Improvements in Tubulous Boilers.
Year: 1893

page_text: Date of Application, 22nd Dec., 1893-Accepted, 27th Jan., 1894
COMPLETE DEUIFICATION.
Improvements in Tubulous Boilers.
I, ALFRED FERNANDEZ YARROWw, of 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 the construction of tubulous boilers in such a manner
that any one of the water tubes can be conveniently removed or replaced without.
interfering with the other tubes.
For this purpose I construct and arrange the boiler and its tubes as I shall
describe referring to the accompanying drawings.
According to the construction shewn in Fig. 1 I connect the low water space A
with the upper water and steam space B by tubes C so curved that they can be
drawn out into the space B as indicated by the dotted lines C³, and can be taken
out of B on removing the end cover D. In like manner a fresh tube can be
put in.
According to the construction shewn in Fig. 2 the tubes C are so curved that
any of them can be taken out or put in by one or other of a number of holes E
provided in the shell of the upper space B, which holes are closed by tight covers
or plugs when the boiler is at work. As shewn in Fig. 3 there may be a single
row of holes E the tubes being suitably curved more or less to admit of their
passage through these holes.
Instead of curving the tubes as in Figs. 2 and 3, straight tubes may be used as
shown in Fig. 4, the upper ends of the tubes being enlarged, so that the holes which
receive these ends admit of the tubes being sufficiently angled to allow them to pass
through the holes E as indicated by the dotted lines C¹.
As shewn in Fig. 5 the tubes may be reduced at their lower ends the holes for
which are so much larger than the reduced ends of the tubes that the tubes can be
angled sufficiently, as indicated at C³, to allow of their lower ends being inserted,
then to be brought into line with the holes above, after which the lower ends can
be expanded in their holes, or, as shewn in Fig. 6, the annular space between the
tube and the interior of the hole can be filled with a ferrule F.
In a similar way tubes reduced at their upper ends might be inserted or
withdrawn.
According to the construction shewn in Figs. 7 and 8 the tubes are made of
length less than the distance between the lower space A and the upper space B, so
that the one end can be inserted in the tube plate, and then the other end can be
screwed on to or into a piece G to make up the required length.
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 :-
1. The construction of tubulous boiler with the tubes so curved that they can be
introduced or withdrawn through the opened end of the water and steam space,
or through holes in its shell, substantially as described.
2. The construction of tubulous boiler with the tubes enlarged at the one end, or
reduced at the other, so that they can be introduced or withdrawn at an angle,
substantially as described.

page_text: 3. The construction of tubulous boiler with tubes so short as to admit of their
introduction or withdrawal, lengthening pieces being afterwards screwed into or
on to their ends, substantially as described.
Dated this 22nd day of December 1893.
ABEL & IMRAY,
Agents for the Applicant.