Bollers.
Year: 1886

page_text: Date of Application, 26th May, 1886
Complete Left, 29th Jan., 1887.
Complete Accepted, 1st Mar., 1887.
Bollers.
I, ROBERT DUNCAN of the firm of Ross and Duncan, Whitefield Works, Govan, in
the County of Lanark, North Britain, Engineer do hereby declare the nature of this
invention to be as follows:-
This Invention, which relates to apparatus for preventing or diminishing what is
known as priming in steam boilers, consists in causing the steam and suspended water
in their passage from the steam space of boilers to the steam pipe leading to the
engine to undergo one or more quick and acute changes of direction of motion, so
that in the course of such change or changes of direction of motion, the steam and
suspended water inay become more or less separated one from the other, until at the
final change of direction of motion, the steam and water pass from one another,
preferably in approximately opposite directions, the steam ascending into the steam
pipe leading to the engines, and the water descending into one or more pockets,
preferably of conical forin, so that the water may be gradually concentrated in the
lowest part thereof. The pocket or pockets is or are fitted with a valve or
valves opening in one direction only, namely, outwards and into the steami space of
the boiler.
The apparatus, wherein the steam and water are caused to separate from each other
in the manner hereinbefore described, inay be constructed in various forms, for
example, the steam from the steam space of the boiler may be led up into a done,
passing thence through perforations in the upper part of a conical pocket, surrounding
a vertical steam pipe, the said pocket being provided at the lower or smaller end
with the valve or valves opening outwards.
ST: JOHN V. DAY,
115, St. Vincent Street, Glasgow,
Petitioner's Agent.

page_text: COMPLETE SPECIFICATION.
Apparatus for Preventing or Diminishing Priming in Steam
Boilers.
I, ROBERT DUNCAN of the firm of Ross and Duncan, Whitefield Works, Govan, in
the County of Lanark, North Britain, 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 :-
My Invention, which relates to apparatus for preventing or diminishing what is
known as priming in steam boilers, consists in causing the steam and suspended
water in their passage from the steam space of boilers to the steam pipe leading to
the engine or to any other mechanism or apparatus in which it is to be utilized
to undergo one or more quick and acute changes of direction of motion, so that in
the course of such change or changes of direction of motion, the steam and suspended
water may become more or less separated one from the other, until at the final
change of direction of motion the steam and water pass from one another, preferably
in approximately opposite directions, the steam ascending into the steam pipe leading
to the engines or to other mechanism or apparatus wherein it is to be utilized. and
the water descending into one or more pockets, preferably of conical form so that
the water may be gradually concentrated in the lowest part thereof. The pocket or
pockets is or are preferably fitted with a valve or valves opening in one direction
only, namely, outwards and into the steam space of the boiler.
The apparatus, wherein the steam and water are caused to separate from each
other in the manner hereinbefore described, may be constructed in various forms, for
example, the steam from the steam space of the boiler may be led up into a dome,
passing thence through perforations in the upper part of a conical pocket, surrounding
à vertical steam pipe, the said pocket being provided at the lower or smaller end with
the valve or valves opening outwards.
In order that my Invention may be properly understood and readily carried into
effect, I will now proceed to describe the drawings hereunto annexed.
Figures. 1 to 5 of the accompanying sheets of drawings represent various
modifications in the construction of apparatus to effect the object of my said
Invention.
With reference to Figure 1 the steam and suspended water in the steam space at
the top of the boiler A, issue through the apertures or circular space a, of the boiler
crown into the dome 13, whence they pass through the apertures or perforations b,
formed in the upper part of the pocket . The said pocket is formed conical at its
lower part, and is provided with the hinged valve ³. Centrally within the said
pocket there is fitted the steam pipe C. The steam and suspended water pass into
the dome B, and thence through the holes b, into the pocket having a downward
motion within the pocket and thence upwards through the pipe C, and in the quick
change of motion thus produced, the suspended water falls into the lower part of the

page_text: pocket and the steam freed from water ascends from the said lower part of the pocket
through the steam pipe C, to the engines. The valve &³ is so mounted and weighted
or adjusted otherwise that it opens outwards and allows the collected water to escape
continuously or intermittently.
a
The lower part of the pocket is preferably formed with or has attached to it,
baffle plate 1, the said plate being intended to increase the area of water surface
from which the steam is most rapidly evolved, and also to prevent the water
falling from the valve 63, from mixing with the steam which is being evolved from the
surface of the water below the baffle plate D.
In Figure 2, a modification is shown in which the valve is formed of two hinged
portions, each portion being provided with a weight 6.
In Figure 3, a modification is shewn in which a flexible valve b', is employed, the
circular mouth of the said valve closing upon a cone 68.
In Figure 4, an arrangement is shown in which the valve may be regulated or
opened from without the boiler. For this purpose I employ a screwed spindle E,
actuated from the top of the steam pipe. The valve in this case is formed as a
conical plug 6, and is kept in its normal or closed position by the balanced arm F,
provided with the weight. A conical valve as shown at Figure 3, may also be
similarly adjusted from without the boiler and with or without a Hexible lip.
In Figure 5, a further modification is shewn in which the separating of the
suspended water from the steam is more completely effected by a double arrangement
of the apparatus, the steam after passing through the steam pipe C, of the first part of
the apparatus being again similarly treated by passing through a second similar
portion thereof and finally escaping very completely freed from any remaining water,
up through the steam pipe C, to the engines.
It is to be understood that the valve may be of any form other than those shewn
on the annexed drawings so long as care is taken that they open to effect the purposes
lierein described.
I would observe that I do not limit myself to the precise arrangement and
construction of parts illustrated in the drawings as the same may be subject to other
modifications in the construction of the valves, for example, and in the construction
of the valves with or without adjusting or regulating spindles or their equivalent
and whether applied to any or all of the modifications of apparatus shewn in the
drawings.
In conclusion I would observe that there are obvious modifications of the apparatus
constituting this Invention, for example, the apparatus may be arranged so that the
steam shall first enter the chamber in its central or inner part and thereafter pass to
the steam pipe by the outer part.
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 for preventing or diminishing priming in steam boilers, in which the
steam and suspended water are caused to undergo one or more changes of direction of
motion and become thereby separated by the apparatus substantially as and for the
purposes hereinbefore described.
ST. JOHN V. DAY,
Applicant's Agent.