IMPROVEMENTS IN STEAM BOILERS
Year: 1885

page_text: JONATHAN COOK JOPLING Boiler Manufacturer. of. Pallion, Sunderland in
the County of Durham do hereby declare the nature of my said invention for
IMPROVEMENTS IN STEAM BOILERS to be as follows:-
The improvements herein referred to are applicable to Horizontal Boilers, usually
called Cornish or Lancashire boilers. The object of the invention. being to auginent
the area of heating surface, facilitate cleaning & repairs, with increased facilities
for the free circulation of the water & the expansion of the flue.
The accompanying drawings aided by the following description will fully explain
the method adopted for effecting the object of the invention.
Fig. 1 is a longitudinal section of a boiler embodying my improvements.
Fig. 2 being a section thro the line A B of fig. 1.
The same letters of reference indicate like parts in the respective figures.
The shell of the boiler C is of the ordinary construction.
The fire is enclosed in the circular flue D¹; the flame & gasses pass from thence
through the small flue D" and the small fire tubes E into the flue D which is of
the same diameter as the part of flue D'; the small flue D¹ is of a diameter to
allow a man to get through it (say 15 or 18 inches in diar).
The small fire tubes E are inserted in tube plates G & G.
The water surrounds the flue D¹, D¹ D¹¹¹ and also fire tubes E.
The boiler may be fixed as is usual with Cornish or Lancashire boilers.
;
The advantages of this principle of construction are-the largely increased
heating surface gained by the insertion of small fire tubes & flue in the manner
shewn; the greater freedom for expansion of flue & the better circulation of the
water.
Having now described the nature of my invention & in what manner the same
is to be performed, I declare that what I claim is-the addition of small horizontal
fire tubes E & small flue Du with tube plates G & G' to horizontal Boilers, in the
manner described.
In large boilers this arrangement may be repeated two or three times in the
Blue.

page_text: I, JONATHAN COOK JOPLING of Pallion, Sunderland, in the County of Durham,
Boiler Manufacturer, 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:-
My invention for improvements in steam boilers relates to that class of horizontal
boiler, usually called "Cornish" or "Lancashire" boilers, in which a flue or flues
passes or pass internally from end to end of the boiler and is or are provided with
'an internal firebox or fireboxes; and has for its objects to increase the area of the
heating surface of the flue or flues, to facilitate cleaning or repairs, to increase
the circulation of the water in the boiler and to allow for the free expansion of the
flue or flues.
In a steam boiler constructed according to my invention, the outer shell is of
the ordinary construction with the flue or flues passing internally from end to end
of the shell and containing the internal firebox or fireboxes at the front end or ends.
Each flue is constructed in two or more lengths of tube having their adjacent ends
between the different lengths closed by tube plates and connected at the lower part
by a small flue having a sufficient diameter to allow of the passage of a man,
say 15 inches or 18 inches in diameter, and at the upper part by a number of
small fire tubes; the small flue and the fire tubes being surrounded by the water
in the boiler, as is also the main flue.
In the accompanying sheet of drawings Fig. 1 is a longitudinal section of a single
flued boiler constructed according to this invention; and
Fig. 2 is a cross section of the same through a b.
The shell C of the boiler is of the ordinary construction and the internal flue is
constructed in two lengths D¹ D1 having their adjacent ends closed by tube
plates G G¹ respectively. The two lengths D¹ Du are connected by the small
flue D and the small fire tubes E secured in the plates G G¹. The heated gases
from the fuel in the firebox in the length D' of the flue pass from the length D',
through the small flue D1 and, fire, tubes E to the length of the flue.
In fig. 3 which shows in a similar view to Fig. 1 a modified construction suitable
for boilers of larger size, a space is left between the end of the length D and the
back end of the shell C. The said end is closed by a tube plate G₁. A small
flue D, similar to the flue D" and a number of small firetubes E, similar to the
tubes E admit of the passage of the gases of combustion from the length D to
the exterior of the boiler.
It is evident that the construction of boiler shown in the drawings may be
modified without departing from the nature of my said invention.
Having now particularly described and ascertained the nature of my said
Invention, and, in what manner, the same is to be performed, I declare that what
I claim is
1
1. The construction of a horizontal boiler having a portion of an internal flue
replaced by a smaller flue and a number of small fire tubes substantially as
described.

page_text: 2. The construction of a horizontal boiler having an internal flue consisting of
two or more lengths of main tube connected by a smaller tube or tubes and a
number of small fire tubes inserted in tube plates in the adjacent ends of the main
tube substantially as described with reference to figs. 1 & 2.
3. The construction of a horizontal boiler having a portion of the back end of
its internal flue replaced by a smaller flue and a number of small fire tubes
inserted between a tube plate on the back end of the internal flue and the back end
of the shell of the boiler substantially as described with reference to fig. 3.
4. The construction of internally flued horizontal. boilers substantially as
described with reference to the drawings.