Improvements in Steam Boilers, and in the Furnaces used in connection therewith.
Year: 1897

page_text: Date of Application, 20th Apr., 1907
Complete Specification Left, 20th Jan., 1898-Accepted, 26th Feb., 1898
Complete Specification Left, 20th Jan., 1898-Accepted, 26th Feb., 1898
Improvements in Steam Boilers, and in the Furnaces used in
connection therewith.
We, JOHN COWAN, of 13, South St. Andrew Street, in the City of Edinburgh,
Iron Merchant, WALTER RIDOUT WILLS, of 18, Wemyss Road, Blackheath, in the
County of Kent, Engineer, and JOHN ROXBURGH SHARMAN, of 7, Royal Terrace,
Edinburgh, Engineer, do hereby declare the nature of this invention to be as
follows:
.
This invention has for its object to provide a steam generator which presents a
maximum of heating surface and capacity for raising steam in a minimum
of space, which is very readily and economically constructed and easily
examined, and the parts of which can be so fixed together at the place of manu-
facture that there is but a minimum of skilled labour required at the place of
erection; the parts when so fixed together being well adapted for convenient transit,
for example the boiler can be made in two sections with the tubes expanded into
the drums at the place of manufacture moreover the number of spare parts required
for repairs is reduced to a minimum. A boiler constructed according to this inven-
tion consists of the following arrangement and combination of parts all mounted
and enclosed in a suitable structure on the one hand constituting, or in com-
munication with, a furnace, and on the other hand in communication with a
chimney. At the upper part of the boiler setting we mount two drums, or
chambers, having their steam spaces connected by a pipe, or pipes, or passage,
passing from domes or pipes rising from the upper parts of the said drums or
chambers, which drums or chambers we will refer to as the first steam chamber
and the second steam chamber respectively. The water spaces of the said steam
chambers may also be connected by a pipe or by pipes below the level of the water
line in each chamber. At the lower part of the boiler setting we mount two drums,
or chambers, which we will refer to respectively as the first mud chamber, and the
second mud chamber, they being in communication with each other by means of a
pipe or pipes. Tubes descend from the water space of the first steam chamber and
open into the upper part of the first mud chamber. The plates, or parts, of the first
steam chamber through which these tubes pass are made of recessed flattened form
of slightly larger diameter than, and at right angles to, the tubes, so as to allow
the tubes to be straight to facilitate cleaning and to retain sufficient material at the
original curvature of the plate between each tube to reduce as little as possible the
original strength of the tube plate. Two sets of tubes pass from the water space
of the second steam chamber and descending open into the upper part of the second
mud chamber. The furnace is situated at the lower part of the boiler setting and
may be in the front or back or between the two banks of tubes and the chimney may
be placed at the top on the side opposite the furnace or if more convenient the gases
may be brought down between the back plate and the last baffle and thence to the
chimney by an opening at the bottom. The setting is so constructed, or provided

page_text: with walls between the two sets of tubes from the second steam chamber to the
second mud chamber and between the two steam chambers and the two mud
chambers, that the hot gases, on their way from the furnace to the chimney pass
first up around and amongst the first set of tubes connecting the second steam
chamber with the second mud chamber, and then down around and amongst the
second set of tubes connecting the said chambers and then under, or above, or both
under and above, the first mud chamber and around and amongst the tubes which
connect the first mud chamber with the first steam chamber.
The water passes
from the first steam chamber down the tubes which connect it with the first mud
chamber, and into the said chamber, which may be provided with a deflecting
plate to cause the water to take a circuitous path through the said chamber from
which it passes by the connecting pipe, or pipes, to the second mud chamber from
which it passes up one set of the tubes connecting the second mud chamber with
the second steam chamber it thence passing down the other set of such tubes back
to the second mud chamber so that a circulation of the water is set up and main-
tained.
Heated air may be supplied to the furnace by openings at the upper part of the
front plate, the air being brought down between the front wall and the casing and
admitted to the fire by passages through hollow bricks, or by holes below a solid
brick arch, thus giving a secondary supply of heated air, the amount of which can
be regulated by a regulator in the front plate.
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.
Improvements in Steam Boilers, and in the Furnaces used in
connection therewith.
We, JOHN COWAN, of 13, South St. Andrew Street, in the City of Edinburgh,
Iron Merchant, WALTER RIDOUT WILLS, of 18, Wemyss Road, Blackheath, in the
County of Kent, Engineer, and JOHN ROXBURGH SHARMAN, of 7, Royal Terrace,
Edinburgh, 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 steam generator which presents a
maximum of heating surface and capacity for raising steam in a minimum of space,
which is very readily and economically constructed and easily examined and the
parts of which can be so fixed together, at the place of manufacture that there is but
a minimum of skilled labour required at the place of erection; the parts when sa
fixed together, being well adapted for convenient transit for example the boiler can
be made in two or more sections with the tubes expanded into the drums at the
place of manufacture moreover the number of spare parts required for repairs is
reduced to a minimum. A boiler composed of two sections constructed according to
this invention is illustrated in vertical sections at right angles to each other in
Figures 1 and 2 of the accompanying drawings. It consists of the following
arrangement and combination of parts all mounted and enclosed in a suitable
structure on the one hand constituting, or in communication with, a furnace and
on the other hand in communication with a chimney. At the upper part of the
boiler setting we mount two drums, or chambers, A and B, having their steam

