IMPROVE- MENTS IN STEAM & HOT WATER BOILERS
Year: 1884

page_text: I, GEORGE HERBERT LLOYD, of 11 Augustus Road Edgbaston Birmingham
Boiler Manufacturer do hereby declare the nature of my invention for IMPROVE-
MENTS IN STEAM & HOT WATER BOILERS to be as follows:-
This invention is for Improvements in Steam & Hotwater Boilers & relates
more especially to that class of Boilers known as Water Tube Boilers. A principal
object of this invention is to provide a more effective & convenient connection for
the ends of the tubes, than has hitherto been done.
Hitherto the end connections of the tubes of water tube boilers, have been,
either into flat water boxes, which from their form are weak & require staying, or
into tubular ends, which are expensive & for large sizes not convenient for
connection, or made by means of various descriptions of sockets or end pieces-
Now this invention provides a connection, which allows perfectly freo circulation
between any number of tubes and while readily and conveniently applied is
suitable for any size of tubes.
I attach the ends of the water tubes to a tube plate in any ordinary manner such
as by a screwed joint, by welding, by expanding end of tube, by flanging tube and
riveting or by flanging tube plate and riveting. Many tubes may be attached to
one tube plate or each end may have a separate tube plate & these separate tube
plates may be connected together subsequently if desired for convenience of
manufacture.
To these tube plates I attach a dished outside shell. A convenient method of
attachment is by riveting the flange of the dished outside shell to the flat tube plate.
By preference I dish these outside shells into a D shaped or half round section and
I allow the depth of the dish to be reduced at each end until it comes out altogether,
so that no end pieces are required.
I regard this method of providing end connections and the saving of the end
pieces of the end connections as important features of this invention. If annular
tubes are used the inside tube would be attached to the outside shell, probably in
the same manner as the outside tube is attached to the tube plate.
In boilers of small power where comparatively small tubes are used it might be
desirable to attach all the tubes to one tube plate and to form the outside shell
[Price Bd1
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page_text: also out of one plate & to have the dished connections stamped out of the plate in
vertical corrugations.
I prefer to make the boiler of a segmental character. Several tubes attached at
right angles one above another to a comparatively narrow tube plate and connection
at each end,
Thus the water tubes, the two tube plates & the two outside shells form one
segment. I prefer to set the boiler with the back end lower than the front to
assist the escape of steam and hot water towards the front end. The various
segments are connected at the top of the front to a cylindrical drum & at the
bottom to a mud collector.

page_text: I, GEORGE HERBERT LLOYD, of 11 Augustus Road, Edgbaston, Birmingham,
Boiler Manufacturer, do hereby declare the nature of my invention for "IMPROVE
MENTS IN STEAM AND HOT WATER BOILERS" and in what manner the same is to
bo performed to be particularly described and ascertained in and by the following
statement
This invention relates more particularly to boilers of the "water-tube" class; one
of its principal objects being to provide improved means for connecting the ends
of the beating tubes.
And in order that my invention and the mode of carrying the same into effect
may be fully understood, I will, with the aid of the accompanying drawings,
proceed to describe a steam generator constructed in accordance therewith.
Figure 1 is a front elevation of the said generator; Figure 2 a longitudinal
section thereof; Figure 3 a transverse section, and Figure 4 a plan view of the
same, the roof of the chamber enclosing the generator being omitted from the last
figure. Similar letters of reference indicate corresponding parts in all the figures.'
The main heating tubes a may be in one piece; or each may, if preferred,.be
formed in two lengths flanged or otherwise connected together as shewn at a²;
The extremities of the tubes a are mounted in tube-plates b b by means of flanges
formed on the tubes or on the tube-plates; the tubes being secured by rivetting, or
expanding their ends, or in any other known mode. Each pair of tube-plates
carries, by preference, soveral tubes; four being shewn in the present, illustration
as constituting a series. Each tube-plate may, for convenience of manufacture or
other reasons, be divided into parts, each attached to one of the tubes, these parts
being subsequently fitted and fastened together. In such a mode of construction, the
several parts of the tube-plate may be secured to the respective tubes by screwing.
To the exterior of each tube-plate is fitted a dished or hollow cover c; which, in
conjunction with the tube-plate, forms a passage serving to connect the extremities
of the several tubes together. Such a passage is shewn in cross section in Fig. 5.
The tubes being arranged one above the other, the passage extends upwards and
downwards. A series of tubes may however be divided into single elements or
groups of elements, each having separate terminal chambers; hollow connecting
pieces, such as commonly used, being employed between said terminal chamber*
for connecting such elements or groups into a series. At the back end of the
generator the passage or passages communicate with a water and mud drum d
below and with a steam and water drum e abovo. At the front end of the
generator, the passage or passages of like kind also communicate with the steam
drum e
The dished covers c are by preference of half round or D-shaped section, the
depth of the dishing being reduced at each end until it vanishes. By this means
no end pieces are required to close the passages formed by the hollow covers e;
economy in the cost of construction and inaintenance and neatness in appearance
being thereby effected.
Several series of these tubes a with their tube-plates b b and D-shaped covers cc,
such series or sections being constructed in either of the modes hereinbefore

