Improvements in the Mode of and Arrangements for Ventilating Stokeholds.
Year: 1890

page_text: Date of Application, 17th Feb., 1890
Complete Specification Left, 3rd June, 1890-Accepted, 2nd Aug., 1890
PROVISIONAL SPECIFICATION.
Improvements in the Mode of and Arrangements for Ventilating
Stokeholds.
I, WILLIAM HAMILTON MARTIN, of 185 Longwall Street, Flushing, in the
Kingdom of Holland, do hereby declare the nature of this invention to be as
follows
This invention has reference to the utilization of the waste heat in stoke holds to
induce or create a current (or currents) of fresh air which being compelled to pass
under a depending bulkhead low down in the stoke hold will cause ventilation and
cooling thereof.
The heat utilized is that radiated from the heated surfaces of boilers, furnaces,
uptakes and other parts. This promotes ascent of heated air (hereinafter called the
ascending current) which I separate by certain bulkheads or partitions from the
descending fresh air (hereinafter called the descending current) so arranged that the
descending current shall be directed downward towards the stokehold floor and
then compelled to pass under the depending bulkhead or partition in such a manner
as to ventilate and keep the stokehold cool or at a temperature as near as practicable
to that on deck.
To increase the power of the ascending current I use a funnel which may be of the
same dimensions as the main funnel of the boilers, or according to another arrange-
ment the main funnel is enveloped in an outer funnel of larger diameter; an annular
space is thus formed between the two funnels and this space is used for the same
purpose, care being taken to make it of sufficient area to carry off the requisite volume
of heated air. In one arrangement the descending current is obtained by enclosing
the whole of the boilers and uptakes between two light bulkheads built airtight right
up to the deck or combing on which the ventilating funnel stands and extending the
full width of the stokehold, a suitable space (for example say from four to six inches)
being provided between the bulkheads and the smokebox or uptake. The said bulk-
heads reach down to about say for example from five to six feet from the stokehold
floor, the lower part consisting of hinged flaps to allow the smokebox door to be
opened, these flaps are fastened to the sinokebox door by light hooks of suitable
length (for example say about six inches) to allow for the necessary air space being
maintained. By thus enclosing the heated air above the boilers and preventing it
mingling with the descending fresh air, an updraught through the ventilating funnel
can be obtained of sufficient power to efficiently ventilate the stokehold.
With such an arrangement the deck of the vessel in the vicinity of the stokehold
grating can be kept clean and free from the usual smoke and dust which rise when
the fires are being cleaned or drawn ; furthermore the space above the boilers where
safety valves and other appliances are placed can be kept at a moderate temperature
allowing any work or repairs to be done with greater facility and despatch. The
entrance to this space is obtained by doors which under ordinary circumstances can
be kept closed.
As is evident the arrangement for each vessel will require to be suited to the
particular disposition of the engines and boilers.
Dated this 1712
CL1000

