Improvements in Constructing Corrugated Furnace Shells or Flues of Steam Boilers.
Year: 1885

page_text: PROVISIONAL SPECIFICATION.
Improvements in Constructing Corrugated Furnace Shells or
Flues of Steam Boilers.
I, JOHN HAYTHORN, of Commercial Bank House, Dumbarton, in the County of
Dumbarton, North Britain, Engineer, do hereby declare the nature of my said
invention for "IMPROVEMENTS IN CONSTRUCTING CORRUGATED FURNACE SHELLS OR
FLUES OF STEAM BOILERS" to be as follows, that is to say :-
My said Invention has for its object to construct corrugated furnace shells or
flues for steam boilers in an improved and economical manner.
My Invention consists principally in constructing the furnace shells or flues of
segmental corrugated plates fixed to each other and to other' parts of the boilers by
means of flanges projecting outwards at right angles from the plates at their edges.
Very simple hydraulic machinery may be used for shaping the segmental plates by
pressure between suitable dies; and the furnace shells or flues can in this way be
constructed much more economically than when a single plate is made to extend
entirely round the furnace or flue and is corrugated or rolled in its complete
cylindrical form as heretofore commonly practised.
In carrying out my Invention two or more segmental plates may be used to
extend round the furnace or flue, I however prefer to use three segmental plates in
the circle, using one plate for the bottom, and with the two other plates joined
together along the middle of the top of the furnace or flue. In a marine boiler of
an ordinary type with furnaces at one end, each furnace shell may be formed by
three segmental plates of a length to extend from the front of the boiler to the
combustion chamber, and a short length like the bottom segment may be riveted
as a continuation to that segment and so as to extend under the combustion
chamber, its inner end and upper edges being riveted to the back and sides of the
chamber. Or a single bottom segmental plate may be made to extend from the
front of the boiler to the back of the combustion chamber. In a boiler with
furnaces at both ends and a combustion chamber in the middle I prefer to make
the bottom plates of each two furnaces which are in line and of the space between
them, of three plates of about equal length irrespective of the precise lengths
between the ends of the boiler and the combustion chamber.
Dated this tenth of T100
EDMUND HUNT,
Applicant's Agent.

page_text: Improvements in Constructing Corrugated Furnace Shells or
Flues of Steam Boilers.
I, JOHN HAYTHORN, of Commercial Bank House, Dumbarton, in the County of
Dumbarton, North Britain, 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, that is to say:
My said Invention has for its object to construct corrugated furnace shells or
flues for steam boilers in an improved and economical manner.
My Invention consists principally in constructing the furnace shells or flues of
segmental corrugated plates, fixed to each other and to other parts of the boiler by
means of flanges projecting outwards at right angles from the plates, at their edges.
Very simple hydraulic machinery may be used for shaping the segmental plates by
pressure between suitable dies; and the furnace shells or flues can in this way be
constructed much more economically than when a single plate is made to extend
entirely round the furnace or flue and is corrugated or rolled in its complete
cylindrical form as heretofore commonly practised.
And in order that my said Invention and the manner of performing the same
may be properly understood I hereunto append four sheets of explanatory drawings
to be hereinafter referred to and showing some of the modes in which furnace
shells and flues of steam boilers may be constructed according to my Invention.
In these drawings the same reference letters are used to mark the same or like
parts wherever they are repeated.
Figures, 1, and 2, on sheet, 1, of the accompanying drawings represent a simple
furnace shell, figure, 1, being, one half in end elevation and one half in transverse
vertical section, and figure, 2, being one half in longitudinal vertical section and
one half in side elevation. Two or more segmental plates may be used to extend
round the furnace or flue, I however prefer to use three segmental plates, A, B, C,
in the circle, using one plate, A, for the bottom, and with the two other plates, B, C,
joined together along the middle of the top of the furnace or flue. Caulking
strips are by preference inserted between the longitudinal edge flanges of the
segmental plates and the top one may be made deeper than the others, as indicated
by dotted lines in figure, 2, to impart additional strength to the crown.
Figures, 3, and 4, represent a marine boiler of ordinary type with a single
furnace, a combustion chamber, D, and return flue tubes, E. Figure, 3, is half end
elevation half transverse section and figure, 4, is a longitudinal vertical section.
Figures, 5, and 6, corresponding to parts of figures, 3, and 4, show a modification
in the mode of connecting the furnace shell to the combustion chamber, D.
Figures, 7, and 8, are similar views also of a marine boiler of ordinary type but
with two furnaces, two combustion chambers, D, and return tubes, E. In figures, 3,

