Improvements in Steam Generator Furnaces.
Year: 1893

page_text: Date of Application, 28th Feb., 1893
Complete Specification Left, 16th Aug., 1893-Accepted, 16th Sept., 1893
PROVISIONAL SPECIFICATION.
Improvements in Steam Generator Furnaces.
I, ASPLAN BELDAM, of 77, Gracechurch Street, in the County of London,
Consulting Engineer and Naval Architect, do hereby declare the nature of this
invention to be as follows:-
This invention has reference to furnaces of steam generators of different types,
such as the Marine type, Lancashire and Cornish types, and other like or analogous
steam generators; and it has mainly for its object to provide furnaces which
shall be better able to withstand the high pressures now employed in steam
generators.
According to this invention, furnaces or flues or the sections of the furnace
or flue when made in more than one part are larger in diameter in the centre than
at the ends, or in the form of a cylindrical arch, longitudinally. To provide
further strength, furnaces or flues of this shape are provided with circumferential
corrugations, or ribs, or equivalent formations, or partly with corrugatious and
partly with ribs, and these formations may be of different kinds. As for instance,
the ribbed formation may consist of circumferential ribs with plain portions of the
arched cylinder between them; or, ribs with hollowed out portions between then
on the suspension principle, or on the arched principle with the ribs inside; or of
simple corrugations of regular or irregular formation; or of any combination of
these; and they may be arranged in parallel, or spirally or obliquely.
In some cases, the ends of the furnaces may be made one with a flange and the
other cylindrical, the back end preferably being provided with a flange; and this,
in some cases, is made smaller than the front end."
In a furnace or part of a furnace made as above described, the ribs, corrugations,
or arches, are all placed or formed on one large or main arch or curve and all are
bridged, borne up, or supported, by the said curve or arch running longitudinally
of the furnace or flue.
or
and
In manufacturing furnaces or flues, I may arch up the curve, having a continuity
of metal for the whole length thereof, some parts can be thickened whether
the furnace be plain, ribbed, or corrugated, or formed in small arches, the whole
flue or furnace in any case assuming one cylindrical arch or curve extending from
one end to the other, or mainly so.
In some cases, the peripheral or circumferential corrugations, ribs, arches, or the
like, may be provided only at one part, or in separate parts; whilst according to a
modification, the furnace or flue may be made in two parts and connected by
an Adamson's joint in the centre, at the largest part of the longitudinal arch
or curve.
Accordingly as the furnaces or fire boxes are to be flanged, at one, or both ends,
or made of plain cylindrical form, so they will be of different form at these parts,
that is at the ends. When Adamson's joint is used in the centre, or at the ends, or
both the lowest parts of metal may be kept level, or in some cases those parts
furthest away from the fire, can be raised, so that the action of the fire thereon will
be less intense. Also the central strengthening Adamson's joint or rings may,
in some cases, be so arranged and constructed, that its outside flange is no larger
than the mouth of the furnace and can be readily removed or replaced.
The constructions or formations of steam generator furnaces, flues, or fire boxes

page_text: may be used separately or conjointly, and arranged or used in any desired
combination, and therefore the invention is not strictly confined to the combinations
or arrangements more particularly specified above.
Dated this 27th day of February 1893.
CHEESBROUGH & ROYSTON, Fels. Chart. Inst P.A.,
15, Water Street, Liverpool, Applicant's Patent Agents.
COMPLETE SPECIFICATION.
Improvements in Steam Generator Furnaces.
I, ASPLAN BELDAM, of 77, Gracechurch Street, in the County of London,
Consulting Engineer and Naval Architect, 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 has reference to furnaces of steam generators of different types,
such as the Marine type, Lancashire and Cornish types, and other like or analogous
steam generators; and it has mainly for its object to provide furnaces which
shall be better able to withstand the high pressure now employed in steam
generators
According to this invention, furnaces or flues, or the sections of the furnace or
flue when made in more than one part, are larger in diameter in the centre than at
the ends, or in the form of a cylindrical arch, longitudinally. They may be made
plain throughout, or, to provide further strength, furnaces or flues of this shape are
provided with circumferential corrugations, or ribs, or equivalent formations, or
partly with corrugations and partly with ribs, and these formations may be of
different kinds. As for instance, the ribbed formation may consist of circumferential
ribs with plain portions of the arched cylinder between them; or, ribs with
hollowed out portions between them on the suspension principle, or on the arched
principle with the ribs inside; or of simple corrugations of regular or irregular
formation; or of any combination of these; and they may be arranged in parallel,
or spirally, or obliquely.
In some cases, the ends of the furnaces may be made, one with a flange and the
other cylindrical, the back end preferably being provided with a flange; and this,
in some cases, is made smaller than the front end.
In a furnace or part of a furnace made as above described, the ribs, corrugations,
or arches, are all placed or formed on one large or main arch or curse, and all are
bridged, borne up, or supported, by the said curve or arch ruuning longitudinally
with the furnace or flue.
ог
In manufacturing furnaces or flues, I may arch up the curve, having a continuity
of metal for the whole length thereof, and some parts can be thickened whether
the furnace be plain, ribbed, or corrugated, or formed in small arches, the whole
flue or furnace in any one case assuming one cylindrical arch or curve extending
from one end to the other, or mainly so.
In some cases, the peripheral or circumferential corrugations, ribs, arches, or
the like, may be provided only at one part, or in separate parts, whilst according
to a modification, the furnace or flue may be made in two parts and connected by
an Adamson's joint in the centre, as the largest parts of the longitudinal arch or
curve, or the Adamson's joint may be placed towards either end, say towards the
front end, preferably.
Accordingly as the furnaces or fire boxes are to be flanged, at one, or both ends, or
made of plain cylindrical form, so they will be of different form at these parts, that
is at the ends. When Adamson's joint is used in the centre, or at the ends, or both,
the lowest parts of metal may be kept level, or in some cases those parts furthest
away from the front can be raised, so that the action of the fire thereon will be less

