Improvements in Preventing Radiation of Heat from Steam Boilers and Facilitating Ventilation of Stoke-holds, Engine Rooms, or like parts.
Year: 1897

page_text: Date of Application, 5th Jan,, 1897
Complete Specification Left, 5th Oct., 1897-Accepted, 6th Nov., 1897
PROVISIONAL SPECIFICATION.
Improvements in Preventing Radiation of Heat from Steam Boilers
and Facilitating Ventilation of Stoke-holds, Engine Rooms, or
like parts.
I, JOHN DANBY, of South Villa, Foggy Furze, West Hartlepool, in the County
of Durham, Marine Superintendent, do hereby declare the nature of said
invention to be as follows: :-
My invention has special reference to marine boilers and relates to the con-
struction of the "uptake" the root of the chimney and the method of application
of non-conducting compositions, especially to that known as "Danbys to such
parts of boilers, by which construction and method of application, as well as
radiation and loss of heat being prevented, destruction by the intense heat in
those parts is also prevented and the ventilation of the stoke hold and engine room
is greatly improved.
Around the "uptake" and root of the chimney I construct an air casing with
a space extending to above the ordinary hood and air casing from the deck and
this air space is closed at top but open across the front at top of the smoke box or
smoke boxes and around the "uptake" for the entry of air from the stoke hole
and engine room and from the closed in top of the casing pipes lead into the
chimney. The composition is applied on the outside of this air casing and secured
by strips and hoops extending up to the underside of the deck.
This method of construction and application of the composition ensures a rapid
upcast current of air between the "uptake" and root of the chimney and the
surrounding casing, caused by the draught of the chimney and the radiation of
heat in these parts is perfectly prevented by the outer coating of the composition.
The composition known as Danby's" above referred to is composed of wood-
wool, cement or paint of the kind described in the Specification of Patent No. 15971
of 1888, and water.
"

page_text: Improvements in Preventing Radiation of Heat from Steam Boilers
and Facilitating Ventilation of Stoke-holds, Engine Rooms, or
like parts.
I. JOHN DANBY, of South Villa, Foggy Furze, West Hartlepool, in the County
of Durham, Marine Superintendent, do hereby declare the nature of said
invention and in what manner the same is to be performed to be particularly
described and ascertained in and by the following statement:-
"
to such
My invention has special reference to marine boilers and relates to the con-
struction of the uptake" the root of the chimney and the method of application
of non-conducting compositions, especially to that known as "Danbys
parts of boilers, by which construction and method of application, as well as
radiation and loss of heat being prevented, destruction by the intense heat in
those parts is also prevented and the ventilation of the stoke hold and engine room
is greatly improved.
Around the "uptake" and root of the chimney I construct an air casing with
a space extending to above the ordinary hood and air casing from the deck and
this air space s closed at top but open across e front at top of the smoke box or
smoke boxes and around the " uptake" for the entry of air from the stoke hold
and engine room and from the closed in top of the casing pipes (or equivalent
conduits) lead into the chimney. The composition is applied on the outside of
this air casing and secured by straps and hoops extending up to the underside
of the deck.
This method of construction and application of the composition ensures a rapid
upcast current of air between the "uptake" and root of the chimney and the
surrounding casing, caused by the draught of the chimney and the radiation of
heat in these parts is perfectly prevented by the outer casing of the composition.
The composition known as Dauby's" above referred to is composed of wood-
wool, cement or paint (of the kind described in the Specification of Patent
No. 15971 of 1888) and water.
DESCRIPTION OF DRAWINGS.
Fig. 1 is an end view, one half in section of my invention as applied to a pair
of marine boilers Fig. 2 is a sectional plan of chimney on X and Fig. 3 is a side
view one half in section A A are the boilers, each having three furnaces, B B are
the smoke boxes, united by the uptake C, which carries the chimney D. The
ventilating shaft E forms an air space enclosing the fronts and outer ends of the
smoke boxes B B, the sloping sides of the "uptake" C, and the chimney D) and
extending through the main deck F and upward through the promenade deck Fi
to top of the air casing F2 where it is closed in. Near this point a number of
apertures G are provided in the chimney through which the air from the ventilator
will be drawn by the induced draught, and these apertures will be fitted with
deflecting plates P on a ring rivetted inside the chimney. Provision may also be
made for admitting the heated air from the air casing F2 and also from the
casing F, which extends from the main deck F to the Promenade deck ".
through apertures into the ventilating shaft E, and thence into the chimney D
(at points shewn marked H and H¹) whereby a current of fresh air will always
be in motion between the decks. The outside surfaces of the casing of the
'uptake'
"Cand ventilating shaft E are covered with the non-conducting
composition J and bound with hoops or straps K,
66

page_text: By this system of construction, and of the application of the non-conducting
composition, radiation of heat is almost entirely prevented, the "uptake" and
chimney are protected from the intense heat, and heated air from the "stoke-hold"
and other adjacent spaces, is effectually drawn away by the draught of the
chimney and replaced by fresh cool air.
By thus carrying the air casing, forming the ventilating shaft E some distance
above the promenade deck, the boats will escape the usual intense beat thrown
off by the old system of air casing terminating immediately above the boiler
casing, also the berths between decks will be quite cool.
In cases of working under forced draught, regulating valves may be fitted at
the points where air enters the spaces round the smoke boxes and uptake leading
into the ventilating shaft, so as to adjust the quantity of air entering, and in
certain cases, the draught of the chimney may be supplemented by a fan or
similar implement to draw or force air from the stoke hold, especially where
little movement of the atmosphere exists, as in the passage of the Red Sea and
like climates.
Having now particularly described and ascertained the nature of said inven-
tion and in what manner the same is to be performed I declare that what
I claim is: -
1st. Improvements in preventing radiation of heat from steam boilers and in
facilitating ventilation of "stoke-holds" engine rooms or like parts, consisting in
constructing around the smoke box uptake, root of chimney and chimney up to
the main deck, or upper decks according to the construction of the steamer, an
air casing forming a ventilating shaft opening at bottom into the "stoke-hold"
and at top into the chimney in such manner that the induced draught will draw
away heated air, interposing an annular column between the intense heat of the
flame and gates in the chimney and the external casing said external casing being
further protected from radiation by a non-conducting composition substantially
as described.
2nd. The combination of parts comprising the smoke box B uptake Cand
chimney D ventilating shaft E opening into the chimney by apertures G (or
equivalent passage) and covered by non-conducting composition J constructed
and operating substantially as described and shewn on the accompanying drawings.
Dated this 5th day of October 1897.