Improvements in and connected with Water-tube Steam Generators.
Year: 1899

page_text: Date of Application, 6th Nov., 1899
Complete Specification Left, 4th Aug., 1900-Accepted, 6th Nov., 1900
Improvements in and connected with Water-tube Steam Generators.
I, ROBERT SCOTT, of 292, Camden Road, in the County of London, Gentleman,
do hereby declare the nature of this invention to be as follows
-
My invention relates to water-tube steam generators and has for its object to
provide means to form, and to facilitate the tightening of, the tube joints, and
which tightening may, according to my invention, be effected even while the
boiler is under steam
In one class of generators according to my invention "headers"
pensed with and in lieu thereof junction boxes of special form employed
may be dis-
In caying out my invention I toim or fix neai one end or both ends of each
tube an annular flange or colla The junction box is bored and recessed so that
while the tube end enters the bore the aunula colla upon the tube (subject
to the interposition of a packing ing on the like it necessary) butts against the
ecessed portion of the junction box The heads of a suitable number of F-shaped
bolts engage behind the said collar and the stem of each bolt passes through
a lug provided for that purpose in the junction box A nut may engage with the
Screw-threaded end of the bolt stem, and upon screwing up the said nut the tube
Joint will be tightened since the head of the bolt engages behind the annular
collai upon the said tube
An arrangement such as described is well adapted to form a snuous or zig-zag
water-tube connection between an upper and lower water drum but it is not
limited thereto
3
37
1
1000
Improvements in and connected with Water-tube Steam Generators.
I, ROBERI SCOTI of 292, Camden Road, in the County of London, Gentleman,
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..
My invention relates to water-tube steam generators and has for its object to
provide means to form, and to facilitate the tightening of, the tube joints, and

page_text: which tightening may, according to my invention, be effected even while the
boiler 18 under steam
In one class of generators according to my invention "headers" may be dis-
pensed with and in lieu thereof junction boxes of special form employed.
In the accompanying diawings, which illustrate my invention,
Figure 1 18 a fiont elevation of a water-tube boiler, part of one of the outer
doois being broken away and the fittings and other far details being omitted foi
the sake of clearness, and
Figure 2 18 a vertical longitudinal section thereof.
Figures 3, 4 and 5 are respectively front, side and rear elevations, drawn to a
larger scale, of my special form of junction box, and
Figure 6 18 a longitudinal section thereof taken on the line Z, Z of Figures 3
and 5.
In Figures 1 and 2, A and B represent the front and rear runs of fire bars,
and C and D their centre and end supports E represents a steam and water drum
which is connected with the lower drum F by means of a series of zigzag water
tubes G, which constitute the heating surface, and a suitable down-comer H
located preferably outside the boiler casing I The said tubes G are contained
within the casing I and the generator is provided with a giate J
K is the uptake
It will be understood that as the water within the tubes G becomes heated it
118es to the drum E whence such of it as not been converted into steam descends
through the downcome H into the lower dium F which retains any solid matter
that the water may contain
Instead of employing headers, as 18 usual with this type of generator, I, accord-
ing to my invention, build the water tubes G into a zig-zag series of sinuous con-
81uction by means of the junction boxes L. In this way the tubes which are
never uniformly heated are free to expand independently of each other, thereby
relieving the whole system of a severe strain, materially lengthening the life of
the boiler and reducing its liability to leakage
For the purpose of making the tube joints and to afford means for connecting
them to the junction boxes L, the tubes & are provided with external flanges M
near their extremities and they are inserted within the openings N of the said
Junction boxes (see Figures 3 to 6) The tubes are retained in position by
F-shaped bolts O These bolts O enter lugs P of the junction box L and are
provided with nuts by means of which the said tubes G may be clamped to
Then seating and a water-tight joint obtained Packing 11ngs R may be added
if necessary.
With auch an arrangement the tubes G may be tightened on their seatings, even
while the boiler 18 under steam, by tightening the nuts Q This operation 18
facilitated by the arrangement shown in Figure 2, according to which the water
tubes G pass feely through partitions S before attachment to their respective
Junction boxes, which are thereby shielded from contact with the hot pioducts
of combustion. Access to them may, however, be freely gained through the outer
do019 T
Suitable non-conducting covering (not shown) may be employed to prevent loss
of heat by radiation It will be obvious that the airangement of junction box
described permits of easy insertion, removal or replacement of any of the tubes G
of the system, and that the use of the said Junction box is not limited to the
particular construction of boiler illustrated in the diawings
Having now particularly described and ascertained the nature of my said in-
vention and m what manner the same is to be performed, I declare that what I
claim 18.
1 In a water-tube steam generator the junction box constructed substantially
as described
2 The combination, in a water-tube steam generator, of tubes having flanges M,
Junction boxes having openings N to receive the tube-ends, and bolts U operated

page_text: by nuts Q, for the purpose of making the tube joints and whereby the tightening
may be effected even while the boiler is under steam
The water-tube steam generator constructed substantially as described with
reference to the accompanying drawings
Doted the ith du of August 1000
A F. SPOONER,
323, High Holborn, London, Agent for the Applicant.