Improvements in Steam Bollers.
Year: 1894

page_text: Date of Application, 17th July, 1894
Complete Specification Left, 16th Apr., 1895-Accepted, 18th May, 1895
PROVISIONAL SPECIFICATION.
Improvements in Steam Bollers.
I, ALLAN STIRLING, of 93, Hope Street, in the County of the City of
Glasgow, North Britain, Engineer, do hereby declare the nature of this invention
to be as follows, that is to say :-
This invention relates to steam boilers of a kind having water tubes combined
with horizontal cylindrical shells or drums; and it comprises modifications of or
improvements on steam boilers such as are described in the British Patent
Specification No. 13,614 of 1892.
In carrying out the present invention according to one modification a bottom
drum or cylindrical shell is connected by three sets of water tubes to one upper
drum or cylindrical shell which latter is, in normal working, occupied partly by
water and partly by.steam, near the bottom drum there is a furnace arranged to
cause the fire gases to enter between the lower parts of one set, hereinafter termed
the first set of water tubes. A partition extends at the inner sides of the first
set of tubes, from the bottom drum up to a certain distance short of the upper
drum, the fire gases pass upwards amongst the tubes of the first set and next
proceed across the partition to the upper parts of the next or second set of water
tubes. The partition is arranged to compel the fire gases to enter amongst the
second set of water tubes and a second partition extending part way down their
inner sides makes the fire gases descend amongst the second set of the tubes, from
the lower parts of which they proceed under the second partition and entering
amongst the third set of water tubes pass upwards to the uptake or chimney.
Walls enclose the space containing the water tubes and furnace."
According to a second modification a bottom drum or cylindrical shell is
connected by three sets of water tubes to two upper drums or cylindrical shells.
The fire gases pass upwards amongst the tubes of the first set and next proceed
across the top of a partition to the upper parts of the next or second set of water
tubes. Walls enclose the space containing the water tubes and bottom drum and
the part of the space between the two upper drums is covered. The partition
hereinhefers referred to is arranged to compel the fire gases to enter amongst the
second set of water tubes; and a second partition extending part way down their
inner sides makes the fire gases descend amongst the tubes, from the lower parts
of which tubes they proceed under the second partition, and entering amongst the
third set of water tubes pass upwards to the uptake or chimney. The upper or
Eteam spaces of the upper druns are connected by one or more pipes, and their
lower or water spaces may be similarly connected. The water supply is fed,
preferably, into the inuer or after upper drum, which is connected by both the
second and third sets of water tubes to the bottom drum.
The single drum of the first modification, or inner or after upper drum of the
second modification may in some cases have fixed in it a partition dividing the
water space into two parts, and the water supply may be fed in on the after side
of the partition, that is, into the space to which the upper ends of the third set of
water tubes are connected.
Instead of the second and third set of water tubes being both connected to the
inner or after upper drum the whole or some of the second set may be connected to
the front upper drum as well as the first set. Or the three sets of water tubes.

