Improvements in Water Tube Steam Boilers.
Year: 1895

page_text: PROVISIONAL SPECIFICATION.
Improvements in Water Tube Steam Boilers.
I, ERNEST PETERSEN, of No. 2 Fountain Court, in the City of London,
Engineer, do hereby declare the nature of this invention to be as follows:-
In the Specifications to my Patent No. 23577 of 1893, and my application for a
Patent No. 23436 of 1894, I have described constructions of steam boilers in which
vater chambers on each side of a fire-grate were connected to an upper water and
team chamber by a number of water tubes arranged in groups and connected at
each end to cups or boxes that were connected respectively to the said upper and
ower chambers. According to my present invention, instead of arranging rows of
such tube-groups on each side of the fire grate as described in the said specifications,
I arrange rows of such tube groups at the inner end of the fire grate, such tube
groups being made to slope forward and upward over the fire grate to the upper
water and steam chamber which is situated over the fire grate with its longitudinal
axis lying in a transverse direction.
The lower water chamber or chambers may be arranged in different ways;
there may either be only a single tubular water chamber situated at the inner end
of the fire grate, the lower boxes, or cups, of the water tube groups being connected
to the said water chamber by pipes in a similar manner to that described in my
said prior specifications or, by preference, I arrange a lower water chamber on each
side of the fire grate, such water chambers being connected firstly by pipes to the
ends of the lower boxes of the tube groups, such boxes being in this case made
tubular and extending from one side of the fire grate to the other. Secondly the
lower water chambers are connected to the upper water and steam chamber by
means of vertical pipes, fixed with their upper ends to rectangular pockets formed
on the lower side of the upper water and steam chamber. These vertical tubes
serve both for the return flow of the water to the lower water chambers and as the
supports of the upper water chamber.
any
of the ways
The tube groups with their cups or boxes may be arranged in
described in the said specification; they may either have cups or boxes at both
ends, or only at the lower end, the upper ends of the tubes being fixed in boles
in the upper water and steam chamber by expanding or otherwise. The lower
hoxes of the tube groups may either be of a rectangular cross-section or they may
be cylindrical, with flat faces at the part where the tubes have to be fixed in.
The feed water heater may consist of a series of horizontal tubes arranged
transversely over the front part of the fire grate, below the upper water and steam
chamber. Two boilers constructed as above described may conveniently be
combined in one casing, back to back, with the uptake between them.
Dated this 23rd day of September 1895.
ABEL & IMKAI,
Agents for the Applicant.

page_text: Aoteam;Bolters.
I, ERNEST PETERSEN, of No. 2 Fountain Court, in the City of London,
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 :-
In my Specifications No. 23577 of 1893, and No. 23436 of 1894; I bave described
constructions of steam boilers in which water chambers on each side of a fire-grate
were connected to an upper water and steam chamber by a number of water tubes
arranged in groups and connected at each end to cups or boxes that were connected
respectively to the said upper and lower chambers. According to my present
invention, instead of arranging rows of such tube-groups. on each side of the fire-
grate as described in the said specifications, I arrange rows of such tube groups at
the inner end of the fire grate, such tube groups being made to slope forward and
upward over the fire grate to the upper water and steam chamber which is situated
over the fire-grate with its longitudinal axis lying in a transverse direction.
The lower water chamber or chambers may be arranged in different ways;
there may either be only a single tubular water chamber situated at the inner
end of the fire grate, the lower boxes, or cups, of the water tube groups being
connected to the said water chamber by pipes in a similar manner to that described
in my said prior specifications or, by preference, I arrange a lower water chamber
on each side of the fire grate, such water chambers being connected firstly by
pipes to the ends of the lower boxes of the tube groups, such boxes being in. this
case made tubular and extending from one side of the fire grate to the other.
Secondly the lower water chambers are connected to the upper water and steam
chamber by means of vertical pipes, fixed with their upper ends to rectangular
pockets formed on the lower side of the upper water, and steam, chamber.
These vertical tubes serve both for the return flow of the. water to the lower
water chambers and as the supports of the upper water chamber.
The tube groups with their cups or boxes may be arranged in any of the ways
described in the said specifications; they may either have cups or boxes at both
ends, or only at the lower end, the upper ends of the tubes being fixed in holes in
the upper water and steam chamber by expanding or otherwise. The lower boxes
of the tube groups may either be of a rectangular cross-section or they may, be
cylindrical, with flat faces at the part where the tubes, have to.be fixed in.
The feed water heater may consist of a series of horizontal tubes arranged
transversely over the front part of the fire grate below the upper water and steam
chamber. Two boilers constructed as above described may conveniently be
combined in one casing, back to back, with the uptake between them.
Figure 1 of the accompanying drawings shews a cross-section of a boiler.con-
structed according to my above described improvements;' Figure 2 shews a part
back view and part longitudinal section looking towards the back.
On each side of the fire grate A are arranged 'the two lower water chambers 'B;
which communicate with the upper water and steam chamber C firstly by means
of the rows of tube groups D at the back of the fire grate and secondly by means
of the vertical tubes G. which serve both for the return flow from the chamber C
to the chambers B, and, for supporting the chamber C, which is constructed with
rectangular recesses Cat the ends for convenience of fixing the tubes G.
The tube groups D are fixed at the upper end directly to the upper water and
steam chamber C, while the lower ends are fixed to boxes E E E E that are of
tubular form, and that extend along the entire length of the boiler.
These tubular boxes are by preference of a cylindrical form with a flat face in
which are formed the holes for the reception of the tubes. The latter are fixed in

