Improvements in and relating to Steam Generators.
Year: 1895

page_text: Date of Application, 8th Oct., 1895
Complete Specification Left, 8th July, 1896-Accepted, 26th Sept., 1896
PROVISIONAL SPECIFICATION.
Improvements in and relating to Steam Generators.
I, JOHN EDWARD GRESTY, Estate Buildings, Huddersfield, in the County of
York, Engineer, do hereby declare the nature of this invention to be as follows:-
The improvements which form the subject of this invention relate to steam
generators principally of the water tube type in the formation of headers, water
boxes, water tubes and connecting parts the forming and fixing same to obtain
high efficiency and high economy.
In water cased furnaces the tubes which form the wall or casing may have one
or both ends of less diameter than the body of the tube so that the bodies of several
tubes come close to each other and form a wall or casing to the fire flame or gases
or the tubes may have ribs or flanges on them of sufficient width or size to cover
the spaces between one tube and another to form a wall or casing to the furnace
flame or gases these form good heating surfaces and secure better combustion than
results from the use of water tubes without such ribs or flanges. Tubes with ribs
Water tubes
or flanges may be used for baffles to direct the course of the gases.
with ribs on which ribs are perforated may be used to serve as a fire grate in
lieu of fire bars, the perforations in the ribs to allow air to pass through to the
fire.
Dated this Seventh day of October 1895.
COMPLETE SPECIFICATION.
Improvements in and relating to Steam Generators.
I, JOHN EDWARD GRESTY, of Estate Buildings, Huddersfield, in the County of
York, Engineer and Chemist, 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 improvements which form the subject of this invention relate to steam
generators principally of the water tube type in the formation of water tubes and
connecting parts and forming and fixing same to attain high efficiency and high
economy.
In water cased furnaces the tubes which form the wall or casing may have one
or both ends of less diameter than the body of the tube so that the bodies of several
tubes come close to each other and form a wall or casing to the fire flame or gases,
or the tubes may have ribs or flanges on them of a sufficient size or width to cover
the spaces between one tube and another to form a wall or casing to the furnace
flame or gases, these form good heating surfaces and secure better combustion than
results from the use of water tubes without such ribs or flanges.
Water tubes with perforated ribs may be used to serve as a fire grate in lieu of
fire bars the perforations in the ribs to allow the air to pass through to the
fire.
And in order that my invention may be fully understood and readily carried

page_text: into effect I will describe the accompanying five sheets of drawings reference being
had to the figures and letters marked thereon.
Fig. 1 represents a sectional side elevation of an ordinary type of water tube
boiler to which my improvements are applied and Fig. 2 is a front view partly in
section, of Fig. 1.
Fig. 3 is a sectional side elevation and Fig. 4 a front view, partly in section, of
Fig. 3, of a water tube boiler to which my improvements are applied.
Fig. 5 is a sectional side elevation and Fig. 6 a front view, partly in section, of
another form of water tube boiler to which my improvements are applied.
Fig. 7 is a transverse vertical section of part of a water tube boiler with a double
furnace made according to my invention.
In the drawings,-a is the nest of tubes which forms the main portion of the
boiler, a steam and water drum; c the furnace and d the combustion chamber.
In Figs. 1 and 2 the tubes a are connected to a front header e and a back
header f; these headers being connected to the steam and water drum b by nipples
and by pipes g or their equivalents and to other headers e and f1 by nipples g'; the
top of the furnace is covered with tubes having their ends of reduced diameter
and fitted into boxes which are connected by the headers e and f by pipes g';
the large diameter of the tubes extends from the front of the boiler to a point a
little beyond the end of the fire bars i from where the tubes are reduced again in
diameter. The enlarged portion of the tubes come into contact with one another
and so form a close cover over the fire in the furnace and cause the heated
gases to pass away between the reduced portion of the tubes h at the rear into the
combustion chamber from which they are guided by baffles such as jamong the
nest of tubes a.
In order to economise heat I apply ribbed tubes k to close in the sides of the
furnace and combustion chamber the ribs being placed so as to meet or thereabouts ;
these tubes are connected to the headers e¹ and ƒ³.
In place of the tubes h with reduced ends ribbed tubes could be employed to
cover the furnace; in this case the ribs would extend about as far as the enlarged
portion of the tubes in Fig. 1, the heated gases escaping beyond the ribbed portion
of the tubes into the combustion chamber d.
In Figs. 3 and 4 the nest of tubes a is composed of field tubes so as to avoid the
use of a back header; field tubes h with ribs on their exterior are also shown above
the furnace and there are similar tubes at the sides of the furnace and combustion
chamber; the ribs on the tubes h above the furnace extend about as far as shown
in Fig. 3.
The tubes a are connected to a front header e in communication with the steam
and water drum and the tubes h are connected to a side box h¹ while the tubes k
are connected to a header which is connected to e by nipples g¹.
In Figs. and 6 the nest of tubes a are connected to headers e and which are
in communication with the steam and water drum b. The enlarged tubes h, or it
might be ribbed tubes, which cover the furnace are connected to side boxes hi h
the former being connected by pipes m to the header e while the ribbed side
tubes of the turnace c and combustion chamber d are connected to a front header e¹
connected to the header e and to a back header / which is connected by pipes » to
the back header for to a mud drum in connection therewith.
In Fig. 7 my improvements are shown applied to a double furnace in which
ribbed tubes h or tubes with reduced ends are employed to cover the furnace, and
ribbed tubes k to form sides for the furnace c and combustion chamber d and to
divide the furnace and combustion chamber if desirable.
Water tubes with perforated ribs may be used to serve as a fire grate in lieu of
fire bars the perforations in the ribs allow the air to pass through to the fire.
By my improvements I am enabled to dispense with the fire brick arch over the
furnace and by surrounding or partially surrounding the furnace and the combustion
chamber as described the nascent and radiated heat from the furnace is more
thoroughly utilized to form steam.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
In a water tube boiler-
1. A furnace and a combustion chamber partially separated by water tubes of
two diameters or provided with ribs substantially as herein set forth.
2. The use and application of ribbed tubes for casing in the side walls of the
furnace, and combustion chamber below the nest of ordinary water tubes
substantially as herein set forth.
3. In combination the side walls and top of the furnace formed of ribbed tubes
or tubes of two diameters substantially as herein set forth.
4. The use and application of ribbed tubes with the ribs perforated and arranged
to form fire bars for the furnace substantially as herein set forth.
Dated this 7th day of July 1896.
H. B. BARLOW & GILLETT.
17 St. Ann's Square, Manchester, Agents for Applicant.