page_text: spaces connected by a pipe, C (or pipes or passage) passing from domes or pipes a b
rising from the upper parts of the said drums or chambers A, B, which drums or
chambers we will refer to as the first steam chamber A and the second steam
chamber B respectively. The water spaces of the said steam chambers may also if
desired be connected by a pipe or by pipes below the level of the water line in each
chamber although this is not shewn in the drawings. At the lower part of the
boiler setting we mount two drums or chambers D and E which we will refer to
respectively as the first mud chamber D and the second mud chamber E respectively.
they being in communication with each other by means of a pipe, or pipes F either
outside the setting as shewn or inside the setting. Tubes G descend from the water
space of the first steam chamber and open into the upper part of the first mud
chamber. The plates, or parts, of the first steam chamber through which these
tubes G pass are made with recessed flat surfaces of slightly larger diameter than,
and at right angles to, the tubes as shewn at a² so as to allow the tubes G to be
straight to facilitate cleaning and to retain sufficient material at the original curva-
ture of the plate between each tube to reduce as little as possible the original
strength of the tube plate. Two sets of tubes H and I pass from the
second steam chamber B and descending open into the upper part of the second
mud chamber E. A pipe or tubes may also be used connecting the steam chamber B
with the mud drum Deither in place of, or in addition to, the connections between
the mud drums D and E. The furnace J is situated at the lower part of the boiler
setting, as shewn in the front, but it may be in the back or between the two banks
of tubes if desired and the chimney K may be placed at the top on the side opposite
the furnace as shewn or between the drums A and B or if desired the gases may be
brought down between the back plate and the last baffle N, and thence to the
chimney by an opening at the bottom. The setting is so constructed, or provided
with two other baffles marked L and M respectively between the two sets of tubes
from the second steam chamber B to the second mud chamber E and between the
two steam chambers and the two mud chambers, that the hot gases, on their way
from the furnace to the chimney, pass first up around and amongst the
first set of tubes I connecting the second steam chamber with the
second mud chamber, and then down around and amongst the second
set of tubes H connecting the said chambers, and then under, or above,
or both under and above, the first mud chamber according to the arrangement of
the wall as will be readily understood and around and amongst the tubes G which
connect the first mud chamber with the first steam chamber. The feed water is led
into the steam chamber A by a pipe or trough q with outlets so arranged as to dis-
tribute the feed water throughout the length of the said chamber, the said water
passing thence from the first steam chamber A down the tubes G which connect
it with the first mud chamber D, and into the said mud chamber, which may be
provided with a deflecting pláte (not shewn) to cause the water to take a circuitous
path through the said chamber from which it passes by the connecting pipe F, (or
pipes, or passage) to the second mud chamber E from which it passes up one set of
the tubes connecting the second mud chamber with the second steam chamber, it
thence passing down the other set of such tubes back to the second mud chamber E
so that a circulation of the water is set up and maintained between the drums B
and E whereas the water in the mud drum D is comparatively at rest thus facilitat-
ing deposit of scale and dirt in the said drum D which is farthest from the fire.
Air may be supplied to the furnace by openings n at the upper part of the front
plate the air being brought down between the front wall and the casing becoming
heated and admitted to the fire by passages p through hollow bricks, or by holes
below a solid brick-arch, thus giving a secondary supply of heated air the amount of
which can be regulated by a regulator in the front plate regulating the capacity of
the openings n.
Although we have shewn but two sections it will be understood that three or more
may be similarly combined if desired.

page_text: Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is:
1. In a steam boiler the arrangement and combination with a setting and furnace
of two or more connected sections each section being composed of a steam and
water chamber and a mud drum beneath connected together by steam and water
pipes substantially as and for the purposes hereinbefore described and illustrated
in the accompanying drawings.
2. In combination with a steam boiler as hereinbefore described and claimed the
formation of the steam and water chamber or chambers with recessed flat surfaces
constituting tube plates at or about right angles to the tubes to enable straight
tubes to be used to facilitate cleaning without reduction of strength substantially as
herein before described and illustrated in the accompanying drawings.
3. The arrangement and combination of parts constituting a steam boiler and
furnace as hereinbefore described and illustrated in the accompanying drawings.
Dated this 20th day of January 1898.
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.