IMPROVEMENTS IN APPARATUS FOR CLEANING STEAM BOILERS
Year: 1884

page_text: I, HERBERT JOHN HADDAN, of the firm of Herbert and Company, Patent Agents,
of 67, Strand, in the City of Westminster, Civil Engineer, do hereby declare the
nature of my Invention for IMPROVEMENTS IN APPARATUS FOR CLEANING STEAM
BOILERS, 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 and is a device by which a steam boiler may be cleaned
of all sediment and cause all scales formed by such sediment on the interior of such
boiler to become detached from said boiler to become pulverized and thrown out of
Buch boiler. To accomplish these results I cause a pipe to be placed at the bottom
of a steam boiler, inside the same in the water and near the lowest point. This
pipe is to run lengthwise with the boiler. The rear end of this pipe is closed with
a cap. At frequent intervals along sad pipe are inserted nipples or tubes, from an
inch to two inches long, and screwed into said pipe. The outer end of such nipples
or tubes are bevelled on the inside to an edge. Outside said boiler, upon said pipe
is attached an escape valve of such a character as will permit said pipe to be
instantly opened to its full capacity and at once closed again. By opening and
closing this valve quickly the rush of the water in said boiler, with the steain
pressure thereof through said nipples or tubes, and then stopping this rush, will
shock or vibrate the contents of the boiler which with the agitation of the water
under steam pressure, will cause all scales or sediment to break off the boiler to be
carried against the bevelled nipples and broken up or pulverized and then to be
drawn off through said nipples or tubes into said pipe and so out of said boiler.
The said pipe and said nipples or tubes must be of such size, with relation to each
other, that the area of a cross section of snid pipe will be greater than the sum of
the areas of the cross sections of all the tubes or nipples.
Fig. 1 represents a side view of a boiler in place, with the pipe C, C, running
into and along the bottom of the same. B represents the escape valve.
Fig. 2 represents a view of the bottom of a boiler with pipe as located therein.
C, C, is the pipe. B the escape valve. A, A, A, A, are the nipples or tubes screwed
into the pipe C, C.
Fig. 3 represents one of the nipples or tubes, C is the pipe, A the nipple or tube
screwed into the pipe. The dotted lines & show how the inside of the nipple or
tube is bevelled to an edge at d.

page_text: Figs. 4 and 5 are end views of a boiler partly broken away showing application
of Invention.
I am aware that prior to this Invention a perforated pipe such as or similar to
pipe C has been made and used to clean a boiler in combination with an ordinary
globe valve. I am also aware that prior to this Invention valves of different
patterns have been made that may be used to open a pipe instantly to its full
capacity. I do not therefore claim such pipe broadly, or such valve, but what
I do claim as this Invention, and desire to secure by Letters Patent is :-
1. In combination with a steam boiler, of a pipe C situated near the bottom
thereof, and provided with short tubes A having sharp bevelled ends d, and a
valve B, all of the above parts combined and adapted to operate as described.
2. In combination with a steam boiler, of a pipe C situated near the bottom
thereof; and provided with a series of short tubes A, having sharp bevelled ends d,
the said pipe C, being greater in cross section than the sum of the areas of the
cross sections of the short tubes, substantially as set forth.
DL170th
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