AN IMPROVED FEED WATER HEATER AND FURNACE COVERING FOR STEAM BOILERS, MORE PARTICULARLY ADAPTED FOR * MULTITUBULARS' USED ON 'COPPER Walls'
Year: 1874

page_text: PROVISIONAL SPECIFICATION left by William Thompson Mann at
the Office of the Commissioners of Patents, with his Petition, on
the 27th April 1874.-A communication from abroad by George
Walters Risien, of Demerara.
I, WILLIAM THOMPSON MANN, of the Firm of Fawcett, Preston, and
Company, of Liverpool, in the County of Lancaster, do hereby declare
the nature of the said Invention for "AN IMPROVED FEED WATER HEATER
AND FURNACE COVERING FOR STEAM BOILERS, MORE PARTICULARLY ADAPTED FOR
* MULTITUBULARS' USED ON 'COPPER Walls'," (à communication to me from
› abroad by George Walters Risien, of Demerara), to be as follows:-
--
Between the boiler and the last "copper" or pan of a "
copper wall"
used in sugar manufactories there is frequently fixed an independent
furnace. Heretofore it has been the custom to cover over the space
between the last "copper" and the boiler with a brick arch or cast-iron
girders so arranged as to allow of being filled up with fire-bricks.
The first plan is objectionable, as to enable the arch to be built
sufficiently strong it is almost compulsory to shut out certain tubes of
the boiler from the action of the fire in order to keep the crown of the

page_text: arch a proper distance above the tubes. The second plan lasts only a
short time, and should the independent furnace be frequently used its
decomposition is very rapid.
Now this Invention consists in covering the space between the last
"copper" and the boiler with a series of connected pipes filled in with
fire-brick through which the feed water for the boiler must pass. The
water will in its passage through the pipes not only be heated to a high
temperature, but will effectually preserve the pipes from being burnt,
and will thus form a substantial and durable covering for the space
between the last "copper." and the boiler. This system of pipes may
be carried on to the smoke box end of the boiler, and if desired, in the
case or ordinary Cornish or Galloway boilers, where it is desirable to
superheat, the steam may be prolongued over the entire top surface of
boiler, removing the necessity of brick arches, thus increasing the
heating surface and utilizing all the waste heat on its way to the
chimney.
The feed water may enter the pipes where circumstances may best
suit.
On the main feed pipe leading from the engine and as near to the
boiler as may be convenient, there is fixed a screw down self-acting
retention valve to prevent the hot water getting back to the pumps, and
on the pipes must be fixed an escape valve weighted to the required
pressure. There is also a screw down valve immediately connecting the
pipes to the boiler.
:
Circumstances may occasionally require the boiler to raise steam
before the engine starts. In that case the screw down valve immediately
connecting the pipes to the boiler must be shut and the pipes filled with
water from any convenient source, such as a tank overhead, and on one
of these pipes there is a branch with a cock attached for that purpose.
This in the ordinary course of work would only be wanted for a few
minutes, as the moment the steam rises the boiler valve may be opened
(the supply from the tank being shut), and the water from the boiler
will enter the pipes.