube plate e of the combustion chamber C and the
plate forming the partial dead end b of the furnace, of a single flat plato and
attaching the combustion chamber and furnace to the plate by outward flanges e¹
and be formed thereon. An aperture is formed in the combined tube and furnace
end plate to make a passage from the furnace to the combustion chamber.
The beforegoing sets forth the form of combustion chambers constructed accord-
ing to our Invention. This form is particularly applicable to generators fired at
both ends, but it is equally applicable to steam generators fired at one end only,
but in the case of multitubular generators fired at one end only, 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 generator in the ordinary manner, as shown at
Figure 24
Although we have described our Invention as providing for the dispensing with
the necessity of staying the barrel shell plates of the combustion chamber, or
chambers to the shell plates of the steam generators, 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 construc-
tions of steam generators, we may partially stay, or support the barrel shells of the

page_text: combustion chamber, or chambers to the shell of the generator, or in cases where
two, or more combustion chambers are employed, they may be stayed together, or
to the shell, or both. In every case such stays serving as a means of supporting
the combustion chambers and holding them in position.
-
· Having now particularly described 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 cylindrical multitubular type, constructing the
combustion chambers thereof of cylindrical form as and for the purposes set forth.
Second In steam generators of the cylindrical multitubular type constructing
the combustion chambers thereof of cylindrical form the shell of such chambers
being formed of ono plate as and for the purposes set forth.
Third In steam generators of the cylindrical multitubular type constructing the
combustion chambers thereof of cylindrical form the shell of such chambers being
formed of one plate and corrugated circumferentially as and for the purposes set
forth.
Fourth The connection of the flues B with combustion chambers C as set forth
with reference to Figure 4 of the Drawings.
Fifth The connection of the flues B with combustion, chambers C as set forth
with reference to Figure 5 of the Drawings.
Sixth The connection of the Blues B with combustion chambers C as set forth
with reference to Figure 6 of the Drawings.
Seventh The connection of the flues B with combustion chambers C as set forth
with reference to Figure 7 of the Drawings.