Improvements in Feed-water Purifiers for Steam Boilers.
Year: 1890

page_text: COMPLETE SPECIFICATION.
Improvements in Feed-water Purifiers for Steam Boilers.
I, CHARLES ALBERT KNIGHT of 107 Hope Street, in the City of Glasgow, 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 :-
This Invention relates to feed-water purifiers of the type in which the feed
pipe is carried into a precipitating tube placed within the water and steam space or
drum of the boiler and from which tube the feed water is discharged at or near the
normal water level; and the invention consists of improvements in the construction
and arrangement of such purifiers whereby greater efficiency is obtained.
In the accompanying drawings figure 1 is a longitudinal vertical section, figure 2
is a horizontal section and figure is a cross section of a boiler drum showing a
modification of the improved feed-water purifier applied thereto. Figure 4 is a
vertical section, figure 5 a horizontal section and figure 6 a cross section of
a modified form of the purifier within a drum whilst figures 7 and 8 are enlarged
views showing in detail the formation of the purifier and the manner of securing it in
place.
Referring to figures 1 to 4 the purifier consists of a precipitating tube A which is
suspended by means of straps & secured to the interior of the drum B so as to lie at
an inclination therein. This tube is closed at both ends and through its upper part
is led the feed pipe or a pipe C constituting a continuation of the feed pipe, said
pipe Cheing carried within the precipitating tube nearly to the far end of the latter
and terminating in a flaring outlet so that impurities in the feed-water may not tend
to obstruct the discharge orifice. At or near the upper end of the inclined
precipitating tube A orifices a, which may or may not be provided with nozzles, are
formed for the discharge into the drum of the feed water which flows downwards
through the pipe and returns up the inclined precipitating tube A to said orifices.
These orifices which are situated over the normal water level of the drum also serve
for admission of steam from the drum for blowing off sludge from the precipitating
tube, the sludge, which deposits in the bottom of the tube A, being carried off by a
pipe I connected to the lowest available point of the said tube A, the pipe D being
provided with a blow off cock.
In order to provide facilities for cleaning out deposits or incrustations formed on
the internal surface of the precipitating tube A, the said tube is made up of short
lengths several of which are split longitudinally so that they may be opened up or
removed to give access to the interior. These split lengths may be binged together
s represented at figures 7 and 8 or simply fitted together and clamped or secured at
heir flange joints to the uncut piping.
In the modification of the invention represented in figures 4, 5 and 6 the
recipitating tube A, and feed pipe Care doubled to the form of the letter U in order
hat a greater length of piping may be introduced into the drum. The inclination
f the pipes from end to end is maintained throughout and the method of providing
ccess to the interior by using split lengths of piping is employed whilst the con-
ections to the feed and for blowing off sludge are also similar to those provided in
he modification first describe !.
Having now particularly described and ascertained the nature of the said
vention and in what manner the same is to be performed I declare that what
claim is :-
1. A feed-water purifier constructed as set forth and arranged to lie at an
clination within the boiler drum substantially as hereinbefore described with
ference to the annexed drawings

page_text: 2. In a feed water purifier of the class set forth a precipitating pipe composed of
lengths one or several of which are split or otherwise made to open up so as to
provide access to the interior of the pipe substantially as described.
Dated this Twenty-seventh day of January 1890.
CRUIKSHANK & FAIRWEATHER,
62, Saint Vincent Street, Glasgow, Agents.