Improvements in the Construction of Steam and other Navigable Vessels for the Conveyance of Liquid Cargo in Bulk, such as Petroleum.
Year: 1886

page_text: Date of Application, 1st Apr., 1886.
Complete Left, 1st Jan., 1887.
Complete Accepted, 1st Feb., 1887.
PROVISIONAL SPECIFICATION.
Improvements in the Construction of Steam and other Navigable
Vessels for the Conveyance of Liquid Cargo in Bulk, such as
Petroleum.
I WILLIAM DOBSON of The Chesters, Jesmond in the City and County of Newcastle-
upon-Tyne Ship Builder do hereby declare the nature of my invention for IMPROVE-
MENTS IN THE CONSTRUCTION OF STEAM AND OTHER NAVIGABLE VESSELS For the
CONVEYANCE OF LIQUID CARGO IN BULK, SUCH AS PETROLEUM, to be as follows:-
My invention is applicable for the construction of new vessels for the conveyance
of Liquid Cargo in bulk so as to render them more sea worthy when laden but it may
also be applied to vessels already constructed.
The ship to which my invention is to be applied is to be as usual fitted with chambers
or tanks formed by longitudinal and thwartship bulkheads extending from the bottom
to the top of the tanks and made water and oil tight as usual.-The number and size
of the tanks will of course vary in accordance with special requirements and the
tanks may either extend to the outer shell of the ship or to an inner shell as may be
preferred.
In addition to this usual fitting I have just described 1 by my invention fit within
the chambers or tanks mentioned one or more horizontal division or divisions thereby
separating the lower part of the cargo from that above I connect the upper part of
the tanks so formed with the lower part of the tanks by pipes and valves so as that the
contents of the lower part of the tanks shall be continuously subjected to the pressure
due to the higher level of the liquid in the upper part of the tanks.
By this arrangement when the ship rolls or pitches if there should be in any tank
any space unfilled by the liquid cargo the wash of the cargo due to the motion of the
ship shall not involve movement of the whole contents of the tank but only of such
part of it as is above the horizontal division plate which by my invention is fitted in.
I place in communication with the tanks by means of pipes and valves domes or
receivers so as to provide for expansion and contraction of the liquid cargo and I fit
these domes or receivers with gauge glasses or other convenient appliances to shew
the height of the liquid in the tanks.

page_text: I also provide pipes, valves and pumping arrangements whereby any tank or com-
partment of a tank may be emptied into another in case of any accidental leakage.
I also provide that the extreme ends of the tanks or chambers for the cargo, shall be
protected by additional thwartship bulkheads spaced a few inches apart so arranged
as that this space between may be filled with water so as more effectually to prevent
any possibility of leakage.
I may also arrange connection to a reservoir at a higher level of this water jacket
so that there shall be a slight pressure of water tending to enter the cargo tank in
excess of the pressure tending to leakage of cargo.
And I provide pipes and valves whereby any gas which may be generated in the
tanks shall be conveyed away to a safe exit.
JAMESON & SCHAEFFER,
Agents for William Dobson.

page_text: COMPLETE SPECIFICATION.
Improvements in the Construction of Steam and other Navigable
Vessels for the Conveyance of Liquid Cargo in Bulk, such as
Petroleum.
I, WILLIAM DOBSON, of The Chesters, Jesmond, in the City and County of Newcastle-
on-Tyne Ship Builder, do hereby declare the nature of my invention for IMPROVк-
MENTS IN THE CONSTRUCTION OF STEAM AND OTHER NAVIGABLE VESSELS FOR THE
CONVEYANCE OF LIQUID CARGO IN BULK SUCH AS PETROLEUM, and in what manner
the same is to be performed, to be particularly described and ascertained in and by
the following statement :-
My Invention is applicable for the construction of new vessels for the conveyance
of Liquid Cargo in bulk so as to render them more sea worthy when laden but it may
also be applied to vessels already constructed..
The ship to which my Invention is to be applied is to be as usual fitted with chambers
or tanks formed by longitudinal and thwartship bulkheads extending from the bottom
to the top of the tanks and made water and oil tight as usual.-These bulkheads I have
marked in the drawing L and T respectively.-The number and size of the tanks will
of course vary in accordance with special requirements and the tanks may either extend
to the outer shell of the ship or to an inner shell as may be preferred.
In addition to the usual fitting I have just described, I by my invention fit within
the chambers or tanks mentioned one or more horizontal division or divisions thereby
separating the lower part of the cargo from that above, one of these divisions is marked
in the drawing H. I connect the upper part of the tanks so formed that is to say the
part above H with the lower part of the tanks, that is to say the part below H. by
pipes and valves marked P. V. so as that the contents of the lower part of the tanks
shall be continuously subjected to the pressure due to the higher level of the liquid in
the upper part of the tank.
By this arrangement when the ship rolls or pitches if there should be in any tank
any space unfilled by the liquid cargo, the wash of the cargo due to the motion of the
ship shall not involve movement of the whole contents of the tank but only of such
part of it as is above the horizontal division plate or plates which by my invention is
or are fitted in.
I place in communication with tanks by means of pipes and valves not shewn in the
drawing, domes or receivers marked R. so as to provide for expansion and contraction
of the liquid cargo and I fit these domes or receivers with guage glasses or other
convenient appliances to shew the height of the liquid in the tanks.
I also provide pipes, valves, and pumping arrangements whereby any tank or
compartment of a tank may be emptied into another in case of any accidental leakage.
I also provide that the extreme ends of the tanks or chambers for the cargo shall be
protected by additional thwartship bulkheads one of which is marked D, spaced a few

page_text: inches apart from the oil bulkhead so arranged as that the space between may be filled
with water so as more effectually to prevent any possibility of leakage. I may also
arrange connection to a reservoir W at a higher level than this water jacket so that
there shall be a slight pressure of water tending to enter the cargo tank in excess of
the pressure tending to leakage of cargo. And I provide pipes and valves whereby
any gas which may be generated in the tanks shall be conveyed away to a safe exit.
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 :-
1st. The construction of ships for the conveyance of liquid cargo with horizontal
division plates in the tanks and with pipes and valves as and for the purpose
substantially as described.
2nd. The construction of water filled compartments as bulkheads whereby tendency
may be given for leakage of water inwards to cargo, instead of leakage of oil outwards
to the bilges of the ship.
JAMESON & SCHAEFFER,
Agents for Wm. Dobson.
=