An Improved Water-tube Steam Boiler.
Year: 1898

page_text: An Improved Water-tube Steam Boiler.
I, JAMES MCDADE, of Herbert Street, Leyland, in the County of Lancaster,
Sheet Metal Worker, do hereby declare the nature of this invention to be as
follows:-
My invention relates to a novel construction of vertical water-tube steam
boiler. I provide an outer cylindrical shell and an inner conical shell so as to
The wide part of the inner
leave an annular space between the two shells.
conical shell is at the bottom and the narrow or contracted part at the top. The
inner shell is somewhat longer than the outer shell the extra length of the inner
a convenient arrangement for the
shell projecting at the bottom and providing
mounting or supporting of the improved boiler. The inner shell is attached to
the outer shell by means of angle rings at the lower end and at the upper end to
a plate or crown piece having a central opening. Screw bolts and nuts are so
employed that the two shells may be readily detached from or attached to each
other. The inner shell is provided with several rows of cross tubes arranged
horizontally and transversely or at different angles one above the other or they
may be slightly inclined to assist the circulation of the water. The ends of the
tubes are fitted to the inner conical shell in the usual or any convenient manner
the lowest row of tubes being so placed as to leave a suitable space for a furnace
or combustion chamber. The products of combustion resulting from the burning
of either oil coke coal or other material pass up through the conical inner shell
and impinge upon the several rows of cross tubes on the way. The water level
is arrange to be about two thirds of the height of the boiler and some of the upper-
most rows of tubes which do not contain water but only steam serve to dry the steam
and prevent priming. To still further promote the steam drying process I place
at the upper end of the boiler and over the central hole of the crown plate thereof
a steam dome or receiver in such manner that the hot gases or products of com-
bustion after leaving the boiler proper pass round or encompass the said dome
which communicates with the steam generated in the boiler and the steam
engine or motor through suitable pipes or tubes. The efficiency of my improved
boiler may also be increased by carrying a few turns of the feed water pipe in
the smoke box or uptake at the upper end of the boiler.

page_text: I, JAMES MCDADE, of Herbert Street, Leyland, in the County of Lancaster,
Sheet Metal Worker, 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 an improved construction of vertical water-tube steam
boiler as I shall now describe with reference to the accompanying drawings
wherein Fig. 1 shows the improved boiler in vertical section and Fig. 2 shows
it partly in plan with the smoke box or uptake removed and partly in horizontal
section on the line ax of Fig. 1.
1 is an outer cylindrical shell and 2 an inner conical shell arranged within the
outer shell so as to leave an annular steam and water space 3 between the two
shells, the wide part of the inner shell being at the bottom and the narrow or
contracted part at the top. The two shells are so constructed and arranged that
they can be readily connected together for use, and can afterwards be readily
detached from one another to allow of inspection or cleaning of the internal parts.
For this purpose the lower end of the inner shell may be connected to the lower
end of the outer shell by an angle ring 4 and bolts and nuts at 5, the flanged
upper end of the inner shell being connected by bolts and nuts 6 to a plate or
crown piece 7 that is suitably fixed to the upper part of the outer shell, consti-
tutes the top of the annular steam and water space 3, and is formed with a
central opening 8 corresponding to a similar opening through the top of the
inner shell. Instead of bolting the lower ends of the inner and outer shells
together, they may be rivetted together and the outer shell 1 be made as shown,
in two superimposed parts the adjacent ends of which are provided with angle
iron rings 9 connected together by bolts and nuts 10. The inner shell may, as
indicated in dotted lines in Fig. 1, be made somewhat longer than the outer shell,
the extra length of the inner shell projecting at the bottom and providing, a con-
venient arrangement for the mounting or supporting of the improved boiler over
a suitable fire grate or hearth. The inner shell may however be made of substan-
tially the same length as the outer shell, as shown in full lines in Fig. 1, and be
supported by a separate base piece or stand above a fire grate or hearth.
The inner shell 2 is provided with several rows of cross tubes 11 arranged hori-
zontally and transversely or at different angles one above the other, or they may
be slightly inclined, as shown, to assist the circulation of the water. The ends
of the tubes are fitted to the inner conical shell in the usual or any convenient
manner, the lowest row of tubes being placed at such a height as to leave a suit-
able space between them and the fire grate or hearth below to form a furnace or
combustion chamber. Flame and hot gases resulting from the burning of oil,
coke, coal or other combustible material pass up through the conical inner shell
and impinge upon the several rows of cross tubes 11 on the way. The water
level is arranged to be about two thirds of the height of the annular space 3 of
the boiler and some of the uppermost rows of tubes 11 which do not contain water
but only steam serve to dry the steam and prevent priming. To still further
promote the drying of the steam there is placed at the upper end of the boiler and
over the central opening in the crown plate 7 and top of the inner shell, a steam
dome or receiver 12 in such manner that the hot gases after leaving the boiler
proper pass round or encompass the said steam domě or receiver which communi-
cates with the top of the steam and water space 3 by tubes 13 and with the steam
engine or motor through another suitable pipe such as 14. The efficiency of my

page_text: improved boiler may also be increased by arranging a few turns of the feed water
pipe 15 in the smoke box or uptake 16 which is suitably secured to the upper
part of the boiler.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what
I claim is:-
1. A water tube boiler comprising inner and outer shells secured together one
within the other at top and bottom so as to form an annular space between them
and so that they can be readily detached the one from the other, the inner shell
being made conical and provided with several rows of cross tubes arranged hori-
zontally or slightly inclined and transversely or at different angles one above the
other, and having an outlet for hot gases at the top, substantially as described and
shown.
2. The improved water tube boiler constructed as hereinbefore described with
reference to and shown in the drawings annexed.
Dated this 26th day of January 1899.
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.