Improvements in or applicable to Feed Make-up Evaporators for Marine Boilers or the like.
Year: 1891

page_text: Date of Application, 6th Nov., 1891
Complete Specification Left, 6th Sept., 1892-Accepted, 8th Oct., 1892
PROVISIONAL SPECIFICATION.
Improvements in or applicable to Feed Make-up Evaporators for
Marine Boilers or the like.
I, THOMAS MUDD, of Central Engine Works, West Hartlepool, in the County
of Durham, Engineer, do hereby declare the nature of this invention to be as
follows:-
:-
This invention relates to improvements in or applicable to feed make-up
evaporators. I will describe the improvements as applied to a feed make-up for
a marine boiler or boilers.
In carrying out my invention I provide an outer casing, preferably vertical and
of either circular or rectangular section to contain the water to be evaporated.
This casing (which may be lined or coated with non-conducting material to lessen
loss of heat) may be mounted on a cross beam of the ship and convenient means are
provided for feeding the impure water thereinto. A pipe leads from its upper end
to a suitable condenser from which the pure water produced may be fed to the
boiler or boilers by any suitable feed pump or injector.
The lower end of the casing is closed by a hinged door, which is fitted at an
angle or obliquely thereto, and to this door are attached the entrance and exit ends
of several steam coils for heating the contents of the evaporator. The coils are in
the form of a number of concentric arcs or semi-circles, the centre from which they
are struck being coincident with the hinge of the door. The object of placing the
door obliquely is partly that this position will allow of longer coils being employed
than would be the case if it were placed at right angles to the sides of the casing;
it will also be obvious that the door can be opened for cleaning out the interior of
the apparatus without said coils fouling or coming in contact with the edges of the
opening. I prefer to so arrange the apparatus that the door, when released, will
fall partially open and expose the coils, thus rendering the operation of cleaning
more simple. I prefer to make the door hollow with a division dividing its interior
into two parts, into which the respective ends of each coil pass. Steam (waste or
live) being fed into one side of the division, will pass through the coils to the other
side, heating the water in the casing during its passage, and thence to the condenser
or otherwise.
The steam may be fed to the door either by means of the trunnion of its hinge,
made hollow for the purpose, or in other convenient manner. One of the great
advantages of this apparatus lies in the fact that the heating coils, being curved in
a somewhat similar manner to the tube of a Bourdon gauge, will expand and
contract with variations of temperature and will thus crack off any scale that forms
upon them.
Another advantage is the extreme facility for cleaning that this apparatus offers.
Dated this 5th day of November 1891.

page_text: COMPLETE SPECIFICATION.
Improvements in or applicable to Feed Make-up Evaporators for
Marine Boilers or the like.
I, THOMAS MUDD of Central Engine Works, West Hartlepool in the County of
Durham, 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 relates to improvements in or applicable to feed make-up
evaporators. I will describe the improvements as applied to a feed make-up for
marine boiler or boilers.
Referring to the accompanying drawings,
Figure 1 is a front elevation of the apparatus in a cylindrical form ;
Figure 2 a side elevation thereof; and
Figure 3 a vertical section with the door open.
In these-1 is the top cap, 2 the main cylindrical body part and 3 the curved
bottom part, which combined from the outer casing of the apparatus to contain the
water to be evaporated, which may be lined or coated with a non-conducting
material to lessen loss of heat. It is mounted on the cross beam or other convenient
place of a ship and suitable means are provided for feeding the impure water there-
into. The lower part 3 of the casing has a hinged door 4 to which are attached
several coils of tubes 7 in the form of a number of concentric arcs or semi-circles
for heating the contents of the evaporator. 8 is the hinge of the door by means
of which the heating tubes 7 can either be brought into the position shown in
Figure 3 ready for cleaning or can be swung into the interior of the curved shell 3
for the purpose of heating the water contained therein, the ordinary level of which
is shown at a b. 5 is the tube plate secured to door 4 by means of bolts 6.
I prefer to make the hinged door 4 hollow with divisions into which the respective
ends of each coil pass, being secured to the tube plate 5 either by expanding or
other suitable means. Steam (waste or live) being fed into one of the divisions
will pass through the coils heating the water in its passage and thence to a con-
denser or otherwise. When the door is shut, the bolts 9 secure the door and tubes
in position and make a water-tight joint. 10 is an outlet for brine or dirty water,
11 a handhole, 12 a series of perforated baffle plates for drying the steam on its
way to the steam outlet 13, where it passes away by means of a pipe, and after
condensation is fed into the boilers or other vessels. The door may be so arranged
that when released it will fall partially open, and expose the coils, thus rendering
the operation of cleaning simpler, or when the door is hinged at the top as shewn
on the drawing, the hook and eyes 14 may be used. 15 is an ordinary water gauge
and 16 an ordinary safety valve. The steam may be fed to the door 4 and thence
to the coils 7 by means of the trunnion of its hinge made hollow for the purpose,
but I prefer the arrangement shown in the drawing, in which 17 is a boss with a
hole through it leading to the interior of the door for the inlet of steam to the
coils, and cominunicating with a valve on the curved portion 3, and 18 is a similar
boss for drawing the water out of the coils. This arrangement avoids the necessity
of taking off valves or pipes when opening the door for examination or cleaning.
The hinge 8 of the door may be placed at one side and the shell made to suit, so
as to open the door horizontally or otherwise instead of vertically as shown.
19 are brackets or feet for securing the evaporator in position on board ship or
elsewhere when in use.
One advantage of this apparatus lies in the fact that the heating coils, being
curved in a somewhat similar manner to the tube of a Bourdon gauge, will expand
and contract with variations of temperature and will thus crack off any scale that
forms upon them.
Another advantage is the extreme facility for cleaning that this apparatus offers.

page_text: Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what I
claim is :-
1. The fixing of the heating coils or surface to the hinged door of feed make-up
evaporators for marine or other boilers substantially as and for the purposes
described.
2. In evaporators, arranging the tubes or coils forming the heating surface in
the manner described so as to be conveniently withdrawn from the casing for the
purpose of cleaning or examination, or swung back into the interior of the casing
for the purpose of heating the water contained therein.
3. In evaporators, the use in combination with the outer casing thereof, of a
lower curved shell or bottom section 3 constructed substantially as and for the
purposes described.
4. The general combination and arrangement of parts forming the improved
evaporator substantially as described.
Dated this 5th day of Sentember 1892.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Patent Agents for the Applicant.