page_text: may be severally connected to threetupper drums, the upper or steam spaces of the
three upper drums being put in communication by pipes between the front and
middle drum and between the middle drum and the after drum, and the lower or
water spaces being similarly connected by other pipes.
Dated this Sixteenth day of July 1894.
EDMUND HUNT,
Applicant's Agent.
Improvements in Steam Boilers.
I, ALLAN STIRLING, of 93, Hope Street, in the County of the City of
Glasgow, North Britain, 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, that is to say :-
This invention relates to steam boilers of a kind having water tubes combined
with horizontal cylindrical shells or drums; and it comprises modifications of or
improvements on steam boilers such as are described in the British Patent
Specification No. 13,614 of 1892.
Modifications of steam boilers as made according to my invention are shown.on
two accompanying sheets of explanatory drawings, Figures, 1, and 2, on Sheet, .1,
thereof, being vertical sections of two modifications and Figure, 3, on Sheet, 2,
a vertical section of another modification.
.In these drawings the same reference letters are used to mark the same.or like
parts wherever they are repeated.
..In the modification shown in Figure, 1, a bottom drum or cylindrical shell, A,
is connected by three sets of water tubes, B, C, and D, to one upper drum or
cylindrical shell, F, which latter is in normal working, occupied partly by water
and partly by steam. Near the bottom drum, A, there is a furnace, G, arranged
to cause the fire gases to enter between the lower parts of one set hereinafter
termed the first set of water tubes, B. A partition, H, extends at the inner sides
of the first set of tubes, B, from the bottom drum, A, up to a certain distance
short of the upper drum, F. The fire gases pass upwards amongst the tubes of
the first set, B, and next proceed across the partition, H, to the upper parts of
the next or second set of water tubes, C. The partition, H, is arranged to
compel the fire gases to enter amongst the second set of water tubes, C, and.a
second. partition, J, extending part way down their inner sides makes the fire
gases descend amongst the second set of tubes, from the lower part of which
they proceed under the second partition, J, and entering amongst the third set. of
water tubes, D, pass upwards to the uptake or chimney, E. Walls, K, enclose the
space containing the water tubes, B, C, and D, and furnace, G, and on the former
there is a projection, L; to compel the fire,gases to circle about the upper parts of
the third set of tubes, D.
According to the second modification shown in Figure, 2, a bottom drum.or
cylindrical shell, A, is connected by three sets of water tubes, B, C, and D, to two
upper drums or cylindrical shells, F, and M. The fire gases pass upwards
amongst the tubes, B, of the first set and next proceed across the top.of.a
partition, H, to the upper parts of the next or second set of water tubes, C.
Walls, K, enclose the space containing the water tubes and bottom drum,-A;
and the part of the space between the two upper drums, E, and M, is covered by
brick or other material, N. The partition, H, herein before referred to is arranged
to compel the fire gases to enter amongst the second set of water tubes, C; and a
second partition, J, extending part way down their inner sides makes the fire
gases. descend amongst the tubes from the lower parts of which tubes they proceed

page_text: under the second partition, J, and entering amongst the third set of water tubes, D,
pass upwards to the uptake or chimney, E. The upper or steam spaces of the
upper drums, F, and M, are connected by one or more pipes, P, and their lower or
water spaces are similarly connected by pipes, Q. The water supply is fed,
preferably, into the inner or after upper drum, F, which is connected by both the
second and third sets of water tubes, C, and D, to the bottom drum, A.
The single drum, E, of the first modification or inner or after upper drum of the
second modification may in some cases have fixed in it a partition, R, dividing
the water space into two parts, and the water supply may be fed in by means of
an inlet, S, on the after side of the partition, that is, into the space to which the
upper ends of the third set of water tubes, D, are connected.
Instead of the second and third sets of water tubes, C, and D, being both
connected to the inner or after upper drum, F, the whole or some of the second
set, C, may be connected as indicated by dotted lines to the front upper drum, as
well as the first set, B. In this case the brick covering (N) would be placed
higher so as to enclose the tubes, C, and the joint, T, of the drum plates be
arranged farther round.
According to the modification shown in Figure, 3, the three sets of water
tubes, B, C, and D, are severally connected to three upper drums, F, M, and V,
the upper or steam spaces of the three upper drums being put in communication
by pipes, P, between the front and middle drum and between the middle drum and
the after drum and the lower or water spaces being similarly connected by other
pipes, Q.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is :-
1
1. A steam boiler comprising a bottom drum connected by three sets of water
tubes to one upper drum, divided by a partition, and into which the water supply
is fed, the water tubes and bottom drum being enclosed by walls containing a
furnace from which the fire gases pass amongst the tubes to a chimney at the
top, being guided by partitions placed between the tubes substantially as
herein before described with reference to Figure, 1, of the accompanying
drawings.
2. A steam boiler comprising a bottom drum connected by three sets of water
tubes to two upper drums having their water and steam spaces connected by pipes,
the water tubes and bottom drum being enclosed by walls containing a furnace,
from which the fire gases pass amongst the tubes to a chimney at the top, being
guided by partitions, placed between the sets of tubes, substantially as hereinbefore
described, with reference to Figure, 2, of the accompanying drawings.
3. A steam boiler comprising a bottom drum connected by three sets of water
tubes to three upper drums into one of which the water supply is fed, the steam
and water spaces of all three drums being both connected by pipes substantially
as hereinbefore described with reference to Figure, 3, of the accompanying
drawings.
Dated this Thirteenth day of April 1895.
EDMUND HUNT,
Applicant's Agent.