page_text: COMPLETE SPECIFICATION.
Improvements in the Mode of and Arrangements for Ventilating
Stokeholds.
I, WILLIAM HAMILTON MARTIN, of 141 Konigsweg, Flushing, in the Kingdom of
Holland, 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 has reference to the utilization in the improved manner and by the
improved means hereinafter described with reference to and illustrated in the drawings
annexed, of the waste heat in stokeholds to induce or create a current (or currents) of
fresh air which being compelled to pass under a depending bulkhead low down in the
stokehold will each minute during which the appliance in full operation, cause a
volume of air at least equal to the cubical contents of the entire stokehold to be
removed from it and replaced by other air, thereby effectually ventilating and cooling
the stokehold.
Referring to the accompanying sheet of drawings,
Fig. 1 is a longitudinal section through the stokehold of a vessel fitted with
double ended boiler and with ventilating arrangements according to this
invention 5
a
Fig. 2 is a longitudinal section through the stokehold of a vessel fitted with a
single ended boiler, and with modified ventilating arrangements according to this
invention.
The heat utilized is that radiated from the heated surfaces of the boiler or boilers,
smokeboxes, uptakes and other parts. This as is well understood promotes ascent of
heated air (hereinafter called the ascending current) which I separate by the herein-
after described bulkheads or partitions from the descending fresh air (hereinafter
called the descending current) these bulkheads being as will be seen so arranged that
the descending current shall be directed downward towards the stokehold floor and
then compelled to pass under the depending bulkhead or partition in such a manner
as to ventilate and keep the stokehold cool or at a temperature as near as practicable
to that on deck.
To increase the power of the ascending current I use a funnel which according to
one arrangement is of at least equal cross sectional area to the main funnel of the
boiler furnace, but the cross sectional area will depend on circumstances, the object
of my invention being to so proportion and arrange the parts so as to ensure that the
contents of the entire air space of the stokehold shall be entirely removed and replaced
once a minute; according to another arrangement the main funnel is enveloped in an
outer funnel of larger diameter; an annular space is thus formed between the two
funnels and the space is used for the same purpose care being taken to make it of
sufficient cross sectional area to carry off the requisite volume of heated air as and for
the purpose above explained.
Fig. 1 shews how the descending current is obtained by enclosing the boiler A and
uptakes B, B between two light bulkheads (, C and D, D¹ built air tight right up to
the deck or combing on which the ventilating funnel stands and extending the full
width of the stokeholds, a suitable space (for example say from 4 to 6 inches) being
provided between the bulk heads and the smoke box or uptake. The descending air
enters the stokehold E through gratings F F in the boiler hatchway, or through
wind cowls G, G or other convenient openings and passing under the depending
bulkheads or partitions enters the central compartment H containing the boiler, where
the air is heated by heat radiated from the boiler A smoke boxes A', uptakes B, and
chimney I and by direct, contact with these parts, and finally the heated air escapes
through the top of the compartment as shown.
The bulkheads: or partitions reach down to about say for example from 5 to 6 feet
from the stokehold floor, the lower parts consisting of hinged flaps C D³, respectively
to allow the smoke box doors to be opened; these flaps are fastened to the smokebox

page_text: doors by light hooks not shown, of suitable length (for example say about 6 inches) to
allow for the necessary air space being maintained. By thus enclosing the heated
air above the boilers and preventing it mingling with the descending fresh air, an
updraught through the ventilating funnel can be obtained of sufficient power to
efficiently ventilate the stokehold and keep it cool.
Fig. 1 shews the ventilating funnel as an outer funnel K enclosing the main
funnel I so as to leave an annular space between the two funnels; this arrangement
causes the current of heated air to ascend in such a manner as to materially increase
its effect in ventilating the stokehold. In the arrangement shown in Fig. 2 one
depending bulkhead or partition D D¹, only is used L, being a complete bulkhead
extending down to the floor. K is a separate funnel of the same dimensions or
thereabout as the main funnel I; its use is to promote the ascent of the current of
heated air and consequent ventilation.
By this invention the deck of the vessel in the vicinity of the stokehold grating can
be kept practically clean and free from the smoke and dust which usually rise when
the fires are being cleaned or drawn ; furthermore the space above the boilers where
safety valves and other appliances are placed can be kept at a moderate temperature
allowing any work or repairs to be done with great facility and despatch. The
entrance to this space is obtained by doors which under ordinary circumstances can
be kept closed.
As is evident the arrangement for each vessel will require to be suited to the
particular disposition of the engines and boilers.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that I do
not claim broadly the use of a funnel for ventilating a stokehold but what I do
claim is :-
1. For the purpose of utilizing the waste heat radiated from the boiler, smoke-
boxes, uptake and other parts to heat and cause ascent of air and induce or create a
downward current or currents of fresh air for ventilating a stokehold, the herein-
above described arrangement of the two depending bulkheads or partitions C C¹
and D D¹ extending to within a short distance of the floor, in conjunction with the
funnel K adapted to cause the renewal as specified of the contents of the air space
of the stokehold in the manner described with reference to and illustrated in Fig. 1
of the drawings annexed.
2. The modification shewn in and described with reference to Fig. 2.
Dated this outh day of May 1090.
W. Lloyd Wise,
W. H. MARTIN.
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.