Improvements in Furnaces and Flues for Steam Boilers.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in Furnaces and Flues for Steam Boilers.
OWEN MEREDITH, of 2, Beech Road, Rock Ferry, 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 or flues of steam boilers.
Furnaces according to this invention are of the corrugated type, having in
addition corrugations of small amount formed between the corrugations which
project from the furnace into the water space of the boiler, and the corrugations
or depressions which project on the fire side of the furnace, and it has for its
object to greatly retard the accumulations of scale from the hollows of the afore-
said depressions, by causing part of the scale to rest on the afore said corrugations
of small amount, which are farther away from the furnace fire than the said
depressions, and consequently less dangerous.
My invention consists in forming such furnaces or flues that the corrugations
which project from the furnace into the water space of the boiler, should be
narrower or sharper in contour than the corrugations or depressions or portions
of the furnace which lie between such corrugations and project on the fire side of
the furnace, and I also may form such depressed portions of the furnace cylindrical
in the centre thereof, but prefer they should be rounded.
I also form in addition corrugations of small amount between the afore said
corrugations, and the afore said depressions, the corrugations of small amount
should be narrower or sharper in contour than the said depressions and project
from the water space of the boiler at an angle on the fire side of the furnace.
The thickness of the plate of which the furnace is made of may be uniform or
thickened at the outer corrugations.
DL: 0011
f
1907
Improvements in Furnaces and Flues for Steam Boilers.
I, OWEN MEREDITH, of 2, Beech Road, Rock Ferry, in the County of Chester,
0 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 ascer-
tained in and by the following statement:-
6
My invention relates to the furnaces or flues of steam boilers.
Furnaces according to this invention are of the corrugated type, and the object

page_text: of the present invention is to minimise the deposition of sediment or scale in the
furrows or hollows of such corrugations on the water side.
A corrugated furnace according to the present invention possesses what I may
here term major and minor corrugations. The major corrugations are the corru-
gations proper of the furnace, whilst the principal function of the minor corru-
gations is to minimise the deposition of sediment in the furrows or hollows of
such major corrugations.
In the drawing hereto annexed, Figure 1 and Figure 2 illustrate my improved
mode of corrugating a boiler furnace, Figure 2 being a slight modification of
Figure 1. The major corrugations above referred to are indicated by the letter a,
whilst the minor corrugations are lettered b. It will be seen that the minor
corrugations are formed between the major corrugation which projects into the
water space of the boiler and the major corrugation which projects into the fire
space of the furnace.
By preference I give to the major corrugations which project into the water
space a much sharper contour than that given to the major corrugations which
project on the fire side of the furnace, as will be seen by the radii indicated in
the drawing, and in some cases I form the central portion of the latter corrugation
cylindrical as shewn in Figure 2 and indicated by radii, but I prefer a rounded
formation for all corrugations.
The radii of the major corrugation which projects into the water side, and of
the minor corrugations, coincide with one another in the examples illustrated,
and are indicated by the letter r, but I do not confine myself to this arrangement,
although I at present prefer it.
It will be seen that the minor corrugations 6 operate to intercept some of the
sediment which would otherwise silt into the depressions of the major corrugations.
The sediment or scale is thus distributed over the crown of the furnace instead
of as at present-silting up the depressions or furrows to a considerable depth
whilst the corrugations projecting into the water space are uncovered. In thus
distributing the deposition of sediment more uniformly over the furnace crown,
the objections attending uneven heating of that part of the furnace, due to
uneven deposition of scale, are overcome.
The metal of which the furnace is constructed may be uniform in thickness
throughout, or it may be thickened at the corrugations projecting into the water
side.
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:-
A corrugated furnace or flue possessing major and minor corrugations, such
as a and b, arranged, combined, and operating substantially as and for the pur-
pose herein set forth with reference to the drawing.
Dateu
I day of ouу
1000.
J. A. COUBROUGH,
Chartered Patent Agent,
10, St. Georges Crescent, Liverpool, Agent for the Applicant.