IMPROVEMENTS IN VESSELS FOR CARRYING SEWAGE OR OTHER LIQUID OR SEMILIQUID SUBSTANCES
Year: 1886

page_text: or gemi-uquia substances,
I, CHARLES BLAGBURN of 150, Leadenhall St. London E.C. Engineer do hereby
declare the nature of my invention for IMPROVEMENTS IN VESSELS FOR CARRYING
SEWAGE OR OTHER LIQUID OR SEMILIQUID SUBSTANCES to be as follows:-
:-
This invention consists principally in fitting an improved form of tank to hold
the sewage or other liquid substances, in the Vessel.
It has hitherto been the practise to fit in such Vessels tanks of square or other
section with flat sides; in my invention I make them of circular section. This
adds greatly to the strength of the tanks and to the facility of manufacture, and
also on account of their symmetrical shape, the centre of gravity of the Vessel
is very slightly displaced when rolling, thus adding greatly to the stability of the
Vessel:
One or more of the tanks are placed longitudinally in the Vessel.
When carrying sewage a valve is connected to the bottom for discharging
into the sea, down to the sea level, after which the residue is pumped out by a
centrifugal pump, or other suitable ineans.
When carrying oil in the main tanks above these may be placed smaller feed
tanks, these tanks are intended as a store to supply any waste in the main tanks
and keep them always full. They will also catch any vapour rising from the main
tank, through suitable pipes and valves.
Each of the tanks is divided by transverse partitions which may form part of
the structure of the Ship.

page_text: or Semi-liquid Substances.
I, CHARLES BLAGBURN of. 150 Leadenhall Street London E.C. Engineer do
hereby declare the nature of my invention for VESSELS FOR CARRYING SEWAGE OR
OTHER LIQUIDS 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 a vessel fitted with an improved form of tank to hold
Bewage or other liquid or semi-liquid substances.
It has hitherto been the practice to fit, in such vessels, tanks of square, or other
section with flat sides. In my invention I make the tanks of circular section. This
adds greatly to the strength of the tanks and to the facility of their manufacture
&, on account of their symetrical shape, the centre of gravity of the vessel is very
slightly displaced when rolling, thus adding greatly to the stability of the vessel.
One or more tanks of circular section are placed longitudinally in the vessel and
are fixed to the hull of the vessel by suitable connections, to prevent any movement,
or the tanks may be built into the bull of the vessel and form part of the structure.
Transverse partitions or bulkheads are fitted to the tanks, dividing them into
sections, these partitions may form part of the structure of the ship and may extend
right across the hull forming ordinary transverse bulkheads.
The tanks are fitted with proper batches and manholes which can be closed
air-tight, and may be fitted with proper pipes and valves connecting one tank with
another.
When carrying sewage suitable pipes are arranged so that the sewage is allowed
to run out by gravity till the level inside the tanks is the same as that of the sea,
after which the residue is pumped out by suitable means, such as a centrifugal or
other pump.
Proper non-return valves are fitted on the pipes to prevent the sea entering the
tanks, and suitable valves are fitted for regulating the discharge. Pipes are fitted
in the tanks for the purpose of flushing them & cleaning them out effectively; the
water for this purpose is supplied either by a pump or from the shore.
The pumps may be placed on deck or in any part of the boat, but I prefer to fit
them alongside or at the end of the tanks at as low a level as possible.
When the vessel is carrying petroleum or oil in the main tanks, I place above
them smaller feed tanks which are intended as a store to supply any waste in the
main tanks and keep them always full. They will also catch any vapour rising
from the main tanks through suitable pipes & valves.
In order that my invention may be properly understood, I hereunto append one
sheet of explanatory drawings to be hereinafter refered to, similar letters of
reference indicating similar parts in the various views:-
Fig. 1 represents a longitudinal section of a vessel, showing the longitudinal
tank for carrying the cargo and the transverse bulkheads.
Fig. 2 represents the plan of the same vessel.
Fig. 3 represents the section of the same vessel through the line A. B.

page_text: The pipes shown at D. D. are the discharge pipes for allowing the sewage to
run out by gravity. The pump P. is for pumping out the residue, through the
pipes R. R
Scouring pipes are shown at S. for flushing the tanks. H. H. are the manholes
or hatches.
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 combination with the hull of a vessel, a tank or tanks, of circular section,
fitted or built into the said hull, for conveying sewage, sludge, or other liquid or
semi-liquid substances.
2. In combination with the tank or tanks above mentioned, an arrangement of
pipes for discharging the cargo as hereinbefore described.