page_text: the chamber C and the tubular boxes E¹ &c., by expanding in the usual way, the
tubes being placed in position by inserting them from inside the chamber C, which
is of a somewhat larger diameter than the longest of the tubes D.
The boxes E' &c. have openings at intervals along their length closed by
covers F, as shewn at E, for gaining access to the tubes D for expanding them.
The lowest box E' is connected to the ends of the lower water chambers B by
means of pipes H, and to the box Es by pipes H', while the box E¹ is connected
to the box E by means of flanged branched tubes ee, and the box E' is connected
to E by branches e e^.
The draught from the fire grate A passes transversely through the tube groups
either to an uptake I situated between two such boilers, placed back to back, as
indicated at Figure 1, or, when the boilers are arranged singly, the uptake would
be arranged over the water and steam chamber C, as at Figure 3.
In this modification there is only a single lower water chamber B arranged at the
back of the fire grate, with which the boxes E' E' communicate by pipes H H¹
and branches e. The boxes E E' are in this case shewn of rectangular form.
G Figs. 1 and 2 are the circulating water tubes connecting the ends of B, with the
ends of C. The construction is otherwise similar to that first described. In either
arrangement, instead of fixing the upper ends of the tubes D directly into the
upper chamber C, they may be fixed in conical boxes that are attached to the
chamber C in the same manner as described in the specifications to my before
mentioned prior patents.
K Figure 1 represents tubes constituting the feed water heater.
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. In water tube steam boilers, of the kind herein referred to, the combination
of water chambers B B arranged on each side of the fire-grate with a series of
boxes E' E &c. arranged at the back of the fire grate and connected on the one
hand by tubes H H with the said chambers, and on the other hand by small
tubes D with the upper water and steam chamber C, arranged transversely over
the grate substantially as described with reference to Figures 1 and 2 of the
drawings.
2. In water tube steam boilers constructed as set forth in the first claim,
constructing the ends of the upper chamber C with pockets C₁ to which are
connected the upper ends of vertical water circulating tubes G, the lower ends of
which are connected to the lower water chambers B, substantially as described.
3. In water tube steam boilers of the kind herein referred to, the combination
of a single lower water chamber B arranged at the back of the fire grate with a
series of boxes E' E' &c. also arranged at the back of the firegrate, and connected
on the one hand by tubes H H' with the said chambers, and on the other hand by
small tubes D with the upper water and steam chamber C arranged transversely
of the fire grate, substantially as described with reference to Figure 3 of the
drawings.
Dated this 12th day of June 1896.
ABEL & IMRAY,
Agents for the Applicant.