page_text: described, may be grouped together side by side and connected to common steam
and water drums as shewn or in any convenient manner; the power of the
generator being thus adapted to the duty it is required to perform. In the present
illustration three such series or groups are shewn. These are for the greater part
or wholly enclosed within a brickwork or other suitable chamber, towards one end
of which is a furnace f. Midway of the chamber or thereabouts rises a wall g over
which the heated gases, after bathing portions of the heating tubes, pass. The said
gases then follow a downward course, bathing in their passage the remaining
portions of the heating tubes, and finally escape to the flue h. Where the heating
tubes are in double lengths jointed together, as in the present illustration, tho
wall g may be utilised for the protection of the intermediate joints from the fire.
In some instances, as shewn in Fig. 6, I transform the plain water-tubes a into
annular water-tubes by passing through cach tube a and through the dished
covers c c an internal or fire-tube a*. In such cases, the dished covers c c are
provided with stuffing-boxes or other suitably formed orifices for the reception of
-such fire-tubes; and the chamber-enelosing the generator is so adapted to the altered
conditions of working as to enable the gases,-after bathing the outer tubes, to-be
led to and conveyed through the inner tubes before escaping to the flue.
In boilers of moderate 'power and where comparatively small tubes are employed,
the several series of tubes may be secured to a common tube-plate at each end;
-and-the-several vertical passages, corresponding with the number of series of
heating tubes, may be stamped or otherwise formed in the same plate, which will
thus present several dish-shaped hollows instead of only one such depression.
Having-now-particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I am aware that
sectional boilers have been constructed with cast and with malleable metal terminal
chambers; also with compound water and fire-tubes, but what I claim is
First. In a sectional boiler, constructing each section of a series of water-tubes
arranged one above another and communicating at cach end with a passage or
chamber formed by the tube-plate in conjunction with a dished or D-shaped cover-
plate, the said dishing being formed wholly within the borders of the said cover-
plate, substantially as described.
Secondly. In a sectional boiler in which each section consists of a series of
water-tubes communicating at each end with a terminal passage common to them
all, providing each water-tube with an internal fire-tube or tubes.
Thirdly. In a compound water and fire-tube boiler, constructing each section in
the manner described in the first of the preceding claims, each water-tube as also
the dished cover-plates being however traversed by an inner or fire-tube, the
latter being mounted in and carried by the said cover-plates, substantially as
described.
Fourthly. In a compound water and fire-tubo boiler, constructing the chambers
terminating the water-tubes and carrying the fire-tubes in malleable inetal.
Fifthly. The modified construction of water-tubo boiler wherein several series of
vertical rows of water-tubes are secured in the same tube-plate and the vertical
passages corresponding with the number of rows of heating tubes are formed by
elongated dish-shaped cavities in the same cover plate, substantially as described.
Dated local .... ca. 100F