Improvements in Steam Boilers.
Year: 1889

page_text: Date of Application, 18th June, 1889
Complete Specification Left, 18th Mar., 1890-Accepted, 19th Apr. 1890
PROVISIONAL SPECIFICATION.
Improvements in Steam Boilers.
We, CHARLES FREDERICK DIXON, of the Cleveland Bridge and Engineering
Company of Darlington in the County of Durham Engineer and WILLIAM NATHAN
DACK of 10 Byron Street, Patricroft, in the County of Lancaster, Engineer, do
hereby declare the nature of this Invention to be as follows:-
This invention relates to the invention for which we applied for Letters Patent
numbered 6828 and dated April 24th, 1889, and consists of certain further improve-
ments upon the improvements then specified.
In carrying out our present improvements we propose to dispense with the pipe
employed to connect the steam or separating vessel at the top of the boiler with the
upper end of the chamber or chambers in which the upper ends of the obliquely set
or inclined tubes are fixed and instead to prolong said chamber or chambers or headers
and connect it or them directly to the end of the steam or separating vessel a number
of openings being made to admit, steam and water from the chambers or headers into
the steam or separating vessel.
Instead of connecting the feed water pipe to the down pipe connecting the other
end of the steam or separating vessel to the lower end of the inclined tubes we now
propose to form a chamber at this end of the separating vessel and at a point beyond
the down pipe or pipes. The wall or partition which separates this chamber from the
main portion of the separating vessel is perforated above the water level so as to allow
steam at all times to freely enter the chamber from the separating vessel while pre-
The feed water is introduced
venting the passage of water from one to the other.
through a perforated pipe extending across the chamber above the water level whereby
the feed water is heated by the steam admitted to said chamber as above mentioned.
We connect the lower part of the chamber by a pipe to the bottom of the vessel which
acts as a mud-drum or filter bed at the bottom of the boiler and within this pipe we
propose to fix a second and smaller pipe which is connected to a scum plate placed at
or about the water level in the chamber and terminates within the larger pipe at any
convenient distance below the said chamber.
The down pipe which conducts the water from the main body of the steam vessel
is connected to the upper part of the mud drum while the pipes from the end of the
chamber where the feed water enters are connected to the bottom of the mud
drum below the filtering medium so that only the feed water passes through the
filtering material.
Dated this 17th day of June 1889.
COMPLETE SPECIFICATION.
Improvements in Steam Boilers.
We, CHARLES FREDERICK DIXON, of the Cleveland Bridge and Engineering
Company of Darlington, in the County of Durham, Engineer, and WILLIAM NATHAN
DACK, of 10 Byron Street, Patricroft, in the County of Lancaster, Engineer, do
hereby declare the nature of this said 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 the invention for which we applied for Letters Patent

page_text: numbered 6828 and dated April 24th 1889 and consists of certain farther improve-
ments upon the improvements then specified.
In carrying out our present improvements we propose to dispense with the pipe
employed to connect the steam or separating vessel at the top of the boiler with the
upper end of the chambers in which the upper ends of the obliquely set or inclined
tubes are fixed and instead to prolong said chambers or headers and connect them
directly to the end of the steam or separating vessel a number of openings being
made to admit steam and water from the chambers or headers into the steam or
separating vessel.
And in order that our invention may be fully understood and readily carried into
effect we will describe the accompanying Sheet of Drawings reference being had to
the figures and letters marked thereon.
Figure 1 is a side sectional elevation.
Fig. 2 an end sectional elevation.
Fig. 3 an end elevation with part of the cover removed and
Fig. 4 a sectional plan of a water tube steam generator fitted with our improve-
ments.
Figs. 5 and 6 are cross sections of the front headers.
Figs. 7 and 8 are a side sectional elevation and an end elevation of an alternative
form of headers connected to the steam and water drum according to our invention.
In these views-a designates the fire grate, b the inclined water tubes, c the front
and d the back headers, e the separating vessel or steam and water drum, f the down
pipe connecting the drum e to the filter or mud drum g. The said filter g is sub-
stantially of the construction described in the Specification to our aforesaid Patent
No. 6828 of 1889 being provided with a blow off cock h and having fixed in it a
perforated plate i upon which is placed a layer or layers of filtering materials.
It will be seen that according to our present improvements we prolong the front
header c far enough in an upward direction to enable us to connect them directly to
the end of the steam and water drum e by means of a series of tubes or nipples j
which are expanded and secured in two corresponding series of openings formed
respectively in the headers c and the front end plate of the drum e. The ends of the
inclined water tubes 6 are expanded and secured at the front in the headers c and at
the rear in the back headers & which in turn are preferably prolonged downward as
shown and connected to the filter or mud drum 9 by a series of tubes or nipples ¹ in
a manner similar to that in which the front headers c are connected to the steam and
water drum e. The headers c and d have openings in their sides opposite to the ends
of the water tubes b and the nipples j j¹ respectively to enable ready access to be had
to the same, and these openings are closed by caps or covers k.
In this improvement the headers c extend across the entire face of the steam and
water drum e and each header has a number of tubes or nipples ; forming a series
of passages from the header into the steam and water drum equal or nearly equal
in area to the united areas of the vertical or zig-zag row of inclined water tubes b
fixed in said header.
The headers c being of large capacity and prolonged to about the level of the top
of the drum e it is obvious that the circulation will, be very free and unimpeded at
the point of their connection to the steam and water drum which is a great advantage
over the ordinary construction adopted in water tube boilers where the passage
between each front header and the steam and water drum is generally only about
one eighth of the united capacity of the inclined tubes discharging into that header
this restricted passage causing the circulation to be throttled and checked.
In Figs. 7 and 8 the form of the headers c is slightly varied and the end of the
steam and water drum e is shown enlarged. In this case the headers c are shown
curved and of large capacity at the upper end they extend across the face of the
drum and each header is connected thereto by a number of nipples j as hefore.
In the Drawings we bave shown each front header c connected to the end of
the steam and water drum e by five tubes or nipples ; but any suitable number other

