AN IMPROVED METHOD OF AND APPARATUS FOR EFFECTING CIRCULATION IN, AND SUPPLY OF WATER TO, STEAM BOILERS to be as follows:
Year: 1884

page_text: PROVISIONAL
SPECIFICATION,
I DANIEL THOMSON of 85 Canton Street, Poplar in the county of Middlesex
Engineer do hereby declare the nature of my said invention for "AN IMPROVED
METHOD OF AND APPARATUS FOR EFFECTING CIRCULATION IN, AND SUPPLY OF
WATER TO, STEAM BOILERS to be as follows:-
"
The object of this invention is a method of ensuring a perfect circulation of
water in marine and like boilers by withdrawing a portion of the water from the
bottom of a boiler and forcing it up along with a fresh supply to the top or near
thereto for distribution there with said uprising water being heated in its passage
to the same temperature as the water that is within the boiler.
For the purpose of my invention I attach to a box pipes leading from the donkey
feed and the main feed. From this box I lead a pipe into the boiler at or as near
as possible at the lower part. The opposite end of this pipe is encased by a sleeve
with a clearance at its extreme end forming a suction thereat. The sleeve has one
or more branches leading from it with the ends exposed in the water where
sediment is likely to form or any deposit take place. The sleeve at the juncture
narrows in and is continued up to about the water level in the boiler where it
ends with a spout or turn over provided with a flap valve through which the water
from the pipe is delivered.

page_text: I DANIEL THOMSON of 85 Canton Street, Poplar in the County of Middlesex,
Engineer, do hereby declare the nature of my said invention for:-" AN IMPROVED
METHOD OF AND APPARATUS FOR EFFECTING CIRCULATION IN, AND SUPPLY OF
WATER TO, STEAM BOILERS," and in what manner the same is to be performed
to be particularly described and ascertained in and by the following statement :-
The object of this invention is, a method of ensuring a perfect circulation of
water in marine and like boilers by withdrawing a portion of the water from the
bottom of a boiler and forcing it up along with a fresh supply to the top or near
thereto for distribution therewith, said uprising water being heated in its passage
to the same temperature as the water that is within the boiler.
My invention is clearly shown in the annexed drawings in which I show it
affixed within a marine boiler. A is a feed chest with pipes B C leading from the
donkey feed and the main feed respectively. This feed chest has also a pipe D
which passes into the boiler E at the lower part thereof.
1
The opposite or free end F of the pipe D is encased by an internal suction 1
chamber G with a clearance between them, the extreme end slightly entering a
continuation H of reduced diameter for creating a suction in the sleeve by the
passage of water from the feed or the donkey pump or from both as desired.
The internal suction chamber G has one, two, or more branchos I I leading from
it with the ends perforated 'or exposed in the water of the boiler where the water 2
becomes stagnant.
The pipe H is continued up to about the water level in the boiler where it ends
with a pipe
J turned over horizontally provided with a flap valve K through which
the water from the pipe is delivered.
By this invention a quantity of water is removed from the bottom of the boiler 2
at each stroke of 'the feed pump and it is forced along with the feed water to tho
upper part of the boiler where its discharge takes place to cominingle with the
body of water in the boiler. This ensures perfect circulation and constant
agitation, the tenperature of the feed water being raised to that of the sur-
rounding water during its passage up the discharge pipe to the valve which closes
against the passage of steam or water into the pipe. Thus sediment is prevented
accumulating to corrode the bottom of the boiler, priming is obviated and clean
steam is always available for use in the engines advantages of the greatest
importance to oceangoing steamers, because the wear of the steam valves and
pistons is considerably reduced; the condenser is kept free from accumulation, fuel 3
is saved and a more satisfactory working of the engines is obtained.
The agitation of the water naturally produces a scum on the surface and to
remove this, each boiler should be scummed every six hours for three days after
getting steam up. Generally the amount of scum to be removed at those periods is
about one to one and a half inches from the gauge glass, but after that time the 4
scumming can be done once every twelve hours for say two or three days and then
once in every twenty four hours during the voyage extra feed making up for the
quantity scummed.
In practice the Salinometer should stand in the water drawn from the boiler
at density, the boiler will thus be free of sediment and there will be but a 4
very thin scale attached to the parts of the boiler in direct contact with the water.

page_text: Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is
The apparatus substantialy as shown in the annexed drawings for effecting
circulation in and supply of feed water to boilers as described.
The 29th day of November 100%
H. GARDNER,
166, Fleet Street, London,
Agent for the Applicant.