Year: 1886

page_text: We JOHN FRANKLIN ALLEN, and JOHN HAVELOCK ALLEN both residing a
137th Street near 3rd Avenue, in the City and State of New York, United States
of America, Gentlemen, 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 :—
Our invention relates to sectional tube boilers, in which the violent circulation
of water amongst the tubes is prevented, and the invention consists in the various
elements of improvement hereinafter more fully pointed out.
In the drawings, Fig. 1 is a side view of our improved boiler with the mason
work removed. Fig. 2 is an end view of the same.
The letters a a &c., b b &c, c c &c., d d &c., e e &c., represent five superposed
series of tubes, the tubes of each series being placed side by side, and above the
tubes forming the next series. All the tubes of each superposed series are connected
at their upper ends by transverse drums A B C D E, as shown.
Every vertical set of tubes a b c d e, that is, every set formed from one tube of
each superposed series and placed above or below the tubes of the next series, are
connected at their lower ends by communicating chambers n¹ n³ n³ n* n³, as shown.
These chambers form a series of vertical rows or headers, and all the upper
chambers are again connected with each other by nipples, and the lower chambers
are connected to a drum 8, and in this way each chamber is in either direct or
indirect communication with each of the other chambers, thus establishing com-
munication between the lower ends of all the tubes.
t is a feed pipe connected to one of the outer chambers of the top row, and s is
a drum connected to the chambers of the bottom row and provided with blow off
pipe P.
The transverse drums ABCDE are connected through pipes A² B¹ C¹ D¹ E¹
with a steam drum H, the ends of said pipes projecting some distance into said
steam drum to obtain some space in the lower part of the steam drum for the
collection of accumulated water.
is a pipe connecting the lower part of steam drum H with one of the transverse
drums E to allow the accumulated water to return.
J is the steam outlet pipe to conduct the generated steam to any part desired.
The whole plant of pipes, drums and chambers with the exception of the steam
drum H is placed in mason work W in which the fire grate bars G are built. The

page_text: gases and smoke escape at the rear end, as shown at K. L L are openings closed
by suitable doors and located in the back and sides of the walls to gain admittance
to the interior.
Instead of connecting feed pipes t to the upper row of chambers, a drum v may
be placed into the inside of the mason work, as shown by dotted lines in fig. 1. In
this case the pipe t¹ from the feed pamp is connected to the drum, and the drum is
connected to the upper row of chambers. A suitable connection must also in this
case, be made between the top of the drum v and the steam drum H.
The steam generated in the several tubes a b c d e, will escape from the upper
ends of said tubes into their respective transverse drum A B C D E, and from
there into the steam drum H. The water is supplied to the tubes, at their lower
ends only through their chambers.
At the upper ends of the tubes, water connections exist only between the tubes
of each of the superposed rows, but no water connections exist between the vertical
rows, and thus the several superposed rows will be perfectly independent from the
vertical rows. At the same time, as each row is supplied only from the lower end,
the temperature of water at the lower ends of all the tubes below and at the back
of the bridge wall y will only be equal to the temperature of water as supplied by
the feed pump or feed drum v, while at the upper ends of the tubes the temperature
may rise to about 300° to 400° F.
The escaping gases passing thus the coldest part of the tubes will be considerably
reduced in temperature over and above what they would be if the whole length of
tubes were of an equal temperature.
The water fed into the tubes is in the exact proportion as it is converted into
steam and gradually heated as it rises.
Thus as the water in the uppermost row of tubes is least effected by the heat, it
will generate the least amount of steam, and consequently the least quantity of
water will be supplied to it. The other rows will evaporate and receive water in
proportion to their greater or less vicinity to the fire. The water level is supposed
to be about in the center line of the pipes or drums A B C D E.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim is :-
1st. The combination in a boiler, of the tubes, arranged in a series of superposed
rows, with chambers that establish a communication between all the tubes at their
lower ends, and with drums that connect separately all the tubes of each super-
posed row at their upper ends, while the several superposed rows are disconnected
at such upper ends, substantially as specified.
2nd. The combination of tubes a a, b b, c c, with chambers n³ n³, connecting
lower ends of the tubes a b c, and with drums A B C, connecting respectively upper
ends of tubes a a, b b, c c, and with the pipes A'B'C', drum H, feed pipe t, drum 8,
blow off pipe P, outlet pipe J, and grato bar G, substantially as specified.