Improvements in Arrangements or Appliances in connection with Steam Generators for Preventing the Priming. of Steam .orr. for Separating Water from Steam.
Year: 1890

page_text: Date of Application, 1st Mar., 1890
Complete Specification Left, 1st Dec., 1890-Accepted, 17th Jan., 1891
PROVISIONAL SPECIFICATION.
Improvements in Arrangements or Appliances in connection with
Steam Generators for Preventing the Priming. of Steam .orr. for
Separating Water from Steam.
We ISAAC SHIMWELL MCDOUGALL and JAMES THOMAS MODOUGALL both of the
firm of McDougall Brothers of 10 Mark Lane in the City of London Manufacturing
Chemists and THOMAS SUGDEN of 10 Mark Lane aforesaid Engineer do hereby declare
the nature of this invention to be as follows:-
The object of this invention is to provide in connection with steam boilers means
whereby the priming of the steam supplied therefrom is prevented that is to say the.
water which the steam from the boiler may carry up with it, is separated from the
steam and caused to return into the boiler. According to our invention we provide a
pipe or passage into which the steam passes on its way to the stop valve and in
connection with this pipe or passage another pipe passage or chamber the upper end'
of which receives the water which separates from the steam and the lower end of
which passes down to beneath the surface of the water in the boiler so that the water
separated from the steam is protected from any tendency of the steam to take it up
again and carry it past the stop valve. The apparatus arranged or constructed
according to my invention may vary but a convenient arrangement is to provide an
upper chamber or passage into which the steam from the boiler enters and along which
it passes towards the stop valve. Beneath this chamber is a lower chamber communi-
cating with the upper chamber by openings to the rear of which in the upper chamber
baffles may be placed. These intercept water carried by the steam and this water
passes by the openings into the lower chamber and therein it is protected from the
steam current and passes down therefrom by a pipe or passage leading to beneath the
surface of the water in the boiler. Or we may employ a water separator of any
suitable kind such for instance as that described in the Specification of Letters Patent
No. 17,049 dated 10th December 1887 granted to us the said Isaac, Shimwell
McDougall and Thomas Sugden this device being situated at some point in or between.
the space above the water in the boiler and the stop vaive and having beneath' it a
receptacle for the separated water and a pipe or passage leading therefrom to, beneath.
the surface of the water in the boiler.
Dated this 1st day of March 1800
J. H. JOHNSON &.Co.,,
47, Lincoln's Inn Fields, London, W.C...Agents...
COMPLETE SPECIFICATION.
Improvements in Arrangements or Appliances in connection with
Steam Generators for Preventing the Priming of Steam or for
Separating Water from Steam.
We ISAAC SHIMWELL MCDOUGALL and JAMES THOMAS MCDOUGALL both of the
firm of McDougall Brothers of 10 Mark, Lane in the City of London Manufacturing
Chemists and THOMAS SUGDEN, of 10 Mark Lane, aforesaid 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 :-
The object of this invention is to provide in connection with steam boilera means
whereby the priming of the steam supplied therefrom is prevented; that is to say, the
water which the steam from the boiler may carry up with it is separated from the

