Improvements in Filtering Apparatus for Boiler Feed Water.
Year: 1894

page_text: Date of Application, 10th Nov., 1894
Complete Specification Left, 9th Aug., 1895-Accepted, 14th Sept., 1895
PROVISIONAL SPECIFICATION.
Improvements in Filtering Apparatus for Boiler Feed Water.
I, ROBERT RISK, of Halidon Villa, Cambuslang, in the County of Lanark,
North Britain, Engineer, do hereby declare the nature of this invention to be as
follows, that is to say :-
My said invention has for its object to improve the construction and operation,
f apparatus for filtering boiler feed water.
The apparatus is arranged so that the water may pass through it on its way from
the feed pumps to the boiler; and according to one modification, it comprises a
vessel the lower part of which is made with inlet and outlet passages for connection
to piping and with a by-pass passage, the passages being provided with valves.
Above the bottom part the vessel is made with a cylindrical chamber having a
conical or dome-shaped upper part. In a central opening in the bottom of the
chamber and communicating with the outlet, there is fitted a hollow centre formed
on the under side of a hollow disk which is free to turn. In the upper side of the
hollow disk there are fixed one or more circular sets of vertical tubes the sides of
which are perforated; and on these tubes are placed coils or pipe-like formations
of suitable fibrous filtering material such as cocoa or manilla cloth or matting.
Or the filtering material may be on bobbins placed on the vertical tubes. On
a central spindle extending out through a top stuffing box and arranged to be
screwed up and down, there is fixed a cap which covers the several filtering
pieces (excepting as hereinafter explained) and when these are in place can be
serewed down to compress them so as to prevent free passage of water at their
upper and lower ends. For replacing any one of the filtering pieces an opening
provided with a screw plug is made in the cover of the apparatus, and a part
of the cap is cut out sufficiently to allow of a single filtering piece being drawn
ont. This cut-out part of the cap being turned so as to coincide with the cover
opening the set of filtering pieces are turned by means of any convenient
instrument to bring any one of them or each in succession to the position in
which it can be drawn off its vertical tube and out through the cover opening,
a fresh filtering piece being thereafter introduced and placed on the tube. The
inlet passage for the water extends upwards with a widening area so that the
current may become slower, and opens into the chamber at some distance up
the side. The water entering the chamber has not immediate access to the
filtering material, there being interposed a shell of thin metal, over the outside
of which the water spreads, getting to the interior of it by passing under its
bottom edge. Owing to the comparative slowness of the current within the
chamber there is opportunity for oil or light impurities to rise to the top of
the chamber whence they may be discharged through a stopcock. And within
the shell, also, light impurities may rise to the upper part of the shell, which
is made bigher than the filtering parts for the purpose, such impurities either
passing through a small hole in the top of the shell, or through a stopcock, or
being removed from the shell periodically.
Dated this Ninth day of November 1894.
EDMUND HUNT,
Applicant's Agent.

