Year: 1899

page_text: I, ALFRED JOHN LIVERSEDGE, of 109, Victoria Street, Westminster, in the
County of London, Engineer, do hereby declare the nature of this invention to
be as follows:-
My improvements relate to steam generators in which the internal flues are
constructed partly or entirely of corrugated rings or tubes, and has for its chief
object to promote a better circulation of the water and to provide a greater heat-
ing surface than have hitherto been obtained in generators of this kind.
Heretofore considerable difficulty has been experienced in connection with
corrugated flues on account of their not lending themselves readily to the insertion
of cross tubes of the well known Galloway type or of other forms and various
attempts have been made to overcome this difficulty. For instance cross tubes
having flanges corrugated to correspond to the corrugations of the flues, have
been proposed; and in other cases the flues have been made with corrugated and
plain sections alternating with each other, and the cross tubes have been inserted
only in the plain sections of the tubes in the ordinary way by riveting or welding.
According to my invention I use tubes of comparatively small diameter and
insert them directly in the corrugated flues, by expanding their ends as now
generally practised in the construction of water-tube steam generators. I may
locate the cross tubes either in the crowns or in the hollows of the corrugations,
in which cases the cross tubes will be radially or otherwise disposed in planes
approximately at right angles to the axis of the flues. Preferably however I fit
the cross tubes in the inclined portions of the corrugations so that they occupy
inclined positions relatively to the axis of the flue, the inclination being prefer-
ably such that their upper ends are nearer to the furnace end of the generator,
than are their lower ends.
Some of the tubes, especially those adjacent to the furnace, may be prolonged
at their lower ends by means of separate tubes fitted to them and carried beneath
the furnace toward the front of the steam generator so as to assist in promoting
an effectual circulation of the water at this part. These lengthening pieces may
have open ends or closed ends with perforations distributed as may be considered
advisable.
I do not confine myself to the use of straight cross tubes as they may be curved
more or less to suit different positions in the flue. Nor do I confine myself to
the use of tubes expanded into the flue at both ends, as I may use tubes expanded
into the flue only at one end, the opposite end being closed: and in tubes so
constructed I may insert internal circulating tubes on the well known "Field"

page_text: system. Neither do I confine myself to the use of the aforesaid tubes in steam
generators of the Cornish or Lancashire types, as I may use them in vertical and
other types of steam generators.
Dolad this 5th day of Va... 1899
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.
I, ALFRED JOHN LIVERSEDGE, formerly of 109, Victoria Street, Westminster,
but now of Clock House, Arundel Street, Strand, in the County of London,
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:-
My invention relates to steam generators in which the internal flues are con-
structed partly or entirely of corrugated rings or tubes, and has for its chief
object to promote a better circulation of the water and to provide a greater
heating-surface than have hitherto been obtained in steam generators of this kind.
Heretofore considerable difficulty has been experienced in connection with
corrugated flues on account of their not lending themselves readily to the inser-
tion of cross-tubes of the well-known Galloway type or of other forms, and
various attempts have been made to overcome this difficulty. For instance cross-
tubes having flanges corrugated to correspond to the corrugations of the flues
have been proposed; and in other cases the flues have been made with corrugated
and plain sections alternating with each other, and the cross-tubes have been
inserted in only the plain sections of the flues in the ordinary way by rivetting
or welding.
According to my invention I use tubes of comparatively small diameter and
insert them directly in the corrugated flues, by expanding their ends as now
generally practised in the construction of water-tube steam-generators, I may
locate the cross tubes either in the crowns or in the hollows of the corrugations,
in which cases the cross tubes would be radially or otherwise disposed in planes
approximately at right angles to the axis of the flues. Preferably however I fit
the cross-tubes in the inclined portions of the corrugations so that they occupy
inclined positions relatively to the axis of the flue, the inclination being preferably
such that their upper ends are nearer to the furnace end of the generator, than
are their lower ends.
In order that my said invention may be clearly understood and readily carried
into effect I will proceed to describe the same more fully with reference to the
accompanying drawings, in which:
Figure 1 is a longitudinal section of a Cornish boiler having a corrugated
furnace and flue provided with water circulating tubes in accordance with my
invention.
Figure 2 is a vertical section taken on the line A B of Figure 1.
Figures 3 and 4 are cross-sections through the flue taken approximately on the
lines CD, and E F of Figure 1 and drawn on a larger scale.
a is the shell of the steam generator, b the corrugated furnace and flue and c
the fire-grate all of which parts are of ordinary construction. de and f are the
water circulating tubes located in the sides or inclined portions 6 of the corruga-
tions of the corrugated flue. These tubes are thus caused to be inclined to the

page_text: longitudinal axis of the flue as shown at Figure 1, which is the preferred arrange-
ment, although as already stated I may in some cases find it advantageous to
dispose the said water tubes in the crowns or hollows of the corrugations so as
to be at right angles to the axis of the flue. The inclination of the tubes de f
when they are arranged in the sides of the corrugations as illustrated, is such
that their upper ends de¹ and f' are respectively nearer to the furnace than are
their lower ends, thus increasing the heating capacity of the furnace by causing
the flames to impinge on these tubes and more effectually envelope them. The
tubes e are formed with a bend e in the interior of the flue and their lower ends
are prolonged by means of tubes e leading close to the front end of the steam
generator, for the purpose of assisting in the promotion of an effectual circula-
tion of the water. I have shown these lengthening pieces with open ends e³ but I
may equally well close such ends and perforate the adjacent walls.
For
The said tubes def need not be connected to the flue at both ends.
instance the tubes f are connected to the flue only at their upper ends, the opposite
ends being closed. When the tubes are arranged in this manner I may insert
into them, internal circulating tubes on the well known "Field" system."
I do not confine myself to the use of straight tubes as they may be curved
more or less to suit different positions in the flue. In Figures 2, 3 and 4 I have
illustrated several ways in which the form and arrangement of the tubes may be
varied. Obviously it may not be desirable in every case to fit the flue or flues
of any one steam generator with all the different arrangements of water circulating
tubes shown in the drawing. The various arrangements shewn serve merely to
indicate some of the modifications of which my system admits, without departing
from the nature of this invention.
Although I have shown my improvements applied to a steam generator of the
Cornish type, it will be readily understood that these improvements can be
similarly applied to other kinds of steam generators, such as the Lancashire and
vertical types for example.
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 in connection with steam generators is :-
--
1. Water circulating tubes inserted directly in the corrugated flue by expanding
one or both of their ends in the crowns hollows or inclined portions of the corru-
gations of the flue substantially as and for the purpose specified.
2. The combination of the aforesaid water circulating tubes with the corrugated
flue substantially as described with reference to any or all of the examples
illustrated in the accompanying drawings for the purpose specified.
Dated this 24th day of March 1900.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.