Improvements in Marine Boilers.
Year: 1896

page_text: Date of Application, 19th Mar, 1890
Complete Specification Left, 18th Dec.. 1896-Accepted. 19th Mar.. 1897
Complete Specification Left, 18th Dec.. 1896-Accepted. 19th Mar.. 1897
PROVISIONAL SPECIFICATION.
Improvements in Marine Boilers.
I, NABOR SOLIANI of. Brescello (Emilia) in the Kingdom of Italy, do hereby
declare the nature of this invention to be as follows:-
:
This invention relates to marine boilers of the cylindrical type and has for its
object to improve such boilers whereby they may possess the advantages of water
tube boilers in addition to their own good features.
According to my invention I provide marine cylindrical boilers with water tubes
and to this end I dispense with the water spaces around the ordinary combustion
chambers and substitute for them water tubes, some of which are arranged as a
protecting screen in front of the tubes and tube plates.
In applying my invention to single ended cylindrical boilers the after part
containing the combustion chambers and water spaces and the portion of the steam
chamber above the same is dispensed with and the tube plate is extended to form
the back end of the boiler shell.
A row of bent water tubes is arranged so as to extend from a large transverse
horizontal water pipe connected to the bottom space of the boiler, up to the water
level, or steam chamber, above the fire tubes so as to replace the back and sides of
the combustion chamber or chambers which are dispensed with as above described.
These tubes are arranged close to one another in such a manner as to form a
continuous wall or walls of water tubes enclosing the said combustion chamber or
chambers.
A similar row or rows of water tubes, bent in a curve similar to a letter C is or
are fitted vertically and parallel to one another, in front of the fire tubes so as to
extend from points below the lower row of fire tubes just above the furnaces and
up to the water level or steam chamber, above the upper row of fire tubes, the said
water tubes being properly spaced so as to leave the necessary passage for the
flames and hot products of combustion, whilst absorbing a sufficient portion of
their heat to prevent overheating of the fire tubes and of the tube plate.
A space is left between this second row or rows of water tubes and tube plates
the said space being accessible from the sides of the boiler for visiting, repairing
and refitting the fire tubes.
Doors with regulating dampers are fitted at the rear end of the ash pits for,
admitting air underneath the fire grates from the rear end of the boiler for the
purpose of improving the combustion.
In applying my invention to a double ended marine cylindrical boiler the central
part containing the combustion chambers and the water spaces and the portion of
the steam chamber above the same is dispensed with and the tube plates which are
extended to form the back ends of the shells of two single ended boilers are
deprived of their combustion chambers and arranged back to back with a space
between them.
Two rows of water tubes, bent like a letter S, are arranged vertically and
parallel and crossing each other, and extend from points underneath the lower row
of fire tubes, just above the furnaces of one boiler, up to the water level or steam
chamber of the other boiler, in such a way as to form a ceiling to replace that of
the combustion chambers and a screen of water tubes in front of the tube plate, to-
protect the plate and fire tubes.
نا

page_text: Another row of water tubes, bent in the form of a letter C, may be added in
front of the tube plates, if necessary, to protect the tubes and tube plates more
efficiently from the damage arising from forced combustion.
Two large water passage tubes connect at the sides the lower part of the water
chambers of both boilers and from each of them a close row of water tubes extends
up to the steam chamber and takes the place of the sides of the combustion
chambers which are dispensed with as above described, open spaces being left for
proper access to the fire tubes for visiting, repairing and refitting them when
necessary. The large water passage tubes above mentioned will promote a stroug
circulation at the bottom of the water chamber and preserve the same level in both
the shells forming the double ended boiler. A large transverse water passage tube
may be arranged so as to connect the two water passage tubes above described at
the centre of the lower part of the combustion chamber below the bridges, and from
which a wall of water tubes leading up to the steam chamber may extend to
separate the combustion chamber or chambers of one end from the combustion
chamber or chambers of the other end of the double ended boiler.
One or two or more steam pipes connect the steam chambers of both shell boilers
to equalize the pressure.
Doors with a regulating damper are fitted at the rear end of the ash pits to
admit air underneath the fire grates from the rear end of the boiler to improve the
combustion..
Boilers constructed according to my invention will be lighter, simpler, less
sensitive to differences of temperature and to rapid changes of fire than boilers as
heretofore constructed, whilst the screen of water tubes in front of the tube plates
will to a great extent, protect the plates and tubes from damage under forced
draught.
Another advantage of my arrangement is the facility for admitting air, to the
required extent for improving the efficiency of combustion, under the rear end of
the fire grate through a regulating door fitted under the bridge and underneath the
casing of water tubes forming the combustion chambers.
Deted the 10th day of March 1900
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
Improvements in Marine Boilers.
I, NABOR SOLIANI, of Brescello (Emilia) in the Kingdom of Italy, Director
of Naval Construction, Royal Italian Navy, 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 to marine boilers of the cylindrical type and has for its
object to improve such boilers whereby they may possess the advantages of water
tube boilers in addition to their own good features.
According to my invention I provide marine cylindrical boilers with water
tubes and to this end I dispense with the water spaces around the ordinary
combustion chambers and substitute for them water tubes some of which are
arranged as a protecting screen in front of the tubes and tube plates.
In the accompanying drawing,
Figure 1 is a longitudinal vertical section of a single ended marine boiler having
my improvements applied thereto.
Figure 2 is a horizontal section of the same:

page_text: Figure 3 is a longitudinal vertical section of a double ended marine boiler having
my improvements applied thereto, and
Figure 4 is a transverse vertical section of the same.
In applying my invention to single ended cylindrical boilers (as shewn in
Figures 1 and 2) the after part containing the combustion chambers and water
spaces and the portion of the steam chamber above the same is dispensed with and
the tube plate A is extended to form the back end of the boiler shell.
A row of bent water tubes a, a is arranged so as to extend from a large
transverse horizontal water pipe 6 connected to the bottom space of the boiler up
to the water level or steam chamber, above the fire tubes c so as to replace the
back and sides of the combustion chamber or chambers which are dispensed with
as above described. These tubes a, a are arranged close to one another in such a
manner as to form a continuous wall or walls of water tubes enclosing the said
combustion chamber or chambers.
A similar row or rows of water tubes d, d bent in a curve similar to a letter C
is or are fitted vertically and parallel to one another in front of the fire tubes c, c
so as to extend from points below the lower row of fire tubes just above the
furnaces and up to the water level or steam chamber above the upper row of fire
tubes, the said water tubes being properly spaced so as to leave the necessary
passage for the flames and hot products of combustion, whilst absorbing
sufficient portion of their heat to prevent overheating of the fire tubes c, c and of
the tube plate A.
A space is left between this second row or rows of water tubes d, d and the tube
plate the said space being accessible from the sides of the boiler for visiting,
repairing and refitting the fire tubes.
Doorse with regulating dampers are fitted at the rear end of the ash pits for
admitting air underneath the fire grates g from the rear end of the boiler for the
purpose of improving the combustion.
In applying my invention to a double ended marine cylindrical boiler (as shewn
in Figures 3 and 4) the central part containing the combustion chambers and the
water spaces and the portion of the steam chamber above the same is dispensed
with and the tube plates which are extended to form the back ends of the shells of
two single ended boilers B and C are deprived of their combustion chambers and
arranged back to back with a space between them.
Two rows of water tubes h, h bent like a letter S, are arranged vertically and
parallel and crossing each other and extend from points underneath the lower row
of fire tubes c, c just above the furnaces of one boiler up to the water level or
steam chamber of the other boiler, in such a way as to form a ceiling to replace
that of the combustion chambers and a screen of water tubes in front of the tube
plate, to protect the plate and fire tubes.
Another row of water tubes bent in the form of a letter C may be added in
front of the tube plates if necessary to protect the tubes and tube plates more
efficiently from the damage arising from forced combustion.
Two large water passage tubes i, i connect at the sides the lower part of the
water chambers of both boilers B and C and from each of them a close row of
water tubes j, j extends up to the steam tubes kk connecting the steam chambers
of the boilers B and C and takes the place of the sides of the combustion chambers
which are dispensed with as above described, open spaces being left for proper
access to the fire tubes e, e for visiting, repairing and refitting them when necessary.
The large water passage tubes i, i above mentioned will promote a strong circulation
at the bottom of the water chamber and preserve the same level in both the
shells B and C forming the double ended boiler. A large transverse water
passage tube may be arranged so as to connect the two water passage tubes i, i
above described at the centre of the lower part of the combustion chamber below
the bridges and from which a wall of water tubes leading up to the steam chamber
may extend to separate the combustion chamber or chambers of one end from the
combustion chamber or chambers of the other end of the double ended boiler.

page_text: Doors e with a regulating damper are fitted at the rear end of the ash pits f to
admit air underneath the fire grates g from the rear end of the boiler to improve
the combustion.
Boilers constructed according to my invention will be lighter simpler, less
sensitive to differences of temperature and to rapid changes of fire than boilers as
heretofore constructed whilst the screen of water tubes in front of the tube plates
will to a great extent protect the plates and tubes from damage under forced
draught.
Another advantage of my arrangement is the facility for admitting air, to the
required extent for improving the efficiency of combustion under the rear end of
the fire grate through a regulating door fitted under the bridge and underneath
the casing of water tubes forming the combustion chambers.
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. In marine boilers the employment of water tubes, in lieu of the usual water
spaces around the combustion chambers substantially as hereinbefore described and
illustrated.
2. The improvements in marine boilers herein before described and illustrated in
the accompanying drawing.
ying drawing.
18 18th day of December 1806
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.