Improvements in or relating to Steam Boilers.
Year: 1891

page_text: Date of Application, 19th June, 1891
Complete Specification Left, 19th Mar., 1892-Accepted, 23rd Apr., 1892
PROVISIONAL SPECIFICATION.
Improvements in or relating to Steam Boilers.
I, JOHN EDWARD GRESTY of The Park Eccles in the County of Lancaster
Student of Chemistry do hereby declare the nature of this invention to be as
follows:
This invention relates principally to water tube steam boilers, but is also
applicable to other forms of steam boilers, and consists in the employment either
of single tubes arranged so that the flame from furnace passing from the under side
round the rear ends of tubes is conducted along the upper or opposite side of said
tubes, or of a series of double tubes, arranged so as to encircle the furnace which
may be placed in any position most suitable to the form of boiler to which my
invention may be applied, said double tubes being constructed in the manner
similar to that described in the Specification of Patent No. 2661 of 1865 by
forming an outer tube which is closed at one end and open at the other, and
inserting therein an inner tube of smaller diameter that is open at both ends,
and with a space between the inner and outer tubes for purposes herein after
described.
The object of this invention is to secure better combustion of the fuel, to
prevent the production of smoke, to secure an efficient use of the radiated heat
from the fuel while in combustion for the production of steam instead of being
wasted through brick walled furnaces, and to secure economy in the use of fuel.
In applying my invention to a boiler of the Babcock and Wilcox construction,
I place above, on either side, and underneath the furnace in a longitudinal
direction a series of bottle shaped tubes, or tubes in which one of the ends is closed
and the other end open; the open ends of said tubes are attached to, and terminate
in a steam and water box, the closed rear ends extending into the combustion
chamber said steam and water box may be either semicircular or of other
preferred form.
Within each of said bottle shaped tubes I place a tube of smaller diameter
extending at their rear ends to within a short distance of the closed ends of the
aforesaid bottle shaped tubes, and the front ends extending beyond the open ends
of the bottle shaped tubes, are passed through the steam and water box, and
terminate in and are connected to a water box, slab or tube.
1 close the spaces between the tubes surrounding furnace on the side opposite to
the fire, by means of suitably shaped fire bricks in order to confine and direct the
hot gases along said tubes on the inner or furnace side, into the combustion
chamber, where they pass around the closed ends of the aforesaid tubes, from
whence they are deflected and directed by the fire bridge over the sides of the
tubes furthest from the furnace, and passing in an upward or forward direction
circulate through the inclined water tubes forming boiler.
I place beneath the ordinary fire bars of furnace preferably in a longitudinal
direction, a convenient number of tubes the front ends of which I connect to the
aforesaid water box or slab and the rear ends of said tubes to a mud drum placed
at rear end of boiler..
If in addition to the hereinbefore described double tubes extending over and
around furnace, a row of like tubes are used under the furnace, I place the tubes
connecting mud drum with the front water box either on each side of furnace, or in
other convenient position.
I connect the upper part of steam and water box to a steam and water drum
placed above the series or nest of inclined tubes which form the boiler, by the use

page_text: either of vertical tubes or by a header or slab to which the front ends of aforesaid
inclined tubes forming boiler are attached or connected.
By these means the circulation is carried from the rear end of boiler along the
tubes connecting the mud drum with the bottom part of water box or slab, entering
therefrom into the tubes that are placed within the bottle shaped tubes, extending
over and on each side of furnace, passing from thence into the closed or rear end
of said tubes, and returning along the space that is formed between the inner and
outer tubes into the steam and water box at front of boiler, and from thence either
through the aforesaid vertical tubes or through the header or slab into the upper
steam and water drum.
In a modification of my invention, I place double tubes such as herein before
described in an inclined position over furnace. I also place single tubes terminating
in a header arranged so that the flame is conducted along the under side of said
tubes and carried back over the reverse side.
Dated this 18th day of June 1801
THOMAS PRESCOTT,
53, Arcade Chambers, St. Mary's Gate, Manchester,
Agent for Applicant.
COMPLETE SPECIFICATION.
Improvements in or relating to Steam Boilers.
I, JOHN EDWARD GRESTY of The Park Eccles in the County of Lancaster
Student of Chemistry 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 principally to water tube steam boilers, but is also
applicable to other forms of steam boilers, and consists in the employment either
of single tubes arranged so that the flame from furnace passing round from the
under side round the rear ends of tubes is conducted along the upper or opposite
side of said tubes or of a series of double tubes arranged so as to encircle the
furnace in any position most suitable to the form of boiler to which my invention
may be applied, said double tubes being constructed in the manner similar to that
described in the Specification of the Patent No. 2661 of 1865 by forming an outer
tube which is closed at one end and open at the other and inserting therein an inner
tube of smaller diameter that is open at both ends, and with a space between said
inner and outer tubes for purposes hereinafter described.
The objects of this invention are to secure better combustion of the fuel, to
prevent the production of smoke, to secure an efficient use of the radiated heat
from the fuel while in combustion for the production of steam instead of being
wasted through brick walled furnaces, and to secure economy in the use of fuel.
I attain these objects by the means hereinafter described and as illustrated in
the accompanying sheets of drawings. In the several views shown therein similar
letters refer to similar parts.
Fig. 1. represents an end view and Fig. 2 a longitudinal section on line C. D. of
a boiler constructed according to this invention and as is hereinafter described.
In these views 1 have shown my invention applied to a boiler of the ordinary
water tube type a series of the aforesaid double tubes being placed above and on
either side of the furnace a in a longitudinal direction. This series of double
tubes are shown bottle shaped, or tubes in which one of the ends b' is closed and
the other end 62 is open the open ends 12 of said tubes are attached to and
terminate in a steam and water box e, the closed rear ends 'extending into the
combustion chamber f. I attach the tubes b to the steam and water box e by
carrying the open ends 2 through steam and water box and attaching said open
ends to the plate e' thereby obtaining additional security and support, but in order
that the circulation may not be altered or affected thereby and may continue the

