IMPROVEMENTS IN ARRANGEMENTS FOR HEATING FEED WATER OF MARINE BOILERS
Year: 1885

page_text: I, JOHN TWEEDY, of West Lodge, Walker, in the County of Northumberland,
Engineer, do hereby declare the nature of said invention for "IMPROVEMENTS
IN ARRANGEMENTS FOR HEATING FEED WATER OF MARINE BOILERS" to be as
follows:-
This invention has for its object improvements in the arrangement of feed
heaters, or auxiliary surface condensers used on board ship. In carrying out this
invention I fit two condensers, combined in one casting, or entirely separate from
each other and fit pipes and valves or cocks so arranged in connection with them
that the feed water, on its way from the feed pumps to the boilers, passes through
one of the condensers, into which the steain to be condensed for ships use is
admitted. By this means most of the heat of the steam is taken up by the feed-
water and is conveyed back to the boiler instead of being discharged overboard as
at present.
The temperature of the condensed steam is further lowered by passing it
through the second condenser supplied with cold water by one of the pumps or
otherwise.
Suitable valves and connections are provided for shutting off the feed-water
from the condenser when fresh water is not required on deck, and for converting
one of the condensers into an ordinary feed-water heater supplied by steam from
the boilers or from any of the engine steam-chests and the other into an ordinary
condenser or distiller,

page_text: I JOHN TWEEDY of West Lodge Walker, in the County of Northumberland,
Engineer, do hereby declare the nature of said invention for "IMPROVEMENTS.
IN ARRANGEMENTS FOR HEATING FEED WATER OF MARINE BOILERS "
to be
particularly described and ascertained in and by the following statement :--
This invention has for its object improvements in the arrangement of feed-
beaters or auxiliary or surface condensers used on board ship. In carrying out
this invention I fit two condensers, combined in one casting, or entirely separate
from each other, and fit pipes and valves or cocks so arranged in connection with
them that the feed waters, on its way from the feed pumps to the boilers, passes
through one of the condensers into which the steam to be condensed for ships use
is admitted. By this means most of the heat of the steam is taken up by the feed-
water and is conveyed back to the boilers instead of being discharged overboard
as at present.
The temperature of the condensed steam is further lowered by passing it through
the second condenser supplied with cold water by one of the pumps or otherwise
Suitable valves and connections are provided for shutting off the feed-water from
the condenser when fresh water is not required on deck, and for converting one of
the condensers into an ordinary feed heater supplied by steam from the boilers or
from any of the engine steam-chests, and the other into an ordinary condenser or
distiller.
DESCRIPTION OF DRAWINGS.
In order that my said invention may be properly understood I herewith append
a sheet of explanatory drawings showing how the various connections may be
made in carrying out this invention-In these drawings the same reference letters
and numerals are used to mark the same or like parts wherever they are repeated.
The general features only of the arrangement are shown, and it is to be understood
that any parts or details which are not delineated or described are to be constructed
and arranged as in existing steam ships or in an analogous manner.
The auxiliary condensers, distillers or feed heaters are shown in the drawings
grouped on the back of the main condenser, but I do not of course limit myself to
this position, and the condensers may be varied in number and in their relative
positions, or there may be only one condenser.
, Various modifications may be made in the connections, illustrations of three
such modifications are shown by Figures 1, 2 and 3-In all these modifications the
main feed pump or pumps A are placed in connection with the auxiliary condenser
or condensers B (which may be of any construction as to the internal arrangements
of condensing water and steam relatively to each other) by the pipe C, the feed
water flowing through the condenser takes up heat from the steam admitted to the
condenser by the pipe M and passes on to the boiler through the cock or valve 2

page_text: and the pipe D. The pipe M may be in connection with the main and donkey
boilers, with the main engine steam chests and exhausts and with the winches and
other auxiliary engines, but by preference this pipe is reserved for the supply of
steam from the donkey or auxiliary boiler, and the other connections are made to
the condenser through the pipe M¹, and the pipe K, the pipe K is by preference
connected only to the exhaust side of the winches and auxiliary engines. The
steam after condensation or partial condensation may be taken direct from the
condenser B or by the pipe G for use in the main engines or elsewhere but when a
low temperature is required the condensed steain, or partially condensed steam, is
caused to pass through the pipe H to the condenser Q supplied with cold water by
any of the pumps through the pipe N, thence it passes through the pipe R to the
fresh water tanks or other desired place.
When heated feed water is not required, the feed water is forced direct to the
boilers through the valve 3 and pipe D and the apparatus becomes an ordinary
condenser supplied with condensing water from the usual sources through the
pipes E.
The apparatus is also available for use as a winch condenser as described
in my patent 1883 N° 898, K being the exhaust pipe from the winches and
auxiliary engines, E the cold water supply pipe and G, the auxiliary air pump.
donkey suction.
Having described my said invention for "Improvements in arrangements for
heating feed water of Marine Boilers" and having explained the manner of carrying
the same into practical effect I desire to have it understood that I do not, save and
except as hereinafter mentioned, claim any of the mechanical parts of the apparatus
herein before shewn and described when taken separately and apart from the
combination or application thereof, in manner and for the purpose herein described,
but what I consider to be novel and original, and therefore claim
as my
invention is
First The arrangement and application of feed heaters, distillers or auxiliary
condensers on board ships in such a way that the condensation or partial condensa-
tion of steam for general use on board ship may be effected by the main feed water
instead of by water from the sea, substantially as shewn and described.
Second The arrangement and application of auxiliary condensers in such a way
that they may be used to condense exhaust steam from the winches and other
auxiliary engines substantially as shewn and described.
Dat the 70th JT.1 10OK