Improvements in Steam Boilers.
Year: 1892

page_text: Date of Application, 31st Dec., 1392-Accepted, 4th Feb., 1893
COMPLETE SPECIFICATION.
Improvements in Steam Boilers.
We, PETER FERGUSON and WILLIAM YOUNG FLEMING both of Phoenix
Engine Works, Paisley, Renfrewshire, Engineers and Shipbuilders, do hereby
declare the nature of this invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:-
This invention which relates to steam boilers of the type in which steam and
water drums are connected by a large number of water tubes situated over a
furnace or in a combustion chamber and it has mainly for its object by improved
arrangement and construction of the parts to provide for withdrawal and
replacing of any of the tubes which may leak or give way, without taking down or
removing the casing in which the heating surfaces of the boiler are enclosed.
In the accompanying drawings which illustrate the invention under several
modifications,
Figures 1 and 2, Sheet 1 represent in sectional end elevation and side elevation
a single ended boiler with one furnace.
This boiler is composed of a main drum or cylinder a partly filled with water,
the upper portion being steam space, two lower drums or cylinders b, b entirely
filled with water and two horizontal water tubes c, c. The lower drums b, b are
connected to the main drum by a large number of small water tubes d, d, d any
one of which may be withdrawn into the inside of the main drum a should it prove
defective and a new tube inserted through such drum.
Where height is not of importance the small tubes d, d, d may be longer and
more nearly straight than as shown in the drawings by increasing the distance
between the drums provided always that none of them are too long to be drawn
into the main drum. Access can be had to all the drums by manholes e, e, e
for expanding tubes in case of leakage or replacing them in case of defect.
The downflow of the colder water from the main drum takes place through
tubes fitted outside the furnace and smoke casing j, said tubes f, f being
connected to the horizontal water tubes c, c. The circuit is completed through
vertical tubes g, g, y connecting the horizontal water tubes to the lower
drums b, b. These vertical tubes 9 should be sufficient in number to give a
supply of water equal to that flowing through the small tubes d, d, d and are
so placed as to distribute the water to the drums b so as to ensure uniform
distribution of the water through the tubes d. This could not be accomplished
by connecting the downflow pipe direct to the lower drum.
The hot gases from the furnace h pass upward between the small water
tubes d, d, d which are so arranged as to intercept their passage as much as
possible and thence to the funnel or smoke stalk i.
Air for the furnace may be drawn or forced through spaces formed by a
double smoke casing in order to heat it before passing to furnace. Feed water
may also be passed through pipes in spaces k.
Figures 1 and 2 Sheet 2 represent in sectional end elevation and side
elevation a double ended boiler with two furnaces at each end with one main
drum u, three lower drums b, b, b and three water tubes c, c, c.
The circulation of the water takes place as in the boiler described with
reference to Sheet 1.
Figures 1 and 2 Sheet 3 represent a double ended boiler with two furnaces
at each end and with two main drums a, a, three lower drums b, b, band three
water tubes c c c the arrangements being otherwise as above described.

page_text: Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is :-
A water tube steam boiler constructed substantially as hereinbefore described
under several modifications with reference to the accompanying drawings.
Dated this 30th day of December 1892.
CRUIKSHANK & FAIRWEATHER,
62, St. Vincent Street, Glasgow,' Agents.