Improvements in Vertical Boilers.
Year: 1895

page_text: Date of Application, 5th Oct., 1895
Complete Specification Left, 23rd Dec., 1895-Accepted, 25th Jan., 1896
PROVISIONAL SPECIFICATION.
Improvements in Vertical Boilers.
I, THOMAS SUDRON, of the Imperial Boiler Works, Stockton-on-Tees, in the
County of Durham, Engineer, do hereby declare the nature of this invention to be
as follows:-
It has reference to a class of vertical boiler containing a nest of flame tubes,
arranged approximately horizontally, to connect a combustion chamber, situated
on the top of a portion of the fire box crown, with an uptake outside the boiler.
Disadvantages arise from this otherwise satisfactory mode of arrangement, first,
from the great amount of heating surface thrown into the upper portion of the
boiler; which, taken together with the somewhat staguant condition of the water
below, is anything but satisfactory, tending to cause priming when the boiler is
hard pressed. Secondly, because the usual dome or crown over the fire is, in
this arrangement of boiler, broken in its continuity, giving rise to serious strains
liable to end in a collapse.
The object of the invention is to provide (1) better circulation; (2) additional
heating surface; and (3) powerful stays for securing the unbalanced half of the
fire box crown or dome; with, as a subsidiary, an arrangement of an additional
manhole, to give access to every part of the boiler near to the fire box crown, tube
plates, both flame and water tubes, and the sides of the combustion chamber, etc.
A result of a better circulation is not only one giving a better steaming action,
but also one demanding less time for steam raising; often very important.
I carry out my object as follows:-I arrange, with a considerable upward slant,
one or more (according to the size of the boiler) water tubes, leading them, from
the lower portion of the fire box side, up to the unbalanced crown, or dome,
above.
The three-fold result follows; viz. :-The water is forced by the heat playing on
the angled water tubes, to circulate freely up through the same, providing in so
doing a full flow of water up to and amongst the flame tubes above, thus giving a
thorough circulation throughout the boiler. An increased and very effective
heating surface is provided according to the size and number of the slanting tubes
fitted; and staying power of great importance is given to the unbalanced portion
of the fire box crown, doing away with the chances of its collapsing.
To give additional access to the vital parts of the boiler for cleaning, repairs, &c.,
I arrange a manhole, as before mentioned, on that portion of the outer plate that
lies below the nest of flame tubes.
Dated this 4th day of October 1895.
WM.
SNOWDON,
9 Old Bank Chambers, Leeds, Yorks, Agent for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in Vertical Boilers.
I, THOMAS SUDRON, of the Imperial Boiler Works, Stockton-on-Tees, in the
County of Durham, 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:-
It has reference to a class of vertical boiler containing a nest of flame tubes,
arranged approximately horizontally, to connect a combustion chamber, situated on
the top of a portion of the fire box crown, with an uptake outside the boiler.
Disadvantages arise from this otherwise satisfactory mode of arrangement; first,
from the great amount of heating surface thrown into the upper portion of the
boiler; which, taken together with the somewhat stagnant condition of the water
below, is anything but satisfactory, tending to cause priming when the boiler is
hard pressed. Secondly; because the usual dome or crown over the fire is, in this
arrangement of boiler, broken in its continuity, giving rise to serious strains liable
to end in a collapse.
The object of the invention is to provide (1) better circulation; (2) additional
heating surface; and (3) powerful stays for securing the unbalanced half of the
fire box crown or dome; with, as a subsidiary, an arrangement of an additional
manhole, to give access to every part of the boiler near to the fire box crown, tube
plates, both flame and water tubes, and the sides of the combustion chamber, etc.
A result of a better circulation is not only one giving a better steaming action,
but also one demanding less time for steam raising; often very important.
In order to fully explain my improvements I have annexed two sheets of
drawings, on which
Fig. 1 is a sectional elevation ;
Fig. 2 a half-sectional plan with the flame tubes omitted; and
Fig. 3 (on the second sheet) is an elevation at right angles to that in Fig. 1,
partly in section, of a boiler made on my plan.
The same letters refer to the same parts in all the figures.
A is the fire box; B the combustion chamber; C, C, the nest of flame tubes ;
D the smoke box; and E the uptake. The other features of such a boiler are a
set of gusset stays F for the boiler crown; two or more roof stays G supporting
the top of the combustion chamber; fire box stays H as shown; a cross stay J
binding together the barrel of the boiler where cut into by the nest of flame tubes;
and a manhole K in the upper part of the boiler.
I carry out my object as follows:-First, I arrange, with a considerable upward
slant, one or more (according to the size of the boiler) water tubes, L, L, leading
them from the lower portion of the fire box side up to the unbalanced crown, or
dome, above, as shown. These tubes I arrange with their flanges in the firebox
for the purpose of easy renewal in the future; and by preference I make them
taper, with the narrow opening at the lower end, opposite which I arrange a hand
hole M as shown in Fig. 1.
The threefold result follows; viz. :-'
-The water is forced by the heat playing on
the angled water tubes, to circulate freely up through the same, providing in so
doing a full flow of water up to and amongst the flame tubes above, thus giving a
thorough circulation throughout the boiler. An increased and very effective
heating surface is provided according to the size and number of the slanting tubes
fitted and staying power of great importance is given to the unbalanced portion
of the fire box crown, doing away with the chances of its collapsing.
Secondly, to give additional access to the vital parts of the boiler for cleaning,
repairs, &c., I arrange an additional manhole N, on that portion of the outer plate
that lies below the nest of flame tubes, as shown. The stay J may with advantage

page_text: be made somewhat stronger, and then pierced with holes, in order to liberate more
freely any steam formed below it, and also assist the circulation of water above it.
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 boiler of the type set out, the use of one or more slanting water
tubes L, L, introduced into the fire box and arranged to act as (amongst other
things) stays to the fire box crown, substantially as described and shown, with the
object and for the purpose set forth.
2. In a boiler of the type set out, the use of one or more tapering water tubes
introduced into the fire box and arranged to act (amongst other things) both as a
stay to the fire box crown, and an improver of the water circulation through the
nest of the flame tubes overhead, substantially as described and shown, with the
object and for the purpose set forth.
3. One or more slanting water tube stays in combination with a fire box crown
whose upper half is cut away for a combustion chamber, substantially as described
and shown, with the object and for the purpose set forth.
4. The general arrangement of the whole steam-raising boiler, with slanting
water tubes L, L, additional manhole N, and perforated stay J, substantially as
described and shown, with the object and for the purpose set forth.
Dated this 21st day of December 1895.
WM. SNOWDON,
9 Old Bank Chambers, Leeds, Yorks, Agent for the Applicant..