Improvements in Apparatus for Heating Feed-water for Steam Boilers and the like.
Year: 1889

page_text: Date of Application, 1st May, 1889
Complete Specification Left, 1st Feb., 1890-Accepted, 1st Mar., 1890
INIŪNAD
Improvements in Apparatus for Heating Feed-water for Steam
Boilers and the like.
We, JOHN NEWTON of 79 Mark Lane in the city of London in the county of
Middlesex, Merchant, and DANIEL ARTHUR QUIGGIN of 28 Chapel Street, Liverpool,
in the county of Lancaster, Engineer, do hereby declare the nature of this invention
to be as follows.
Our present invention relates to that class of apparatus for heating feed water for
steam boilers and the like, in which the feed-water, before its final delivery, is caused
to traverse heating passages placed in the steam space of the boiler, so that the feed
water is raised to, or nearly to, the temperature of the water in the boiler before mixing
therewith
By so heating the feed water, the well-known prejudicial effects of cold feed water
are obviated and if the heated feed water be delivered at or near the lowest part of an
internally fired boiler, where the temperature is usually low, the displacement of this
low temperature water by the hot feed water will promote circulation.
We construct such apparatus as follows
We lead the feed pipe into the steam boiler through a suitable check valve placed
many convenient position on the shell of the boiler The feed pipe is then led up
within the boiler and enters a box of cast iron or other suitable material, hereinafter
called the inlet box, which may be supported from the boiler shell and is preferably
placed about or above the water level, or if preferred the internal feed pipe connecting
the teed check valve to the inlet box may be dispensed with, the latter being fixed
within the boiler adjacent to the feed check valve
A number of tubes having a large heating surface in proportion to their cross-
sectional area and forming heating passages are led from the inlet box through the
steam space of the boiler to a second box, herein-after called the outlet box, similar to
the inlet box and placed also by preference about or above the water level.
From this outlet box a pipe which may be termed the delivery pipe is led to the
lower part of the boiler where the water is usually at a low temperature, or to any
other part at which it is desired to deliver the feed water.
The combined cross sectional area of the heating passages should be not less than
the cross sectional area of the feed pipe.
The feed water enters the boiler by the check valve, ascends the internal feed pipe,
if one is fitted, enters the inlet box, traverses the heating passages, so being divided
into a number of fine streams and raised nearly to the temperature of the steam by
which the heating passages are surrounded, then enters the outlet box and finally
descends the delivery pipe and mixes with the water in the boiler.
The heating passages may be disposed in any convenient manner between the inlet
and outlet boxes and for convenience of entering them through the man-hole they
may be made in two or more lengths, the junctions being made by flanges, unions or
by intermediate boxes similar to the inlet and outlet boxes
The heating passages may be placed circumferentially close to the shell of the boiler
or they may run parallel or transverse to the axis of the boiler, and where great
length of heating passages is required, they may be arranged as zig-zags, and
an intermediate box may be placed at each bend or return of the zig-zag.
The heating passages consist of steel, copper, brass or other suitable tubing and
their cross section may be of circular, flattened, elliptical, oval, or crescent form, the
object being to provide a large heating surface relatively to the cross sectional
area and if desired the cross sectional area may increase slightly towards the
outlet and

page_text: The heating passages may be attached to the boxes in various ways Their ends
may be left round, each being threaded and provided with a nut, the outside of which
is threaded with a thread of slightly coai ser pitch and screwed into an opening in the
box so that the end of the heating passage will be forced against a flat or mitred
facing in the box to make a steam tight connection Or the end of each heating
passage may be fitted with a flange, screwed, brazed or otherwise secured thereto,
the said flange being bolted to the box; or the box may be provided with a cover of
cast iron, brass, gunmetal or other cast metal into which the end of each heating
passage is cast, or the ends may be simply fitted tightly and expanded, after the
manner of fixing ordinary boiler tubes
The opening in the inlet box communicating with each heating passage is preferably
constricted so as to have an area not greater than the minimum cross sectional area
of the heating passage. The inlet and outlet boxes may be so constructed as to
arrest sediment and grease during the passage of the feed water, and the boxes are
provided with test and blow-off or drain pyes and cocks leading to the outside of the
boiler.
