Improvements in Gas Furnaces.
Year: 1891

page_text: Date of Application, 10th Dec., 1891
Complete Specification Left, 10th Sept., 1892-Accepted, 15th Oct., 1892
PROVISIONAL SPECIFICATION.
[Communicated from abroad by RICHARD NICKERSON OAKMAN the Younger,
of Greenfield, in the State of Massachusetts, United States of America,
Gentleman.]
Improvements in Gas Furnaces.
I HENRY EDWARD NEWTON of the Office for Patents, 6 Bream's Buildings,
Chancery Lane, in the County of Middlesex, Patent Agent, do hereby declare the
nature of this invention to be as follows
-
This invention relates to a furnace adapted for heating pipes for welding the
longitudinal seam by the combustion of gas and air introduced and burned under
pressure in such manner that the flame shall pass twice, or in a double sheet,
through the furnace, and over the pipe, whereby greater efficiency and economy
of the gaseous fuel is secured; it is also adapted to heating iron or steel in bars or
blooms, for forging or welding; and also adapted for heating the skelp from
which the pipes are rolled, by waste heat from the welding furnace, and also
utilizing the waste products for heating the air which is forced to the burners.
The object of the invention is to provide for more uniformly heating the pipe or
material which is to be welded by the combustion of fuel gas and air under
controlled pressure.
In carrying out this invention, the furnace is constructed with an inwardly pro-
jecting and over-hanging ledge or bridge containing the burner ports and burners,
and a reverberatory or arched crown is provided by means of which the flame is
deflected and made to fold upon itself as it passes out over the rolled-up tubes,
and thus heat a number of tubes throughout their entire length, as it passes_out
through the escape flues or ports arranged under the projecting bridge. The rolled-
up skelps ready for welding are introduced first below the overhanging bridge
or arch below which passes the return current of flame and hot products, and are
advanced successively toward the hottest part of the furnace at the rear side
thereof, until ready to be drawn out and rolled in the well known manner.
The welding furnace is constructed of the usual material, capable of withstanding
a high heat, and is provided with an arched crown extending from end to end
thereof, and down to the hearth at the right hand, or working outside of the
furnace. The side wall is preferably curved and drawn in below the crown of
the furnace, for better deflecting the flame, and causing it to return upon itself.
The left hand side of the furnace, or firing side, is constructed with an inwardly
projecting and overhanging bridge, which may be formed by corbelling the brick-
work, and in such inwardly projecting bridge are formed the row of burner ports.
The metallic burner shells may have contracted nozzles, or the brickwork at the
inner ends of the burners may be formed with short contracted openings leading
into the firing ports, for properly shaping and directing the flames in the furnace
chamber near the top thereof. Below the arch or corbelled bridge, and back of
the burner ports, are formed the outlet ports and flues near the hearth.
The flues may connect directly with the base of a heat-restoring chamber, or
with a reverberatory heating chamber, and such heating chamber is preferably
used for the purpose of heating the skelp by means of the waste products from
In this
the welding furnace, preparatory to rolling such skelp into tubes.
construction, the ends of the flues are bent upward, for directing the flame and
products over the skelp or strips of metal which are laid upon the hearth; the
flame is thus prevented from impinging upon the skelp, and is directed by
the curved roof across to the outlet flues, which are arranged in a row across the

page_text: furnace, and extend downward, and connect with a large flue, which connects with
one end of a heat-restoring chamber, from the other end of which there extends
a stack flue.
The air heating tubes may be composed of coils of pipe, or of U shaped pipes,
suspended in the heating chamber. The heat-restoring chamber is preferably
formed at the bottom with a perforated arch, and below such arch with a
chamber having an opening closed by a tight-fitting lid or door.
The escape
opening at the top of chamber is provided with a sliding damper, which may
be partially closed for holding the products under pressure within the welding
furnace and heat-restoring chamber.
The welding furnace is provided in its ends with working doors on a level with
the earth, for inserting and withdrawing the pipes. The fuel gas, composed
preferably of water gas, or a mixture of water gas and producer gas, is supplied
to the burners under pressure by a blower or holder, and the two fluids, gas and air,
are supplied to the burners at substantially the same pressure, and are intimately
mixed in such burner, before escaping and being ignited at the nozzles or at
the ports.
The operation of this furnace is very simple and effective for heating the rolled
metal to a welding temperature, & also for heating the skelp by means of waste
products from the welding furnace to the proper temperature for forming into pipe.
The jets of mixed gas and air are ignited at the burners; the flames pass through
the furnace first near the crown thereof, and then are deflected by the arched crown
and side wall directly over and in contact with the pipes, which are arranged upon
the hearth. The outgoing or return currents of the flame pass through the furnace
chamber between the pipe and the live inflowing flames issuing from the burner
nozzles, so that such inflowing flame is not chilled by the comparatively cool pipes
which are constantly being inserted at the left hand side thereof, resulting in
better combustion and greater economy in the use of heat.
In this construction, by the inwardly projecting and overhanging bridge or arch
between the burner ports and the escaping flues, the cold pipes, which are inserted
at the left hand side of the furnace near the escaping flues, will not chill or
interfere with the free burning of the jets of gas and air from the burner nozzles.