page_text: Improvements in Filtering Apparatus for Boiler Feed Water.
I, ROBERT RISK, of Halidon Villa, Cambuslang, in the County of Lanark,
North Britain, 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, that is to say :-
My said invention has for its object to improve the construction and operation of
apparatus for filtering boiler feed water.
The apparatus is arranged so that the water may pass through it on its way from
the feed pumps to the boiler; and according to one modification, it comprises a
vessel the lower part of which is made with inlet and outlet passages for connection
to piping and with a by-pass passage, the passages being provided with valves.
Above the bottom part the vessel is made with a cylindrical chamber having a
conical or dome-shaped upper part. In a central opening in the bottom of the
chamber, and communicating with the outlet, there is fitted a hollow centre
formed on the under side of a hollow disk which is free to turn.
In the upper
side of the hollow disk there are fixed one or more circular sets of vertical
tubes the sides of which are perforated; and on these tubes are placed coils or
pipe-like formations, hereinafter termed mantles, of suitable fibrous filtering
material such as cocoa or manilla cloth or matting. Or the filtering material
may be on bobbins placed on the vertical tubes. For replacing any of the
filtering pieces an opening is provided in the cover of the apparatus of sufficient
size to allow of a single mantle being drawn out. The inlet passage for the
water extends upwards with a widening area so that the current may become
slower, and opens into the chamber at some distance up the side. The water
entering the chamber has not immediate access to the filtering material, there
being interposed a shell of thin metal, over the outside of which the water spreads,
getting to the interior of it at its ends. Owing to the comparative slowness of
the current within the chamber there is opportunity for oil or light impurities
to rise to the top of the chamber whence they may be discharged through a
stopcock.
And in order that my said invention and the manner of performing the same
may be properly understood I hereunto append two sheets of explanatory drawings
to be hereinafter referred to and showing two modifications of my improved filtering
apparatus.
Figures, 1, and 2, on Sheet, 1, are respectively vertical and horizontal sections,
and Figures, 3, and 4, are a sectional elevation and a second horizontal section of
one modification, Figure 3, being taken as at right angles to Figure, 1. Figures, 5,
and 6, on Sheet, 2, are respectively vertical and horizontal sections of a second
modification. In these drawings the same reference letters and numerals are used
to mark the same or like parts wherever they are repeated.
The modification of the apparatus shown on Sheet, 1, of the drawings comprises
a vessel, A, the lower part of which is made with inlet and outlet passages, B,
and C, for connection to piping, and with a by-pass passage, D, the passages being
provided with valves, F, G, and H. Above the bottom part, the vessel, A, is
made with a cylindrical chamber having a dished or it might be a conical or dome-
shaped cover, J. In a central opening, K, and communicating with the outlet, C,
there is a hollow centre, L, formed on the under side of a hollow disk, M, which is
free to turn. In the upper side of the hollow disk, M, there are fixed one or it
might be more circular sets of vertical tubes, N, the sides of which are perforated;
and on these tubes are placed mantles, coils or pipe-like formations of suitable
fibrous filtering material, P. A central spindle, M 1, is fixed to the hollow disk, M,
carrying the vertical tubes, N, and extends upwards through a stuffing box, M 2,

page_text: and it is pressed downwards by a screw, M 3, to secure the hollow centre, L, tightly
in position. A handled plug, P 1, is fixed in the upper end of each filtering
mantle, P, and an annular projection, P2, formed on the chamber cover, J,
prevents the filtering mantles from rising out of place. For replacing any of the
filtering mantles, P, an opening, J 1, is provided in the chamber cover, J, this
opening being closed by a cap, J 2. The annular projection, P 2, is cut away at
the opening, J 1, but when the cap, J 2, is in place a projection, J 3, on it occupies
the space in the annular projection. The hollow disk, M, is turned by means of the
central spindle, M 1, (which is made with a square top end to receive a key) to
bring each filtering mantle, P, opposite the opening, J1, through which it is drawn
off its vertical tube, N, and a fresh mantle is thereafter introduced and placed on
the tube. The inlet passage, B, for the water extends upwards with a widening
area so that the current may become slower, and opens into the chamber at some
distance up the side. The water entering the chamber has not immediate access to
the filtering mantle, P, there being interposed a shell, Q, of thin metal over the
outside of which the water spreads, getting to the interior of it at its ends.
The modification of the apparatus shown in Figures, 5, and 6, is arranged so that
the feed water may pass through it on its way to the feed pumps. The vessel, A,
is similar to that of the first modification but it is of simpler and lighter construction.
It is provided with an inlet passage, B, and an outlet passage, C, and the vertical
tubes, N, are fixed to the bottom of the vessel, which is hollow. The mantles, P,
are kept in place by the cover, J, of the apparatus, which is bolted to the vessel in
a manner to press on them, and when any mantle is to be changed the cover is
removed for the purpose.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what I
claim is :-
1. The combination and arrangement of parts constituting the improved filtering
apparatus for boiler feed water substantially as herein before described with
reference to Figures, 1, 2, 3, and 4, of the accompanying drawings.
2. The combination and arrangement of parts constituting the improved filtering
apparatus for boiler feed water substantially as hereinbefore described with
reference to Figures, 5, and 6, of the accompanying drawings.
3. In filtering apparatus for boiler feed water, combining in one chamber a
plurality of comparatively small removable mantles or coils of filtering material on
perforated metal tubes with inlet, and outlet passages and valves, substantially as
hereinbefore described.
Dated this Eighth day of August 1895.
EDMUND HUNT,
Applicant's Agent.