Improvements in Furnaces and Flues for Steam Boilers.
Year: 1896

page_text: Date of Application, 11th Aug., 1896
Complete Specification Left, 17th Apr., 1897-Accepted, 22nd May, 1897
PROVISIONAL SPECIFICATION.
Improvements in Furnaces and Flues for Steam Boilers.
OWEN MEREDITH 46 Laird Street Birkenhead in the County of Chester, Foreman
Boiler Maker, do hereby declare the nature of this invention to be as follows:-
My invention relates to furnaces and flues of the type employed in steam boilers,
and consists in compressing certain parts of such furnaces and flues to a less diameter
a little to one side alternately, between such compressions are formed corrugations or
projections that are round the furnaces and flues, and are of greater depth at the top
of the furnaces and flues than at the bottom, by preference the parts of the furnaces
and flues that are compressed less diameter are to be partly cylindrical, and placed in
line on the fire side of the furnaces and flues a little nearer the bottom, and on the
water side are the corrugations or projections which inrease in depth from the centre
line at the bottom on each side of the furnaces and flues to the centre line at the top,
they also join the compressed less diameter parts.
By my improvements I obtain greater strength to resist external pressure at the top
of the furnaces and flues, and also provides a greater degree of freedom for expansion
and contraction of the heating surface parts owing to the greater depth of the corru-
gations or projections at the top of the furnaces and flues, and again are less likely to
harbour dangerous accumulations of scale because the tops of the furnaces and flues
are partly cylindrical.
Dated this 10th day of August 1896.
I, OWEN MEREDITH, of 46, Laird Street, Birkenhead, in the County of Chester,
Foreman Boiler Maker, 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 :-
My invention relates to the furnaces or flues of steam generators.
Furnaces according to this invention are of the well known corrugated type, and
for the purposes of the invention the corrugations may take various shapes, but
I prefer that the corrugations which project from the furnace into the water space of
the boiler should be narrower or sharper in contour than the depressions or portions of
the furnace which lie between such corrugations and project on the fire side of the
furnace, and I also prefer that such depressed portions of the furnace should be partly
flat or truly cylindrical in the centre thereof.
My invention consists in so forming such furnaces or flues that the parts most
affected by the heat of the fire are rendered stronger than the parts which are less
exposed to such heat, and whereby such highly heated parts have increased capacity
for expansion and contraction.

page_text: In carrying out my invention I form the corrugations in the furnace or flue deeper
at the crown or upper part thereof than at the bottom or lower part of the furnace or
flue. In this way I strengthen the furnace at the part where it is liable to become
burnt through the deposition of scale and the like and consequently weakened, and at
the same time I provide for greater expansion and contraction of the metal at the top
or hottest part of the furnace.
In order that my invention may be clearly understood I have annexed a drawing,
in which Figure 1 is a cross section and Figure 2 a side section of a furnace corrugated
according to my invention.
In the figures, A indicate the corrugations projecting into the water space of the
boiler, and B the corrugations or depressions on the fire side of the furnace. In
rolling the furnace I form the corrugations A deeper at the crown of the furnace than
at the bottom, the depth of the corrugations at the crown being indicated by the
distance marked on the drawing, and the depth of the corrugations at the bottom
being indicated by the distance y.
It will be seen that the corrugations A become gradually shallower as they proceed
downwards and approach the bottom of the furnace, and-diagrammatically-I prefer
to strike the circle of the corrugations A and the circle of the depressions B from
different centres, as indicated in Figure 1.
It must be understood that I do not confine myself to the employment of corrugations
of any particular contour, inasmuch that this invention refers not to the contour but to
the different depths-at the upper and lower portions of the furnace respectively-of
a corrugation.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
-claim is :-
Forming the corrugations of furnaces or flues of the type herein specified, deeper at
the crown or upper portion thereof than at the bottom thereof, substantially as and for
the purposes
herein described.
Dis 14th day of April 1
J. A. COUBROUGH,
Registered Patent Agent (Qual. by Exam.),
10 St. George's Crescent, Liverpool, Agent for the Applicant.