The inwardly projecting bridge or arch protects the entering flames from the cold
pipes, but confines and deflects the outgoing flame and products from the newly
inserted pipes, thereby utilizing, to the best advantage, all the heat in the welding
furnace. Notwithstanding this construction and operation, by which the heat is
utilized to the best advantage in the welding furnace, the products escape therefrom
through flues at a high temperature, and in passing through the reverberatory heating
chamber, serve to heat the skelp to the proper temperature for forming into pipe,
after which the skelp is withdrawn from the chamber, and rolled into pipe form
it is then inserted into the welding furnace at the left hand side thereof, near the
escape flues, and these rolled up pipes are successively moved to the right, until
heated to the welding temperature, when they are withdrawn, and welded in the
usual manner. The heat is thus effectively utilized for heating the skelp and for
welding the pipes, making a continuous operation, and without unnecessary handling.
The cold strips of metal are also preferably entered at one side of the heating
furnace, and taken out the other side, and passed thence to the bending rolls. The
air blast is heated by the waste products, which finally escape through the chimney
at a low temperature.
;
Great economy in the use of gaseous fuel is secured by this furnace, and
improved results in heating and welding the metal are secured."
Dated this 10th day of December 1891.
NEWTON & SON,
Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in Gas Furnaces.
I, HENRY EDWARD NEWTON, of the Office for Patents, 6 Bream's Buildings,
Chancery Lane, in the County of London, Patent Agent, 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 a furnace adapted for heating pipes for welding the
longitudinal seam, by the combustion of gas and air introduced and burned under
pressure in such manner that the flame shall pass twice or in a double sheet, through
the furnace, and over the pipe, whereby greater efficiency and economy of the
gaseous fuel is secured. It is also adapted to heating iron or steel in bars or
blooms for forging or welding, and also adapted for heating the skelp from which
the pipes are rolled, by waste heat from the welding furnace, and also utilising the
waste products for heating the air which is forced to the burners.
The object of the invention is to provide for more uniformly heating the pipe or
material which is to be welded by the combustion of fuel gas and air under
controlled pressure.
In carrying out this invention, the furnace is constructed with an inwardly pro-
jecting and overhanging ledge or bridge containing the burner ports and burners,
and also a reverberatory or arched crown is provided, by means of which the flame
is deflected and made to fold upon itself, as it passes out over the rolled-up tubes,
and thus heat a number of tubes throughout their entire length, as it passes out
through the escape flues or ports arranged under the projecting bridge. The
rolled-up skelps ready for welding, are introduced first below the overhanging
bridge or arch, below which passes the return current of flame and hot products,
and are advanced successively to the hottest part of the furnace at the rear side
thereof, until ready to be drawn out and rolled in the well-known manner.
In the accompanying drawings:-
Figure 1, represents a longitudinal vertical section through the welding furnace
and air heater on line y y, Figures 2 and 3.
Figure 2 represents a transverse section on the line, Figure 3.
Figure 3 represents a horizontal-section taken on two horizontal planes, as shewn
by the lines and x, in Figure 2.
Figure 4 represents a longitudinal section, on enlarged scale, of the welding
furnace.
Figure 5 represents a longitudinal vertical section of the welding furnace, a
connected heating furnace, and an air heater on the line uu, Figure 6.
Figure 6 represents a horizontal section thereof on the line tt, Figure 5.
The welding furnace A is constructed of the usual material used in constructing
furnace in which a high beat is employed, and is provided with an arched crown C,
extending from end to end thereof, and down to the hearth B, at the right hand or
working-out side of the furnace. The side wall is preferably curved, and drawn in
below the crown of the furnace, as shewn in the drawings, for better deflecting the
flame and causing it to return upon itself, as indicated by the arrows. The left
hand side of the furnace, or firing side, is constructed with an inwardly projecting
and overhanging bridge D, which may be formed by corbelling the brickwork, as
shewn in Figures 1 and 5, or by an arched construction, as shewn in Figure 4, and
in such inwardly projecting bridge are formed the row of burner ports, c, as shown
in Figures 1, 2, and 3, in which are inserted the burners a. The metallic burner
shells may have contracted nozzles, or the brickwork at the inner ends of the
burners may be formed with short contracted openings a', leading into the firing
ports c, as shewn in Figures 1 and 3, for properly shaping and directing the flames
in the furnace chamber near the top thereof. Below the arch or corbelled

page_text: bridge D, and back of the burner ports, are formed the outlet ports and flues b,
near the hearth B, as shewn in Figure 1.
The flues b, may connect directly with the base of a heat-restoring chamber E,
as shewn in Figure 1, or with a reverberatory heating chamber L, as shewn in
Figure 5, and such heating chamber is preferably used for the purpose of heating
the skelp by means of the waste products from the welding furnace A, preparatory
to rolling such skelp into tubes. In this construction, the ends of the flues bare
bent upward at 6', for directing the flame and products over the skelp or strips of
metal which are laid upon the hearth M. The flame is thus prevented from
impinging upon the skelp, and is directed by the curved roof of the chamber L,
across to the outlet flucs t, which, as shewn in Figures 5 and 6, are arranged in a
row across the furnace, and extend downward, and connect with the large flue K,
which connects with one end of the heat restoring chamber El, from the other
end of which there extends a stack flue, as indicated by the dotted lines at N.