page_text: same as if said open ends of tubes were attached to the back plate e² of the steam
and water box e, I form apertures 63 in those portions of the tubes that are within
the box e.
Within each of said bottle shaped tubes 6 I place a tube g as shown in Fig. 3.
which represents the tube and part of the water box e drawn to an enlarged
scale. The tube g is of a smaller diameter than the internal diameter of the
tube b so as to form a space between the outside of the tube g and the inside of
the tube b; said tube 9 extends at its rear end g¹ to within a short distance of each
of the closed ends b¹ of the aforesaid bottle shaped tubes ; the front ends g' are
passed through the steam and water box e and extending beyond the apertures b³.
of the bottle shaped tubes, terminate in and are connected to the water box or
slabe by means of the neck j which is taper shape and inserted and pressed into
the end of the tube that is attached to the plate e' of water box as herein before
described.
I construct the steam and water box e either of the shape shown on drawings, or
circular, semicircular or other preferred form.
I close the spaces between the outer row of tubes surrounding furnace by
means of suitably shaped firebricks as shown in Fig. 4. in order to confine and
direct the hot gases along said tubes on the inner or furnace side, into the com-
bustion chamber f, where they pass around the closed ends of the aforesaid
tubes b, from whence they are deflected and directed by the fire bridge l¹ over the
sides of the tubes furthest from the furnace, and passing in an upward or forward
direction circulate through the inclined water tubes forming boiler.
I place beneath the ordinary fire bars of furnace in a longitudinal direction as
shown in Fig. 2 a convenient number of tubes h, the front ends of which I connect
to the aforesaid water box or slab e and the rear ends of said tubes to a mud drum /¹
placed at rear end of boiler.
I connect the upper part of steam and water box e to a steam and water drum/
placed above the series or nest of inclined tubes m which form the boiler by the
use either of vertical tubes or by a slab, or by headers as shown on drawings to
which the front ends of aforesaid inclined tubes m forming boiler are attached or
connected. By these means the circulation is carried from the rear end of boiler
along the tubes h connecting the mud drum h¹ with the bottom part of water box
or slabe entering therefrom into the tubes g that are placed within the bottle
shaped tubes extending over and on each side of furnace, passing from thence
into the closed or rear ends of tubes b, and returning along the space that is
formed between the inner and outer tubes into the steam and water box e at front
of boiler and from thence either through the aforesaid vertical tubes, or slabs, or
through the headers p, into the steam and water drum 1.
If in addition to the hereinbefore described double tubes extending over and
around furnace, a row of like tubes are used under the furnace so as to entirely
encase the furnace I place the tubes h connecting mud drum with the front water
box e either on each side of furnace or in other convenient position.
Fig. 5 represents a series of single tubes 6 placed in a longitudinal position over
and on each side of furnace a, and may also be placed underneath said furnace if
desired terminating in a header 66, the spaces between the outer sides of said
tubes being closed by suitably shaped fire bricks in the manner herein before
described.
Fig. 6 represents a series of single tubes placed transversely around furnace
with their ends connected to a header 6' placed over centre of furnace the spaces
on outer sides of said tubes being filled in with firebricks as herein before
described. The central header and the end tubes of the series nearest the com-
bustion chamber fare also encased with firebrick.
To assist secondary combustion I form openings
combustion chamber, or the fire bridge through which
mix with the gases and the flame from the furnace.
in the firebricks forming
hot air may be passed to

page_text: Having now particularly described and ascertained the nature of this my said
invention and in what manner the same is to be performed I declare that what I
claim is :-
1st. In water tube or other forms of steam boilers, the use of a series of double
tubes similar in form to the tubes described in the Specification of the Patent
No. 2661 of 1865 placed in a longitudinal direction over or surrounding the
furnace with their front ends connected to a water box, slab or header and their
rear ends extending into a combustion chamber, formed between the ends of tubes
and fire brick wall, the spaces between the outer sides of said tubes being filled
in with suitably shaped firebricks in order that the flames from the furnace inay be
caused to pass along the under or inner side, round the rear ends of said tubes and
return along the opposite sides thereof in the manner and for the purpose substan-
tially as herein before described.
2nd. In a water tube or other form of steam boiler the use of a series of single
tubes placed in a longitudinal direction over or surrounding the furnace with their
front ends connected to a water box, slab or header, and their rear ends extending
into a combustion chamber and connected to a header of any convenient shape,
the spaces between the outer sides of said tubes being filled in with suitably shaped
fire bricks, in order that the flames from the furnace may be caused to pass along
the under or inner side round the rear ends of said tubes, and return along the
opposite sides thereof for the purpose and in the manner substantially as herein
before described.
3rd. In a water tube or other form of steam boiler, the use of tubes placed
either transversely with their ends terminating in a header, or in other preferred
positions, said tubes extending into the combustion chamber and arranged so that
the flames from the furnace shall pass along the underside and round the rear
portion of said tubes and along the opposite side thereof in the manner and for the
purpose substantially as herein before described.
Dated this 18th day of March 1892.
THOMAS
PRESCOTT,
53, Arcade Chambers, St. Mary's Gate, Manchester,
Agent for Applicant.