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

page_text: Date of Application, 3rd Sept., 1894
Complete Specification Left, 30th May, 1895-Accepted, 20th July, 1895
PROVISIONAL SPECIFICATION.
Improvements in Filtering Apparatus for Boiler Feed Water.
We, JAMES WILLIAMSON of 59, Octavia Terrace, Greenock, in the County of
Renfrew, North Britain, Marine Superintendent, and 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 :-
Our said invention has for its object to obtain better and more satisfactory results
in filtering boiler feed water by means of improved apparatus.
on it
The improved 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 cylindrical, the upper part being
conical or dome-shaped. Centrally in the lower cylindrical part of the vessel there
is a tubular piece the bottom of which communicates with the pipe proceeding
to the boiler, the upper end being closed by a screw cap which can be removed
for cleaning purposes. The central tubular piece is perforated, and
there is placed a bobbin-like piece on the barrel of which there is wound
or coiled the filtering material which consists, by preference, of cocoa matting.
Or instead of the cocoa fibre being used in the form of matting it may be in
the form of yarn, strand, or cord, and 'be wound on, to whatever thickness
may be found suitable. The barrel is made with slots or perforations through
which the water passing through the matting finds its way to the central
tubular piece and thence to the pipe proceeding to the boiler. The inlet for the
water to be filtered is at one side of the vessel, and it extends upwards with a
widening area so that the current may become slower, and opens into the interio
of the vessel at some distance up the side. The water entering the vessel 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 vessel there is opportunity for oil or light impurities to rise to the top
of the vessel, whence they may be discharged through a stop cock. And within the
shell also light impurities may rise to the upper part of the shell which is made
higher than the filtering parts for the purpose, such impurities either passing off
through a small hole in the top of the shell, or through a stopcock, or being
removed from the shell periodically.
The apparatus is provided with connecting branch pipes and with a by-pass pipe
and with stop valves, and also with a spring-controlled relief valve to prevent excess
of internal pressure which might be caused by obstruction. The vessel is fitted
with a bolted-on cover, to give easy access for cleaning and for renewing the
filtering material. Two or more separate filtering vessels may be provided in ohe
arrangement each fitted with inlet and outlet stop valves, so that when one vessel
is being cleaned the feed water may be passed through another or others.
Dated this First day of September 1894.
EDMUND HUNT,
Applicants' Agent.

page_text: Improvements in Filtering Apparatus for Boiler Feed Water.
We, JAMES WILLIAMSON, of 59 Octavia Terrace, Greenock, in the County of
Renfrew, North Britain, Marine Superintendent, and 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 :-
Our said invention has for its object to obtain better and more satisfactory
results in filtering boiler feed water by means of improved apparatus.
The improved 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 cylindrical, the upper part being
conical or dome-shaped. Centrally in the lower cylindrical part of the vessel
there is a tubular piece the botton of which communicates with the pipe proceeding
to the boiler, the upper end being closed by a screw cap which can be removed for
cleaning purposes. The central tubular piece is perforated, and on it there is
placed a bobbin-like piece on the barrel of which there is wound or coiled the
filtering material which consists, by preference, of cocoa fibre. The barrel is made
with slots or perforations through which the water passing through the cocoa fibre
finds its way to the central tubular piece and thence to the pipe proceeding to the
boiler. The water entering the vessel 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. The
apparatus is provided with suitable branch pipes and valves.
And in order that our said invention and the manner of performing the same
may be properly understood we hereunto append two sheets of explanatory
drawings, to be hereinafter referred to, and showing a filtering apparatus as made
with our improvements.
Figures, 1, and 2, on Sheet, 1, are respectively an elevation and a vertical
section of the apparatus, as taken at right angles to each other.
Figure, 3, on Sheet, 2, is a horizontal section of the apparatus.
In these drawings the same reference letters and numerals are used to mark the
same or like parts wherever they are repeated.
The improved apparatus is arranged so that the water may pass through it on
its way from the feed pumps to the boiler; and in the modification shown in the
drawings it comprises a vessel, the lower part, A, of which is cylindrical, the upper
part, B, being conical or dome-shaped. Centrally in the lower cylindrical part, A,
of the vessel there is a tubular piece, C, the bottom of which fits into a raised
part, D, of the bottom of the vessel, and is made with a collar, E, to rest thereon.
The bottom of the tubular piece, C, communicates through a space in the
cylindrical part, A, (enclosed by the raised part, D) and a stop valve, G, with the
branch, H, proceeding to the boiler, the upper end being closed by a screw cap, J,
which can be removed for cleaning purposes. The piece, C, is perforated, and on
it there is placed a bobbin-like piece, K, which rests on the collar, E, and is
pressed downwards by the screw cap, J, the barrel of the bobbin-like piece, having
wound or coiled on it the filtering material, L, which may be in the form of matting
or in the form of yarn, strand, or cord, and be wound on to whatever thickness
may be found suitable. The upper end disk of the bobbin-like piece, K, may be
separate so that the action of the screw cap, J, may cause it to compress the
filtering material, L, against the bottom end disk of the bobbin like piece. The
barrel of the bobbin-like piece, K, is made with vertical slots or perforations, M.
through which the water passing through the filtering material, L, finds its way to