Dated this 29th day of April 1889
SLOAN & LLOYD BARNES,
26, Castle Street, Liverpool, Agents for the Applicants.
COMPLETE SPECIFICATION
Improvements in Apparatus for Heating Feed-water for Steam
Boilers and the like.
We JOHN NEWTON, of 79 Mark Lane, in the city of London, in the county of
Middlesex, Merchant, and DANIEL ARTHUR QUIGGIN, formerly of 28 Chapel Street,
but now of 19 Brasenose Road, Liverpool, in the County of Lancaster, 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:-
Our present invention relates to that class of apparatus for heating feed water for
steam boilers and the like, in which the feed water, before its final delivery, is caused
to traverse heating passages placed in the steam space of the boiler, so that the feed
water is raised to, or nearly to, the temperature of the water in the boiler before
mixing therewith
By so heating the feed water, the well known prejudicial effects of cold feed water
are obviated and if the heated feed water he delivered at or near the lowest part of an
internally fired boiler, where the temperature is usually comparatively low, the
displacement of this comparatively low temperature water by the hot feed water will
promote circulation.
We construct such apparatus as follows, reference being made to the accompanying
drawings, in which Fig I shows in elevation our apparatus fitted in a two-flued
single-ended tubular boiler, the shell, furnaces, tubes and stayrods thereof being shown
in section. Fig. II is an elevation of the apparatus, the boiler shell being in section;
Fig III is a plan, the boiler not being shown Figs IV, V and VI are corresponding
views of a modified form of the apparatus. Figs VII, VIII, IX and X show various
details.
Throughout the drawings similar parts are indicated by similar reference figures,
and the flow of feed water is indicated by the small arrows adjacent to the pipes
Referring now to Figs I, II and III, we lead the feed pipe 1 into the boiler
through a suitable check valve 2, placed in any convenient position on the boiler
shell 3
The internal feed pipe + is then led up within the boiler and enters a box 5, of cast
iron or other suitable material, which is connected to a second box 6 hereinafter called
the inlet box; these boxes may be supported in any convenient way from the boiler
structure and are shown slung by straps 22 from the stay rods.

page_text: A section through the box 6 on the line A A of Fig 1 is shown to a larger scale in
Fig VIII and will be hereinafter more fully described
A number of tubes 7 having a large heating surface in proportion to their cross-
sectional area, and forming heating passages, are led from the inlet box 6 through the
steam space 8 of the boiler to a second box 9 hereinafter called the outlet box, similar
to the inlet box.
The combined cross-sectional area through the heating passages should be not less
than the cross-sectional area of the feed pipe.
From the outlet box 9, a pipe 10 which may be termed the delivery pipe is led as
shown to the lower part of the boiler where the water is usually at a comparatively
low temperature, or it may be led to any other part at which it is desired to deliver
the heated feed water
"
The heating passages consist of steel, copper, brass or other suitable tubing and
their cross-section may be of flattened, circular, elliptical, oval or crescent form, the
object being to provide a large heating surface relatively to the cross-sectional area,
and if desired, the cross-sectional area may increase slightly towards the outlet end.
The form of cross-section which we term " crescent 13 shown in Fig. X and is
similar to that set forth in the Complete Specification of our Patent No. 15229 of
1888 in connection with tubular worms In the case of this cross-section, the increase
of area towards the outlet end, herein before referred to, is obtained by reducing the
degree of indentation towards that end. The form of section shown in Figs. I, II
III, IV, V and VI is the flattened form, shown to an enlarged scale in Fig. IX
Where found necessary, in order to enter them through the manhole, the heating
passages are made in two or more lengths, the junctions being made by flanges, unions
or intermediate boxes as may be preferred The heating passages may be attached
to the inlet and outlet boxes and to the intermediate boxes, when these are fitted,
in various ways.
