Year: 1894

page_text: Date of Application, 13th Dec., 1894
Complete Specification Left. 4th Oct., 1895-Accepted, 9th Nov.,
1895
We, SIMPSON, STRICKLAND & Co., LIMITED, and FREDERIC STRICKLAND,
all of Dartmouth, in the County of Devon, Engineers and Launch Builders, do
hereby declare the nature of this invention to be as follows:-
Our invention relates to water tube boilers of the kind wherein an upper steam
and water drum is connected by tubes and headers to one or more water vessels
situated at the lower part of the boiler, and has for its object to construct a boiler
particularly adapted for launches and other small vessels wherein the conditions of
lightness, compactness, facility of renewal or change of parts, and accessibility for
inspection and cleaning, as well as evaporative efficiency are of first importance.
The essential feature of our improvement lies in the arranging of the connecting
and circulating water tubes in a series of independently disconnectible and
removable grid-like groups; each group comprising any desired number of super-
posed: tubes either straight and incliued or sinuous; and each tube being per-
manently brazed into a header at each end; these front and back end headers of
each separate group are or may be tubular, and arranged either more or less
vertically, the front one being connected at its upper and the back one at its lower end
to the upper and lower receivers by tubes preferably staggered and with nut and
screw connections; or, the headers connected to the lower receiver may be vertical
or inclined, and the upper headers may be arranged radially to the upper drum at
different alternate levels and connected thereto by screwed ends and nuts, the tubes
being bent or made sinuous to suit individual circumstances. In any case the
connections are such that any group of tubes can be readily disconnected when
required. The drum may be thickened about the points of connection with the
headers, and the headers may also be thickened on their tube sides, and they are
provided with screw plugs where convenient for cleaning. Heat is applied beneath
the tubes either by an oil or gas jet or a furnace, and the whole structure is enclosed
in a casing. The uptake is arranged on the casing in the most efficient position
according to the structure of any boiler, and the usual return circulating tubes. are
disposed conveniently outside the casing..
Dated this 13th day of December 1894
J. C. CHAPMAN,
Agent.
Improvements in Water Tube Boilers.
We, SIMPSON STRICKLAND & Co., LIMITED, and FREDERIC STRICKLAND,
all of Dartmouth, in the County of Devon, Engineers and Launch Builders, 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 :-
Our invention relates to water tube boilers of the kind wherein an upper steam

page_text: and water drum is connected by tubes and headers to one or more water vessels
situated at the lower part of the boiler, and has for its object to construct a boiler
particularly adapted for launches and other small vessels wherein the conditions of
lightness, compactness, facility of renewal or change of parts and accessibility for
inspection and cleaning, as well as evaporative efficiency are of first importance.
The essential feature of our improvement lies in the arranging of the connecting
and circulating water tubes in a series of independently disconnectible and
removable grid-like groups; each group comprising any desired number of super-
posed tubes either straight and inclined or sinuous; and each tube being per-
manently brazed into a header at each end, the headers tubes and component parts
of the boiler being formed, disposed and arranged practically as is hereinafter fully
explained in reference to the drawings hereto annexed exemplifying our invention
and forming part of this Specification: Figure 1. is a longitudinal section, Figure 2.
a left front end elevation with casing removed of one form of our new construction
Figure 3. is an elevation with part of the casing broken away and Figure 4. is to
the right a section on line 1-2 of Figure 3. and to the left a sectional elevation at
back of furnace showing rear waterlegs. Referring to Figures 1 & 2. A is the
upper steam and water drum, B a lower water vessel arranged parallel thereto at
the back of the boiler; H'H' are respectively the front and back headers of a grid-
like group of superposed straight inclined tubes T permanently brazed thereinto at
each end. The headers and tubes of each such gridlike group as in the same
vertical plane and the groups are parallel with one another, the headers of each
separate group of tubes T are preferably tubular and arranged with a slight incline
to facilitate the rising of steam-bubbles-the front headers H are extended and
connected at their upper ends by the curved tubes H2 to the upper or steam space
of the drum A at a, and they are preferably staggered thereat as shown.
The lower ends of the rear headers H¹ are staggered and connected to the lower
water vessel B by screwed meeting ends and nut connections as shown at b: R is
the return water pipe from drum A to vessel B. F is the fire box which is lined
with refractory material f, the whole being enclosed in a casing C surmounted by
chimney D and the flames and products of combustion pass direct upwards thereto;
SS are screw caps and plugs for access to and cleaning of the druin and vessel B.
By simply breaking the connections at a and
any group of tubes T and their
headers H H can be at once and readily removed when required without interfering
with the rest, and the holes are to be plugged up if the boiler is to be worked
before replacement.
Referring now to Figures 3 & 4 wherein the same letters are employed to
designate parts similar or equivalent to those above specified the lower headers H¹
may be as shown vertically arranged and having their lower ends staggered and
fixed at bas above described by screw and nut connections to a pair of lower water
vessels B B arranged at each side by the fire box F: these headers H' may be
inclined if desired to facilitate escape of steam.
The upper headers H are arranged radially to or projecting horizontally from
the upper drum A at different alternate levels as shown, and they are each connected
thereto at a by expanding or by screwed ends or nuts in the usual way, or as may
be most convenient. Each pair of headers H H' is in the same vertical plane, and
the water tubes T connecting same are bent or made sinuous in some such form as
is illustrated; each separate group of tubes may consist of one or more rows of
tubes placed side by side and of the same or different sizes to suit varying conditions
of heating surface required. In Fig. 3, two parallel rows of side by side tubes T T
are illustrated connecting each pair of headers H H₁; of these the lower-most pair
is shown of larger diameter than the upper ones, and staggered at their junctions
with the headers H'. The separate groups are parallel one with another and in
every case the connections at ab are such that any group of tubes T T¹ with their
headers H H' can be readily disconnected when required as above described. The
drum A is or may with advantage be thickened at a a the points of connection of
the upper headers H H, and the headers H and H₁ may also be thickened on the

page_text: tube sides for the better fixing of the tubes, and each header is provided with screw
plugs S. S. or equivalent holes and covers where convenient for cleaning.
The back of the fire box is formed by water legs L L reduced and connected by
screws and nuts to and communicating with the cross water vessel B' and with the
drum A as shown; R R are the return pipes from drum to side vessels B B con-
nected as shown or in any suitable way. Heat is applied beneath the tubes T T
in the box F by an oil or gas jet or a furnace, and the whole structure is enclosed
in a casing C; the uptake D is arranged in the most efficient position according to
the structure of the boiler; the flames and gases passing up thereto between and
amongst the tubes, headers and water legs.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
(1.) In a water tube steam boiler, arranging the circulating water tubes and
headers connecting the upper and lower vessels in a series of independently discon-
nectible gridlike groups either straight and inclined or sinuous, and in parallel
vertical planes so that any group can be removed without reference to the rest,
substantially as above set forth.
(2.) The several arrangements of water tube boilers embodying our invention
above claimed, substantially as described and illustrated respectively in Figs. 1, 2,
3. 4. of the annexed drawings.
4. of the annexed drawings.
Dated this 2nd day of October 1895.
For the Applicants,
J. C. CHAPMAN,
70, Chancery Lane, Loudon, W.C., Chartered Patent Agent.