IMPROVEMENTS IN STEAM BOILERS
Year: 1884

page_text: We JAMES LAYFIELD and Humphrey LAYFIELD, both of Burnley in the County
of Lancaster, Boiler Makers do hereby declare the nature of the said invention for
IMPROVEMENTS IN STEAM BOILERS to be as follows:-
This invention relates to improvements in three flued steam boilers, and it is
intended to make them more economical and more efficient as steam producers than
any of that type of boiler at present in use.
Our invention consists in a boiler with three internal flues, the third flue of
which instead of traversing the length of the boiler dips down and passes to the
outside beneath the boiler. This plan is susceptible of several modifications, but
after various experiments the mode of carrying out our invention to the best
advantage, is the following.
The bottom or third flue after passing inside the shell of the boiler in the usual
way for the distance of the fire box dips down and the flame and products of
combustion are thrown under the boiler bottom. The bottom flue in seating is
made of sufficient width to receive flame and products of combustion from bottom
iron flue only, the result is the side flues are thrown well under the boiler bottom.
The products of combustion from the three flues meet in a chamber at back end of
boiler and from thence pass along one side flue under the boiler bottom at front
end, down the other side flue, after which they escape up the chimney. Or the
bottom flue in seating is made of sufficient width so as to allow the construction of
three separate brick flues in the same. Then the flame and products of combustion
from the third iron flue pass along the centre of these flues under boiler bottom to
the back end. All three meet in a chamber at the back end of boiler and from
thence pass along two flues under the boiler bottom to the front end, back again
along two side flues, after which they escape up the chimney.. By this arrangement
of the flues of the boiler and especially by passing the main bottom flue under the
shell of the boiler, there is secured a displacement of the large body of water in the
boiler bottom and the same has full liberty of action by dispensing with two thirds
of bottom iron flue which is not the case in the usual construction of boilers. It
is estimated that the wear and tear will be less with an equivalent evaporative
power, and that greater facility for cleaning out and for access for repairs and
inspection is afforded.

page_text: •
We, JAMES LAYfield and HumpHREY LAYFIELD both of Burnley in the County
of Lancaster, Boiler Makers do hereby declare the nature of our said invention
for "IMPROVEMENTS IN STEAM BOILERS " 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 improvements in three flued steam boilers, and it is
intended to make them more economical, and more efficient as steam producers than
any of that type of boiler at present in use.
Our invention consists in a boiler with three internal flues, the third or bottom
flue of which instead of traversing the whole length of the boiler as in the ordinary
constructed three flued steam boiler, traverses the length of the fire grate only,
after which by a substantial arrangement the flue is bent downwards so as to
convey the products of combustion along the under side of shell bottom to the end
of boiler. This plan is susceptible of several modifications, but after various
experiments the mode of carrying out our invention to the best advantage is set
forth in the accompanying drawings in which: Figure 1 is a front view. Figure 2
transverse section. Figure 3 longitudinal section and Figure 4 plan of seating with
boiler removed.
In these A is the bottom or third flue which after passing inside the shell of the
boiler in the usual way for the distance of the fire-box dips down at B, and the
.flame and products of combustion are thrown under the boiler bottom. The
bottom flue C in the seating is made of sufficient width to receive the flame and
products of combustion from the bottom iron flue A only, the result is the side
flues D and I are got of great area without increasing the usual width from swell of
boiler, and the flame and products of combustion of the whole three iron flues are
thrown well under the boiler bottom. The products of combustion from the three
combustion flues A E F meet in a chamber G at back end of boiler and from
thence pass along the side flue D to the front end flue H, and from. thence along
the side flue I, after which they escape up the chimney through damper J.
Instead of this arrangement, we may make the bottom flue in seating C of
sufficient area to receive the flame and products of combustion from the three
combustion flues A E F. This bottom flue C is thus divided into three com-
partments, so that the flame and products of combustion from the combustion flue A
pass along the centre compartment and are delivered in the back flue or chamber G.
The flame and products of combustion from the two combustion flues E F are also
delivered in the back flue or chamber G. Then the whole three combined enter the
two outside compartments in bottom flue seating C, pass on to the front end flue H,
divide and pass up the two side flues D and I after which they escape up the
chimney through a damper at each side.
We prefer however the plan shown in the drawing.
By our improved arrangement there is secured a displacement of the large body
of water in the boiler bottom and the same has full liberty of action by dispensing
with two thirds of bottom iron flue, which is not the case in the usual construction
of boilers. It is estimated that the wear and tear will be less with an equivalent
evaporative power, and that greater facility for cleaning out, internally and
externally, and for access for repairs and inspection is afforded.

page_text: Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim is:-
The manufacture of steam boilers having two internal furnace flues above and
one below, the lower one traversing the boiler for only a short distance, and then
passing out through the shell of the boiler, leaving a vacant water space under the
upper flues for the remaining length of the boiler, substantially as described.
WP. THOMPSON & Co.,
Of 6, Lord Street, Liverpool,
and 323, High Holborn, London,
Patent Agents for the Applicants.
WP. THOMPSON & Co.,
Of 6, Lord Street, Liverpool,
and 323, High Holborn, London,
Patent Agents for the Applicants.