Improvements in or relating to Internal Feed Water Heaters for Steam Generators, applicable also to Internal Feed Pipes and the like.
Year: 1894

page_text: Date of Application, 15th June, 1894
Complete Specification Left, 15th Mar., 1895-Accepted, 20th Apr., 1895
PROVISIONAL SPECIFICATION.
Improvements in or relating to Internal Feed Water Heaters for
Steam Generators, applicable also to Internal Feed Pipes and
the like.
We, DANIEL ARTHUR QUIGGIN, and THE LIVERPOOL ENGINEERING AND
CONDENSER COMPANY, LIMITED, both Engineers, of 21 Brasenose Road,
Liverpool in the County of Lancaster, do hereby declare the nature of this
invention to be as follows:-
The object of this invention is to obviate certain difficulties which are experienced
in connection with internal feed water heaters and internal feed pipes of steam
generators. It is found in such apparatus, especially when the pressures are high
and the internal pipes or passages are of considerable length or capacity, that the
pipes and their connections are subjected to very severe and destructive stresses,
and extreme difficulty is experienced in keeping them sound. It is probable that
the said stresses are due to the impact of the column of water in the internal pipes
which, after each stroke of the feed pump, is driven back by the boiler pressure
until arrested by the closing of the feed check valve; the latter valve is usually
placed as close as possible to the boiler and the action is found to be most
destructive near this valve, where the column is longer than elsewhere. Our
present invention is specially applicable to that class of feed water heater described
in the Specification to Letters Patent granted to John Newton and Daniel Arthur
Quiggin, dated 1st May, 1889 and numbered 7251, and we will describe our
invention as applied to such apparatus.
We place
on the pipe connecting the feed check valve to the feed heater, and as
near the former as possible, one or more air vessels which, in virtue of the
cushioning effect, serve to greatly reduce the water-hammer effect already
referred to.
We also find, in feed water heaters of this class, that the apparatus is much
more durable when the joints between the heat transmitting passages and the outlet
and the inlet boxes are made after the manner described in the Specification to
Letters Patent granted to the aforesaid John Newton and Daniel Arthur Quiggin,
dated 21st April, 1890, and numbered 5992; in applying this form of joint
according to our present invention we curve the tubes forming the heat transmitting
passages so as to admit of the necessary longitudinal elasticity required to form the
joints. We also find it necessary to lead the outlet pipe from the top of the
apparatus so as to ensure its being full of water in event of the feed water being
cut off.
Dated this 14th day of June 1894.
SLOAN & LLOYD BARNES,
Castle Chambers, 26, Castle Street, Liverpool,
Agents for the Applicants.

page_text: COMPLETE SPECIFICATION.
Improvements in or relating to Internal Feed Water Heaters for
Steam Generators, applicable also to Internal Feed Pipes and
the like.
We, DANIEL ARTHUR QUIGGIN, and THE LIVERPOOL ENGINEERING, AND
CONDENSER COMPANY LIMITED, both Engineers, of 21 Brasenose Road,
Liverpool in the County of Lancaster, 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 :-
The object of this invention is to obviate certain difficulties which are experienced
in connection with internal feed water heaters and internal feed pipes of steam
generators. It is found in such apparatus, especially when the pressures are high
and the internal pipes or passages are of considerable length or capacity, that the
pipes and their connections are subjected to very severe and destructive stresses,
and extreme difficulty is experienced in keeping them sound. It is probable that
the said stresses are due to the impact of the column of water in the internal pipes
which, after each stroke of the feed pump, driven back by the boiler pressure
until arrested by the closing of the feed check valve; the latter valve is usually
placed as close as possible to the boiler and the action is found to be most
destructive near this valve, where the column is longer than elsewhere. Our
present invention is specially applicable to that class of feed water heater described
in the Specification to Letters Patent granted to John Newton and Daniel Arthur
Quiggin, dated 1st May, 1889 and numbered 7251, and we will describe our
invention as applied to such apparatus.
We place on the pipe connecting the feed check valve to the feed heater, and as
near to the former as possible, one or more air vessels which, in virtue of the
cushioning effect, serve to greatly reduce the water-hammer effect already
referred to.
We also find, in feed water heaters of this class, that the apparatus is much
more durable when the joints between the heat transmitting passages and the outlet
and the inlet boxes are made after the manner described in the Specification to
Letters Patent granted to the aforesaid John Newton and Daniel Arthur Quiggin,
dated 21st April, 1890, and numbered 5992; in applying this form of joint
according to our present invention we curve the tubes forming the heat transmitting
passages so as to admit of the necessary longitudinal elasticity required to form the
joints. We also find it necessary to lead the outlet pipe from the top of the
apparatus so as to ensure its being full of water in event of the feed water being
cut off.
We have illustrated our invention by the accompanying drawings in which ;-
Fig. I is an elevation and Fig. If an end elevation of the general arrangement,
the shell of the boiler being partly broken away in each view to more clearly show
the feed heater, and
Figs. I to VIII are detail views which will be more fully explained
hereinafter.
Throughout, the drawings, similar parts are indicated by the same reference
figures, and in the case of sections, the direction in which they are viewed is
indicated by the small arrows placed adjacent to the letters denoting the plane of
section.
1 is the boiler, of which only sufficient is shown to make clear the relation of the
feed water heater and air vessel thereto.
The main feed enters by the check valve 2 and passes through the air vessel 3,
placed as close as possible to the check valve, being preferably secured by the same