page_text: steam before it reaches the stop valve and caused to return into the boiler. According
to our invention we provide a pipe passage or chamber into which the steam passes on
its way to the stop valve and in connection with this pipe or passage is another pipe
passage or chamber the upper end of which receives the water which separates from
the steam and the lower end of which passes down to beneath the surface of the water
in the boiler the arrangement being such that the water separated from the steam is
protected from any tendency of the steam to take it up again and carry it past the
stop valve.
And in order that our said invention may be fully understood we shall now proceed
more particularly to describe the same and for that purpose shall refer to the several
figures on the annexed sheet of drawings the same letters of reference indicating
corresponding parts in all the figures.
Figure 1 is a longitudinal section and Figure 2 a transverse section of part of a
boiler provided with an arrangement according to our invention. A is an upper
chamber or passage into which the steam from the boiler enters through the
openings a at top and along which it passes, towards the stop valve B the pipe b
leading to which opens into the said chamber A. Beneath this chamber is a lower
chamber C. constituted by the partition c the said chamber C. communicating with
the
upper chamber by openings c¹ and c². D are baffles shewn separately in side
elevation front elevation and sections at right angles to each other in Figures 3. 4. 5
and 6. The said baffles each consist of a plate d of the size of the cross sectional area
of the chamber A and a plate d¹ of less size so as to leave a space between its outer
edges and the inside of the chamber A and a top plate d² of greater width than the
distance between the plates d and d' and having therein an opening a. When the
baffles are in place resting on the partition c the plates 2 completely close the upper
side of the chamber A except for the openings a in the said plates d² by which steam
is admitted thereto. There are openings at d through the baffles separated from the
spaces between the opposed surfaces of the plates da¹ by the arched plates do. These
baffles thus intercept water carried by the steam and this water passes by the
openings c c² into the lower chamber C and therein it is protected from the steam
current and passes down therefrom by a pipe or passage E leading to beneath the
surface of the water in the boiler. The steam from the boiler passes into the
chamber A by the openings, a into the spaces between the opposed surfaces of the
sides of the chamber and the plates d d' d' through the spaces between the edges of
the plates d' and the sides of the chamber past the outer sides of the plates d' and
into the channel formed by the openings d and thence to the stop valve. Water
which separates from the steam in its passage as described passes by the openings c¹³
into the lower chamber C and thence by the pipe E to the surface of the water in the
boiler and is by the arrangement described not liable to be taken up again by the
rush of steam. The baffles on either side of the pipes 6 and E are preferably
arranged with the plates d next the said pipes so that the steam passes first backward
through the spaces between the plates d d and then in the reverse direction through
the channel formed by the openings d' as shown by arrows in Figs. 3. 4. 5 and 6 on
its way to the stop valve.. The baffles are placed close together the top plates d² and
projecting feet de acting as distance pieces.
Figures 7. 8 and 9 shew in longitudinal and cross sections and in plan respectively
a modified arrangement and Figure 10 is a smaller view of the top of the chamber A
in this arrangement. In this arrangement the chamber A is separated from the
chamber C by the partition c and has pipes 6 and E connected with it as before but
the baffling surfaces are formed by tubes D passing above through the top of the
chamber A and below through the partition c. At the part of these tubes within the
chamber A the said tubes are slotted as at d the said slots being for the passage of
steam which enters at the open tops of the tubes and out by the slots d into the
chamber A and thence to the stop valve the water deposited passing down the tubes
and through openings c³ in the bottom of the chamber A into the chamber C. and
thence to the boiler as in the preceding arrangement.
The chamber A may be supported in any suitable way for instance by hangers

page_text: connected to its sides so as to leave the ends free to be removed for inspection
repair or removal of any of the parts.
We do not limit ourselves to the precise arrangements of the parts as described
provided that the surfaces in the chamber A are arranged so as to cause the water
deposited to be returned to the boiler in such a way as to be protected from the
rush of steam which would otherwise be liable to take it up again and carry it
through the stop valve.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what
I claim is :-
1st. In connection with steam boilers the combination with a passage leading to
the stop valve or steam outlet and a passage leading to beneath the surface of the
water in the boiler of a chamber provided with plates or surfaces so arranged that
they serve to protect the separated water returning to the boiler from the rush of
steam passing to the stop valve or outlet substantially as hereinbefore described.
2nd. In connection with steam boilers for the purpose described the combination
with the passage to the stop valve or steam outlet and a pissage leading to beneath
the water in the boiler of a chamber or chambers such as A, C provided with
surfaces such as the baffles or tubes D and partition c so that the water which
separates from the steam has a return way to the boiler which is protected from
the rush of steam substantially as hereinbefore described.
3rd. An appliance for the purpose described constructed substantially as herein before
described and shewn in Figures 1 to 6 of the accompanying drawings.
4th. An appliance for the purpose described constructed substantially as hereinbefore
described and shewn in Figs. 7, 8, 9 and 10 of the accompanying drawings.
Dated this 1st day of December 1890.
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, Agents.