Year: 1897

page_text: Date of Application, 6th Nov., 1897-Accepted, 4th June, 1898
I, SYDNEY AGUSTUS HUGH NOEL, of "Brynteg," Penylan, Cardiff, in the County
of Glamorgan, 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 :-
This invention relates to an improvement in steam boilers, and relates principally
to that class of boiler wherein vertical tubes are suspended from the chamber above
the furnace, the flames passing around and about the suspended tubes.
My improvement consists principally in the form of tube employed.
In applying my invention to a boiler, I prefer making a flat or rectangular steam
and water chamber, lying horizontally above the furnace. The water occupying a
portion of the chamber above the crown of the furnace or bottom plate of the
boiler, and the steam of course the upper portion.
Through the top plate and also through the crown of the furnace, are made a
series of holes through which are inserted vertical hanging tubes with internal cir-
culating tubes, and it is with these tubes, that this invention has especial reference.
The hanging tube, is closed at the lower end, and the other end is screwed or has
brazed thereto, a screwed nipple, which is inserted into a tapped hole in the furnace
crown. This tube, with its nipple is passed through the outside plate through an
opening of sufficient size, so that the boiler can be tubed entirely from the top.
When the tube, with its screwed nipple is placed in position, a threaded cap is also
screwed on to the same nipple; this cap is made to carry the internal circulating
tube, the top part of the circulating tube being screwed into an aperture made to
receive it, and is open and communicates with a horizontal passage or opening in
the cap and through which the water descends passing first down through the cir-
culating tube, and then upwards by way of the annular space, between the tubes.
The top part of the cap is tapped, to receive the end of a short tube, up which
the steam ascends passing upwards through the cap, through passages formed
therein, escaping through holes in the top part of the tube, which is screwed
into the cap upon the furnace crown. A screwed nipple and cover are fixed to the
top part of the arrangement, and serve to secure the open end of the tube to
the outside shell of the boiler.
The tube with its fixings thus becomes a very effective stay between both of the
boiler plates.
When a series of these vertical tubes are attached to a boiler and hanging down
into the furnace, any convenient form of baffle plates may be employed to direct
the heated gases any number of times across the furnace as may be desired.
Figure 1 is a section through a tube with its attachments, A, is the outside shell
of the tube upon which the heated gases play, B, is the crown of the furnace and
C the top plate of the boiler, D is a nipple brazed or otherwise secured to the tube,
and screwed into an opening E in the furnace crown. F is a casting screwed on
to the nipple D, and to which is attached the inner or circulating pipe, G, which
conveys the water downwards from the water space in the boiler openings, being
formed in the casting to allow the water to pass into the tube G. I is a short tube
screwed at one end into the top part of the casting F, and at the other into a

page_text: nipple J which in its turn is screwed into a tapped hole in the top plate of the
boiler C, a cap K is screwed on to the nipple J and a steam-tight joint is formed at
L, so as to prevent steam escaping in this direction. M is a square or other device
formed
upon the cap K for the application of a spanner, or key.
N are
openings in the tube I for the escape of the steam into the boiler.
Figure 2 is a section of a portion of the tube through O and P showing a
passage way on either side of the circulating tube G. This allows the generated
steam to rise and pass away into the steam space of the boiler.
Figure 3 is a cross section through the casting F at R and S showing the water
passage H, and the steam passage Q.
Figure 4 is a plan of the cap K.
Figure 5 is a longitudinal section showing the general arrangement of these
tubes as applied to a boiler of the kind already described. A, being the tubes.
T, the furnace and U, the flues leading to the chimney. V, V being baffle plates
for directing the heat among the tubes.
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. The combination with a steam boiler, of a water tube having its lower end
closed and its upper end removably fixed in the crown of the furnace by means of
a screw threaded nipple, substantially as described and illustrated.
2. The combination with a steam boiler of an outer water tube removably fixed
to the crown of the furnace by means of a screw-threaded nipple to which is screwed
a double casting or cap perforated horizontally and an inner tube open at both ends
enclosed within the said outer tube and suspended vertically by the said cap just
beneath the said horizontal perforation therein, substantially as described and set
forth.
3. The method and means of securing water tubes in steam-boilers, consisting of
attaching a nipple on the top end of the outer tube and screwing it into the furnace
crown, and a double casting or cap perforated horizontally and having an internal
hole in which is fixed the inner tube, on to the said nipple, and a short perforated
tubular union piece to the said cap, and a nipple to the said union piece, which nipple
in turn is screwed or otherwise attached to the top plate of the boiler, substantially
as described and illustrated.
4. The combination with a steam-boiler jointly or severally of the water tubes
with nipples removably attached by their top ends to the crown of the furnace and
having their bottom ends closed, the double casting or cap, the inner circulating
tubes screwed therein, the horizontal water passage in the said cap communicating
with the said inner tubes, the perforated tube or union connecting the double
casting or cap, by means of a nipple with the top plate of the boiler and the steam-
tight cover therefor, all constructed substantially as and for the purposes herein
described and set forth.
Dated the fith day of Noramhan 1007