Improvements in or relating to Apparatus for Effecting Circulation and Supply of Water to Steam Boilers.
Year: 1887

page_text: Improvements in or relating to Apparatus for Effecting Circulation
and Supply of Water to Steam Boilers.
I DANIEL THOMSON of 85 Canton Street, Poplar Middlesex, Engineer do hereby
declare the nature of my said invention to be as follows:-
This invention relates to certain detail improvements, or additions to, the invention
described in my previous patent No. 4491 and dated the 6th day of March in the
year 1884.
In that specification I refer to 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, said uprising water being heated in its passage to the same temperature
as the water which is within the boiler, and drawings are annexed to the said
specification to enable the said invention to be clearly understood.
Now according to my present invention I retain all the features of my said previous
patent and I fit a pipe between the feed chest and the superheating steam chamber
such pipe having a tap and also an extension leading to a donkey boiler from which
when the tap is turned to shut off the passage to the superheater it can be opened to
the Donkey boiler for a supply of steam therefrom for producing a circulation in
the main boiler while the steam in the main boiler is being raised, after which the
passage in the tap can be shifted for taking steam from the main boiler or from the
superheater attached to it.
The feed chest may have an extra tap or a valve to close the connection.
The branches instead of looking in the same direction may look in opposite directions
to each other.
H. GARDNER,
166, Fleet Street, London,
Agent for the said D. Thomson.

page_text: Improvements in or relating to Apparatus for Effecting Circulation
and Supply of Water to Steam Boilers.
DANIEL THOMSON of 85 Canton Street, Poplar, Middlesex, Engineer, do hereby
declare the nature of. this invention and in what manner the same is to be
performed to be particularly described and ascertained in and by the following
'statement:
This invention relates to certain detail improvements on, or additions to, the invention
described in the specification of my previous Patent No. 4491 and dated the 6th day
of March in the year 1884.
In that specification 1 refer to 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 and. circulation, said uprising water being heated in its passage to the
same temperature as the water which is within the boiler, and drawings are
annexed to the said specification to enable the invention to be clearly understood.
Now according to my present invention which I show in the annexed drawings
Figures 1, 2 and 3, I retain all the features of my said previous patent but in
modified form and I fit a pipe L between the tube D and the superheater or steam
chamber M, such pipe L having a tap N and also an extension P leading to a donkey
boiler, from which, when the tap N is turned to shut off the passage to the steam
chest or superheater M it can be opened to the donkey boiler for a supply of steam
therefrom which passing down the pipe L enters the pipe D through a nozzle D¹ for
creating an exhaust at the nozzle F and so draw water from the bottom of the boiler
through the branches I, I, which water enters the chamber G and passes with the
steam up the vertical pipe H for delivery into the upper part of the main boiler
through the flap valve K, thus establishing circulation; the water so taken from the
bottom of the inain boiler and forced to the upper part, being heated by said steam,
whereby the water in the main boiler will be heated while the fire in the main
boiler is being got up, but when there is sufficient steam in the main boiler E or in
the steam chest M (or it may be a superheater) the tap N can be shifted for taking
steam from the main boiler or from the superheater attached to it, said steam
acting in a similar manner to that last described for producing circulation in the
main boiler.
The branches 1, 1 instead of looking in the same direction as shown in previous
drawing, look in opposite directions to each other as in present drawing.
The above refers to producing circulation in the main boiler either by means of
steam from a Donkey boiler or from steam of the main boiler itself.
To effect a feed or supply of water to the main boiler I arrange a pipe Q in
connection with a Donkey pump and when I open the valve in the feed chest A to
which the pipe Q is attached the feed water passes through the connection R into the
pipe D and through the nozzle F, the passage of which feed water also draws water
through the branches I, I, and forces it up the pipe H and out at the valve outlet K.

page_text: I may if desired use steam from the Donkey boiler or from the main boiler while
the feed is passing into the pipe D through R to accelerate the passage of the feed, for
heating the feed as well as producing circulation in the main boiler.
The valve box S connecting the steam pipe L and the pipe D contains a non-return
valve to prevent back flow either under internal pressure in the main boiler or back
pressure taking place when the feed is on through the pipe R.
By this arrangement the usual feed chest A of a marine boiler is utilized as in the
ordinary position but is connected to the pipe D by the connection R and instead of
the pipe taking its feed from the Donkey pump only it may be from the main feed
or by a branch so that the main boiler may be charged from the Donkey pump or
from the main feed at will.
In the annexed drawings I show my invention applied to a Marine boiler, but it is
applicable to Land and other description of Boilers.
This system is specially applicable for keeping up a circulation in the main boiler
by its own steam while the Engine is at rest or when under "Banked fires."
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I claim is
1. The improvements hereinbefore described consisting of a pipe L, tap N put in
connection with a Donkey boiler by the pipe P, for utilizing the steam of the Donkey
boiler for heating and circulating the water in the main boiler before firing the main
boiler, as set forth.
2. Utilizing the pipe L, tap N pipe D, nozzle F, chamber G, and branches I, I, for
producing circulation of water in the main boiler by its own steam, as described.
3. Arranging the feed chest A and connection R with the pipe D and nozzle F,
so that the feed by its inflowing pressure causes suction through the branches I, I, a
feed and circulation being simultaneously kept up, as described.
111
101
1000
H. GARDNER,
166, Fleet Street, London,
Agent for the said D. Thomson.