Improvements in Steam Boilers.
Year: 1891

page_text: Date of Application, 5th May, 1891-Accepted, 6th June, 1891
CUMI DIE DIEUITIVATION.
Improvements in Steam Boilers.
I, EDWARD JEROME MOORE, of 45 North 7th Street, in the City of
Philadelphia, Pennsylvania, United States of America, Mechanical Engineer, do
hereby declare the nature of the said invention and in what manner the same
is to be performed to be particularly described and ascertained in and by the
following statement :-
The object of my invention is to dispense with the use of cast iron in the con-
struction of sectional steam boilers, and to provide for an even expansion of the
parts composing the boiler.
My improved boiler is especially adapted for marine service where strength and
lightness must be combined, the number of joints comparatively few, and the parts
easy of access for examination and repair. My boiler embodies all these features,
and at the same time it is of the sectional type making it exempt from destructive
explosions, and being made of steel or high grade iron, the ruptures usually found
in sectional cast boilers are entirely obviated.
I dispense with the additional stays generally used in cheap iron or steel boilers,
and so form the sections, that braces to a great extent are dispensed with. I also
construct the boiler that it can be readily transported in sections and built into a
vessel or set up therein by simply nippling the several parts together, as fully
described hereafter, reference being had to the accompanying drawings, in
which:-
Figure 1, is a longitudinal sectional view of my improved sectional steam
boiler.
Figure 2, is a transverse section on the line 1-2, Figure 1 ;
Figure 3, is a transverse section on the line 5-6, Figure 1;
Figure 4, is a perspective view of one of the coupling plates;
Figure 5, is an enlarged view of one of the sections of the front leg ;
Figure 6, is a detached perspective view of one of the sections of the front leg ;
Figure 7, is a sectional plan view on the line 3-4 Figure 1;
Figures 8 and 9 are views showing the cleaning hole covers;
Figures 10, 11, 12, and 13, are views of modifications of my invention; and
Figure 14, is an enlarged sectional view of one of the deflecting plates.
A, is the horizontal drum of the boiler mounted in the usual foundation B,
inclosing the fire chamber C, and combustion chamber C₁;- is the fire door
and b', the ash pit door; e the grate and c¹ the bridge wall; C2 is the smoke flue
and 2 is the man hole door, by which access can be had to the rear of the furnace ;
3 is the front cover plate, which when removed, exposes the front leg of the boiler,
and it is through this opening that the implements are inserted for cleaning the
tubes and plates.
Depending from the front portion of the horizontal drum A, is a leg D. This
leg is composed of a number of sections d, the upper section being secured in the
present instance to the coupling plate A', on the horizontal drum by the nipples e.
This coupling plate is struck up from a single sheet of steel to the proper shape
and flanged, as clearly shown in Figure 4, having a flat base in line with the upper
surface of the upper section of the leg D.
Each section d, is secured to the one directly below it by a series of nipples f
Figures 1 and 2, a space is left between the sections to allow for the insertion of
cleaner bars.
In order to allow for the free circulation of steam as it is formed in the boiler, I
make the nipples that secure the upper sections together larger in diameter than
the nipples securing the lower sections together, as shown clearly in Figure 1, in

