IMPROVEMENTS IN STEAM
Year: 1880

page_text: PROVISIONAL SPECIFICATION left by the said William Keable at the Office
of the Commissioners of Patents on the 23rd July 1880.
WILLIAM KEABLE, of Hull, in the County of York.
BOILERS."
"IMPROVEMENTS IN STEAM
My Invention is designed more particularly for steam boilers of the vertical type,
but is also applicable to locomotive and other boilers. It has for its object to
obtain increased heating surface and greater steam space, and effect a corresponding
economy in fuel.
The Invention consists in constructing the boiler with a hanging water space,
preferably of inverted cylindro-conical form, which is pendent centrally within the
fire box, and takes the place of the fire box crown, This water space occupies
nearly the whole transverse area of the fire box at the upper part, a narrow annular
space being left between it and the sides of the fire box, in which the products of
combustion rise and surround the central water space. This hanging water space
descends to within a short distance of the fire, and is traversed at the upper part by
a horizontal flue or flues, which communicate with the annular fire space at
opposite sides and with the usual chimney at the centre. A scum and blow off pipe
terminating in a rose descends to the bottom of this central water space, and passes
through the side of the boiler above the top of the fire box, where it is fitted with a
cock. By continuing the pipe downwards outside the boiler, it may be made to act
as a syphon for emptying the central water space when cold.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said William Keable in the Great Seal Patent Office on the 21st
January 1881.
WILLIAM KEABLE, of Hull, in the County of York.
BOILERS."
«
IMPROVEMENTS IN STEAM
My Invention is designed more particularly for steam boilers of the vertical type,
but is also applicable to locomotive and other boilers. It has for its object to obtain
increased heating surface and greater steam space, and effect a corresponding
economy in fuel.
°
The Invention consists in constructing the boiler with a cylindrical hanging
water space, preferably in the form of an inverted dome, which is pendent centrally
within the fire box and takes the place of the fire box crown.
This water space
occupies nearly the whole horizontal area of the fire box at the upper part, a narrow.
annular space being left between it and the sides of the fire box in which the
products of combustion rise and surround the hanging water space. This hanging
water space descends to within a short distance of the fire, and is traversed at the
upper part by a horizontal flue or flues, which communicate with the annular fire
space at opposite sides of the hanging water space and with the usual chimney at
the centre. A scum and blow off pipe, which may terminate in a rose, descends to
the bottom of this hanging water space, and passes through the side of the boiler
above the top of the fire box, where it is fitted with a cock. By continuing the
pipe downwards outside the boiler it may be made to act as a syphon for emptying
the central hanging water space when cold.
The advantages of this arrangement of hanging water space with cross flue are
that the main body of the water is brought into direct contact with the fire, the
heating, surface is increased, as compared with ordinary cross tube boilers, and the
water and steam spaces are also increased; there is less waste of heat, and fuel
is economised.
In the accompanying Drawings I have illustrated my Invention as applied to a
vertical boiler. In the case of a locomotive boiler the hanging water space is
similar, except that there is no cross flue.
Figure 1 is an elevation, and Figure 2 a vertical section of a vertical boiler. A is
the fire box, and B the inverted dome shaped crown forming a hanging water space
within the fire box. The sides of this hanging water space are cylindrical, and it
is from 2 to 12 inches (according to the size of the boiler) less in diameter than the
fire box, so as to leave an annular space C all around the water space B. The lower
end is preferably convex or spherical, as shown, but might also be conical, as may
be preferred. The sides of the hanging water space B may be flanged or splayed
outwards to meet the sides of the fire box A, which may either be straight or similarly
flanged or bent inwards to meet the side of the space B, the two being rivetted
together at a, or other, means may be adopted for maintaining the annular space C
and closing it at top; for instance, the sides of both the fire box A. and water space B
may be carried up straight and rivetted through a solid ring interposed between
them. D is a cross flue traversing the hanging water space near the upper part and
open to the annular space C at either end, and communicating with the uptake E
at the centre. There may be more than one of these cross flues at right angles, or
at any other angle, to one another, all communicating in the same way with the
annular space C and the central uptake E. F is a scum and blow off pipe passing
through the side of the boiler above the fire box, where it is fitted with a cock f
and carried down the interior of the water space B to near the bottom thereof. This
tube may have more than one inlet branch closed at the end and perforated at the
sides, or simply left open at the ends, as preferred. G is a tubular stay fixed across

page_text: the water space between the sides of the boiler and of the fire box A, opposite the
cross flue D, or each of them, to admit air thereto for assisting the consumption of
smoke, and to afford a ready means of cleaning out the flue.
Having described the nature of my Invention, and the manner of performing
the same, I declare that what I claim as my Invention to be protected by the
hereinbefore in part recited Letters Patent is,
1st. Constructing a steam boiler with a cylindrical or inverted dome shaped
water space pendant within the fire box and taking the place of the crown thereof,
substantially as shown and described.
2nd. Constructing the fire box of a steam boiler with a cylindrical hanging water
space provided with a cross flue or flues, communicating with the surrounding fire
space and with the uptake, substantially as and for the purpose described and shown
in the Drawings.
3rd. In combination with a hanging water space in the fire box of a steam
boiler a scum and blow off pipe, arranged substantially as and for the purpose
specified.
In witness whereof, I, the said William Keable, have hereunto set my hand
and seal, this Eighteenth day of January, in the year of our Lord One
thousand eight hundred and eighty-one.
WILLIAM KEABLE. (L.S.)