page_text: and 4, the bottom furnace plate, A, is shown as continued to the back of the
combustion chamber, D; in figures, 5, and 6, the combustion chamber, D, is shown
with its bottom formed by a continuation of the plain plate forming the sides;
and in figures, 7, and S, the combustion chamber, D, is shown as formed with
a corrugated bottom plate, F, to the front flange of which the furnace bottom
plate, A, is riveted, a downward extension of the back tube plate being secured
between the flanges.
Figures, 9, and 10, on sheet, 2, of the drawings show a three-furnace double-
ended return tubular marine boiler, figure, 9, being a longitudinal vertical section,
and figure, 10, half end elevation and half transverse section. In the left hand
half of figure, 9, the bottom furnace plate, A, is shown as joined to the downward
extension of the back tube plate, which is prolonged, as shown at, G, to the
outer shell of the boiler to form a stay in cases in which the crown of the
combustion chamber is supported from the shell by sling stays. The right-hand
half of figure, 9, shows part of a modification in which three lengths of corrugated
plates, A, are made to extend from one end of the boiler to the other, and to
form the bottoms of the furnaces and of the combustion chamber, the joints of
the three lengths being independent of the positions of the back or inner tube
plates.
Figures, 11, and 12, represent a vertical boiler of ordinary type with an internal
furnace, the shell of which is made of segmental corrugated plates, H, according to
my Invention. Figure, 11, is half horizontal section and half plan, and figure, 12,
is half vertical section and half elevation. For a boiler of this kind I prefer to
make the furnace shell of four segmental plates, H. The furnace shell constructed
in this way is self-sustaining without requiring stays to the shell or cross water
tubes.
Figures, 13, and 14, on sheet, 3, of the drawings represent a marine boiler of
the haystack type, figure, 13, being one half horizontal section as at J-J in
figure, 14, one quarter plan, and one quarter horizontal section as at K-K in
figure, 14. The uptake flue, L, is made with segmental corrugated plates and
is self-sustaining. The annular furnace is constructed with a number of segmental
corrugated plates, M, and is made self-sustaining and at the same time to support
the outer boiler shell by plate stays, N, which are extensions of caulking pieces
riveted between the joint flanges of the segmental plates, M, and are attached to
the boiler shell by angle iron.
Figures, 15, and, 16, on sheet, 4, of the drawings are horizontal and vertical
sections of a vertical internal-furnace multitubular boiler, the shell of the furnace
being constructed with segmental corrugated plates, M. The left-hand halves of
the two figures show the furnace space as divided by a diametrical water space, P,
whilst the right-hand halves correspond to an annular form of furnace space with
a central water pocket, Q. The furnace shell, M, is connected to the outer boiler
shell by combined stay and caulking plates, N.
Figures, 17, and 18, represent a vertical "ironworks" boiler of the kind heated
by partly used gases passing up a vertical flue. . Figure, 17, is half horizontal
section half plan, and figure, 18, is a vertical section corresponding to half the
length of the boiler. The flue, R, is made up with several lengths of segmental
corrugated plates and the plates of the adjoining lengths are by preference arranged
so as to break joint as shown.
Figures, 19, and 20, represent a double-flued Lancashire boiler, figure, 19, being
a transverse section one half as at S-S in, and the other half as at T-T io,
figure, 20, whilst figure, 20, is a longitudinal vertical section of one half the length
of the boiler. The flues are each made up of three corrugated lengths, U and two
plain lengths, W, the latter being crossed by conical water tubes. These water
tubes promote circulation; and the interpolition of the plain lengths, W, allows of
moderate expansion.

page_text: 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
The constructing of the furnace shells or flues of steam boilers of segmental
corrugated plates fixed to each other and to other parts of the boilers by means of
flanges projecting outwards at right angles from the plates at their edges substan-
tially as hereinbefore described.