IMPROVED ECONOMIZERS FOR HEATING THE. FEED WATER OF STEAM BOILERS
Year: 1874

page_text: LETTERS PATENT to John Prestwich, of Farnworth, in the County of
Lancaster, and Joseph Pimbley, of the same Place, for the In-
vention of "IMPROVED ECONOMIZERS FOR HEATING THE. FEED WATER OF
STEAM BOILERS."
Sealed the 8th June 1875, and dated the 9th December 1874.
PROVISIONAL SPECIFICATION left by the said John Prestwich and
Joseph Pimbley at the Office of the Commissioners of Patents,
with their Petition, on the 9th December 1874.
We, JOHN PRESTWICH, of Farnworth, in the County of Lancaster, and
JOSEPH PIMBLEY, of the same Place, do hereby declare the nature of
the said Invention for "IMPROVED ECONOMIZERS FOR HEATING THE FEED WATER
OF STEAM BOILERS," to be as follows:-
This Invention relates to apparatus commonly called "fuel econo-
mizers," used for heating the feed water of steam boilers, and consists
in improved arrangements and forms of piping for obtaining an increased
heating surface with a diminished volume of water.

page_text: In all economizers at present in use the water to be heated passes
through ordinary round pipes, the outer surfaces of which form the
heating surface, and the internal surface the area or capacity of the
water.
In our Invention instead of employing entirely round pipes we use
for each round pipe two pipes or passages cast at the bottom to a
circulating chamber and having between them a space for enabling a
scraper to be used; and all the pipes of the series are connected by
bolts and nuts to circulating chambers or boxes at the top, there being
in the lower chambers spaces having covers for enabling scales and
sediment to be removed. These two pipes may be circular at their outer
and inner surfaces, and angular at their ends, in which case they have
a considerably greater extent of surface than one ordinary round pipe
occupying an equal space, and at the same time the volume of water is
diminished to a great extent; and in consequence of this increased
heating surface acting on a less body or volume of water as it passes
through the range of pipes or passages the fuel is economized to a very
great extent.
We do not confine ourselves to the shapes of these two pipes, for they
may be hexagonal, octagonal, corrugated, or of any other shape which
gives a greater heating surface and a less volume of water than the
ordinary round pipe, which occupies a space equal to that of the two
pipes.
.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said John Prestwich and Joseph Pimbley in the Great 25
Seal Patent Office on the 9th June 1875.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, JOHN
PRESTWICH, of Farnworth, in the County of Lancaster, and JOSEPH
PIMBLEY, of the same Place, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters 30
Patent, bearing date the Ninth day of December, in the year of our
Lord One thousand eight hundred and seventy-four, in the thirty-eighth
year of Her reign, did for Herself, Her heirs and successors, give and

page_text: grant unto us, the said John Prestwich and Joseph Pimbley, Her special
license that we, the said John Prestwich and Joseph Pimbley, our
executors, administrators, and assigns, or such others as we, the said
John Prestwich and Joseph Pimbley, our executors, administrators, and
assigns, should at any time agree with, and no others, from time to time
and at all times thereafter during the term therein expressed, should
and lawfully might make, use, exercise, and vend, within the United
Kingdom of Great Britain and Ireland, the Channel Islands, and Isle
of Man, an Invention for "IMPROVED ECONOMIZERS FOR HEATING THE FEED
WATER OF STEAM BOILERS," upon the condition (amongst others, that we,
the said John Prestwich and Joseph Pimbley, our executors or admi-
nistrators, by an instrument in writing under our or their, or one of our
or their hands and seals, should particularly describe and ascertain the
nature of the said Invention, and in what manner the same was to be
performed, and cause the same to be filed in the Great Seal Patent Office
within six calendar months next and immediately after the date of the
said Letters Patent.
NOW KNOW YE, that we, the said John Prestwich and Joseph Pimbley,
do hereby declare the nature of our said Invention, and in what manner
the same is to be performed, to be particularly described and ascertained
in and by the following statement (that is to say) :-
This Invention relates to apparatus commonly called "fuel econo-
mizers," used for heating the feed water of steam boilers, and consists
in improved arrangements and forms of piping for obtaining an increased
heating surface with a diminished volume of water.
In all economizers at present in use the water to be heated passes
through ordinary round pipes, the outer surfaces of which form the
heating surface, and the internal surfaces the area or capacity of the
water.
In our Invention instead of employing entirely round pipes we use
for each round pipe two pipes or passages cast at the bottom to a
circular chamber and having between them a space for enabling a
scraper to be used, and all the pipes of the series are connected by bolts
and nuts to circulating chambers or boxes at the top, there being in the
lower chambers spaces having covers for enabling scales and sediment
to be removed. These two pipes may be circular at their outer and

page_text: inner surfaces and angular at their ends, in which case they have a
considerably greater extent of surface than one ordinary round pipe
occupying an equal space, and at the same time the volume of water is
diminished to a great extent; and in consequence of this increased
heating surface acting on a less body or volume of water as it passes
through the range of pipes or passages the fuel is economized to a very
great extent.
On the accompanying two Sheets of Drawings Fig. 1, Sheet 1, is a
side elevation; Fig. 2, a plan, partly in section; Fig. 3, Sheet 2, an end
elevation of an economizer having one arrangement of our improved
pipes or passages; and Fig. 4 is a cross section enlarged of one pair of
pipes and scrapers. In this arrangement a represents the ordinary soot
chamber; b, the top of the flue; and c the brickwork; and instead of
the round pipes hitherto used we employ two pipes d having passages e,
and these pipes are circular at their outer and inner surfaces and angular
at their ends, as seen in Figs. 2 and 4; and these two pipes have
about double the heating surface of an ordinary economizer round pipo
occupying the same area. The two pipes & are cast at the bottom to
circular chambers ƒ for allowing the water to circulate through the
pipes, and at the top the pipes are connected by flanges g to the water
circulating boxes h and pipes i, and at the bottom of the circular
chambers there are covers k for enabling scales and sediment to be
removed.
In Figs. 1, 3, and 4, 7 represents the scrapers, which are formed of
the same shape as the pipes, and are connected by chains m to the
pulleys n, which are caused to revolve by any well known means in
order to move the scrapers to and fro.
We do not confine ourselves to the shapes of these two pipes, for they
may be hexagonal, octagonal, corrugated, or of any other shape which
gives a greater heating surface and a less volume of water than the
ordinary round pipe, which occupies a space equal to that of the two
pipes.
Having now described the nature and particulars of our said Invention
we desire it to be understood that in fuel economizers for heating the
feed water of steam boilers we claim the use of pipes shaped otherwise
than round, such as those shewn in the Drawings, or of an octagonal,

page_text: hexagonal, or any other shape which gives a greater heating surface
acting on a less volume of water than the ordinary round pipes.
In witness whereof, I, the said Joseph Pimbley, for and on behalf
of myself and the said John Prestwich, have hereunto set my
hand and seal, this Seventh day of June, in the year of our Lord
One thousand eight hundred and seventy-five.
JOSEPH PIMBLEY. (L.S.)