Improvements in or connected with Boiler Tubes, Steam Pipes and the like.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in or connected with Boiler Tubes, Steam Pipes and
the like.
THOMAS SCOTT, of 20, Hastings Road, Ealing, in the County of Middlesex, Naval
Engineer, do hereby declare the nature of this invention to be as follows: —
This invention relates more especially to the water tubes of steam boilers, and to
steam pipes, but it is also applicable to other vessels, pipes or channels containing
fluids, or through which fluids are passed or circulated for the purpose of being
heated or cooled or conveyed from one place to another; and the object of the
invention is to provide means whereby such tubes, pipes, channels or vessels can
be made much stronger than heretofore, and the heating or cooling surface thereof
largely increased.
The invention consists in arranging a number of comparatively small tubes in the
form of a sheaf or bundle and in filling the intermediate spaces between such tubes
with metal or other suitable substance which is a good conductor of heat. In some
cases the sheaf or bundle of tubes may be inserted into a case or tube of larger
diameter, and the space between the sheaf or bundle of tubes and the enclosing case
or tube be filled with the metal or other substance, as well as the spaces between
the separate tubes.
The spaces may be filled with the metal or other substance by any suitable
method, such as by casting, electro-deposit, and so forth according to the nature of
the filling material employed, and other circumstances.
The sheaves or bundles of tubes, prepared as above described, may be used as
water tubes for boilers, steam pipes, condenser tubes, and other analogous purposes
in any suitable way.
It will be readily understood that as the sum of the circumferences of a number
of comparatively small tubes is greater than the circumference of a single tube,
having the same across sectional area as the sum of the cross sectional areas of the
smaller tubes, the heating or cooling surface, as the case may be, is proportionally
greater and as the filling material surrounding the tubes is a good conductor of
heat the heating or cooling effect upon the liquid contained in, or passing through
the tubes will also be greater. It will also be understood that the arrangement
above described enables a number of tubes or pipes of comparatively small diameter
to be substituted for one tube or pipe of comparatively large diameter: and that
consequently much greater strength can be obtained for steam pipes and other
vessels or channels subjected to internal pressure than when a single pipe of large
liameter is used.
Dotad this 18th day of Tolm 190

page_text: Improvements in or connected with Boiler Tubes, Steam Pipes and
the like.
I, THOMAS SCOTT, of 20, Hastings Road, Ealing, in the County of Middlesex,
Naval 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 more especially to the water tubes of steam boilers, and to
steam pipes, but it is also applicable to other vessels, pipes or channels containing
fluids, or through which fluids are passed or circulated for the purpose of being
heated or cooled or conveyed from one place to another; and the object of the
invention is to provide means whereby such tubes, pipes, channels or vessels can be
made much stronger than heretofore, and the heating or cooling surface thereof
largely increased.
The invention consists in arranging a number of comparatively small tubes in the
form of a sheaf or bundle, and in filling the intermediate spaces between such tubes
with metal or other suitable substance which is a good conductor of heat. In some
cases the sheaf or bundle of tubes may be inserted into a case or tube of larger
diameter, and the space between the sheaf or bundle of tubes and the enclosing
case or tube be filled with the metal or other substance, as well as the spaces
between the separate tubes.
tube filled with
or
metal or
other
suitable
In the accompanying sheet of drawings Figure 1 is an end view of a number of
comparatively small tubes arranged in the form of a sheaf or bundle with the
spaces between them filled with metal or other suitable conducting substance in
accordance with the invention, and Figure 2 is a side view of the same. Figure 3
is an end view of a number of comparatively small tubes also arranged in the form
of a sheaf or bundle but enclosed in a case or tube of larger diameter, and the spaces
between the tubes composing the sheaf or bundle, and between them
and the enclosing case
conducting substance, and Figure 4 is a side view of same.
A, A, are the comparatively small tubes, which may be made of copper, iron or
other suitable metal. B is the filling material between and around the tubes A.
This material may be metal such as cast copper, cast iron, or any other suitable
material which is a good conductor of heat. It is indicated in Figures 1 and 3 by
cross hatching. C in Figures 3 and 4 is the enclosing case or tube, which may be
of copper, iron or other suitable material according to the purpose for which the
arrangement is to be employed. Both the above described arrangements form what
may be called compound tubes or pipes.
The spaces may be filled with the metal or other substance by any suitable
method, such as by casting, electro-deposit, and so forth according to the nature
of the filling material employed, and other circumstances.
The sheaves or bundles of tubes, prepared as above described, may be used as
water tubes for boilers, steam pipes, condenser tubes, and other analogous purposes
any suitable way.
in
In Figure 1 the material B filling the spaces between the tubes A and surround-
ing the said tubes externally is shown with a screw-thread D at one end suitable
for being screwed into an ordinary pipe socket, tee-piece, elbow, flange, or other
connection to enable the compound tube to be connected to other similarly prepared
compound tubes, or otherwise. The other end of the material B Figure 1 is shown
made into the form of a socket E which may be screwed internally to receive the
externally screwed end of another similar compound tube or other fitting, or the

page_text: said socket E may be expanded into the tube plate of a condenser or into the header
of a water tube boiler.
In Figure 4 the enclosing case or tube C is shown screwed at one end and
socketed at the other. It will be understood that the lengths of compound tube
may be screwed at both ends, or socketed at both ends, or be otherwise prepared
for connection to other parts.
When the compound tube or pipe is to be used for the conveyance of a fluid from
one place to another and it is desirable to prevent the escape of heat from, or its
transmission to the compound tube or pipe the above described filling material may
be limited to a certain length at the ends of the small tubes, the rest of the length
of the spaces being filled with non-conducting material. For example in the case
of a steam pipe the ends of the small tubes may be imbedded, for a short distance
in cast copper, iron, or other suitable material that will make a close joint with the
tubes and with the enclosing case or tube, when such is employed, so as to prevent
the escape of steam between the filling and the tubes or enclosing case, the rest
of the length of the spaces between the tubes or between them and the outer case
or tube being filled, or not, as may be preferred, with any suitable non-conducting
material to prevent the loss of heat by radiation or otherwise.
It will be readily understood that as the sum of the circumferences of a number
of comparatively small tubes is greater than the circumference of a single tube,
having the same cross sectional area as the sum of the cross sectional areas of the
smaller tubes, the heating or cooling surface, as the case may be, is proportionally
greater; and as the filling material surrounding the tubes is a good conductor of
heat the heating or cooling effect upon the fluid contained in, or passing through
the tubes will also be greater. It will also be understood that the arrangement
above described enables a number of tubes or pipes of comparatively small diameter
to be substituted for one tube or pipe of comparatively large diameter; and that
consequently much greater strength can be obtained for steam pipes and other
vessels or channels subjected to internal pressure than when a single pipe of large
diameter is used.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is:-
First. The construction of boiler tubes, steam pipes and the like by arranging a
number of comparatively small tubes in the form of a sheaf or bundle, and filling
the intermediate spaces between and around such tubes with metal or other suitable
material, substantially as described.
Second. The construction of boiler tubes, steam pipes and the like by arranging
a number of comparatively small tubes in the form of a sheaf or bundle within a
case or tube of larger diameter, and filling the intermediate spaces between the
inner tubes, and between them and the enclosing case or tube with metal or other
suitable material, substantially as described.
Third. The use of boiler tubes, steam pipes, and the like, constructed, sub-
stantially as described.
Dated this 18th day of November 1897.