Improved Water Tube Boller.
Year: 1895

page_text: Date of Application, 15th May, 1895--Accepted. 29th June, 1895
COMPLETE SPECIFICATION.
Improved Water Tube Boller.
I, JOHN PERCY HALL, of Carville, Laurie Park Road, Sydenham, in the
County of Kent, Managing 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 my invention is the construction of steam boilers or generators
suitable for sea going on other vessels, or other purposes, where high pressmes,
lightness and rapid generation of steam are required
I construct a steam generator with two chambers or drums, placed one above the
other and connected together by water tubes. The lower drum is a water chamber
only and the upper drum is partly a water chamber and partly a steam chest, tho
connecting tubes branching out in a horizontal downward slope from one side of the
upper dium, and descending vertically till they bend back by another horizontal
downward slope to jom the lower drum; thus forming rows of tubes, each row
consisting of tubes bent as described, behind each other and running parallel to
one another, except at the ends which are bent to enter the circulai druins at right
angles and are expanded into the plates thereof The position of each tube in a
row will be on a vertical line ou the cn cumference of each drum, or the tubes may
bo pitched zigzag about such line, the outer tube being removable without
distu bing its neighbour on either side or the tube belund it in the same row. In
case of defect in any one tube only itself & those in frout of it in the same row
will have to be drawn These rows of tubes extend the whole length of the drums
which are so arranged that all the tubes can be drawn out into the stokehold.
I also place a row of vertical tubes on the other side of diums close together
and forming a wall on this side for the purpose of collecting any heat which might
otherwise escape on this side.
The fire grate is placed under the bottom slope of the outor tubes at a convenient
distance below them
The outer tubes are necessarily the longer & most flexible & come first into
contact with the flame of the furnaces, these take up the greater portion of the heat
leaving the inner or shorter tubes exposed to less temperature
The whole of one or more such boilers, except the ends of the drums, is encased
in brickwork, tiles, iron or any suitable casings, with or without non conducting
protection & the waste products of combustion led away in the usual manner
The drums are connected at each end outside the casings with large vertical
downcast pipes.
In order that my said invention may be fully understood and readily carried into
effect I will proceed to describe the drawings annexed.
OF THE DRAWINGS
Fig. 1 is a vertical section of the boiler in accordance with my invention
Fig. 2 is a side elevation of the boiler with eud casing removed.
Fig 3 & 4 are outside elevations of the boiler.
In Fig. 1 & 2, a is the upper or steam and water chamber, is the lower or
water chamber, care the upcast water tubes connecting the two chambers and
expanded into the plates approximately in the positions shewn-these tubes are
sloped downwards from one side of the upper chamber a for the necessary distance
and then take a vertical downward direction, sloping again to hnally join the lower
Fig. 1 is a vertical section of the boiler in accordance with my mvention
Fig. 2 is a side elevation of the boiler with end casing removed.
Fig 3 & 4 are outside clovations of the boilor.
In Fig. 1 & 2, a is the upper or steam and water chamber, is the lower or
water chamber, care the upcast water tubes connecting the two chambers and
expanded into the plates approximately in the positions shewn-these tubes are
sloped downwards from one side of the upper chamber a for the necessary distance
and then take a vertical downward direction, sloping again to hnally join the lower

page_text: chamber bas substantially shown on the drawing, d d are placed outside the casing
and are downcast water tubes connecting the chambers a & b, c is a row of downcast
water tubes connecting the two chambers a & band being placed close togethor
forms a wall through which the flame cannot pass, is the casing consisting of one
or more plates with air space or any form of lagging which may be preferred, 9 19
the fire grate which may be as shewn or at right angles to this position with respect
to the boilo, and is placed at auy convenient distance below the tubes, may be of
fire brick, tiles, fire clay or any other kind of furnace construction, is a fre
door, is the uptake leading to the chimney
The chambers a & bare furnished with doors at each end for purposes of
construction, examination and repair Ordinary mountings such as steam stops,
internal steam pipes, safety valves, water gauges, feed valves &c are fitted as
usual.
Having now particularly described and ascertamed the nature of my said inven-
tion, and in what manner the same is to be performed, 1 declare that what I
olaun is :-
A steain generator or boiler substantially as described, consisting of an upper
steam & water chamber and a lower water chamber situated immediately below it,
or nearly so, aud connected by water tubes projecting from one side of and slightly
inclined downwards away from the upper chamber then downwards vertically or by
a simple downward curve, afterwards returning inwards on a slightly downward
inclination to the lower chamber and connected again by one or more tows of
vertical water tubes set close together to form a wall on the other side of these
upper & lower chambers, there being larger water tubes at each end forming a
vertical downcast connection between the upper and lower chambers outside the
tire and I claim the above in connection with a ne grate situated below the
whole set of inclined water tubes substantially as described and illustrated by
the annexed drawings.
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