XP
Year: 1886

page_text: Date of Application, 13th Apr., 1886.
Complete Left, 30th Dec., 1886.
Complete Accepted, 1st Feb., 1887.
[Communicated from abroad by LA SOCIÉTÉ ANONYME COOPERATIVE POUR LA
CONSTRUCTION DE CHAUDIÈRES INEXPLOSIBLES, of 1, Boulevard St. Denis, Paris,
France, Manufacturers.]
1 JOHN CLAYTON MEWBURN, of 169 Fleet Street, in the City of London, Fellow
of the Institute of Patent Agents do hereby declare the nature of this invention to be
as follows:-
This invention has reference to multitubular boilers in which the water to be
evaporated is caused to travel through a series of inclined tubes while such tubes are
acted upon externally by the flame and products of combustion from the furnace.
The improvements mainly consist: first, in constructing the boiler of a set of
groups of three tubes which are free to dilate, one of these tubes leading in an
upwardly inclined direction from a vertical steam collecting box at the back of the
hoiler and conveying the water to a water compartment at the front while the
other two tubes lead also in an upwardly inclined direction from the water
compartment to the steam collecting box; secondly in constructing the lowest water
compartments to receive two tubes and in combining them with the lower supply pipe
or chamber thirdly in constructing the other or normal water compartments to
receive three tubes, these compartments being of approximately V-form so as to rest.
one upon another; fourthly in the mode of fitting and holding the tubes, which have
conical ends, in the water compartments and steam collecting boxes by means of
anchor bolts the anchor taking hold of the tube which is formed with holes to receive
it and being capable of disengagement after removal of a cover so that the tube may
be got at for cleaning; fifthly in the general combination of the groups of tubes thus
arranged and forming a number of sets, with a lower supply pipe or chamber, with an
upper or main steam collector, a steam reservoir, a steam dryer and a box or pipe for
the collection and discharge of sediment; and sixthly in fitting flame tubes within
the water tubes.
I will proceed to describe the construction of a boiler in which the improvements
are embodied. Above the water tube chamber is a chamber forming a steam and
water reservoir at the upper part of which is an inlet for steam from the upper or main
steam collector and an outlet for steam to the dryer while from the lower part of the

page_text: reservoir is a pipe to convey water therefrom to a supply pipe or chamber below the
water tubes; the feed water is thus conveyed to this chamber, that is to say if the
water be supplied to the reservoir. Below the pipe that conveys the water from the
reservoir is a box or pipe, fitted with a discharge cock, for collecting and discharging
sediment. At the front of the boiler are water compartments superposed in vertical
sets and at the back of the boiler are vertical steam collectors equal in number to the
sets of water compartments, or there may be one common collector. The lowest water
compartment of each set is in communication with the supply chamber above described
and is connected by two upwardly inclined tubes with the steam collector at the back
of the boiler. The other water compartments each communicate with the steam
collector by three inclined tubes of which two rise from the water compartment to the
steam collector while the other rises from the steam collector to the water compartment.
These three tubes constitute a group or complete element. Above the steam collectors
is the main collector which conducts the steam to the reservoir before described from
which reservoir a pipe conveys the steam to the dryer; this is within the reservoir and
is composed of tubes; from this dryer the steam supply for the engine or other purpose
is taken. Each water compartment and each vertical collector has at its outer face as
many openings as there are tubes communicating therewith and these openings are
fitted with covers which can be removed when it is required to clean the tubes; at the
front of the boiler are corrugated or undulating sheet iron doors to enclose the water
compartments. When internal flame tubes are used they are fitted within the tubes
that rise from the water compartments to the steam collectors and they extend at their
front end through the water compartment and at, their back end through the steam
collectors the flames after having acted upon the outside of the sets of tubes return to
the front of the boiler, enter the flame tubes and pass out at the back end thereof to the
chimney. As has been already described each of the water tubes is formed at the ends
with holes to receive the arms or flukes of an anchor bolt and this, when in place, is
tightened up by a nut so as to draw the external cone or taper of the tube end against
a corresponding cone of the aperture in which the tube fits and thereby make a dry
metallic joint. Instead of the tube ends being tapered they may be formed with a
ring or boss to make joint with the cone of the aperture in which the tube fits;
this ring or boss may be in a piece with the tube, or be a ring of copper or
brass let into it.
:

