Improvements in Steam Boilers.
Year: 1894

page_text: Date of Application, 20th Mar.. 1894
Complete Specification Left, 12th Dec., 1894-Accepted, 12th Jan., 1895
PROVISIONAL SPECIFICATION.
Improvements in Steam Boilers.
I, LOCIS IRVING SEYMOUR of Erith Iron Works, Erith, in the County of
Kent, Engineer, do hereby declare the nature of this invention to be as follows:
My invention relates to certain improvements in steam boilers, such improvements
being directed more particularly to what are known as multitubular boilers, or
boilers in which the fire is situated or applied beneath the shell of same the flame
and hot gases passing through the body of same by means of a number of tubes
and subsequently passing to the chimney.
The advantages of this style of boiler consist chiefly in the very large surface
exposed to the hot gases, and consequently large steaming capacity relatively to the
size of boiler. There is however a disadvantage connected with the exposure of
the lower side of the shell of the boiler to the direct heat of the fire, particularly
In case of any
when using high pressures of steam for the following reason.
sediment from the water depositing in the bottom of the boiler the metal shell may
become so heated by the direct action of the fire below it, that the plates
occasionally soften and give way from the high pressure within, causing an explosion
or rupture of the boiler.
It is the object of the present invention to overcome the liability of the shell to
heat while retaining the other advantages of this type of boiler.
To this end I prevent the fire from acting directly on the shell of the boiler by
means of an arch arches or partition of fire brick or suitable material which is
preferably situated beneath the boiler so as to protect the lower portion of the
shell and is somewhat longer than the length of same. The fire and gases thus pass
beneath this partition and enter the tubes of the boiler and instead of passing out
from the tubes directly to the chimney I cause them to pass by a return flue formed
over the top of the boiler shell, along its sides or it may be under the bottom and.
enter the chimney at some suitable point. By this arrangement I obtain the full
heating effects of the hot gases from the fire first in the small tubes and next on the
shell itself.
I also secure the advantage of being able to use more tubes in the boiler if
desired as the upper part of the shell is exposed to the heat from the fire which
permits of tubes being used throughout the diameter of the shell in place of leaving
the upper portion of the boiler free from tubes as in the ordinary type so as to form
a steam space.
In order to secure this steam space in cases where I so use tubes throughout the
diameter of the shell I may attach a drum to the top of the shell by means of two
or more nozzles.
Dated this 20th day of March 1894.
PHILIP M. JUSTICE,
55 & 56, Chancery Lane, London, Chartered Patent Agent,
For the Applicant.

page_text: Improvements in Steam Boilers.
I, LOUIS IRVING SEYMOUR of Erith Iron Works, Erith, in the County of
Kent, 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:-
My invention relates to certain improvements in steam boilers, such improvements
being directed more particularly to what are known as multitubular boilers, or
boilers in which the fire is situated or applied beneath the shell of same, the flame
and hot gases passing through the body of same by means of a number of tubes
and subsequently passing to the chimney.
The advantages of this style of boiler consist chiefly in the very large surface
exposed to the hot gases, and consequently large steaming capacity relatively to the
size of the boiler. There is however a disadvantage connected with the exposure.
of the lower side of the shell of the boiler to the direct heat of the fire, particularly
when using high pressure of steam for the following reason:-
In case of any sediment from the water depositing in the bottom of the boiler
the metal shell may become so heated by the direct action of the fire below it that
the plates occasionally soften and give way from the high pressure within, causing
an explosion or rupture of the boiler.
It is the object of the present invention to overcome the liability of the shell to
heat while retaining the other advantages of this type of boiler.
My invention is illustrated in the accompanying drawing in which :-
Fig. 1 is a sectional elevation of one arrangement or setting of boiler according
to my invention.
Fig. 2 is a cross section of same on the line x-x.
In the arrangement shewn it will be seen that the fire is prevented from acting
directly on the shell a by means of two arches of firebrick or other suitable
material which are somewhat longer than the length of the boiler.
In place of two arches b it will be evident that a single arch or a partition of any
suitable form or other arrangements or settings may be employed which will serve
to prevent the fire acting directly on the bottom of the shell and that the boiler
may be carried directly by the arch, arches or partition, or be carried in some other
suitable way such as by the lugs c shown. The arch, arches or partition & do not
extend much, if at all, beyond the end of the boiler so that the hot gases may pass
around the end of the partition and enter the tubes, as shown by the arrows in the
drawing. Instead however of at once entering the chimney after leaving the tubes
I arrange for the hot gases to return through a flue formed over the top of the
boiler shell or along its sides, or it may be under the bottom, and enter the chimney
at some suitable point such as at the rear end of the boiler as shown. By this.
arrangement I obtain the full heating effects of the hot gases from the fire, first in
the small tubes, and next outside the shell itself. Where the shell is thus heated
there is no danger of sediment forming to any dangerous extent, and besides .this,
the gases have become so far cooled in passing through the tubes that they cannot
heat the shell to a dangerous point as is the case when the shell is directly exposed
to the hottest part of the fire.
By this arrangement I also secure the advantage of being able to use more tubes
in the boiler if desired, as the upper part of the shell is exposed to the heat from
the fire which permits of tubes d being used throughout the diameter of the shell
as shown in Fig. 2, in place of leaving the upper portion of the boiler free from
tubes as in the ordinary type, so as to form a steam space. In order to secure this
steam space in cases where 1 so use tubes throughout the diameter of the shell,

page_text: I attach a drum e to the top of the shell a by means of two or more nozzles ƒ as
shown.
Means may also be provided whereby the products of combustion pass first
through a portion of the tubes running through the boiler and return by passing
through another portion of the tubes in the same boiler.
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 a steam boiler in which the fire does not directly heat the lower portion of
the shell, the arrangement whereby the gases of combustion first pass through tubes
running through the boiler and then outside the shell in contact with same,
substantially as and for the purpose described.
2. The arrangement of a steam boiler whereby the lower portion of the shell is
protected from the direct heat of the fire, and the hot gases pass through tubes in
the shell and then return along the upper part or sides or bottom of the shell before
entering the chimney, substantially as described.
3. In a steam boiler in which the fire does not directly heat the lower portion of
the shell, the employment of tubes throughout the diameter of the shell, a return
flue formed over, alongside, or under the shell, and a suitable steam drum connected
to the shell, substantially as described.
4. In a steam boiler in which the fire does not directly heat the lower portion of
the shell, the arrangement whereby the products of combustion pass first through
part of the tubes of the boiler, and return by passing through another portion of
the tubes in the same boiler, substantially as and for the purpose described.
5. The construction and arrangement of steam boiler, substantially as described
and illustrated.
Dated the 10th day of December 1801
12th day of December 1804
PHILIP M. JUSTICE,
55 & 56, Chancery Lane, London, Chartered Patent Agent,
For the Applicant.