Improvements in Tubular Boilers.
Year: 1893

page_text: Date of Application, 14th Mar., 1893
Complete Specification Left, 13th Dec., 1893-Accepted, 13:h Jan., 1894.
PROVISIONAL SPECIFICATION.
Improvements in Tubular Boilers.
I, JOSEPH FELL REDMAN, M.I.N.A., of Gallions, Royal Albert Dock, in the
County of Kent, Marine and Engineering Superintendent, do hereby declare the
nature of this invention to be as follows:-
According to this invention the exterior surfaces of the tubes are polygonal.
(preferably hexagonal) and the tubes are so set that the faces of each lie in the
same planes as the corresponding faces of the adjacent tubes.
The front ends of the tubes are turned down to a smaller diameter than the tube
leaving shoulders which abut against the inner face of the front tube plate and
they are secured by nuts on the outside or by being beaded over onto the outer
surface of the tube plate. The back ends of the tubes are also turned down and
are secured by ferrules to which they are fixed by screwing, shrinking or beading,.
or they may be expanded so as to fix them directly in the tube plate.
By this method of construction every part of the surface of the tubes and of
the front tube plate (which is that exposed to the greatest heat) can be thoroughly-
cleaned and examined.
Dated this 12th day of March 1893
J. FELL REDMAN..
COMPLETE SPECIFICATION.
Improvements in Tubular Boilers.
I, JOSEPH FELL REDMAN, M.I.N.A., of Gallions, Royal Albert Dock, in the
County of Kent, Marine and Engineering Superintendent, 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 :-
According to this invention the exterior surfaces of the tubes are polygonal.
(preferably hexagonal) and the tubes are so set that the faces of each lie in the
same planes as the corresponding faces of the adjacent tubes.
The front ends of the tubes are turned down to a smaller diameter than the tube.
leaving shoulders which abut against the inner face of the front tube plate and
they are secured by nuts on the outside or by being beaded over onto the outer-
surface of the tube plate. The back ends of the tubes are also turned down and
are secured by ferrules to which they are fixed by screwing, shrinking or beading,.
or they may be expanded so as to fix them directly in the tube plate.
By this method of construction every part of the surface of the tubes and of
the front tube plate (which is that exposed to the greatest heat) can be thoroughly
cleaned and examined.
DESCRIPTION of the DRAWINGS.
Figure 1 is a transverse section of four of the tubes showing the relative positions.
in which they are set in a boiler.
Figures 2 and 3 show two ways in which the tubes may be fixed.
The
a a are the tubes, 6 is the front tube plate and c the back tube plate.
portions of the tubes entering into the front tube plate are turned to a cylindrical
form and are secured in Figure 2 by nuts d and in Figure 3 by being beaded over
on the outside.

page_text: The other ends of the tubes are similarly turned down and are secured by
ferrules e, that in Figure 2 screwing onto the end of the tube whilst in Figure 3 the
tube is expanded into the ferrule or the ferrules may be dispensed with and the
tubes be expanded so as to fix them directly to the tube plate.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. Boilers in which the tubes are polygonal on the outside are so set that the
faces of each lie in the same planes as the corresponding faces of the adjacent
tubes.
2. Boilers such as are referred to in the preceding claim in which the ends of
the plane faces of the polygonal tubes abut against the front tube plate.
3. Boilers substantially as described and shown in the drawings.
Dated this 20th day of Nazamba 1002
J. FELL REDMAN.