Improvements in or connected with Flues and Fire-boxes for Steam Boilers.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in or connected with Flues and Fire-boxes for Steam
Boilers.
I, JOHN IRELAND BOOKER, of Tong Road, Leeds, in the County of York,
Engineer, do hereby declare the nature of this invention to be as follows:-
The object of this invention, is to construct flues and fire-boxes for steam
boilers, in such a manner that they are interchangeable and may be readily re-
moved for repairs; whilst at the same time their strength is greater in proportion
to their weight than flues hitherto manufactured for the same purpose.
In attempts which have hitherto been made to corrugate conical flues, the cor-
rugations have been made of equal size throughout the entire length of the flue,
thus causing the small amount of metal at the smaller end of the flue to be
drawn to a greater extent than the metal at the larger end; and as this inequality
is experienced in different degrees at various points throughout the entire length
of the flue, it is unduly strained and unevenly rolled throughout its length, thus
preventing the efficient manufacture of conical corrugated flues.
According to my invention, I form the flues in a slightly conical form tapering
graduallly from one end of same to the other, and the said flues are formed with
circular corrugations, the sizes of which are gradually reduced from the larger end
of the flue to the smaller end of same, in the same proportion as the flue itself
diminishes in size. In other words the outside and inside surfaces of the
corrugations are contained between two series of lines which form the surfaces of
two concentric cones having one common apex.
In boilers of the Lancashire type, where several sections must be joined together
for the purpose of constructing a long flue, the smaller end of the flue may be
terminated with the outside portion of a corrugation; or continuation of same,
and the larger end with the inside portion of a corrugation or continuation of
same, and these inside and outside portions are of such a size that they fit one
within the other without the necessity of forming additional flanges. Flanges
may however be formed if required, and these are of such a size that they are free
to pass through the boiler front without the necessity of removing same, and
making the sections easily removable and interchangeable. The flues above
described are also suitable for marine boilers, and as the flange on the flue for
attachment to the combustion chamber is situated on the small end of the flue,
the latter can be removed through the aperture in the boiler front if required.
Dated this 18th day of June 1897

page_text: Improvements in or connected with Flues and Fire-boxes for Steam
Boilers.
I, JOHN IRELAND BOOKER, of Tong Road, Leeds, in the County of York,
Engineer, 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 object of this invention, is to construct flues and fire-boxes for steam boilers,
in such a manner that they are interchangeable and may be readily removed for
repairs; whilst at the same time their strength is greater in proportion to their
weight than flues hitherto manufactured for the same purpose.
In attempts which have hitherto been made to corrugate conical flues, the
corrugations have been made of equal size throughout the entire length of the flue,
thus causing the small amount of metal at the smaller end of the flue,
to be drawn to a greater extent than the metal at the larger end; and as this
inequality is experienced in different degrees at various points throughout the
entire length of the flue, the said flue is unduly strained and unevenly, 'led
throughout its length, thus preventing the efficient manufacture of a
corrugated flues.
In order that my invention may be clearly understood, I will proceed -
describe same with reference to the accompanying drawings, in which similar
letters refer to like parts in all the figures.
Figure 1 shews a flue constructed according to my invention, and Figures 2,
3, 4, 5, 6, 7 and 8 illustrate its application to various classes of boilers.
According to my invention, and with special reference to Figure 1, A is the
flue which is formed in a slightly conical form tapering gradually from the
larger end B to the smaller end (, and the flue A is formed with corruga-
tions D, the size of which are gradually reduced from the large end B to the small
end C, in or about the same proportion as the flue A itself diminishes in size.
In other words,the outside and inside surfaces of the corrugations D), are contained
between two series of lines E, E and F, F, which form the surface of two con-
centric cones having one common apex G. It will be seen that the corrugations D
diminish in width as well as in depth, in fact each corrugation diminishes in scale
as it is further removed from the larger end 13 of the flue A.
The result of the gradual alteration in the sizes of the corrugations is, that
corrugations are formed of suitable size to suit the size of the portion of the flue
on which they are made, thus preventing the uneven strain to which the flue would
be subjected were the corrugations of similar size throughout the entire length
of the flue.
Figure 2 illustrates my invention as applied to marine boilers, the ends B
and C being made plain, and being received in flanged recesses situated on the
boiler front and on the combustion chamber. Figure 3 illustrates a similar flue
to that shewn in Figure 2, except that the ends of the flue are formed with
flanges K for attaching to the front plate L and back plate M of the boiler, and the
flange K on the end of the flue A is of such a size that it is free to pass through
the aperture N in the boiler front, should it be required to remove the said flue
for repairs.
In Figures 4 and 5 I have illustrated my invention as applied to a boiler of the
Lancashire type, where several flues A must be joined together for the purpose
of constructing a long flue. In Figure the smaller end (is terminated with the
outside portion of a corrugation or continuation of same H, and the larger end B

page_text: with the inside portion of a corrugation or continuation of same J, and these por-
tions Hand J are of such a size that they fit one within the other without the necessity
of forming additional flanges. Flanges K may however be formed if required,
as seen at Figure 5, where the end flanges are fastened to the front plate L
and to the back plate M of the boiler, and the flanges K are of such a size that
they are free to pass through the aperture N in the boiler front.
Figure 6 shews one of my conical corrugated flues A applied as a fire-box for a
vertical boiler.
Figures 7 and 8 illustrate my invention as applied to a winged or centre flue
for use in boilers of the marine type, the latter figure shewing the flue sufficiently
extended so as to enable it to form the base of the combustion chamber. P is
a flange which extends for a certain distance round the end of the flue, and whose
size is sufficiently small to permit of its withdrawal through the aperture in the
boiler front, should it be required to remove the flue.
In all the arrangements above described, the Hanges formed on the smaller end
of the flue do not hinder its removal through the face of the boiler, and this is
a great advantage as it enables the flues to be interchangeable and obviates the
necessity of removing the boiler face each time it is required to renew a flue.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:-
1. A conical corrugated flue or tube, having corrugations at the larger end
of larger size than the corrugations at the smaller end, substantially as and for the
purposes set forth.
2. A conical corrugated flue or tube, having its corrugations reducing in
regular proportion, from the large end of the tube to the small end of same,
substantially as and for the purposes set forth.
3. A conical corrugated flue or tube, having its corrugations of a size varying
according to the taper of the flue or tube, substantially as and for the purposes set
forth.
Dotal 11:
1
PTI 1007