Improvements in the Construction of Water Tube Boilers.
Year: 1890

page_text: Date of Application, 25th Nov., 1890-Accepted, 14th Mar., 1891
COMPLETE SPECIFICATION.
Improvements in the Construction of Water Tube Boilers.
1, GUSTAV DÜRR, Manufacturer, of Ratingen, near Düsseldorf, in the Kingdom
of Prussia, and German Empire, 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 the construction of water tube boilers and it has for its
object to provide as great a heating surface in a boiler as possible the arrangement
comprising two separate water tube boilers having separate fire places with which
are combined ordinary boilers these being placed above.
The invention is illustrated on the three appended sheets of drawings the modifica-
tion shewn in longitudinal section at Figure 1 and in horizontal section at Figure 2 and
the modification shewn in longitudinal section in horizontal section and in transverse
section respectively by Figures 3, 4, and 5 consisting of two sets of inclined water
tubes a a¹ each set of tubes being connected to a water chamber and the whole
of them operating in common with an arrangement of upper boilers A A' B B and
steam domes or tubes C C', the simple letters referring to Figures 1 and 2 and those
with the index 1 referring to Figures 3, 4, and 5. The water chambers bare
each divided internally into two compartments with one of which ends of the
tubes a a' communicate, the other ends of said tubes being closed. Within each of
In
the tubes aa is contained a tube of smaller diameter one end of which opens into
the external tube a short distance from its closed end, whilst the other end passes
through the compartment of the water chamber into which the external tube
opens and communicates with the second compartment of said water chamber.
the arrangement Figures 1 and 2 the two water chambers are placed at the ends
of the upper boilers A. B whilst in the modification Figures 3, 4, and 5 the water
chambers & are at the inner ends of the furnaces. The circulation of the water and
steam takes place in the following manner.
The water tube boiler shewn on the left of Figure 1 communicates with the upper
boilers A B through the water chamber & one compartment of which is connected to
the boiler A. through the tubular stay e the other compartment being connected to the
boiler B through the stay h. The water tube boiler shewn on the right of Figure 1
communicates in a similar manner with the boiler B through the stay d and with the
boiler A. through the stay 9.
From the boilers A and B the steam generated passes through the tubes ef into
the steam dome C which also acts as a superheater and from whence the steam is
served through the connection K. The feed water enters the boilers A B at i and
passes through the hollow stays or tubes gh into one compartment of the chambers b
thence down the internal and up the external tubes a into the other compartment of
the chambers and thence through the stays dc into the boilers BA.
In the arrangement shewn in Figures 3 and 4 the circulation is the same
similar parts being designated by like letters with the addition of the index 1.
Under the modification illustrated in longitudinal vertical section by Figure 6,
Sheet 3 in horizontal section by Figure 7 and in transverse section respectively on
the lines and z by Figures 8 and 9 cach series of tubes a is connected to both the
upper boilers A. B the series to the right of Figure 6 being connected to the
boiler B by the tubular stay d and to the boiler A by the tubular stay g while
the series of tubes on the left side of the said figure is connected to the boiler A by
the tubular stay c and to the boiler B by the tubular stay h the tubes a in this case
opening into a single water chamber at each end and the internal tubes being
disnensed with.

page_text: With this arrangement of tubular stays it follows that the water fed at i into
the upper boiler B together with that which has not been altogether converted
into steam passes through the stay h, and into the series of tubes arranged on the
left hand side and is discharged into the upper boiler A. through the stay c whence
it passes through the stay 9 into the series of tubes arranged on the right side and
thence through the stay into the boiler B and similarly with the water
fed into the boiler A. the steam generated in both being conveyed to the steam
dome or drum C through the pipes e f
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 :-
1. The combination of two water tube boilers with two communicating upper
boilers and with a steam dome or drum substantially as described and shewn on
Sheets 1 and 2 of the accompanying drawings.
2. The combination of two water tube boilers each with two upper boilers and
a steam dome or drum substantially as described with reference to Sheet 3 of the
appended drawings.
Dated this Twenty fourth day of Novensko.
1000
CRUIKSHANK & FAIRWEATHER,
62, St. Vincent Street, Glasgow, Agents.