Improvements in Feed Water Filters.
Year: 1899

page_text: Date of Application, 29th June, 1899
Complete Specification Left, 27th Mar., 1900-Accepted, 29th June, 1900
PROVISIONAL SPECIFICATION,
Improvements in Feed Water Filters.
I, ARTHUR DODGSON, Commander Royal Navy, of Palace Mansions, Buckingham
Gate, London, W., do hereby declare the nature of this invention to be as
follows:
-
This invention has for its object to provide a simple, inexpensive and efficient
feed water filter, especially applicable for marine purposes, and the parts of
which are readily accessible for cleaning and renewal.
The improved feed water filter comprises an outer chest or casing which is
adapted to be laid lengthwise in a compact position along the feed pipe and
which contains three perforated dome-like traps of brass or other metal nested one
within the other but separated by webs on each to such an extent as to leave
ample space for collecting sedimentary matter. Fitted within each trap is a
layer of fabric or other filtering medium to strain the feed water and arrest oil or
sediment therein, the strata of straining material being different in each of the
three traps so that the water may pass more readily from that nearest the feed
pump, then through the next and again more readily through the trap nearest the
boiler.
Each of the traps is secured to or formed with an annular flange or rim at
its open end, over which the filter cloths are passed and secured by a binding
wire or cord, and these flanges closely fit the interior of the chest or casing and
lie or bear upon each other, the innermost being bearing against and being
supported by an inwardly projecting flange or rib in the chest whilst the rear-
most is pressed against the others by the rim or flange of a slotted plate or
dome, between which and the cover or removable end of the chest a helical or
other spring may be interposed.
An inlet for the feed water is formed above the slotted plate through which
the water flows and passing through the series of filter traps escapes by an open-
ing in the opposite end of the chest connected to the feed pipe.
The feed pipe is connected through the filter by means of T pieces and a
separate pipe connection to serve as a bye-pass and cocks are provided so that
the filter may be shut off and the feed water directed through the bye-pass.
P T 1899

page_text: manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
This invention has for its object to provide a simple, inexpensive and efficient
feed water filter, especially applicable for marine purposes, and the parts of
which are readily accessible for cleaning and renewal.
The invention is illustrated by the accompanying drawings, Figure 1 being a
longitudinal vertical section, and Figure 2 a transverse vertical section on the
linear, Fig. 1.
The improved feed water filter comprises an outer chest or casing A which is
adapted to be laid lengthwise, as shewn at Fig. 1, in a compact position along
the feed pipe B and which contains three perforated dome-like traps C of cage-
like formation and made of brass or other metal nested one within the other but
separated by webs C¹ on each to such an extent as to leave ample space for col-
lecting sedimentary matter. Fitted within each trap C is a layer D) of fabric or
other filtering medium to strain the feed water and arrest oil or sediment therein,
the strata of straining material being different in each of the three traps so
that the water may pass more readily from that fabric nearest the feed pump,
and which fabric may be of flannel, then through the next fabric, which may
be of coir, and again more readily through the fabric within the trap C nearest
the boiler, and which fabric may be of ordinary filter cloth.
Each of the traps C is secured to or formed with an annular flange or rim C²
at its open end, over which the filter cloths D are passed and secured by a
binding wire or cord E, and these flanges C3 closely fit the interior of the chest
or casing A and lie or bear upon each other, the innermost bearing against and
being supported by an inwardly projecting flange or rib A¹ in the chest A whilst
the rearmost is pressed against the others by the rim or flange of a slotted plate
or dome F, between which and the cover or removable end A2 of the chest A a
helical or other spring G may be interposed.
An inlet A3 for the feed water is formed above the slotted plate F through
which the water flows and passing through the series of filter traps C escapes
by an opening A in the opposite end of the chest connected to the feed pipe B.
The feed pipe B is connected through the filter by means of T pieces and a
separate pipe connection B' to serve as a bye-pass and cocks B2, B3, B4, are pro-
vided so that the filter A may be shut off by closing the cocks B2, B³, and the
feed water directed, by opening the cock B, through the bye-pass B¹.
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. A feed water filter the parts of which are constructed and combined, sub-
stantially as described.
2. In a feed water filter the combination with a filter casing of a series of
perforated dome-like traps nested one within the other and covered upon their
inner surfaces with filtering media, these traps having on their outer surfaces
longitudinal webs which separate each from its neighbour and, at their open
ends, flanges which rest upon and provide a rest for their inner and outer neigh-
bours, the whole being supported by a. flange or rib on the filter casing against
which the nest is pressed, substantially as and for the purpose set forth.
Dated this 26th day of March 1900.
WALLACE FAIRWEATHER,
Of the Firm of Cruikshank & Fairweather,
Chartered Patent Agents,
62, Saint Vincent Street, Glasgow, Agent for the Applicant.