Improvements in or relating to Furnace -Flues.
Year: 1891

page_text: Date of Application, 17th Dec., 1891
Complete Specification Left, 15th Sept., 1892-Accepted, 15th Oct., 1892
PROVISIONAL SPECIFICATION.
Improvements in or relating to Furnace -Flues.
1, THOMAS MUDD of Central Marine Engine Works, West Hartlepool, in the
County of Durham, Engineer, do hereby declare the nature of this invention to be
as follows:-
-:
This invention relates to certain improvements in furnace flues of corrugated
metal, and the invention is so desigued that the thin and flexible parts arch towards
the steam pressure, while the more rigid parts form the abutments to these
arches.
In carrying my invention into effect, I form the corrugated flue thicker on the
salient points than between them, the arching thin part being made so that end-on
stresses have a tendency to lift the arches or convexities of the corrugations higher,
and against the steam pressure.
The smaller diameters or concavities of the
corrugations are made with a little thickening at the bottom to form abutments to
the arches of the corrugation.
Dated this 16th day of December 1891
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Patent Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in or relating to Furnace Flues.
I, THOMAS MUDD of Central Marine Engine Works, West Hartlepool, in the
County of Durham, 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 :-
This invention relates to certain improvements in furnace flues of corrugated
metal, and the invention is so designed that the thin and flexible parts arch
towards the pressure, while the more rigid parts form the abutments to these
arches.
The invention will be understood from the following description, reference being
had to the accompanying drawings, in which :-
Figures 1 and 2 represent, in section, two forms of the furnace or tube plate, the
fire side and water side being depicted thereon.
I form the corrugated flue thicker on the salient points A than between them,
the arching thin part B being made so that end-on stresses have a tendency to
lift the arches or convexities of the corrugations higher, and against the steam or
water pressure.
The smaller diameters or concavities of the corrugations are
made with a little thickening at the bottom to form abutments to the arches of the
corrugation.
By this invention, circumferential strength is secured with endwise flexibility.
The thicker parts act as abutments to the arches, and are relied upon principally
for circumferential strength, while the thinner arched parts secure to the tube or
furnace endwise flexibility.
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 improvement in corrugated flues or furnaces which consists in making the
thin and flexible parts to arch outwards towards the pressure, and the thicker parts

page_text: to form abutments to the arches, whereby circumferential strength is secured
combined with end wise flexibility, the thick parts of smaller diameter being relied
upon principally for circumferential strength and the thin arched parts for flexibility
endwise.
Dated this 14th day of Sentember 1800
WM. P. THOMPSON & Co.,
Of Liverpool, Manchester, Nottingham, and London, Patent Agents.