Improvements in Water Tube Boilers.
Year: 1895

page_text: Date of Application, 20th Nov., 1895
Complete Specification Left, 12th Aug., 1896-Accepted, 12th Sept.,
1896
PROVISIONAL SPECIFICATION.
Improvements in Water Tube Boilers.
JOHN CHARLES RAYMOND OKES The Limes Brondesbury Park London N.W.
Engineer do hereby declare the nature of this invention to be as follows
--
The improvements consist in the production of a better circulation of water in
water tube boilers than has hitherto been obtained and they have reference more
especially to that class of boiler consisting of a vertical chamber or chambers with
horizontally inclined tubes, having closed ends, attached and fitted with internal
circulating tubes. Also the means whereby the same is effected.
For the circulation of water in boilers of this type it is usual to trust to the
difference of specific gravity of the water due to the varying temperature or what
may be termed natural circulation.
Where boilers are subjected to intense heat such as in the case of forced draught,
the variation of gravity is found not to be sufficient for the proper circulation, the
incoming stream of water passing through the internal tube becoming nearly of the
same temperature as that on the outside of it, especially when the feed water is
heated.
In my improved boilers, this is obviated by artificial circulation, the water being
compelled to circulate by its being forced through the internal tubes by mechanical
means.
This is effected by the vertical supply chamber to which the circulating tubes
are attached, being subjected to a pressure slightly greater than the rest of the
boiler the connections at the top with the other vertical tubes or steam evaporating
chamber being restricted-the circulating medium will force the water through
the internal tubes irrespective of the variations in specific gravity of the water.
By this system of working longer boiler tubes may be used & greater evaporating
surface obtained, thus increasing the power of the boiler and also the life of the
tubes.
The circulating power, whether by feed pumps, injectors, or otherwise may be
made to vary according to the requirements of the boiler.
Dated this Nineteenth der of November 1895
JOHN CHARLES RAYMOND OKES The Limes, Brondesbury Park, London N.W.
Engineer do hereby declare the nature of this invention and in what manuer
5 the same is to be performed, to be particularly described and ascertained in
and by the following statement :-
The improvements consist in the production of a better circulation of water in
water tube boilers than has hitherto been obtained and they have reference
more especially to that class of boiler consisting of a vertical chamber or chambers
[Price 8d.1

page_text: pockets extending upwards and opposite to those tubes most exposed to the action
of the fire.
The lower tiers of the internal tubes b. b. are attached to the pockets P P to
convey the water, forced in by the pump, to the lower ends of the generating
tubes B. B.
The vertical chambers A. A Fig. II are attached to the side of a hollow girder
or pipe C Fig. II upon which they rest, by suitable pipes D D, this hollow girder
or pipe being in direct communication with the circulating pump G Fig. I, the
water will be forced down the circulating tubes bb attached to the pockets and
will return through the annular space between them and the generating tubes B B
into the vertical chambers A A.
The circulating pump G draws its supply preferably from the steam drum F
through the pipe H Figs. I and II, the drum F being also connected with the
hollow girder C by external pipes J. J. These pipes may be controlled by the
sluices Oo in order that natural circulation may be employed when forced draught
is not required.
The feed water may be passed through the pockets P. P.
Those generating tubes B B above the pockets, where the heat is less intense,
will be partly supplied by the circulating water pumped through the lower
tubes B B, together with the feed, and partly in the ordinary manner by natural
circulation.
The generating tubes B B may be attached to the vertical chambers A A
by screwing them into bosses formed for their reception or other suitable means,
the internal supply pipes bb being screwed in a similar manner to the side of the
pocket in the chambers A A. or, where no pocket exists, they (bb) may be lengthened
and carried by the generating tubes as shown in the drawing Fig. IV or they may
be attached to plugs and screwed into the front of the vertical chambers as shewn
by Fig. III in which cases they are provided with slots or openings to allow of the
water passing through them. Where a cap or cover of sufficient size is used, Fig. IV
the generating tube may be coned into the vertical chamber A.
Each segment consisting of vertical chamber and generating and circulating
tubes is complete by itself and may be removed from the front of the boiler by
detaching it from the hollow girder C and the steam drum F at the pipes Ď
and E.
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:
I. In water tube boilers composed of vertical tubes or chambers with horizontally
inclined tubes, having closed ends, attached and fitted with internal circulating
tubes, the forced circulation of water.
11. In boilers as above described, the restriction of the flow of water, wholly or
partially, in the vertical chambers or tubes whereby the circulating water is made
to pass through the internal circulating tubes.
III. In boilers as above described, the vertical supply chamber or pocket
to which the circulating tubes are attached for the purposes described and set
forth.
IV. In boilers, as described and illustrated, the combination of forced and
natural circulation of water.
V. The general arrangement and construction of water tube boilers herein
described and illustrated and for the purposes set forth.
Dated this 12th day of August 1896.
JOHN C. R. OKES.