Improvements in Means for Connecting the Tubes of Water-tube Steam Generators.
Year: 1898

page_text: Date of Application, 9th Feb., 1898 -Accepted, 4th Feb., 1899
COMPLETE SPECIFICATION.
Improvements in Means for Connecting the Tubes of Water-tube
Steam Generators.
We, HENRY BURNETT WATSON, Engineer, of High Bridge Works, City and
County of Newcastle-on-Tyne, and JoHN STANLEY WATSON, Engineer, High
Bridge Works, City and County of Newcastle-on-Tyne, 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:-
Our invention relates to the tubes of steam generators of the tubulous or
sectional type, and has for its object to render such generators simpler in con-
struction, more compact, and the jointing of the tubes more reliable than is at
present the case, while dispensing completely with cast metal.
Our invention is illustrated in the acompanying drawings in which
Figures 1 and 2 are respectively front elevation and end elevation partly in
section of tubes connected together according to the present invention.
Figure 3 is a sectional elevation of a modification in design, while
Figures 4 and 5 are sectional elevations of further modifications, and
Figures 6 and 7 are sectional elevations of the means employed for the
provision of handholes at the extremities of the tubes, and
Figures 8 and 9 are respectively longitudinal and transverse part section of
tubes connected together according to a further modification.
In carrying our invention into effect as illustrated in Figures 1 and 2 of the
drawings we provide adjacent tubes A and B enforced or thickened at their
extremities A¹ B or at the respective parts where connection is to be effected,.
and formed with flat surfaces A2 A3 B2 B3 in a plane transverse to the axis of
the bolt E by means of which the respective tubes are held together. The flat.
surface 12 of the tube B is drilled with a hole through which the bolt E is intro-
duced, the bolt being fixed in its position by means of a nut E¹ upon the inner
face, and is precluded from rotation. The surfaces A³ B3 respectively are bored
to form a conical seat for the reception of corresponding conical extremities of
a ferrule or tube 1 which serves the purpose of connecting together and com-
munication of the tubes; strips of nickel copper or other suitable metal or
material being introduced between the jointing surfaces so as to ensure a perfect
tight fit. Upon the flat surface A2, a hole is bored to. form a conical seat for
a corresponding conical shaped underface of a nut F which is screwed upon the
extremity of the bolt E. A strip of nickel copper or other suitable metal or
material being interposed between the opposing surfaces.
It will thus be seen that the single bolt E and nut F serve the purpose of..
maintaining the joints necessary for the connection of tubes together. The
extremities A¹ B¹ the tubes A and B may be closed with plugs I which may
be provided with handholes K as illustrated, thus affording means for examining
the interior of the boiler tubes without the necessity of unscrewing the plugs I.
The plugs I may however be solid.
Instead of employing a single bolt traversing the interior of the tubes for
effecting the connection we may effect the connection by such means as illustrated
in Figure 3 which represents saddles or external glands L formed of a configura-
tion corresponding to the extremities or parts A 131 of the respective tubes A
and B, such external glands or saddles being connected together by bolts L' L²

page_text: upon each side, the connection and shape of the tubes being otherwise as before
described and illustrated in Figure 1.
We may however dispense with independent means of connecting the tubes
together, employing the tube or ferrule D for the purpose as shown in Fig. 4.
We may provide the ferrule D with tapered screw threaded ends D₁ D¹ prefer-
ably differentially threaded so that the ferrule may be introduced and expanded
into the tubes and so rigidly connect the one tube to the other and at the same
time provide a good joint. We may however provide a plain ferrule D² threaded
throughout its length as shown in Fig. 5 formed with a shoulder O upon one
side against which it is caused to lie in close contact with the under flat
surface A of the tube A, while a check nut P may be provided for the same
purpose upon the face B3 of the tube B so that thereby good tight joints are
effected.
Figure 6 illustrates in section alternative means for closing the tubes and
consists of a plug or cap I' which is screwed on to the exterior of the tube, but
is otherwise similar to the means illustrated in Figure 1 for the same purpose.
Figure 7 illustrates a further similar modification in which the edge of the
tube is turned inwards to form an inwardly projecting circular flange A against
which the cap H may abut by the usual means.
Figures 8 and 9 illustrate a modification of the means illustrated in Figures 1
and 2 of the connection together of the tubes and differs therefrom in that the
extremities A 13 are not enforced or thickened and that the joint is effected by
means of a ring T of "T" shape or a ring U of "U" shape jointing material
being introduced between the faces in contact and the whole being tightened by
means of the bolt E and nut F.
22
It is obvious that the means hereinbefore described may be applied for the
connection together of two, three or more tubes and other modifications may be
made to suit the number or disposition of the tubes to be connected.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim is:-
1. In tubulous or sectional boilers means for effecting the connection of the
tubes consisting in combination of the formation of flat surfaces at the respective
parts where connection is effected, an intermediate ferrule or. tube, and a central
connecting bolt having a nut with a conical underface or the equivalent of such
a bolt and nut for the purpose and substantially as hereinbefore described.
2. In tubulous cr sectional boilers the means of connection of the tubes con-
sisting in combination of the thickening or enforcing of the tubes and the
formation of the tubes with flat surfaces at the respective parts where connection
is to be effected, an intermediate ferrule or tube and a central connecting bolt
and nut having a conical underface, or the equivalent of such bolt and nut for
the purpose and substantially as described.
3. In tubulous or sectional boilers means of connection of the tubes consisting
of an intermediate ferrule or tube substantially as described with reference to
Figures 4 or 5 of the accompanying drawings.
4. In tubulous or sectional boilers means of effecting the connection of the
tubes substantially as described with reference to Figures 1 and 2 and with refer-
ence to Figures 8 and 9 of the accompanying drawings.
D
LOGO
1000
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
13, Temple Street, Birmingham,
Agents.
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
13, Temple Street, Birmingham,
Agents.