Improvements in Fire-tube Boilers.
Year: 1894

page_text: Date of Application, 30th Apr., 1894
Complete Specification Left, 29th Dec., 1894-Accepted, 2nd Feb., 1895
Improvements in Fire-tube Boilers.
I, WILLIAM RUSSELL CUMMINS of 6 Roseangle, Dundee in the County of
Forfarshire, North Britain, Engineer do hereby declare the nature of this
invention to be as follows:-
The tube plate & tube ends of fire-tube boilers are protected from injury by
excessive heat, by means of one or more rows of water tubes, arranged immediately
in front of the tube plate.
These water tubes, which may be vertical or inclined, have their lower ends
suitably connected to the bottom of the boiler, or to a vessel in connection with the
bottom of the boiler, and their upper ends connected to any suitable part of the
boiler above the fire tubes, or to a vessel connected to the top of the boiler.
By this means the tube plates are shielded from the intense heat of the com-
bustion chamber and an efficient circulation of water in the boiler also results, thus
preventing any overheating of the tube plates or tube ends.
The circulation of water in the boiler may be still further increased by placing
water tubes round the inside of the combustion chamber. These tubes may be
vertical or inclined and connected in a suitable manner to the top and bottom of
the boiler, or to vessels in connection with the top and bottom of the boiler.
Doted this 97th dox of Anril 1801
W. R. CUMMINS.
Improvements in Fire-tube Boilers.
I, WILLIAM RUSSELL CUMMINS of 6 Roseangle, Dundee, in the County of
Forfarshire, North Britain, 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 tube plates and tube ends of fire tube boilers are protected from injury by
excessive heat, by means of one or more rows of water tubes, arranged in front of
the tube plate. These water tubes, which may be vertical, or inclined, have their
lower ends suitably connected to the lower portion of the boiler, or to a vessel in
connection with the lower portion of the boiler. Their upper ends are connected
to any suitable part of the boiler above the fire tubes, or to a vessel connected to
the upper portion of the boiler.
By this means the tube plates & tube ends are shielded from the intense heat of
the combustion chamber, and an efficient circulation of water in the boiler also
results, thus preventing any overheating of the tubes plates or tube ends.
The circulation of water in the boiler may be still further increased by placing
water tubes round the inside of the combustion chamber. These water tubes may
be vertical or inclined, & have their upper ends suitably connected to the upper
portion of the boiler, and their lower ends to the lower portion of the boiler, or
they may be connected to vessels in communication with the upper & lower portions
of the boiler.

page_text: Fig. 1. Sheet 1 shews the invention as applied to a boiler of the marine type,
where A A A are the fire tubes, B the tube plate, C C the water tubes arranged
in front of the tube plate B. The upper ends of the water tubes C C are connected
to the vessel D, which is in communication with the upper portion of the boiler,
by means of the tubes E. The lower ends of the water tubes C C, are connected
to the vessel F, which is in communication with the lower portion of the boiler, by
means of the tubes G.
Fig. 2 Sheet 1 shews the invention as applied to a cylindrical boiler of the dry
backed type, where A A A are the fire tubes, B the tube plate, C C the water
tubes arranged in front of the tube plate, with their upper ends connected to the
vessel D, which is in communication with the upper portion of the boiler, by means
of tubes E, & their lower ends connected to the vessel F, which is in communication
with the lower portion of the boiler by means of tubes G.
Fig. 3 Sheet 2 shews the invention as applied to a cylindrical boiler with dry
back & external furnace, where A, A A are the fire tubes, B the tube plate,
CC the water tubes, arranged in front of the tube plate, with their upper &
lower ends connected respectively to the upper & lower portions of the boiler.
HH are water tubes arranged round the inside of the combustion chamber to
increase the circulation of water in the boiler. Their upper ends are connected to
the vessel D, which is in communication with the upper portion of the boiler, by
menus of the tubes E, & their lower ends are connected to the vessel F, which is
in communication with the lower portion of the boiler by means of the tube G.
Fig. 4 Sheet 2 shews the invention as applied to a boiler of the locomotive type,
where A A A are the fire tubes, B the tube plate, C C the water tubes with their
upper & lower ends connected respectively to the upper & lower portions of the
boiler.
The same principle will apply to any other type of firetube boiler, with the
details modified to suit the circumstances of the case.
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.) The arrangement of one or more rows of water tubes, placed in front of the
tube plate of fire tube boilers, as described in the Specification and accompanying
drawings, to protect the tube plate & tube ends from injury by excessive heat.
(2.) In conjunction with the above, the arrangement of water tubes placed round
the inside of the combustion chamber, as described in the Specification and accom-
panying drawings, to still further increase the circulation of water in the boiler,
thus preventing any overheating of the tube plates or tube ends.
Dated this 27th day of December 1894.
W. R. CUMMINS,
Applicant.