page_text: than five may be employed for each header so long as the combined areas of said
tubes equal or approximate the combined areas of the inclined water tubes b which
enter the header. Again instead of connecting the prolonged headers to the end
of the steam and water drum we might connect them to the under side of said
drum.
The above remarks also apply wholly or in part to the back headers d and the
tubes or nipples j¹ for connecting the same to the filter or mud drum g; or in cases
where a vessel g is not employed for connecting the back headers d directly to the
rear end of the steam and water drum e.
Instead of connecting the feed water pipe to the down pipe connecting the other
end of the steam and water drum e to the lower end of the inclined water tubes bas
described in our aforesaid Specification we now according to this part of our
improvements propose to form a chamber e¹ at this end of the steam and water. drum
or separating vessel e and at a point beyond the down pipe f. The wall or partition ell
which separates the chamber from the main portion of the drum is perforated
above the water level so as to allow steam at all times to freely enter the
chamber from the drume while preventing the passage of water from one to the
other.
The feed water is introduced through a perforated pipe m extending across
the chamber e' above the water level whereby the feed water is heated by the steam
admitted to said chamber as above mentioned.
We connect the lower part of the chamber e¹ by a pipe n to the bottom part of
the vessel g which acts as a mud drum or filter bed at the bottom of the boiler and
within this pipe n we fix a second and smaller pipe o which is connected to a scum
plate p placed at or about the water level in the chamber and terminates within
the larger pipe n at any convenient distance below said chamber.
The down pipe f which conducts the water from the main body of the steam and
water drum e is connected to the upper part of the filter or mud drum g while the
pipes n and o from the chamber where the feed water enters are connected to
the bottom of the said vessel g below the filtering medium so that only the feed
water passes through the filtering material and in its passage is purified of all solid
matter before it enters the inclined water tubes b.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what
we claim is :-
In a water tube steam generator―
1. Prolonging the front headers so as to increase their capacity at their upper ends
and connecting each header to the steam and water drum by two or more nipples
the combined areas of said nipples being equal or nearly equal to the combined areas
of the row of inclined water tubes in communication therewith, whereby free
circulation is promoted at this point instead of being checked as is usually the
case.
2. The combination with the steam and water drum, of headers prolonged and
connected to said drum by a number of nipples forming passages the combined areas
of which are equal or approximately equal to the combined areas of the inclined
water tubes entering said headers substantially in the manner and for the purposes
herein set forth.
3. The combination with the headers c, of the nipples ; and the combination with
the headers d of the nipples 1 substantially as herein set forth.
4. The combination with the steam and water drum e connected to the rear headers
or to a vessel g of the chamber e¹ formed by a partition perforated above the water
level in the drum e so as to allow steam from the drum to pass through and heat the
feed water entering the chamber e' which is connected to the vessel g substantially as
herein set forth.
5. The combination with the steam and water drum e connected to the upper side
of the vessel g by a pipe for equivalent, of the chamber e¹ formed by the partition ell

page_text: which is perforated above the water level, said chamber e' being supplied with feed
water through a perforated pipe m and connected to the under side of the vessel g
by a pipe n in which is fitted a small pipe o connected to a scum trough p sub-
stantially as and for the purposes herein described and as illustrated by the Drawings
annexed.
Dated this 17th day of March 1800
H. B. BARLOW,
17, St. Ann's Square, Manchester, Agent for Applicants.