Improvements in and in the Manufacture of Steam Generator Flues.
Year: 1887

page_text: Date of Application, 16th Mar., 1887
Complete Left, 12th Dec., 1887
Complete Accepted, 13th Jan., 1888
PROVISIONAL SPECIFICATION.
Improvements in and in the Manufacture of Steam Generator
Flues.
I THOMAS OLDHAM of the Wollington Boiler Works, Stockport in the County of
Lancaster, Boiler Maker, do hereby declare the nature of this invention to be as
follows:-
-
My Invention relates more particularly to the internal flues and to the furnace
flues of steam generators and has for its principal objects to increase their strength
and to make provision for the expansion and contraction to which they are subjected
as is well understood. Previously to my invention such flues have been made of rings
which have been flanged at their ends and connected together by means of rivets
which bavo passed through the flanges and in some cases the ends of the rings have
been opened out to a larger diameter and riveted together. In carrying into effect
my invention 1 form the plates into cylindrical rings by. ordinary or suitable meaus
and 1 enlarge each end of each ring or i form each ring with an enlargement of
diameter at each end and I connect together each two contiguous rings by welding
their edges together. Each ring for convenience of welding would be made a little
larger in diameter at one end than the other so that the enlarged end of one ring
would enter a suitable distance into another ring. I heat the overlapping and
underlaying ends of two contiguous rings by means of a gas flame or of a furnace
or by suitable means and weld the two rings together. I then adopt the same
means for connecting a third ring and proceed in this manner until I obtain a
flue of the required length. Such a flue will be free from joints and will be
well calculated to resist the strains which tend to cause collapse and the strains arising
from expansion and contraction.
DUTTON & FULTON,
1, St. James Square, Manchester,
Agents.

page_text: COMPLETE SPECIFICATION.
Improvements in and in the Manufacture of Steam Generator
Flues.
I THOMAS OLDHAM of the Wellington Boiler Works Stockport in the County of
Lancaster Boiler Maker 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 and accompanying drawings:-
My Invention relates more particularly to the internal flues and to the furnace flues
of steam generators and has for its principal objects to increase their strength and to
make provision for the expansion and contraction to which they are subjected as is
well understood. Previously to my invention such flues have been made of rings
which have been flanged at their ends and connected together by means of rivets
which have passed through the flanges and in some cases the ends of the rings have
been opened out to à larger diameter and riveted together, or the different lengths of
the flue have been connected by narrow rings or hoops of various sections the con-
nections being effected by means of rivets. In carrying into effect my invention I
form cylindrical rings by ordinary or suitable means and I enlarge each end of each
ring or I form each ring with an enlargement of diameter at each end and I connect
together each two contiguous rings by welding their edges together.
In order that my invention may be clearly understood I will describe the same with
reference to the attached drawings.
In the said drawings Fig. 1 represents a complete furnace or internal flue produced
in accordance with my invention and suitable for use in the construction of a steam
generator of the Lancashire type.
Fig. 2 illustrates the formation of the joint between two contiguous rings drawn
to an enlarged scale and Fig. 3 illustrates one of the modifications which may be
made in the form of the said joint.
In Fig. 1 the flue is represented as consisting of four rings a a¹ but it will be
understood that there may be less or more than four rings in a single flue according
to the length of the same or to the individual length of the rings. Each ring is made
by bending a plate into a cylindrical form and welding the edges together so as to
form a complete hollow cylinder or the rings or hollow cylinders are otherwise suitably
produced. The ends of two rings which are to be united together are flanged out and
enlarged in diameter as indicated at bb in Fig. 1 and in Fig. 2 which represents a
section of one of the joints at b. It will be seen that in Fig. 2 the mecting ends of
the two rings are represented as being coned or tapered so that the end of one ring a
enters a short distance into the end of the other ring a. In practice I turn the
meeting edges of the two rings by means of a lathe or suitable tool so as to produce a
better and more truly fitting joint between
together I heat the joint by means of a gas
joint so as to unite the two rings together.
the two rings. To unite the two rings
flame or by suitable means and weld the
When two rings are thus united a third

page_text: and a fourth ring are added in succession and welded to the others so as to form a
complote flue as represented, or the rings may be welded together in pairs and the
longer rings thus produced be welded together to form a complete fluc. In the
example the outer rings a a' are flanged in the usual manner for connection with the
end plates of the boiler. A flue so produced is free from joints and if the welding
operations have been efficiently performed the flue will be perfectly water tight from
end to end. It will also be well understood that such a flue will be well calculated to
resist the strains which tend to cause collapse and also the strains arising from
expansion and contraction. If it be considered to be advisable, the comparativo
length of each ring may be made proportionately less than the indication in Fig. 1
so as to increase the number of rings in a flue of a given length and thereby to
increase the number of the stiffening projecting rings or collars b. b. Although in the
example the main body of each ring extending between the parts of larger diameter
are shown as being simply cylindrical I do not confine myself to this formation as for
example the rings might be corrugated. I do not confine myself to the conical joint
shown in Fig. 2 so long as the enlarged ends of the seamless rings are welded
together.
In Fig. 3 another formation of welded joint is indicated.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed 1 declare that what
I claim is
(1.) The steam generator flue formed and produced in the manner and by the means
substantially as set forth and indicated.
(2.) A steam generator flue composed of cylindrical seamless rings flanged out or
enlarged in diameter at their meeting ends and having their meeting edges welded
together.
(3.) A seamless steam generator flue produced by welding together the meeting
edges of rings which have been flanged out or enlarged in diameter substantially as
set forth and indicated.
1011
en
1007
DUTTON & FULTON,
1, St. James Square, Manchester,
Agents.