Improvement in Tubular Steam Generators or Water Tube Boilers.
Year: 1893

page_text: Date of Application, 1st Aug., 1893
Complete Specification Left, 9th Apr., 1894-Accepted, 19th May, 1894
PROVISIONAL SPECIFICATION.
Improvement in Tubular Steam Generators or Water Tube Boilers.
I, GUSTAV DURR, Engineer, of Ratingen, near Düsseldorf, Germany, do
hereby declare the nature of this invention to be as follows:-
This invention relates to the means for connecting inclined water tubes with
vertical tube plates and water chambers.
In order to obtain a perfectly tight joint, 1 use a conical ferrule or a conical
ring welded on to the end of the tube, but not coaxial with the same. The axis of
the cone is perpendicular to the tube plate and therefore forms an acute angle with
the axis of the tube.
In the accompanying drawing:
Fig. 1 is a partial section of a water tube boiler embodying my invention.
Fig. 2 shows on a larger scale the connection of a tube with the tube plate.
Fig. 3 is an end view of the tube shown in Fig. 2.
s, s, are the water tubes inclined at an angle a (alpha).
m-n is the axis of the tube in Fig. 2
ay is the axis of the truncated cone formed by the sides A-C and B—D of
the ferrule.
Dated this 1st day of August 1893.
FAIRFAX & WETTER,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvement.in Tubular Steam Generators or Water Tube Boilers,
I, GUSTAV DURR, Engineer, of Ratingen, near Düsseldorf, Germany, 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 :-
In many cases, for instance on ships, it is necessary or desirable, to place the
waterchamber of water tube boilers in a vertical position, while the tubes are
inclined, so that the latter are no longer perpendicular to the tube plate, but form
an acute angle with the same.
Now, for producing a tight joint by means of conical ferrules or outside flanges
welded on to the tube, the conical hole bored into the tube plate for this purpose
should be perpendicular to the latter. It follows, that the axis of the truncated
cone formed by the sides of the ferrule or flange will not coincide with the axis of
the tube, but form an acute angle with the same. This construction of the joint is
the subject of my present invention.
In the drawing filed with the Provisional Specification
Fig. 1 is a partial section of a water tube boiler embodying my invention ;
Fig. 2 shows on a larger scale the connection of a tube with the tube plate;
Fig. 3 is an end view of the tube shown in Fig. 2.
3, 3, are the water tubes inclined at an angle a (alpha).
m-n is the axis of the tube in Fig. 2.
xy is the axis of the truncated cone formed by the sides A-C and B-D of

page_text: The ferrule should be turned on the lathe to correspond exactly with the
conically bored hole in the tube plate.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is ;-
In boilers or steam generators having water tubes placed at an acute angle to
the tube plates or water chambers, the combination of a tube plate with a water
tube having a conical ferrule or flange the axis of which is perpendicular to the
tube plate, and which forms a joint between the tube and the plate, substantially as
.described.
Dated this 5th day of Anril 1894
FAIRFAX & WETTER,
433, Strand, London, Agents.