The air-heating tubes may be composed of coils of pipe H, as shewn in
Figures 1 and 3, or of Ų shaped pipes suspended in the heating chamber E", as
shewn in Figure 5. The heat restoring chamber E, shown in Figure 1, is
preferably formed at the bottom with a perforated arch e, and below such arch
with a chamber E³, having an opening el closed by a tight-fitting lid or door.
The escape opening at the top of chamber E is provided with a sliding damper a,
which may be partially closed for holding the products under pressure within the
welding furnace and heat-restoring chamber.
The welding furnace is provided in its ends with the working doors.a", on a level
with the hearth B, for inserting and withdrawing the pipes. The burners a are
provided with gas supply pipes f, having valves f', and leading from the gas
main F, and are also provided with air supply pipes i, having valves i', and leading
from the main I, which, in practice, connects with the heating pipes H, in the heat
restoring chamber. The air is forced through the heaters and to the burners by a
suitable pump or blower under pressure. The fuel-gas, composed preferably of
water gas, or a mixture of water gas & producer gas, is also supplied to the
burners under pressure by a blower or holder, and the two fluids, gas and air, are
supplied to the burners at substantially the same pressure, and are intimately
mixed in such burner before escaping & being ignited at the nozzles, or at the
ports c.
The operation of this furnace is very simple and effective for heating the rolled
metal to a welding temperature, and also for heating the skelp by means of waste
products from the welding furnace to the proper temperature for forming into pipe.
The jets of mixed gas and air are ignited at the burners, and, as indicated by the
arrows, the flames pass through the furnace, first near the crown thereof, and then
are deflected by the arched crown and side wall directly over, and in contact with
the pipes, which are arranged upon the hearth B. As indicated by the drawings
in Figure 4, the out-going or return currents of the flame pass through the furnace
chamber between the pipe and the live inflowing flames issuing from the burner
nozzles, so that such inflowing flame is not chilled by the comparatively cool pipes,
which are constantly being inserted at the left hand side thereof, resulting in better
combustion and greater economy in the use of heat.
It will be seen, in this construction, that by the inwardly projecting and over-
hanging bridge or arch, D, between the burner ports c, and the escaping flues,
the cold pipes, which are inserted at the left hand side of the furnace near the
escaping flues b, will not chill or interfere with the free burning of the jets of gas
and air from the burner nozzles. The inwardly projecting bridge or arch protects
the entering flames from the cold pipes, but confines and deflects the outgoing flame
and products from the newly inserted pipes, thereby utilising to the best advantage
all the heat in the welding furnace. Notwithstanding this construction and
operation, by which the heat is utilised to the best advantage in the welding
furnace, the products escape therefrom through flues, b, at a high temperature, and
in passing through the reverberatory heating chamber L, serve to heat the skelp

page_text: to the proper temperature for forming into pipe, after which the skelp is withdrawn
from chamber L, and rolled into pipe form. It is then inserted in the welding
furnace A, at the left hand side thereof, near the escape flues, and these rolled-up.
pipes are successively moved to the right, until heated to the welding temperature,
when they are withdrawn and welded in the usual manner. The heat is thus.
effectively utilised for heating the skelp and for welding the pipes, making a
continuous operation, and without unnecessary handling. The cold strips of metal
are also preferably entered at one side of the heating furnace and taken out the:
other side, and passed thence to the bending rolls. The air blast is heated by the
waste products, which finally escape through the chimney at a low temperature.
Great economy in the use of gaseous fuel is secured by this furnace, and improved.
results in heating and welding the metal are secured.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, as communicated to me
from abroad, I declare that what I claim is :-
1. A heating and welding furnace constructed on one side with an inwardly
projecting bridge or arch containing burners or ports opening at its inner face, and
also having escape flues in the side wall, at back of, and below such bridge and
arch, near the hearth of the furnace, substantially as described.
2. A heating and welding furnace having an arched crown and a line of escape
flues on one side near the hearth, and also provided with a line of burner ports.
containing burners, and opening near the crown of the furnace, in advance of, and
above the escape flues, and connections for supplying gas, and air to the burners,.
substantially as described.
3. In combination with a heating and welding furnace having escape flues on
one side, near the hearth, and burner ports above and in advance of the escape
flues, as described, a heating furnace connecting with said welding furnace by its.
escape flues, and having suitable escape flues for the purpose of utilising waste
products from the welding furnace, to heat skelp, preparatory to rolling,.
substantially as described.
4. The combination of the heating and welding furnace having escape flues on
one side thereof, near the hearth, the burner ports on the same side and above the
escape flues, a heating furnace with which said escape flues connect, a heat restoring
chamber containing air pipes and flues connecting the heating furnace with the
heat restorer, substantially as described.
Dated this 10th dox of September 1899
NEWTON & SON,
Agents for the Applicant..