IMPROVED APPARATUS FOR PURIFYING THE FEED WATER OF STEAM BOLLERS
Year: 1880

page_text: PROVISIONAL SPECIFICATION left by William Hanson at the Office of
the Commissioners of Patents on the 10th August 1880.
WILLIAM HANSON, of Bradford, in the County of York, Engineer and Machine
Maker. "IMPROVED APPARATUS FOR PURIFYING THE FEED WATER OF STEAM
BOLLERS."
This Invention relates to improved apparatus for removing from the water
employed in feeding steam boilers impure and organic matter, such as carbonates of
lime, oxide of iron, silica, and sulphuric acid, preventing deposits or incrustation
in steam boilers, producing a great saving in fuel, and in the wear and tear of
the boilers.
For this purpose in any suitable position near a boiler is fixed a purifying
apparatus, which is constructed by preference with a cylindrical wrought iron shell
or casing. The bottom of this casing is made with a flange which fits and is secured
on a top flange of a cast iron tube frame, which is secured to a bottom foundation
frame; in the circular tube frame are fitted tubes which are made by preference of
brass; these tubes are fitted inside the shell and extend nearly two thirds the
length of the casing. The tops of the tubes are secured in a top plate having a
flange on which is secured a curved cover, leaving steam room inside the cover. On
the top of the cover is formed a boss and opening, and on the top surface of the
boss is secured the flange of a copper steam pipe, which is also secured to the inside
face of a block which is fitted to the casing or shell; the copper steam pipe is coiled
so as to expand.
The bottom of the tube frame is made with a chamber to which is fitted a tap,
which is connected to a discharge pipe, and the bottom of the foundation plate is
made also with a chamber having a boss and opening, and to which is fitted a
condensed water pipe, which is connected to other pipes which discharge the
condensed water into the boiler or boilers; check valves are fitted to the boilers.
To the shell and near the bottom of the tubes is fitted a block having an opening
leading to the interior of the shell, To the block is secured a three-way tap to
which is secured the feed pipe leading to the feed pump, and on the top of the tap
is secured a pipe which is connected to a block fitted in the top part of the shell,
and below the opening of the block and inside the casing is fitted a filter which is
made of carbon placed in a box having a perforated bottom and cover; the top of
the shell is fitted with a cover.

page_text: The feed water from the feed pump passes through the feed pipes and through
the three-way tap, which has been left open, and enters the casing or shell and fills
up the casing.
Steam of 70 lbs. boiler pressure is employed by preference, which passes through
the copper coiled pipe and through the cover and brass pipes which heats the feed
water in the casing, and steam of 70 lbs. pressure contains 320 degrees of heat, and
which heat being taken up by the feed water, causes the organic matters to be
dissolved and precipitated in the bottom of the casing, the carbonates of lime
dissolving with a heat of 260 degrees, oxide of iron and silica with 212 degrees,
and sulphuric acid with 260 degrees; these organic matters are forced by the pressure
of the water through the chamber of the tube frame, and through a tap into a sludge
discharge pipe into a sewer or any other suitable receiver, any other light or
greasy matter which may be contained in the feed water being pumped in the
cistern to pass through the carbon or filter, leaving pure water to pass into a series
of pipes leading to the feed pipe or feed pipes of the boiler or boilers. Check valves
are fitted to these pipes.
Any condensed water falls in the condensed water cistern and passes through
pipes to the boilers; there is no waste of steam, as the steam employed to precipitate
the organic matters heat the feed water, and any condensed steam is returned to
the boiler in a pure and heated state.
To cleanse the filter, the three-way tap is closed to the cistern and opened to
the pipe fitted on the top of the tap; the feed water being pumped in passes
up the pipe and falls on the top of the filter, forcing the water through the filter or
carbon into the cistern, and to renew the carbon when required the top cover of the
cistern is removed and the filter lifted out.