Improvements in Steam Generators Constructed with Furnace Tubes.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improvements in Steam Generators Constructed with Furnace Tubes.
We, THE LEEDS FORGE COMPANY, LIMITED, of Leeds Forge, Leeds, in the
County of York, Engineers and Iron Masters, and GEORGE COOPER, of the same
place, Engineer, do hereby declare the nature of this invention to be as follows:---
The object of this invention is the production by rolling and without cutting
away the end obliquely, or setting in the lower portion of the tube, of a furnace
flue which shall be capable of insertion and withdrawal through the front plate
of the boiler.
For this purpose, a furnace flue or tube, according to this invention, is rolled
yith a portion of its length, constituting the rearward portion, co-axial with but
of smaller external diameter than the main portion of the flue or tube, and such
reduced portion is formed with a tube plate flange whose greatest width is less
than the diameter of the opening in the front plate of the boiler through which
the rearward end of the flue or tube is to be introduced and withdrawn, the said
tube plate flange being formed with reverse flanges, as well understood.
In some cases when making corrugated flues we complete the formation of the
reduced end (except as to the flanges) at the same time as the corrugations are
rolled.
Improvements in Steam Generators Constructed with Furnace Tubes.
We, THE LEEDS FORGE COMPANY, LIMITED, of Leeds Forge, Leeds, in the
County of York, Engineers and Iron Masters, and GEORGE COOPER, of the same
place, 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 the production by rolling and without cutting
away the end obliquely, or setting in the lower portion of the tube, of a furnace
flue which shall be capable of insertion and withdrawal through the front plate
of the boiler.
For this purpose, a furnace flue or tube, according to this invention, is rolled
with a portion of its length, constituting the rearward portion, co-axial with, but
D •

page_text: of smaller external diameter than, the main portion of the flue or tube, and such
reduced portion is formed with a tube plate flange whose greatest width is less
than the diameter of the opening in the front plate of the boiler through which
the rearward end of the. flue or tube is to be introduced and withdrawn, the said
tube plate flange being formed with reverse flanges, as well understood.
In some cases, when making corrugated flues we complete the formation of the
reduced end (except as to the flanges) at the same time as the corrugations are
rolled.
Referring to the accompanying drawings,
Fig. 1 is a longitudinal section through the combustion chamber and the back
end of the furnace tube of a steam generator constructed with a furnace tube
as hereinbefore described; Fig. 2 is an end view of the said furnace tube; and
Fig. 3 is a longitudinal section showing the back end of the furnace tube located
within the opening in the front plate of the generator. The furnace tube 1,
which, in the example, is corrugated, is rolled with a reduced co-axial or concen-
tric rearward portion 1 that is formed with a tube-plate flange 1b whose greatest
width is less than the diameter of the opening 2 in the front plate 3 of the genera-
tor; the bottom plate 4 of the combustion chamber 5 is curved to a radius corres-
ponding to the reduced part 1 of the tube 1, which is riveted to it. As will be
seen from Fig. 3, the furnace tube is capable of being introduced and withdrawn
through the opening 2 by lowering and canting the tube so that the tube-plate
flange 1 can pass therethrough.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed we declare that what
we claim is:-
1. Steam generators constructed with one or more furnace tubes each of which
is rolled with a reduced co-axial or concentric rearward portion formed with a
tube-plate flange whose greatest width is less than the diameter of the opening
in the front plate of the generator through which the rearward end of the tube
is to be introduced and withdrawn, substantially as described.
2. Steam generator furnace tubes or flues constructed as herein before described
and illustrated, whereby, without cutting away the end obliquely or setting in
the lower portion of a tube, it is made capable of insertion and withdrawal through
the front plate of a boiler, as set forth.
TY
101 1
1
1000
Dated this 19th day of February 1000.
For the Applicants,
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.