page_text: intense. Also the central strengthening Adamson's joint or rings may, in some
cases, be so arranged and constructed, that its outside flange is no larger than the
mouth of the furnace and can be readily removed or replaced.
In the drawings which serve to illustrate this invention,
Figure 1 is a plain barrel shaped furnace according to this invention, shewing
same in longitudinal section.
Figures 2, 3, 4, 5, 6, 7, 8, 9, are sectional elevations of the upper side of furnaces
shewing my invention constructed or modified in different manners
referred to.
as above
The construction in Figure 2 consists in providing the longitudinal curvature
with circumferential corrugations or ribs a, the parts between said ribs forming a
true portion of the longitudinal curve on which the furnace is set. In this case the
front end is parallel whilst the back end is flanged outwardly as shewn. This is,
however, not essential, as according to the nature of the steam generator to which
it is to be applied, so will be the particular form or construction of the front and
back edges of the furnaces.
Figure 3 shews a modification wherein in the longitudinal curvature circum-
ferential corrugations are provided. In this case these corrugations or
circumferential formations are of the suspension principle and consist of the
ribbed part a and concave parts c with a centre portion consisting of a true part
of the main longitudinal curve of the furnace.
In Figure 4 the suspension principle referred to with reference to Figure 3 is
employed also in this case, that is to say the circumferential ribs a are employed,
the metal between said ribs being in the form of suspended circumferential parts.
The general longitudinal curve in this case is carried through, or the tips of the
ribs a lie in the same.
In Figure 5 the same principle of construction as set forth with reference to Figure +
is maintained as is set forth with reference to and shewn in Figure +, except that
the ribs are disposed closer together. In this, as in all cases, it will be seen that
the metal at each end is worked up at the back end into the flange (ƒ).
In Figure 6 the furnace is provided with a circumferential recess c at the front
end where the fire comes, and with another recess towards the other end, whilst
the longitudinal curve touches the furnace at a point between said depressions and
at the back end.
In Figure 7 a similar construction is provided as in Figure 6, but the second
circumferential depression is absent.
In Figure 8 the longitudinal curvature somewhat of the form shewn in Figure 7
is given, but in conjunction with this the furnace is provided with superimposed
circumferential corrugations.
Figure 9 shews a modification wherein only the central portion of the barrel
shaped or longitudinally arched furnace is provided with corrugated portions a c.
In Figure 10, the furnace is constructed at both ends alike, that is each end is
provided with a parallel part. In this case the central portion of the furnace is
larger in diameter than its parallel ends.
"
Figure 11 shews an arrangement in which the furnace is divided at the centre
and joined by an "Adamson's ring joint, and this figure also shews two of such
furnaces or parts of a furnace having the longitudinal curvature joined together by
an Adamson's ring joint. In the first instance the central joint ring is designated h.
In the second case, the ring is designated i. It will be seen that the barrel or
longitudinal arch shape exists also in this construction, but that at the centre there
are circumferential recesses c and outwardly turned flanges f¹. Of these the recess
nearest the front end is deeper than the other, the effect of which is that the flames
or gases of combustion are shielded somewhat by the front recess, and it does
not become injured by burning or like effect. Also this arrangement or construction
is carried out in connection with the joint of the two furnaces shewn, where the
flanges fe are joined together; that is to say the rounded corner cat the back
end of the first part is lower than the front bend or corner c³ of the next part as

page_text: shewn in the drawing, whereby also this corner or edge c* is protected from fierce
impact and injury from the flames of the furnace.
It is to be understood that the parts or constructions shewn in the different
modifications may be used singly as a whole furnace as those shewn in
Figures 2, 3, 4, 5, 6, 7, 8, 9, and 10, are, or two or more may be coupled
together in a furnace as in the case of the application to furnaces of Lancashire
and Cornish type and analogous cases, the edges being suitably flanged or formed
to enable them to be coupled by any known suitable form of joint.
By the construction herein set forth and shewn, I provide in addition to the
strength afforded by the cylindrical form that afforded by the circular longitudinal
arch formation, and these together provide a strength greatly in excess of any
furnace of a like kind heretofore in use.
The constructions or formations of steam generator furnaces, flues, or fire boxes
may be used separately or conjointly, and arranged or used in any desired
combination, and therefore the invention is not strictly confined to the combinations
or arrangements more particularly specified above.
Having now particularly described and ascertained the nature of this inven
tion and in what manner the same is to be performed I declare that what I
claim is :-
:-
1. A steam generator furnace consisting of a cylindrical and longitudinally
arched or curved (or barrel shaped) body with flanges at each end whereby it is
connected to the plates of the steam generator or another furnace; substantially as
herein set forth.
2. A steam generator or other furnace consisting of a cylindrical and
longitudinally arched or curved (or barrel shaped) body with superimposed
peripheral or circumferential corrugations or ribs or equivalent formations or
constructions; substantially as set forth and as illustrated in the drawings hereto
annexed.
Dated this 15th day of August 1902
CHEESBROUGH & ROYSTON, Fels. Chart. Inst. P.A.,
15, Water Street, Liverpool, Applicant's Patent Agents.