Improvements in or relating to Flue Tubes for Multitubular Steam Generators.
Year: 1899

page_text: .Date of Application, 28th Dec., 1899
Complete Specification Left, 20th Oct., 1900-Accepted, 15th Dec., 1900
1
PROVISIONAL SPECIFICATION.
Improvements in or relating to Flue Tubes for Multitubular Steam
Generators.
I, ANDREW TAGGART, Jr., of 145, McClure Avenue, Allegheny, in the County
of Allegheny, and State of Pennsylvania, United States of America, Engineer,
do hereby declare the nature of this invention to be as follows:-
My invention relates to certain new and useful improvements in boiler-flue
tubes.
The object of my invention is to construct a flue tube of this character which
will be non-leakable, and which will not come in contact with the fire-box, thereby
giving the same greater durability.
Briefly described, my invention consists of a hollow tube secured in the flue-
sheet by means of a ferrule connected to said tube, said ferrule having an annular
groove on its periphery which receives a suitable piece of wire also arranged in
a groove formed in the opening of the flue-sheet, and a hollow plug forced or
pressed into the flue and formed with a shoulder at the outer end thereof for
securely holding the parts in position to prevent leakage.
1000
LI
ANDREW TAGGART, JR.,
Haseltine, Lake & Co.,
45. Southampton Buildings, London, W.C., Agents for the Applicant.
Improvements in or relating to Flue Tubes for Multitubular Steam
Generators.
I, ANDREW TAGGART, Junior, of 145, McClure Avenue, Allegheny, in the County
of Allegheny, and State of Pennsylvania, United States of America, 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 fol-
lowing statement:-
The object of my invention is to construct a flue tube of this character which
will be non-leakable.
A further object of my invention is to construct a flue tube of this character
which will not come into contact with the fire-box, thereby giving longevity to
the same.
Briefly described, my invention consists of a hollow flue tube which is secure
in the Hue-sheet by means of a ferrule which is connected thereto, having an

page_text: annular groove on its periphery which receives a suitable piece of wire, formed of
any metallic material, which wire also engages with the groove formed in the
opening of the flue-sheet, and a hollow plug forced or pressed into the flue tube
which is formed with a shoulder at the outer end thereof, securely holding the
parts in position to prevent leakage.
My invention finally consists in the novel combination and arrangement of parts
hereinafter more fully described and particularly pointed out in the claims.
In the drawings:-
Figure 1, is a longitudinal sectional view of my improved boiler-flue tube and
a portion of the flue-sheet.
Figure 2, is a longitudinal sectional view of my improved boiler flue tube with
the hollow plug removed.
Figure 3, is a longitudinal sectional view of a modified form.
Figure 4 is a perspective view of the hollow plug of the construction shown in
Figure 1.
Figure 5, is a perspective view of the modified form of said plug shown in
Figure 3.
Figure 6, is a perspective view of the ferrule.
Figure 7, is a perspective view of the locking-means.
Figure 8, is a perspective view of the locking means when extended.
Referring to the drawings by reference numerals, 1 indicates a flue tube which
is formed of a hollow cylindrical tube of the ordinary construction used in steam
boilers. This flue tube is adapted to receive on its ends the hollow sleeve or
ferrule 2. This sleeve or ferrule 2 may be secured to the flue tube in any desired
manner and is provided on its periphery at one end thereof with an annular
groove 3.
4 indicates a flue sheet which is provided with openings adapted to receive the
flue tube. The walls of these openings are provided with annular grooves which
registers with the annular groove 3, arranged on the periphery of the ferrule, and
is adapted to receive the fastening-wire 5, when the ferrule and flue tube are
placed within the opening in the flue sheet. This fastening-wire 5 is constructed
of any desirable material and may surround the ferrule entirely or partly, as may
be desired: When the ferrule 2 is secured to the flue tube, it projects over the
same, as shown in Figure 1 and 2 of the drawings, and this projecting end 6 is
hammered or forced against the flue-sheet, as shown.
7 indicates a hollow plug which is adapted to be forced within the flue tube as
shown, and is provided with an annular flange or shoulder 8, which abuts against
the projecting end 6 of the ferrule and secures the same in position. The hollow
plug is of slightly greater diameter than the inner face of the flue tube so that
when forced or pressed within the said flue tube, it will expand the same and
thoroughly secure the fastening-wire to the ferrule and flue-sheet to prevent the
dislodgment of the flue tube and to prevent leakage. The inner end of the hollow
plug is tapered as at 9. It will be observed that when in each end of the flue tube
is mounted one of these plugs the space betweeen such plugs being of larger
sectional area than the plugs themselves will form, as it were, a combustion
chamber or a continuation of the combustion chamber and a greater heating-
surface as well as a more intense heat will be secured.
In the modified form of construction shown in Figures 3 and 5, I dispense with
the ferrule and form the ends of the flue tube with an annular groove registering
with the annular groove in the flue-sheet, in which groove is mounted the fasten-
ing wire 5. The plug is then inserted and will securely hold the same in position
and prevent leakage owing to its expansion.
If desired in the openings in the flue-sheet and on the periphery of the ferrule
and flue tube more than one groove may be employed, in which a corresponding
number of fastening-wires are used.
If, 'desired, the flue sheet may be interiorly screw-threaded and the ferrule
formed with exterior screw-threads for securing the ferrule thereto. The hollow

page_text: plug may also be exteriorly screw-threaded and the flue provided with interior
screw-threads for securing the plug therein. The various parts may be secured
together in any manner desired.
It will be noted that various changes may be made in the details of construction
without departing from the general spirit of my invention.
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. A boiler-flue tube comprising a hollow cylindrical tube, a ferrule suitably
mounted thereon and projecting outwardly therefrom, said ferrule provided with
an annular groove, a flue-sheet provided with an opening adapted to receive the
said ferrule and flue tube, the walls of the said opening in the flue-sheet provided
with the annular groove registering with the groove formed in the ferrule, a
fastening-wire arranged in the said grooves, and means inserted in the said flue
tube for securing the ferrule and tube to the flue-sheet, substantially as described.
2. A boiler-flue tube comprising a hollow cylindrical tube, a ferrule mounted
thereon and projecting outwardly therefrom, said ferrule provided with an annular
groove, a flue-sheet provided with an opening adapted to receive the said ferrule
and flue tube, the walls of the said opening in the flue-sheet provided with an
annular groove registering with the groove formed in the ferrule, a fastening-wire
arranged in the said grooves, a hollow cap provided with an annular flange on
its outer end adapted to be inserted within the said flue tube, and have a flange
abut against the extending end of the ferrule for securing the flue tube and the
ferrule to the flue-sheet, substantially as described.
3. A boiler flue tube consisting of a hollow tube, a ferrule, an annular groove
formed on its periphery near the end thereof, a flue-sheet provided with an opening
having the walls thereof formed with an annular groove registering with the groove
formed on the ferrule, a fastening-wire mounted in the said grooves, and a
hollow plug provided with an annular flange in the periphery of its outer end, the
said plug being of greater diameter than the interior of the said flue tube adapted
to be inserted therein for extending the end of the tube and securing the same
and the ferrule to the flue-sheet, substantially as set forth.
3
1000
Dave Way
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.