Improvements in Steam Boiler Flues and Tubes.
Year: 1895

page_text: Date of Application, 12th June, 1895
Complete Specification Left, 12th Mar., 1896-Accepted, 18th Apr., 1896
PROVISIONAL SPECIFICATION.
Improvements in Steam Boiler Flues and Tubes.
I, PAUL JOSEPH POMMÉE of Nos. 46-48 Holstentwicte, Altona-Ottensen,.
Germany, Manufacturer, do hereby declare the nature of this invention to be as
follows:-
The present invention relates to improvements in steam boiler flues and tubes.
and the object of the improvements is to produce a flue or tube which partakes of
the advantages both of the tubes or flues made of flat sheets and of those made
of corrugated sheets.
The well known tubes made of a series of tubes welded to one another must be
provided with strengthening hoops, especially when they exceed a certain length,.
or the sheet must have a considerable thickness. The said strengthening hoops,.
which in consequence of their particular mode of application are not much in
favour, may be dispensed with by substituting corrugated tubes, but the latter can.
only be produced by means of special devices which are not generally found in
ordinary boiler works.
To produce tubes of flat sheets of any length and without the above mentioned
strengthening hoops will therefore be a very important progress in boiler-making,.
and this problem is solved by the present invention.
The improved tube or flue consists of a series of tubes the ends or edges of which
are flanged outwards at right angles with the axis of the tube or flue and then.
returned with a forward and upward curve, adapted to embrace or be embraced by
the curve or the end of the adjacent length. The junction of the several lengths
to make them continuous is performed by lapping the adjacent curves one over
the other and welding them together. The hollow ribs or shoulders thus formed
at the junctions, act as strengthening rings and, at the same time, form a reliable
substitute for the strengthening hoops heretofore in use.
The improved flue or tube embraces all the good features of the tubes or flues.
already known, and has also the very important advantage arising from the fact.
that the welds are entirely out of the way of the flames.
Dated this 12th day of June 1895
PHILLIPS & LEIGH,
Agents for the Applicant.
CUAL DIE DIE
Improvements in Steam Boiler Flues and Tubes.
I, PAUL JOSEPH POMMÉE of Nos. 46-48 Holstentwiete, Altona-Ottensen,
Germany, Manufacturer, 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 present invention relates to improvements in steam boiler flues and tubes
and the object of the improvements is to produce a flue or tube which partakes of
the advantages both of the tubes or flues made of flat sheets and of those made of
corrugated sheets.

page_text: The well known tubes made of a series of tubes welded to one another must be
provided with strengthening hoops, especially when they exceed a certain length,
or the sheet must have a considerable thickness. The said strengthening hoops,
which in consequence of their particular mode of application are not much in
favour, may be dispensed with by substituting corrugated tubes, but the latter can
only be produced by means of special devices which are not generally found in
ordinary boiler works.
To produce tubes of flat sheets of any length and without the above mentioned
strengthening hoops will therefore be a very important progress in boiler-making,
and this problem is solved by the present invention.
Referring to the accompanying drawing
Figure 1 is a large longitudinal section of a steam boiler flue made according to
my present invention and illustrated as being held between the bottom-plates of a
steam boiler, and
Figure 2, a detail illustrating the junction of two lengths of my improved boiler
flue or tube prior to welding.
Similar letters indicate similar parts throughout the several views of the
drawing.
The improved tube or flue consists of a series of tubes a the ends or edges of
which are flanged outwards at right angles with the axis of the tube or flue and
then returned with a forward and upward curve b, Figure 2, adapted to embrace
or be embraced by the curve or the end of the adjacent length. The junction of
the several lengths to make them continuous is performed by lapping the adjacent
curves one over the other and welding them together, Figure 1. The hollow ribs
or shoulders thus formed at the junctions b act as strengthening rings and, at the
same time, form a reliable substitute for the strengthening hoops heretofore in use.
The improved flue or tube combines all the good features of the tubes or flues
made of flat sheets and of those made of corrugated sheets; it may easily be be
produced at any length from flat sheets in ordinary boiler works without employing
special devices, it owns notwithstanding the advantage of being expansible in the
direction of its axis, and has also the very important advantage arising from the
fact that the welds are entirely out of the way of flames.
It is obvious that at the weld-seam the material of the tube or flue may be made
thicker by lapping the adjacent curves one over the other in order to obtain a
uniform strength throughout the whole tube without sustaining of the expansibility
in the direction of the axis of the flue.
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 :-
1. A steam boiler flue or tube made of flat sheets and consisting of two or more
tubes the ends or edges of which meeting one another being flanged outwards and
curved in such a manner, that by lapping the adjacent curves one over the other
and welding them together an annular hollow rib or shoulder is formed at the
junction, substantially as and for the purpose set forth.
2. A steam boiler flue or tube consisting of two or more lengths made of flat
sheets and welded together at the junction of the lengths, annular hollow ribs or
shoulders being formed to act as strengthening rings, substantially as set forth.
Dated this 12th day of March 1896.
PHILLIPS & LEIGH,
No. 22 Southampton Buildings, Chancery Lane, London, W.C.,
Agents for the Applicant.