Improvements in Water Tube Boilers.
Year: 1896

page_text: Date of Application, 29th Sept., 1896
Complete Specification Left, 28th June, 1897-Accepted, 31st July, 1897
PROVISIONAL SPECIFICATION.
Improvements in Water Tube Boilers.
I, JOSEPH CHARLES WILLIAM LLOYD, Mechanical Engineer of 21 Albert Road,
Eccles, near Manchester do hereby declare the nature of this invention to be as
follows:-
Referring to drawing, Figure I is an end sectional elevation of my improved boiler;
A is a cylindrical drum, B & C are nests of tubes closed at ends B & C, and connected
to draw at ends B, and C, and are fitted with internal circulating tubes, this being a
form of tube frequently used in boiler construction. Dare tubes connected to drum
at D, and to horizontal water pockets at D, the horizontal portion of tubes D forming
the firegrate, suitable air spaces being left between the tubes for the passage of air to
support combustion, the rising portion D, of firegrate tubes making an angle of about
30 degrees with vertical centre line of drum, each water pocket E & E, having a
connection to lower part of drum to act as downcomers, these connections are fitted
outside the furnace and are not shown in the drawing.
The boiler is surrounded by the casing F and may be fitted with water ash
pan G.
Figure II is an end sectional elevation of another form of my improved boiler,
the drumm A and the nests of tubes B & C being the same as in Figure I, but the
horizontal portions of water grate tubes are here extended round the nests of tubes
and connected to drum at D, and are jointed at D₁, in very small boilers this joint
may be dispensed with.
This construction of water tube grate may be advantageously used with other
forms of water tube boiler.
In both forms of boiler described, no two adjacent grate tubes have the rising
portion D, on the same side of boiler but are placed alternately right and left
as shown.
Dated this 26th day of September 1896.
[Improvements in Water Tube Boilers.
I JOSEPH CHARLES WILLIAM LLOYD (late of 21 Albert Road, Eccles), Mechanical
Engineer of 13 Green Lawn The Park Eccles Lancs., 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 :-
This invention relates to that class of water tube boiler in which the effective
heating surface consists almost entirely of relatively small diameter tubes, the

page_text: water being inside the tubes, and the exterior surface of the tubes being in contact
with the hot gases of combustion.
The object of my invention is to provide a boiler which is light and simple in
construction and which has a water tube grate, each water grate tube being
removeable without disturbing any other water grate tube or any other tube in the
boiler.
In the drawing (left with the Provisional Specification), Figure I is an end
sectional elevation of one form of my improved boiler, A is a horizontal cylindrical
drum, B. & C. are nests of tubes closed at ends B, & C₁, and connected to drum A at
ends B₂ & C, and are fitted with internal circulating tubes, this being a form of tube
frequently used in boiler construction, these tubes are preferably straight their axes
being inclined to the vertical at a suitable angle. E & E₁, are horizontal water pockets
to the ends of which are connected circulating pipes leading up to the under side of
the horizontal drum A & which are not shown in the figure.
D are tubes one end being connected to drum A at D₁, and the other end being
connected to water pockets E & E, at D, & form the essential feature of my
invention each of these tubes consists of a horizontal portion D forming the grate
and a portion D, inclined at a suitable angle to the horizontal, an angle of about 60°
being found convenient in practice, suitable spaces being left between the tubes to
facilitate removal of the same and for the passage of air to support combustion.
The boiler is surrounded by the casing F & may be fitted with water ash pan G.
as is usual in this class of boiler.
Figure II shows another form of my improved boiler, the drum A & nests of
tubes B & C. being the same as in Figure I, but the horizontal water pockets are
dispensed with and the horizontal portions of water grate tubes are extended round
the nests of tubes B & C and connected to drum A at D, & are jointed at D₁ to
facilitate removal, in very small boilers this joint may be dispensed with.
The sides of the grate shown in section in both figures are made portable to
facilitate removal of the grate tubes.
This construction of water grate tube may be advantageously used with other
forms of water tube boiler, and more particularly those consisting essentially of a
horizontal drum as at A and horizontal water pockets as at E & E₁, (Figure 1), with
nests of small tubes either straight and inclined or curved to various shapes but
connecting A with E & E₁, either with or without the external circulating tubes
referred to above.
It will be obvious that by employing the special form of water grate tube as
herein before described, ready facility is offered for removing and replacing any
individual water grate tube without disturbing any other tube.
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
In a water tube boiler the use and employment of a special forn of water grate
tube as and for the purposes herein before described and illustrated in the drawing.
Dated this 28th day of June 1897.
JOSEPH CHARLES WILLIAM LLOYD.