page_text: bolts as the latter; this air vessel is shown in section to larger scale in Figs. V
and VI, the latter view being a section on the line C. C. of Fig. V; a modified
form of air vessel 3* is shown in Figs. VII and VIII, which are analogous views
to Figs. V and VI, the section for Fig. VIII being taken on the line D. D. of
Fig. VII.
From the air vessel, the feed water passes through the inlet pipe 4 to the inlet
box 5 and thence through the heat transmitting passages 6 to the outlet box 7,.
being heated by the heat transmitted from the steam, and finally passes to the
lower part of the boiler through the outlet pipe 8, which is taken from the top of
the box as shown to prevent the apparatus from being emptied when the feed is
cut off.
The additional check valve 21, air vessel 3' and inlet pipe 4' shown in Fig. II,
are for the auxiliary feed.
The inlet box 5, the outlet box 7 and the connecting tubes are shown to larger
scale in Figs. III and IV, Fig. III being a sectional elevation on the line A. A. of
Fig. IV, and Fig. IV-being a plan of the inlet box only, partly in section on the
line B. B. of Fig. III.
In Fig. III the inlet and outlet boxes are, to save space, brought closer together
than shown in Fig. I and the connecting tubes are broken off.
9 is a washer screwed tightly into the box, the hole in the washer being
preferably made square to facilitate screwing it in. 10 is a washer secured to the
end of the heat transmitting passage 6, and adapted to make joint with the face of
the washer 9, the abutting surfaces being concentrically corrugated in accordance
with the method described in the Specification to the aforesaid Letters Patent
No. 5992 of 1890; the necessary pressure to make the joint is applied by the
elongated loose flanges 11 and the studs shown.
The tubes 6 are bowed slightly to give them longitudinal elasticity, to facilitate
the screwing up of the joints. The apparatus usually rests upon or is slung from
the boiler stays 12 being held in position by the hooks 13.
It is to be understood that we make no broad claim herein to internal feed water
heaters of the class described, as such heaters were described and claimed in the
aforesaid Letters Patent No. 7251 of 1889.
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 use, in combination with an internal feed water heater, of an air vesse!
placed within the boiler between the feed check valve and the feed heater to formi
an air cushion; substantially as described and illustrated.
2. In combination, a steam boiler; a feed water heater placed within the boiler
and consisting of an inlet pipe, inlet and outlet boxes connected by a series of heating
passages, and an outlet pipe; and an internal air vessel connected with the inlet pipe
and forming an air cushion; substantially as described and illustrated.
3. The combination and arrangement of parts forming the improved feed water
heater, substantially as described and illustrated.
Dated this 14th day of March 1895.
SLOAN & LLOYD BARNES,
Castle Chambers, 26, Castle Street, Liverpool,
Agents for the Applicants.
SLOAN & LLOYD BARNES,
Castle Chambers, 26, Castle Street, Liverpool,
Agents for the Applicants.