Improvements in or connected with Tubular Steam Boilers.
Year: 1892

page_text: Date of Application, 17th May, 1892
Complete Specification Left, 16th Feb., 1893-Accepted, 25th Mar., 1893
PROVISIONAL SPECIFICATION.
Improvements in or connected with Tubular Steam Boilers.
A communication by VICTOR CONSTANT JOSEPH LAURENT and EUGENE
SCHERDING, both of 15, Rue du Louvre, Paris, in the Republic of France,
Engineer and Merchant, respectively.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of the Agency for
Foreign Patent Solicitors, 6, Lord Street, Liverpool, and 6, Bank Street, Man-
chester, both in the County of Lancaster, and 323, High Holborn, in the County of
Middlesex, Civil Engineer, do hereby declare the nature of this invention to be as
follows:-
This invention has for its object to provide a tubular boiler arranged more
particularly with the view of causing the hot gases coming from the fire box
to traverse the boiler twice, thus realising an important saving in the fuel
employed.
The boiler is composed of a cylindrical body, the tubular portion of which is
divided into two groups of tubes, placed one above the other and separated by a
suitable interval of space; these tubes, which need not necessarily be of the same
section for each group, end at their back extremities in a smoke box, and, at their
front extremities, in a chamber divided into two compartments by a boiler tube,
preferably horizontal, communicating with the boiler by means of pipes.
The lower compartment constitutes the fire box and it is provided with a suitable
grate, and the upper compartment carries a chimney which may be provided with a
regulating valve, the object of which is to regulate the draught of the furnace ;
finally, a movable valve, placed either in front of or behind the heating tube, which
may be hinged or may work on a slide if preferred, completes the separation
between the two compartments and allows them to be placed in communication one
with the other if required.
It is understood that, in ordinary working, the movable valve is closed in such a
way that it shuts off any passage to the heated gases proceeding from the fire box
and which circulate first into the lower group of tubes and then into the upper
group of tubes in order to finally reach the upper compartment and from thence the
chimney.
In this manner, the gases coming from the fire bax traverse the boiler twice, as
has been already stated, which ensures complete utilisation of the heat which they
contain before their exit from the chimney. In order to facilitate the lighting of
the fire, it is, on the contrary, advantageous that the lower compartment may be
placed in direct communication with the chimney, and this result is attained by
opening the movable valve, but, as soon as the fire is well started, this valve is shut
down and the apparatus works in the manner herein before described.
Finally, in order to avoid any loss of heat in the passage of the gases into the smoke
box, this box is provided with an internal casing, the vertical face of which is
preferably formed by a heat tube perforated with holes intended to allow of the
tubes being cleaned, and which are covered by an unperforated plate hinged at its
lower part; this plate may also be employed alone when it is desirable to dispense
with the heating tube for greater simplicity. The bottom plate of this box is
hinged in order to allow of the ashes dropping out during the cleaning of the
tubes, and the other parts are also hinged for the purpose which will be hereinafter
described.
It is understood that the essential principle of the invention consists in forcing
the heated gases from the fire box to traverse successively two groups of tubes

page_text: placed in the interior of a single cylindrical body and without coming in contact
with the casings exposed to external cooling, but it is not intended to limit it to any
form or special arrangement, but, on the contrary, this system may be varied
according to whether it is to be applied to a locomotive or a ship's boiler, or to a
fixed industrial boiler, or finally, according to the nature of the fuel employed.
Thus, for instance, the movable valve may be dispensed with when the draught
is sufficient to allow of the fire being lighted; in this case, the heating tube may
also be replaced by a double bottom platform, forming the top of the lower
compartment, the upper compartment then constituting an ordinary smoke box.
It is also understood that, without modifying the hereinbefore described arrange-
ment and whatever applications may be made of it, if it be thought fit, the apparatus
may be utilised as a boiler having a single passage of the flame by arranging, on the
smoke box, a second chimney. In this case, the regulating valve of the chimney
must be closed, whilst the movable valve must remain constantly open as well as
one or other of the face plates of the box contained in the smoke box; in this
manner, the gases of the furnace will simultaneously traverse the two groups of
tubes in order to pass into the auxiliary chimney.
Finally, it will be seen that, by keeping the face plate of the internal casing of
the smoke box closed, and keeping only the opening at the bottom of the smoke box
open, the heated gases will be forced to flow round the lower part of the vertical
plate of the smoke box, which will cause their equal distribution in all the tubes of
the boiler, and, consequently, a better utilisation of the heat which they contain.
The same results may be also attained by means of a single chimney arranged in
such a way as to allow of its being placed in communication, as desired, with one or
other of the smoke boxes.
Dated this 16th dox of Mo- 1900
WM. P. THOMPSON & Co.,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in or connected with Tubular Steam Boilers.
A communication by VICTOR CONSTANT JOSEPH LAURENT and EUGENE
SCHERDING, both of 15, Rue du Louvre, Paris, in the Republic of France,
Engineer and Merchant, respectively.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of the Agency for
Foreign Patent Solicitors, 6, Lord Street, Liverpool, and 6, Bank Street, Manchester,
both in the County of Lancaster, and 323, High Holborn, in the County of
Middlesex, Civil 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 has for its object to provide a tubular boiler arranged more
particularly with the view of causing the hot gases coming from the fire box
to traverse the boiler twice, thus realising an important saving in the fuel
employed.
The invention will now be described in detail with reference to the accompanying
drawing, on which :-
Figure 1 is a longitudinal section of the boiler and
Figure 2 is a transverse section through the fire box.
As shown on the drawing, the boiler is composed of a cylindrical body a, the
tubular portion of which is divided into two groups of tubes b and c, placed one
above the other and separated by a suitable interval of space; these tubes, which
need not necessarily be of the same section for each group, end at their rear in a
common smoke box d, and their front ends open into a chamber divided into two
compartments e and by a boiler tube g, preferably horizontal, communicating with
the boiler by means of pipes h.