page_text: the central tubular piece, C, and thence to the branch or pipe, H, proceeding to
the boiler. The inlet, N, for the water to be filtered is at one side of the vessel,
and it extends upwards with a widening area so that the current may become slower,
and opens into the interior of the vessel at some distance up the side. The water
entering the vessel has not immediate access to the filtering material, L, there being
interposed a shell of thin metal, P, over the outside of which the water spreads
getting to the interior of it by passing under its bottom edge. The shell, P, rests
on the raised part, D, and on lateral projectious, Q, on the inside of the part, A,
near the bottom, and internal projections, R, on the conical part, B, bear on it and
hold it in place. Owing to the comparative slowness of the current within the
vessel there is opportunity for oil or light impurities to rise to the top of the vessel,
whence they may be discharged through a stopcock, S, on the top of the conical
part, B.
And within the shell, P, also light impurities may rise to the upper part
of the shell which is made higher than the filtering parts for the purpose such
impurities passing off through a small hole, T, in the top of the shell, or it might
be through a stopcock, or be removed from the shell periodically.
The apparatus is provided with connecting branch pipes, H, and, N, and with a
by-passage constructed by forming the bottom of the vessel into two valve
boxes, U, and V, fitting a stop valve, U 1, in the partition, V 1, this valve when
open allowing the water to pass from the inlet, N, to the outlet, H, without passing
through the filtering apparatus. One valve box, U, communicates with the inlet to,
and the other with the outlet from the apparatus. The valve, U 2, of the valve
box, U, closes the inlet to the apparatus and the valve, G the outlet from the
apparatus. The apparatus is also provided with a spring controlled relief valve, W,
to prevent excess of internal pressure which might be caused by obstruction. The
vessel is fitted with a bolted-on cover (which comprises the conical part, B) to give
easy access for cleaning and for renewing the filtering material. Two or more
separate filtering vessels may be provided in one arrangement each fitted with inlet
and outlet stop valves so that when one vessel is being cleaned the feed water may
be passed through another or others.
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 :-
1. The construction, arrangement, and combination of parts constituting the
improved filtering apparatus for boiler feed water substantially as herein before
described.
2. Filtering apparatus for boiler feed water, comprising a vessel having in it a
perforated tubular piece closed at one end, and communicating at the other end
with the feed pipe, and having on it a bobbin-like piece with a perforated barrel,
which has cocoa fibre or other filtering material put on it and is encased by a shell
open at the bottom, the parts being arranged and operating substantially as
hereinbefore described.
Dated this Twenty-ninth day of May 1895.
EDMUND HUNT,
Applicants' Agent.