Their ends may be fitted with a lugged flange secured thereto
and bolted to the box, or the box may have a cover of cast metal into which the
said ends are cast, or the ends may he simply fitted tightly and expanded after the
manner of bxing ordinary boiler tubes
We prefer, however, to use the methods of attachment shown in Figs VII and VIII,
Fig. VII is a section showing the method of attachment of the heating passages to
the outlet box, and Fig VIII is a sectional plan on the line A A of Fig. I, showing
the method of attachment to the inlet box
The inlet box has openings 11 communicating with the heating passages 7. The
ends 12 of the heating passages are left round and are threaded externally and fitted
with a ferrule or nut 1 threaded internally and externally These nuts 13 screw into
the openings 11, the external thread being of slightly coarser pitch than the internal
thread.
The opposite ends 14 of the heating passages are provided, as shown in Fig. VII,
with a freely fitting nut 15 which bears against a colla 16 secured to the end 14; the
opening in the outlet box 9 13 threaded to receive the nut 15 and by this means a fluid
tight joint can be made against the washer 24 of lead or other soft material.
The ends 14 being secured in place, the nuts 13 are screwed into the openings 11
so as to make a fluid-tight joint against the washer 17.
The arrangements described, permit staunch joints to be made although the heating
passages may differ slightly in length.
The openings 11 are preferably constricted, as shown in Fig VIII so as to have an
area not greater than the minimum cross-sectional area of the heating passage.
The inlet box 6 may be so constructed as to arrest sediment and grease during the
passage of the feed water, and it is provided with a blow-off or drain pipe 18 which
is led to the cock 19 placed conveniently on the boiler shell.
The box 5 is fitted with a sinall air pipe 20 leading to a cock 21, and is intended to
offer an escape for any air that may enter with the feed water.
Referring now to Figs. IV, V and VI which show a modified form of the apparatus
the heating passages here are arranged in two lengths in order to obtain a longer
path for the feed water.'

page_text: The return junction between the lengths is formed by the intermediate boxes 23;
the box 5 is now dispensed with, but the arrangement is in other respects similar to
that already described
Should a still longer path for the teed water be desired, additional lengths may be
added so forming a zig-zag arrangement of heating passages.
The heating passages are not necessarily placed as shown in the drawings For
instance the inlet and outlet boxes may be placed close to the cylindrical shell on
opposite sides of the boiler, the heating passages then running cu cumferentially, and
in this arrangement, if desired, the internal feed pipe may be dispensed with, the inlet
box being placed close to the feed check valve.
The action of the apparatus is as follows
-
The feed water enters the boiler by the check valve, ascends the internal feed pipe,
if one is fitted, enters the inlet box, traverses the heating passages, so being divided
into a number of fine streams and raised nearly to the temperature of the steam by
which the heating passages are surrounded, then enters the outlet box and finally
descends the delivery pipe and mixes with the water in the boiler
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is
-
1. In apparatus for heating feed water for steam boilers and the like, the combi-
nation of an inlet box, an outlet box, a number of heating passages of flattened,
crescent, elliptical, oval or the like cross-section connecting said feed boxes, and
through which the feed water flows in a number of thin streams, and a delivery
pipe, all being placed within the boiler, substantially as and for the purposes set
forth.
2 In apparatus for heating feed water for steam boilers and the like, the combi-
nation of an inlet box, an outlet box, a number of heating passages of flattened,
crescent, elliptical, oval or the like cross-section connecting said boxes, and a delivery
pipe, all being placed within the boiler and the heating passages being arranged in
two or more lengths so as to form a zig-zag, substantially as and for the purposes
described.
3. In apparatus for heating feed water for steam boilers and the like, the combi-
nation of an inlet box, an outlet box, a number of heating passages of flattened,
crescent, elliptical, oval or the like cross-section connecting said boxes and a delivery
pipe, all being placed within the boiler, and the heating passages running parallel
to the circumference of the boiler shell, substantially as and for the purposes
described.
4. The improved apparatus for heating feed water for steam boilers and the like,
substantially as described and illustrated in Figs. I, II, III, VII, VIII and IX.
5 The improved apparatus for heating feed water for steam boilers and the like
substantially as described and illustrated in Figs. IV, V and VI.
Dated the 21st of January 1800
SLOAN & LLOYD BARNES,
Castle Chambers, Castle Street, Liverpool, Agents for the Applicants.