page_text: The lower compartment f forms the fire box, and it is provided with a suitable
grate i, and the upper compartment e carries a chimney which may be provided
with a regulating valve k, the object of which is to regulate the draught of the
furnace; finally, a movable valve 1, placed either in front of or behind the
heating tube, which may be hinged, as shown on the drawing, or may work on
a slide if preferred, completes the separation between the two compartments e
and and allows them to be placed in communication one with the other if
required.
It is understood that, in ordinary working, the movable valve / is closed and
placed in the position shown on the drawing in such a way that it shuts off any
passage to the heated gases proceeding from the fire box f, and which circulate,
as shown, first into the lower group of tubes 6 and then into the upper group c,
in order to finally reach the upper compartment e and from thence the chimney j.
In this manner, the gases coming from the fire box traverse the boiler twice, as
has been already stated, which ensures complete utilisation of the heat which they
contain before their exit from the chimney. In order to facilitate the lighting of
the fire, it is, on the contrary, advantageous that the lower compartment / may be
placed in direct communication with the chimney, and this can be effected by
opening the movable valve l, but, as soon as the fire is well started, this valve is
shut down and the apparatus works in the manner herein before described.
Finally, in order to avoid any loss of heat in the passage of the gases into the
smoke box d, this box is provided with an internal casing, consisting of the
parts m, n, o p q; m is a vertical compartment or tube through which the gases,
in the course of their travel, may pass by means of the perforated holes therein, these
perforated holes are also intended to allow of the tubes being cleaned, and which
are covered by an unperforated plate n hinged at its lower part; this plate n may
also be employed alone when it is desirable to dispense with the part m for greater
simplicity. The bottom plate g of this box is hinged in order to allow of the ashes
dropping out during the cleaning of the tubes, and the other parts o and p are also
hinged for the purpose which will be hereinafter described.
It is understood that the essential principle of the invention consists in forcing
the heated gases from the fire box to traverse successively two groups of tubes
placed in the interior of a single cylindrical body and without coming in contact
with the casings exposed to external cooling, but it is not intended to limit it to
any form or special arrangement such as shown on the accompanying drawing, but,
on the contrary, this system may be varied according to whether it is to be applied
to a locomotive or a marine boiler, or to a fixed industrial boiler, or finally,
according to the nature of the fuel employed.
Thus, for instance, the movable valve / may be dispensed with when the
draught is sufficient to allow of the fire being lighted; in this case, the heating
tube g may also be replaced by a double bottom platform, forming the top of
the lower compartment the upper compartment e then constituting an ordinary
smoke box.
It is also understood that, without modifying the arrangement herein before
described and shown on the accompanying drawing and whatever applications may
be made of it, if it be thought fit, the apparatus may be utilised as a boiler having
a single passage of the flame by arranging, on the smoke box d, a second chimney,
such as is shown in dotted lines in the drawing. In this case, the regulating valve k
of the chimney j must be closed, whilst the movable valve must remain con-
stantly open as well. as one or other of the face plates o and p of the box
contained in the smoke box d; in this manner, the gases of the furnace will
simultaneously traverse the two groups bc of tubes in order to pass into the
auxiliary chimney.
Finally, it will be seen that, by keeping the face plate o of the internal casing
of the smoke box closed, and keeping only the opening p at the bottom of the
smoke box open, the heated gases will be forced to flow round the lower part of
the vertical plate n of the smoke box, which will cause their equal distribution in

page_text: all the tubes of the boiler, and, consequently, a better utilisation of the heat which
they contain.
The same results may be also attained by means of a single chimney arranged in
such a way as to allow of its being placed in communication, as desired, with one or
other of the smoke boxes d and e.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, as communicated to me
by my foreign correspondents, I declare that what I claim is :-
1. A horizontal boiler having one body containing two groups of tubes placed
one above the other, opening at the rear into a common smoke box, and in front
into a chamber forming an integral part of the boiler, and divided into two com-
partments corresponding to each of the above, named groups of tubes, by means
of a horizontal boiler tube and a movable valve arranged in continuation of
the same, the lower compartment forming the fire box, and the upper one the
smoke box, and receiving the chimney substantially as hereinbefore described in
detail and shown.
2. In a horizontal tubular boiler such as described in Claim 1, the addition, in
the smoke box placed at the rear of the boiler, of a box the walls n o p q of which
are movable, in order to allow of the hot gases coming from the two groups of
tubes b and c being discharged into an auxiliary chimney, and of causing them to
pass either above or below the vertical bottom plate of the box, substantially as
hereinbefore described in detail.
3. In a horizontal tubular boiler such as described in Claims 1 and 2, the
arrangement, in the above mentioned box, of a vertical boiler plate, such as m,
perforated with holes in such a way as to allow of the boiler tubes being cleaned,
substantially as herein before described in detail.
Dated this 15th day of February 1893.
WM. P. THOMPSON & Co.,
Agents for the Applicant.