Improvements in Water Tube Boilers.
Year: 1894

page_text: Date of Application, 10th Oct., 1894-Accepted, 8th Dec., 1894
Improvements in Water Tube Boilers.
I, JAMES ARCHIBALD MCKIE, of Ernespie, Castle Douglas, in the Stewarty
of Kirkcudbright, North Britain, Marine 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 has for its object to so arrange the tube plates and doors of water.
tube boilers that by semi-circling same there is less waste of heat; to admit of a
simple, convenient and advantageous arrangement of the tubes; and in the
providing and arranging of a number of the tubes of a larger size through which
the stays pass, and in providing a hand-hole door between each stay whereby the
tubes may be examined.
In order that my invention may be properly understood and readily carried.
into effect have hereunto appended an explanatory sheet of drawings in both
figures of which corresponding parts are marked with the same letters of reference.
Figure 1 is a part elevation and part transverse section showing my improve-
ments; and
Figure 2 is a longitudinal section.
In carrying my invention into practice 1 connect the steam generator or boiler A
to the steam drum or receiver B by means of the chamber or passage C. formed
at each end of the boiler A. The inner walls of the passage C constitute the
tube plates D. These tube plates D are of a semi-circular or horse shoe form
and are so arranged that a large heating area is obtained, as well as providing a
convenient area for the fire grate or furnace. By virtue of such arrangement it
will be seen that the boiler A may be fired at either or both ends. The tubes E
pass from one end to the other of the tube plates D in an inclined manner and
are secured to the same with screwed ends or expanded with the usual rolled
joints, or by any other convenient means. To admit of free access to the tubes E
heavy doors or ends F are bolted or otherwise secured to the flange L and form
the outer wall of the chamber C, or one of the doors or ends F only may be
riveted to the flange L. These doors or ends are provided with small hand-holes
or doors G disposed around the semi-circle as shown to further facilitate the
access to the tubes E. The stays H of the boiler A pass from end to end of
tube plates D internally through large water tubes I and thence through the
heavy outer doors or ends F, thereby firmly binding the whole together, the said
large tubes I protecting the stays from the action of the fire and also affording
an increase of heating surface.
By my improvements in water tube boilers. as described it will be obvious that
four practical advantages are obtained, viz. (first) a large amount of heating surface;
(second) great evaporative power; (third) economy in fuel, and (fourth) the ease
with which the tubes may be cleaned, examined, stoppered or replaced as desired.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is :-
1. In a water tube boiler, the arrangement of the tube plates and tubes
substantially as and for the purpose herein before described and shown on the
accompanying drawings.
2. In a water tube boiler, having the stays passing through internal large tubes
substantially as and for the purpose hereinbefore described and shown on the

page_text: 3. In a water tube boiler providing the doors or ends leading to the tubes with
a band-hole door between each stay, substantially as and for the purpose herein-
before described and shown on the accompanying drawings.
4. The general arrangement and combination of the parts constituting my
improvements in water tube boilers substantially as and for the purposes herein-
before described and shown on the accompanying drawings.
Dated this 9th day of October 1894.
BOTTOMLEY & LIDDLE,
154, St. Vincent Street, Glasgow, Applicant's Agents.