Improvements in Water Tube Steam Generators.
Year: 1899

page_text: Date of Application, 10th June, 1000
Complete Specification Left, 13th Mar., 1900-Accepted, 21st Apr., 1900
Complete Specification Left, 13th Mar.. 1900-Accepted, 21st Apr., 1900
PROVISIONAL SPECIFICATION.
Improvements in Water Tube Steam Generators.
We, HENRY JOHN CHARLES PATTISON and JOHN ALFRED PATTISON, both of the
Engineering Works, Granili, Naples, Italy, Engineers, do hereby declare the
nature of this invention to be as follows:-
Our invention relates to certain improvements on the type of boiler described
in the Specification of Letters Patent No. 14639 of 1898.
In this class of boiler a group or groups of "Field" or like tubes are arranged
beneath an upper collector or collectors such groups when two are employed
being preferably placed over the fire grate so that the gases pass around the
individual tubes of the group.
We have found that the combustion of the gases can he made more perfect
in this arrangement by forming a space or combustion chamber in this group and
this may be done in one way by employing an extra group or row of tubes in
front of each main group and between them and the fire such group being spaced
a little distance apart from the first and providing both groups with walls or
baffles to direct the course of the gases which may be first through the extra
group or row into the combustion chamber and then into the main group which
by the arrangement of the walls forms a flue, and then out to the chimney.
The walls may be formed if desired of shaped blocks of refractory material
inserted and held between the tubes.
D
10
1900
PHILIP M. JUSTICE,
Chartered Patent Agent, London,
For the Applicants.
Improvements in Water Tube Steam Generators.
We, HENRY JOHN CHARLES PATTISON and JOHN ALFRED PATTISON, both of the
Engineering Works, Granili, Naples, Italy, 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:-
Our invention relates to certain improvements on the type of boiler described
in the Specification of Letters Patent No. 14639 of 1898.
In this class of boiler a group or groups of "Field" or like tubes are arranged
beneath an upper collector or collectors such groups when two are employed being
LD017

page_text: preferably placed over the fire grate so that the gases pass around the individual
tubes of the group.
We have found that the combustion of the gases can be made more perfect
in this arrangement by forming a space or combustion chamber in this group
and this may be done in one way by employing an extra group or row of tubes
in front of each main group and between them and the fire such group being
spaced a little distance apart from the first and providing both groups with walls
or baffles to direct the course of the gases which may be first through the extra
group or row into the combustion chamber and then into the main group which
by the arrangement of the walls forms a flue and then out to the chimney.
The walls may be formed if desired of shaped blocks of refractory material
inserted and held between the tubes.
One manner of carrying out my invention or arranging the parts is shewn in
the accompanying drawing in which
Fig. 1 is a longitudinal section of a boiler its length being in the direction in
which it would be set in a vessel to which work this type of boiler is especially
adapted, and
s and
Fig. 2 is a sectional plan of the Field tubes on linear of Fig. 1.
The boiler in the form shewn consists of two cylindrical collectors a barranged
crosswise and partly fitting into one another, the lower reservoir being the
water chamber, and the upper one for its greater part a steam chamber.
From the lower collector depend two groups of Field or like tubes s
two groups or rows of similar tubes arranged somewhat apart from the first
groups such tubes forming the arch of the grate c. The space comprised between
the groups of tubes and s forms a second combustion chamber d, where the hot
gases coming from the first combustion chamber e are mixed, and complete their
combustion prior to their entering the groups through which they páss as in
a flue.
The walls, or diaphragms ƒ and g limit the first and the second combustion
chamber and together with the wall or diaphragm h, guide the hot gases, in the
direction indicated by the arrows, so as to bring them into contact with the
whole heating surface. These diaphragms may be made in various ways, but
that shewn is the one preferred, this consisting it will be seen in Fig. 2 of shaped
blocks of refractory material inserted between the tubes and held in place by
same except in the case of the blocks forming the diaphragm which are partly
shaped and may be held in place by any suitable means.
In the case of vessels subject to excessive rolling it may be sometimes of
advantage to provide means for preventing the water moving to and fro in
bulk in the collector b and to this end I may employ diaphragms in the latter
which will divide it up into spaces without however stopping the circulation
The arrangement of collectors and Field tubes in this type enables the tubes to
be kept constantly full of water even during the greatest rolling which ships are
subject to in case of marine boilers, the groups of tubes being so arranged that
each tube is visible all over its longitudinal extent from suitable doors 7 7 at
the ends and further it enables straight tubes to be employed which tubes may
freely expand and contract and be cleaned externally even during the working
of the boiler while the extra combustion chamber I provide is formed by an
outer row of tubes of a straight form which may freely expand and contract and
be removed at will so that said combustion chamber may be quickly exposed for
cleaning purposes.
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. In a water tube steam generator the combination with an upper collector,
of a group of water circulating tubes of the type having a closed end and an

page_text: internal diaphragm, a further group of like tubes separated from the first group
and walls between the two groups so that a combustion chamber is formed between
the two substantially as described.
2. In a water tule steam generator and in combination, an upper collector, a
group of water circulating tubes connected to same of the type having a closed
end and an internal diaphragm, a wall on either side of said group partly enclos-
ing same so as to form it into a flue a further group of like tubes connected to
the collector and spaced apart from the first group and a wall partly closing the
interstices of said group so that a combustion chamber is formed between the
first and second groups substantially as described.
3. The improved arrangement of water tubes in a steam generator substantially
as and for the purpose described and as illustrated.
Dated the 12th day of March 1900.
PHILIP M. JUSTICE,
55 & 56, Chancery Lane, W.C., Chartered Patent Agent,
For the Applicant.