An Improvement in Tubulous Boilers.
Year: 1892

page_text: Date of Application, 22nd Oct., 1892
Complete Specification Left, 10th July, 1893-Accepted, 12th Aug., 1893
PROVISIONAL SPECIFICATION.
An Improvement in Tubulous Boilers.
I, ALFRED FERNANDEZ YARROW of the Isle of Dogs, Poplar in the County of
Middlesex, Engineer do hereby declare the nature of this invention to be as
follows:-
My invention relates to a construction of boilers having tubes traversed by water
and steam while they are surrounded by flame and products of combustion, the
chief objects which I have in view being to utilise the tubes as stays for the tube
plates and at the same time to provide for ready access to them for cleansing or
other purposes.
One convenient form of boiler according to my invention has at
each end a water space formed between two parallel tube plates. A number of
parallel tubes passing through the four plates present their open ends beyond the
outer plates, and are fixed, by expanding them or securing them in other known
ways, in such a manner that they stay together the plates through which they pass.
Every tube has an opening or several openings through its side in the parts of it
which are within the water spaces, and both ends of every tube are closed by
removeable plugs or covers. Over the boiler is provided a steam chamber or
several of these. The boiler thus constructed is placed in an inclined position over
a fire grate. The flames and hot products of combustion ascend through the
intervals between and around the tubes to a chimney above, heating the contents
of the tubes, and water, circulating through these and the end water spaces,
becomes heated generating steam which ascends to the steam chamber or chambers
above.
In order to prevent the flames and products of combustion from passing directly
to the chimney, I introduce baffle plates between some of the tubes so as to
direct the hot gases in a zig-zag course. Or, instead of employing baffle plates,
I make some of the tubes with projecting ribs or fins which occupy the space
between adjacent tubes and prevent passage of the gases between them.
Dated this 22nd day of October 1892.
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
An Improvement in Tubulous Boilers.
I, ALFRED FERNANDEZ YARROW, of the Isle of Dogs, Poplar, in the County
of Middlesex, 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 :-
My invention relates to a construction of boilers having tubes traversed by water
and steam while they are surrounded by flame and products of combustion, the
chief objects which I have in view being to utilise the tubes as stays for the tube
plates and at the same time to provide for ready access to them for cleansing or
other purposes. One convenient form of boiler according to my invention is
shewn in longitudinal section by Fig. 1 of the accompanying drawings. It has at
each end a water space formed between tube plates parallel or approximately so,
two of these A B at the front and two CD at the rear end. A number of parallel
tubes E a longitudinal section of one of which is shewn by Fig. 2 pass through the
four plates A B C D presenting their open ends beyond the outer plates A and D
and are fixed by expanding them or securing them in other known ways, in such a
[Di 27

page_text: manner that they stay together the plates through which they pass. Every tube
has an opening or several openings F through its upper and lower sides in the
parts of it which are within the water spaces, and both ends of every tube are
closed by removeable covers which may be simple screw plugs G or compound
plugs G with interposed packing, or other suitable stoppers. Over the boiler is
provided a steam chamber H or several of these. The boiler thus constructed is
placed in an inclined position over a fire grate K. The flames and hot products of
combustion ascend through the intervals between and around the tubes E to a
chimney L above, heating the contents of the tubes, and water circulating through
these and the end water spaces, becomes heated generating steam which ascends to
the steam chanıber or chambers above.
In order to prevent the flames and products of combustion from passing directly
to the chimney, baffle plates may be introduced between some of the tubes so as to
direct the hot gases in a zigzag course. Some of the tubes may have projecting
ribs or fins occupying the spaces between adjacent tubes and preventing passage of
the gases between them. Such tubes with vertical ribs meeting each other may be
used with advantage to constitute the outer rows forming, as it were, walls through
which the flames and hot gases cannot pass.
When such ribbed tubes are employed, portions of their length at each end are
made without ribs or have their ribs cut off; one of these ends is secured in the
tube plates at the one end of the boiler, and then the tube plates which constitute
the other end of the boiler are brought on to the other ends of the tubes, which are
then secured in them.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
In a tubulous boiler extending the tubes through water spaces at each end and
securing them in each pair of the plates enclosing these spaces, cach tube being
provided with lateral openings in the part of its length which is between each pair
of these plates, substantially as and for the purpose set forth.
Dated this 10th day of July 1893.
ABEL & IMRAY,
Agents for the Applicant.