Improvements in or connected with Tubes for Tubular Boilers.
Year: 1892

page_text: Date of Application, 8th Jan., 1892
Complete Specification Left, 3rd Oct., 1892-Accepted, 12th Nov., 1892
PROVISIONAL SPECIFICATION.
Improvements in or connected with Tubes for Tubular Boilers.
I, WILLIAM EAVES of Atlas Steel and Iron Works, Sheffield in the County of
York Engineer do hereby declare the nature of my invention to be as follows:-
The object of my invention is to provide tubes, for tubular boilers, which are
more efficient than are tubes with internal ribs, or with retarders as hitherto
constructed, or arranged.
66
According to my invention I apply to tubes having internal ribs, corrugations, or
projections, (preferably longitudinal internal ribs such as are used in what are
known as serve tubes") a retarder or strip of spiral or other convenient shape
placed in the centre of the tube between the edges of the ribs, corrugations, or
projections, and with a diameter equal, or approximately equal, to the space
between the longitudinal edges of such ribs, corrugations, or projections, and by
this combination I obtain a very efficient breaking up of the column of hot gases
passing through the tubes and efficient contact of the said gases with the heat
absorbing surfaces and consequently a greater evaporative effect than hitherto,
whilst there is also absence, or diminution of accumulation of soot, ashes, coal, or
the like, which occurs in tubes provided with retarders as hitherto.
ሰ 1 1
1005
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, London, W.C., Agents.
COMPLETE SPECIFICATION.
Improvements in or connected with Tubes for Tubular Boilers.
I WILLIAM EAVES of Atlas Steel and Iron Works Sheffield in the County of
York 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 :-
The object of my invention is to provide tubes for tubular boilers which are
more efficient than are tubes with internal ribs or with retarders as hitherto
constructed or arranged.
66
According to my invention I apply to tubes having internal ribs corrugations or
projections (preferably longitudinal internal ribs such as are used in what are
known as serve tubes") a retarder or strip of spiral or other convenient shape
placed in the centre of the tube between the edges of the ribs corrugations or
projections and with a diameter equal or approximately equal to the space between
the longitudinal edges of such ribs corrugations or projections and by this com-
bination I obtain a very efficient breaking up of the column of hot gases passing
through the tubes and efficient contact of the said gases with the heat absorbing
surfaces and consequently a greater evaporative effect than hitherto whilst there is
also absence or diminution of accumulation of soot ashes coal or the like which
occurs in tubes provided with retarders as hitherto.
The accompanying drawing illustrates an arrangement according to my inven-
tion.
Figure 1 is a longitudinal section and Figure 2 a cross section of a tube provided
with an arrangement according to my invention.
Figure 3 is a separate view of the retarder.
A is a serve tube with internal ribs a.
B is a spiral strip which is inserted in

page_text: the said tube the width or diameter of the said strip being equal to the central
space in the tube between the edges of the ribs.
Although I have shewn a retarder of spiral form yet I do not limit myself to
that particular form nor do I limit myself to the form of ribs shewn in the tube as
the retarder may be of any shape which will act as described to break up or deflect
the column of gases passing through the tube and cause efficient contact of the said
gases with the heat absorbing surfaces presented by the tube and its ribs corruga-
tions or projections.
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 :-
A boiler tube having in its interior ribs corrugations or projections in combination
with a retarder situated in the space between the ribs corrugations or projections of
the tube substantially as and for the purposes hereinbefore described.
Dated this 3rd day of October 1892.
J. H. JOHNSON & Co.,
Agents.