Improvements in Steam Boilers.
Year: 1889

page_text: Date of Application, 16th Apr., 1889
Complete Specification Left, 16th Jan., 1890-Accepted, 22nd Feb., 1890
PROVISIONAL SPECIFICATION.
Improvements in Steam Boilers.
I, WILLIAM JOHN JOBLING, of Queen Street, in the City and County of New-
castle-upon-Tyne, Steamship Manager and Engineer, do hereby declare the nature of
my said invention to be as follows
-
My invention relates to certain improvements in the form and construction of steam
boilers to adapt them to the high pressures now generally carried-having special
reference to steamships' boilers-and to obviate the use of shell plates of exceptional
thickness involving difficult handling and rivetting, also to avoid the frequent failures
and trouble with the furnaces.
According to my invention I form the hoiler of a number of cylindrical vessels,
each of which forms one, of a series of shells, disposed horizontally and connected
together by water tubes. As five of these shells is a convenient arrangement on
board steam ships I will describe a boiler which may be so constructed.
"
"
The three lower shells will be disposed side by side with spaces between them
floors
which form the furnaces the shells resting in cradles built on the ships'
and the furnace bottoms being carried over the "floors." The two upper shells will
be placed over the other three and joined to them by the water tubes and these shells
may contain either flues or tubes and, if necessary, additional steam space may be
provided in a receiver on top. The three lower shells will each of them have one or
more flues through which the flame and gases, after dividing in a combustion
chamber at the back end, will return to the front where the flues will enter another
chamber which will lead the flame and gases upward to pass through the flues or
tubes in the upper shells and so to the chimney.
In boilers fired from both ends the shells will extend the entire length and the
furnaces inay open into a combustion chamber common to both or divided, the flame
and gases will enter the flues in the three lower shells through branch flues and after
making their circuit and arriving at the end of the flues or tubes in the upper shells
will enter a smoke box dividing them to which the chimney may be attached.
Dated this 16th dow of April 1889
T. J. DANSON.
Per L. W.
COMPLETE SPECIFICATION.
Improvements in Steam Boilers
I, WILLIAM JOHN JOBLING of Queen Street in the City and County of New-
castle upon Tyne, Steamship Manager and Engineer do hereby declare the nature of
my said invention and in what manner the same is to be performed to be particularly
described and ascertained in and by the following statement :-
My invention relates to certain improvements in the fort and construction of
steam boilers to adapt them to the high pressures now generally carried-having
special reference to steam ships boilers-and to obviate the use of shell plates of
exceptional thickness involving difficult handling and rivetting, also to avoid the
frequent failures and trouble with the furnaces.
According to my invention I form the boiler of a number of cylindrical vessels,
each of which forms one, of a series of shells, disposed horizontally and connected
together by water tubes. As five of these shells is a convenient arrangement on
board steam ships I will describe a boiler which may be so constructed..
The three lower shells will be disposed side by side with spaces between them which

page_text: form the furnaces the shells resting in cradles built on the ships "floors" and the
furnace bottoms being carried over the "floors."
The two upper shells will be placed over the other three and joined to them by
water tubes and these shells may contain either flues or tubes and, if necessary,
additional steam space may be provided in a receiver on top. The three lower shells
will each of them have one or more flues through which the flame and gases, after
dividing in a combustion chamber at the back end, will return to the front where the
flues will enter another chamber which will lead the flame and gases upward to pass
through the flues or tubes in the upper shells and so to the chimney.
In boilers fired from both ends the shells will extend the entire length and the
furnaces may open into a combustion chamber, common to both or divided, the flame
and gases will enter the flues in the three lower shells through branch flues and after
making their circuit and arriving at the end of the flues or tubes in the upper shells
will enter a smoke box dividing them to which the chimney may be attached.
On the accompanying 4 sheets of Drawings I illustrate a single ended boiler
constructed according to my invention and also the disposition of a pair of such
Boilers in a steam-ship.
Sheet 1 shows an end elevation one half in section, marked Fig. 1.
Sheet 2 shews a longitudinal elevation in section through the line X-X-X-X
of Fig. 1 (Sheet 1) marked Fig. 2.
Sheet 3 shews a "6
Fig. 3.
thwart-ship" section of a steam ship with 2 boilers and marked
Sheet 4 shews a fore and aft view of the machinery space the 2 Boilers being
disposed with their backs to the engines. The 3 lower shells A A A are connected to
the 2 upper shells B B by water tubes CC and the steam shell or receiver D is
supported from the 2 upper shells by the steam tubes E E.
The lower shells rest and are secured in cradles F F constructed upon the "floors."
The spaces between the shells form the furnaces G G the bottoms or ash pits of which
are on top of the "floors" and the bars are carried by "dead-plates" and "bridges."
Each of the shells A A A has a fire flue H traversing it from end to end communi-
cating with a combustion chamber at back end of furnace by the branch fire flues KK
and opening into another fire chamber L at front end.
The 2 upper shells B B are traversed from end to end by a number of fire
tubes M M up to within a proper distance from the water level and these tubes open
at the front end into the fire chamber L and at the back end into the flame
chamber N whence the flame, gases and smoke return to the front end by a flue O,
formed in the space between the shells, and so pass into the chimney P. The
course of the flame, gases and smoke is indicated by the arrows. The exposed surfaces
of the fire chambers will be protected from radiation of heat by fire brick or other
non-conducting linings and provided with doors for access to the tubes and flues for
repairs or cleaning and manholes will be provided in the shells where necessary for
access to the interiors.
It will be seen that the only parts of the Boiler which require stays are the flat
ends of the shells A A A and B B (unless made with rounded ends) and that the
flat ends of the latter when tubes are fitted may be stayed by stay tubes. The steam
receiver D may have rounded ends requiring no staying.
In double ended Boilers the 3 lower shells A A Å and the two upper shells BB
may extend the entire length of the Boiler as also may the fire tubes J J J the
furnaces H H opening into a combustion chamber common to both ends or divided
and from which the flame and gases enter the fire flues through branch flues then
travel toward each end into the chambers L through the tubes in upper shells B B to
a chamber, formed in the middle of the length of the shells by the back tube plates,
and thence passing to the chimney. Q is a tube through which air may be admitted
in regulated quantity into the fire flues H H to promote combustion.

page_text: Having now particularly described and ascertained the nature of said inven-
tion, and in what manner the same is to be performed, I declare that what
I claim is:-
The construction of Steam Boilers comprising a series of cylindrical shells, of com-
paratively small diameter, traversed longitudinally by fire flues or tubes, or by a
combination of flues and tubes, said shells being so disposed that furnaces combustion
chambers and flues, or any of them, may be constructed externally to them with the
objects of securing strength to contain very high pressures, facilitating construction
and obtaining evaporative efficiency substanially as described and illustrated.
Dated thin 16th day of Jan1900
T. J. DANSON, F.I.P.A.,
Agent for Applicant.