page_text: which case the nipples gradually increase from the lower to the upper section. To
gain the increase of area, instead of increasing the diameters of the nipples, the
number of nipples may be increased. I preferably re-inforce. the sections by
plates a³ as clearly shown in Figures 10 and 11.
Depending from the rear end of the horizontal drum A, is the back leg E, having
a mud section E', at the base provided with an outlet e', by removing the cover of
this outlet, the mud can be withdrawn from the leg. This leg E, is connected to
the horizontal drum by a series of vertical tubes F, the tubes being expanded in
the crown of the vertical drum and into the sheet of the horizontal drum which is
expanded and formed in the manner shown in Figure 1, although a separate plate 1
may be secured to the drum and the tubes expanded into this plate, as shown in
connection with the front leg D.
Extending from the leg D, to the leg E, are a series of water tubes G, these
tubes are inclined as shown to allow them to drip into the mud section, and the
face of the back leg, as well as the face of the front leg is at right angles to the
line of the tubes. The back leg E, is semi-circular in cross section, as shown in
Figure 7, the front face of the drum being flat, so that the tube can be readily
expanded into the drum without elaborate fitting.
Deflecting plates i, are placed transversely in the furnace and direct the products
of combustion in a circuitous course through the combustion chamber. These plates
are made up of sections, which lap over each other and are rivetted together as
shown in Figure 14.
In the leg D, directly opposite each longitudinal tube is an opening h, through
which the tube cleaners can be passed when the plate 2 is removed. These
openings are closed by suitable caps ', of the peculiar form shown in Figures 8
and 9, and by so coupling the sections d, of the leg D, together as to leave a space
between the sections, the exterior surface of the tubes can also be cleaned.
The sections d, are made as shown in Figure 6, being struck up from sheet steel,
the header d, having the hand holes, and nippling holes, and the section d², having
the tube holes, the two headers are rivetted together as shown in Figures 1 and 5,
and I also tie the two headers together by stays k, of tubing, as shown in Figures 1
and 5, the tubes being of such diameter as to allow for the introduction of cleaning
bars into the interior of the furnace through these tubes and between the tubes G,
which are secured to the same section.
The feed water inlet tube a, extends from the front end of the horizontal
drum A, to a point directly above the opening into the vertical drum E, and the
steam pipe a¹ has a series of openings throughout a portion of its length.
It will be seen that by constructing a boiler as above, the circulation is complete,
the cooler water having a downward tendency in the back leg E, and as steam
forms in the tubes it passes through the tubes to the front leg and up into the
horizontal drum.
The upper section of the front leg D, of the boiler, may be secured to the
horizontal drum in the manner shown in Figure 10, the drum being expanded
the same as the portion of the drum Figure 1, which receives the coupling tubes of
the back leg, or the leg may be coupled to the drum, as shown in Figure 11, the
drum having a series of orifices a², and reinforced by a plate a³, and the upper
section D, may be cut away and the free end d³, bent up and flanged and rivetted
to the drum, or both the drum and upper section d, may be cut away and both
flanged, one flange fitting inside the other, and rivetted together as shown in
Figure 12.
Instead of the series of tubes F, connecting the drum E, to the drum A, a single
tube may be used, this tube being flanged and secured to the drum by rivets, thus
it will be seen by the construction, that the boiler can be transported in two or
more parts, and when applied to vessels, the tube section having the front and back
legs attached can be made up and fitted together and transported independently of
the horizontal drum A, which can be readily fitted to the tube section, after it has
been placed in position.

page_text: In some instances, the front leg D, and the back leg E, may be vertical instead
of inclined, as shown in Figure 1, or may be made, as shown in Figure 13, the
sides being inclined while the top and bottom plates are horizontal. The feed
pipe a, is firmly secured to a coupling head a³, Figure 1, which is secured to the
drum A.
By making the back leg E wide, as shown in Figure 3, and bunching the con-
necting tubes F, I form a space or passage x on each side of the tubes and between
the drum A and leg E, so that access may be had to the space above the
tubes G.
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. The combination in a steam boiler of the sectional type, a horizontal drum,
the front leg and a back leg, said back leg being semi-circular in cross-section and
connected to the drum by tubes, with water tubes extending from the front leg to
the back leg, said tubes being fitted into the flat portion of the back leg, substan-
tially as described.
2. The combination in a direct circulating water tube boiler, of the horizontal
drum, the sectional front leg made up of a series of horizontal sections_extending
from side to side across the boiler, nipples securing said sections together, a rear
leg formed of a single tube to which all the water tubes are connected, said leg
being fixed in the foundation of the boiler, and rigidly secured to the horizontal
drum, inclined water tubes connecting the horizontal sections of the front leg to the
single fixed tube forming the rear leg, the whole so arranged that the expansion
and contraction of the tubes will be taken up solely by the sectional front leg,
substantially as described.
3. The combination in a water tube boiler, of the front leg, the horizontal drum
and the rear drum, tube connecting the front leg and rear drum, the front leg being
made of a series of sections nippled together, the area of the nipples of the upper
section being greater than the area of the nipples of the lower section, substantially
as specified.
4. A rectangular attachment to an over head drum of a water-tube boiler formed
of one piece, having vertical straight ends, tube holes therein, and flanges turned
outward for a union with the upper water and steam drum, the underside of said
piece being bevelled at an angle to correspond with the rake of the inclined tubes,
and having a series of tube holes whereby the attachment is united to the headers
by means of nipples or tubes, as set forth.
5. The combination of the horizontal drum, the leg depending therefrom, a
coupling plate secured to said drum, nipples securing said coupling plate to the leg,
and right-angled tubes extending from the sides of the coupling plate to the upper
portion of the leg, substantially as described.
6. In a water tube boiler, the deflecting plates made in sections, having lips
overlapping each other, forming smooth upper and under surfaces, and bolted or
rivetted together and resting on the side walls of the furnace, substantially as
described.
7. The combination in a header section, of a water-tube boiler, the sheet metal
plate struck up in a single piece having the hand holes, and the nipples holes
therein, with a flanged plate having the tube holes, said plates secured together by
rivetting, substantially as set forth.
Dated this 5th day of May 1891.
DAY, DAVIES & HUNT,
321, High Holborn, London, W.C., Agents for the Applicant.