Improvements in Water-tube Steam Boilers.
Year: 1891

page_text: Date of Application, 1st Dec., 1891-Accepted, 5th Mar., 1892
COMPLETE SPECIFICATION.
Improvements in Water-tube Steam Boilers.
I, HARRY WALTER SELLER, of 10A Third Place, City of Brooklyn, in the
County of Kings, in the State of New York, United States of America, Mechanical
and Consulting 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:-
This invention relates to water-tube steam boilers and is illustrated in the accom-
panying drawings, in which
Figure 1 is a side elevation of my improved water-tube boiler with the boiler
setting in section on the linea in Figure 2.
Figure 2 shews a front end elevation of one half, the other half being in section
on the line y y in Figure 1.
Figure 3 shews a side elevation of a modified construction of my improved
boiler.
Figure 4 shews a vertical cross section of same on the line in Figure 3.
Figure 5 shews a side elevation partially in section of another modified construction
of my improved boiler.
Figure 6 shews a front end elevation of same.
Figures 7, 8 and 9 shew detail views of the sector shaped boxes in which I secure
the ends of the water tubes.
Like letters refer to like parts in all the figures.
The objects of my invention are:-
First, to construct a water-tube boiler having boxes preferably sector shaped, to
receive the ends of the tubes forming the major portion of the heating surface of
such boiler, the upper of the said boxes being at the front end of the boiler above
the furnace, and the lower of the said boxes forming the rear end of the furnace, one
or more banks of water tubes connecting the said boxes together.
Second, to provide in the lower and rear box a partition extending from the
bottom of the said box upward about two thirds of the height and from end to end
thereof, so as to form a mud and sediment depository in the said box at the rear of
the said partition.
Third, to provide a bridge wall extending from the upper side of the rear box, at
the rear of and above the upper tier of tubes connecting the said boxes and con-
forming to the curve thereof.
Fourth, to connect the box at the front end of the furnace in which the upper
ends of the banks of water-tubes are secured, with steam drums, provided with
tubes as in ordinary tubular boilers, or made without such tubes, by means of
up-flow pipes, and also the box at the rear end of the furnace, in which the
lower ends of the banks of water tubes are secured, with such steam druns, by
means of down-flow pipes at the rear of the bridge wall, so as to ensure adequate
steam and water circulation therein. The other features of my invention are set
forth hereinafter in the Specification and Claims.
In Figures 1 and 2, I shew a boiler constructed with two tubular steam
drums A, A, the front ends of both of which are connected to the upper sector
shaped box B by means of large pipes H¹ and their rear ends to a large cross
pipe C; from which pipe C a row of small tubes c extend down to and enter
the rear portion of the lower sector shaped box B' at the rear of the bridge
wall D; the pipe C being also connected to the upper portion of the face 6 of
the upper box B by means of a row of horizontal pipes d.
The boxes B and B are connected together by means of banks of water
tubes E and E¹ the ends of which enter the plane surfaces 6 and 6 of the

page_text: boxes B and B and are secured therein preferably by expanding the ends thereof
in the manner ordinarily employed in securing tubes in boiler heads.
The major portion of the banks of tubes E and E are preferably located at
an inclination of about 30° from a horizontal so as to admit of room under the
front ends thereof for a furnace F in which the fuel is placed upon grate
bars f.
At the rear of and above the upper tier of tubes in the upper bank E' of
water-tubes secure a bridge or fire wall D which extends from the upper face b
of the box B forming the rear of the furnace F, say about three fifths of the
distance from the face 6 of the box B¹ (following the curve of the bank of
tubes E¹) to the face b of the box B, so that the heat from the fire box F
passes up between the tubes in the banks E and E thereof, and out between
the end of the bridge wall D and the face of the box B and up between the
horizontal pipes d against the lower sides of the steam drums A and A', and
along to the rear ends thereof, and through the tubes a therein to the front
ends of the said steam drums and out through a chimney C secured to the front
ends of said steam drums A. A by means of breeching g of usual and ordinary
construction.
The sector shaped boxes B and B are provided with man-holes H on the
curved sides thereof so as to admit of access to the insides thereof, and in
the lower and rear box B¹, 1 secure a partition I extending from the lower and
curved side thereof upward, say about two thirds of the distance, to the
angle formed by the junction of the plane sides and of the box, and
from end to end of the said box, the object of this partition being to form a
chamber in the rear portion of the box B' for the reception of sediment which
can readily be blown out therefrom through the blow-off pipe J in the usual way.
The boxes B and B I preferably make of boiler plate the plane surfaces b
and being stayed and braced in any convenient manner.
In Figures 3 and 4 the construction shewn of my improved water tube boiler
is the same in all respects as that hereinbefore described, except that it has but
a single cylindrical steam drum A2; and in that the products of combustion after
passing up to and against the lower side of the steam drum A³, pass along to
the rear end thereof and out through the opening K in the rear of the boiler
setting L to the chimney (not shewn); a damper & being preferably placed in
the opening K to control the draught; and also in that below the lower rear
water box B and communicating therewith, is a mud drum M into which the
sediment settles preparatory to being blown off, the partition I in this construc-
tion being dispensed with.
In Figures 5 and 6, I shew my invention in a modified form, viz. In this
construction the steam drum A³ instead of being located longitudinally over the
banks of water tubes, is located transversely. over the front box B and is con-
nected therewith by a row of small pipes and is connected to the large trans-
verse pipe C by means of horizontal pipes l. The water tubes in this form of
construction are also made with a different curve from those in the two preceding
forms hereinbefore described, in that they are so bent that the lower bank E
and the upper bank E³ when in place, nearly form the upper and lower sides
of an ellipse. In this construction it will also be observed that the inclination
of the water-tubes E and E³ is greater than in the forms hereinbefore described.
In all other respects the construction is substantially the same as that of the
other forms herein before described.
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 combination in a water-tube boiler, of banks of curved inclined water-
tubes, with a water box above the front end of the furnace, in which the front
and upper ends of the said water-tubes are secured, a water box at and forming

page_text: a part of the rear end of the furnace, in which the rear and lower ends of the
said banks of water-tubes are secured, and a steam drum or drums connected
with both the upper and lower water boxes, substantially as and for the purpose
set forth.
2. The combination in a water-tube boiler, of banks of curved inclined water-
tubes, a water box at the front end of the boiler above the front end of the
furnace in which the front end of the said water-tubes are secured, and a water
box at, and forming a part of, the rear end of the furnace in which the rear end
of the said tubes are secured, with a partition I in the lower and rear of the
said water boxes, and a bridge wall D extending from the lower water box
upward and forward at the rear of and above the upper tier of water tubes,
substantially as and for the purpose set forth.
3. The combination in a water-tube boiler, of banks of curved water-tubes,
such as E and E, and water boxes, such as B and B¹, in which the ends of
the said tubes are secured, with a steam drum or drums connected to the front
water box B, with a large transverse pipe or drum C, over the rear and lower
water box B, pipes d connecting the said pipe or drum C with the front and
upper water box B, and pipes connecting the said pipe or drum C with the
lower and rear water box B, at the rear of the bridge wall D, substantially as
and for the purpose set forth.
4. The combination in a water-tube boiler, of banks of inclined curved water-
tubes as E and E', with sector shaped water boxes such as B and B', in which
the ends of the said banks of tubes are secured, substantially as and for the
purpose set forth.
Dated the 1st day of December 1891.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.