page_text: Ins improvements mainly consist nrst in constructing the boiler of a set or sets of
groups of three tubes which are free to dilate, one of these tubes leading in an
upwardly inclined direction from a vertical steam collecting box at the back of the
boiler and conveying the water to a water compartment at the front while the other
two tubes lead also in an upwardly inclined direction from the water compartment to
the steam collecting box; secondly in constructing the lowest water compartments to
receive two tubes and in combining them with the lower supply pipe or chamber:
thirdly in constructing the other or normal water compartments to receive three tubes,
these compartments being of approximately V-form so as to rest one upon another
fourthly in the mode of fitting and holding the tubes, in the water compartments and
steam collecting boxes by means of anchor bolts the anchor taking hold of the tube
which is formed with holes to receive it and being capable of disengagement after
removal of a cover so that the tube may be got at for cleaning; fifthly in the general
combination of the groups of tubes thus arranged and forming a number of sets, with
a lower supply pipe or chamber, with an upper or main steam collector, a steam
reservoir, a steam dryer and a box or pipe for the collection and discharge of sediment ;
and sixthly in fitting flame tubes within the water tubes.
;
I will proceed to describe with the aid of the annexed drawings the construction of
a boiler in which the improvements are embodied. Figure 1 is a front view of the
boiler with its furnace; the set of groups of tubes to the left hand is seen in end view
and the next set in section; the other sets are concealed by the door Q. Figure 2 is
a longitudinal section. Figure 3 is an elevation of the rear end. Figure 4 is a
longitudinal elevation. Figure 5 is a longitudinal section of a modification which
differs from that represented in the preceding figures in that there are return flame
tubes within the water tubes. Figures 6 to 12 are detail views hereinafter described.
Referring first to Figures 1 to 4, A is a chamber forming a steam and water reservoir
at the upper part of which is an inlet for steam from the upper or main steam
collector and an outlet from which steam passes through the pipe L to the dryer M.;
from the lower part of the reservoir A a pipe B conveys water therefrom to a supply
pipe or chamber D below the water tubes; the feed water is thus conveyed to this
chamber, that is to say-if the water be supplied to the reservoir A and not directly
to the pipe D. Below the pipe B is a box or pipe C, fitted with a discharge cock, for
collecting and discharging sediment. At the front of the boiler are water compart-
ments E, G, G superposed in vertical sets and at the back of the boiler are vertical
steam collectors J, J equal in number to the sets of water compartments, or there may
be one common collector. The lowest water compartment of each set is in com-
munication with the supply chamber D and is connected by two upwardly inclined
tubes F, F with the steam collector J at the back of the boiler. The other water
compartments G, G (which are of approximately V-form so as to rest upon one another
as seen in Figure 1) each communicate with the steam collectors by three inclined
tubes of which two II rise from the water compartment to the steam collector while the
other H rises from the steam collector to a higher water compartment. These three
tubes constitute a group or complete element. The feed water flows from the pipe or
chamber D through the tubes F to the collectors J and the collectors serve to feed the
several groups or elements. The tube H of each group conveys water from the
collector to the water compartment G which distributes it to the tubes I I. The steam
formed in the tubes II and I follows the same course as the water and readily disengages
at the ends of the tubes 1 into the collectors J. Above the collectors J is the main
collector K which conducts the steam to the reservoir A from which reservoir the
pipe L conveys the steam to the dryer M; from this dryer the steam supply for the
engine or other purpose is taken through the valve N. Each water compartment and
cach vertical collector has at its outer face as many openings as there are tubes com-
municating therewith and these openings are fitted with covers P which can be
removed by first releasing the nuts O of the anchor bolts when it is required to clean
the tubes; at the front of the boiler are corrugated or undulating sheet iron doors Q
to enclose the water compartments. R, R represent the furnace and its doors and S, S
the ash pit and its doors. When internal flame tubes are used (see T, T Figure 5) they

page_text: are fitted within the tubes that rise from the water compartments to the steam collectors
and they extend at their front end through the water compartment and at their back
end through the steam collectors; the flames after having acted upon the outside of the
sets of tubes return to the front of the boiler, enter the flame tubes and pass out at
the back end thereof to the chimney. It has already. been stated that each of the
water tubes is formed at the ends with holes to receive the arms or flukes of an anchor
bolt and this when in place is tightened up by a nut so as to draw the external cone or
taper of the tube end against a corresponding cone of the aperture in which the tube
fits and thereby make a dry metallic joint. This is represented on a larger scale in
Figures 6, 7 and 8. In these figures A represents the water tube. a, a are the holes
therein. is the anchor bolt whose arms or flukes enter the holes a, a.
collector in which the end of the tube A is mounted. The orifice is tapered and the
end of the tube A. is likewise tapered. D is a cover to the opening in the outer face
of the collector Band E is a nut for locking the anchor bolt C. Instead of the tube
ends being tapered they may be formed with a ring or boss b, Figure 9, or e, Figure 11,
or h, Figure 12 to make joint with the cone of the aperture in which the tube fits;
this ring or boss may be in a piece with the tube or be a ring of copper or brass let
into it as represented at d, Figure 10.
B is the
Having now particularly described and ascertained the nature of my said invention,
and in what manner the same is to be performed, as communicated to me, I declare
that what claim in respect of multitubular boilers is :-
1. Constructing boilers with groups of three tubes free to dilate, one tube of each
group rising from a vertical steam collector to a water compartment, and the other two
rising from a water compartment to a vertical steam collector, substantially as
described and shown in the drawings.
2. The combination with groups of three tubes arranged as referred to in claim 1,
of a bottom water compartment arranged to receive only two tubes, and of a lower
water supply pipe or chamber, substantially as described and shown in the drawings.
3. Constructing the upper water compartments to receive each three tubes and of
approximately V-form as and for the purpose described and shown in the drawings.
4. The mode or modes of fitting and holding the tubes in the water compartments
and steam collectors by means of anchor bolts which engage with holes in the sides of
the tubes and which are capable of being disengaged, all substantially as described
and shown in the drawings.
5. The combination of groups or sets of tubes, their water compartments and steam
collectors, a lower water supply pipe or chamber, an upper or main steam collector, a
steam reservoir, a steam dryer and a box or pipe for the collection and discharge of
sediment, substantially as described and shown in the drawings.
6. The combination with groups of tubes, arranged as referred to in claim 1, of
Hame tubes within the tubes that rise from the water compartments to the steam
collectors, as shown in Figure 5 and hereinbefore described.
7. The combination or arrangement of parts constituting an improved multitubular
boiler as herein before described and represented in Figures 1 to 4.