US3366982A

US3366982A - Offshore floating terminal

Info

Publication number: US3366982A
Application number: US448958A
Authority: US
Inventors: Charles D Sutton
Original assignee: IMODCO INTERNATIONAL Ltd
Current assignee: IMODCO INTERNATIONAL Ltd
Priority date: 1965-04-19
Filing date: 1965-04-19
Publication date: 1968-02-06
Anticipated expiration: 1985-02-06
Also published as: GB1096080A

Description

Feb. 6, 1968 c. D. SUTTON Y 3,366,982

OFFSHORE FLOATING TERMINAL Filed April 19, 1965 /N VEN TOR CHA/55 D. 5 NTO/V B Vla/wall M /ffw United States Patent Office 3,355,932 Patented Feb. 6, 1968 3,366,982 FFSHGRE FLATING TERMINAL Charles D. Sutton, Los Angeles, Calif., assiguor to Imodco International Limited, Nassau, Bahamas, a corporation of the Bahamas Filed Apr. 19, 1965, Ser. No. 448,958 Claims. (Cl. 9 8) rThis invention relates to an offshore terminal and more particularly to improvements in an offshore floating terminal.

In U.S. Patent No. 3,082,440, issued on Mar. 26, 1963, entitled Buoys for Ship Loading, Unloading or Bunkering, a novel buoy which serves as an offshore ship loading terminal is disclosed. Basically, the buoy is a floating structure which is anchored to the bottom of the sea by several anchoring chains so that it does not rotate despite forces of nature such as winds, waves, or sea currents. The buoy houses a non-rotatable internal multichamber unit, each chamber being connected by an undersea hose to a depot for storing liquids on the shore. Each of the chambers of the internal unit is in communication with a chamber in an external unit which is rotatably mounted on the internal unit. The external unit includes mooring means to enable a ship to be moored thereto. Flexible hoses connect the chambers of the external unit to the ship. Liquids may be pumped from the ship to the depot and/or from the depot to the ship flowing through the undersea hose and the buoy and the hoses coupling the buoy to the ship. The simultaneous but separate flow of a multiplicity of products in either parallel flow or counter flow mode is obtainable despite the fact that the ship is constantly moving around the buoy under the influence of wind, waves, and tides.

Such a floating offshore loading terminal has been found to be very advantageous since it enables the loading or emptying of ships without having to dock the ships at a conventional harbor. This is particularly advantageous since the draft and sizes of ships, such as tankers, is so large that they usually cannot be accommodated at all but a few docks. The buoy described in Patent No. 3,082,440 enables tankers to be rapidly loaded or unloaded without requiring conventional docking facilities. However, the construction, installation and maintenance of such buoys is quite high; therefore it must be operated as efciently as possible in order to financially justify its use. This can be accomplished by increasing its capacity of transferring products from the depot to the mooring ship, as well as increasing the number of ships which the terminal can serve simultaneously.

Accordingly, it is an object of the invention to provide a new offshore loading terminal.

Another object of the invention is to provide a novel offshore floating terminal which is operable at high efficiency to justify its cost.

Yet another object is the provision of an offshore floating loading terminal which can be used to transfer simultaneously fluid products or fluidized solids to or from more than one ship.

These and other objects of the invention are achieved by an offshore loading terminal in which the internal nonrotating multichamber unit is mounted in a platform which is anchored to the sea floor by a plurality of anchoring chains, so that the platform does not rotate despite the forces of nature. A portion of the internal unit containing the chambers extends through the top of the platform above the water level. The external unit is rot-atably mounted on the internal unit on top of the platform so that fluids and/or lfluidized solids flow from an onshore depot coupled to the chambers of the internal unit by means of undersea hoses to the external unit, and therefrom to moored ships.

The non-rotating platform is surrounded by a barge which is rotatable about the platform. A floating pier forms an integral part of the barge so that when the barge is subjected to forces causing it to rotate about the anchored platform, the pier rotates therewith. The pier is long and wide enough to enable more than one ship to be moored thereto, so that the terminal can be used t0 simultaneously serve more than one ship. Thus, the elllciency at which the terminal is operated is greatly increased.

The novel features that are considered characteristic of this invention are set forth with particularity in the appended claims. The invention itself both as to its organization and method of operation, as well as additional objects and advantages thereof, will best be understood from the following description when read in connection with the accompanying drawings, in which:

FIGURE 1 is a plan view of an offshore floating loading terminal of the present invention; and

FIGURE 2 is a cross-sectional view along lines 2 2 of FIGURE 1.

Referring to FIGURE 1, there is s-hown a new offshore floating loading terminal 10 which comprises a barge structure 12 floating on the surface of a body of water or sea 13. The barge structure 12 includes a floating pier 12a. In a tube-like opening 14 within the barge 12, is mounted a platform 16 which is anchored to the bottom of the sea 13 by a plurality of mooring chains 18. The chains 1S prevent the platform 16 from rotating or drifting under the forces of nature such as winds, waves or currents. However, the barge 12 is rotatably coupled to the platform so that the barge and the pier 12a are free to rotate about the center of the platform. The barge and pier include mooring hooks, bollards or bitts 21 used to tie up or

moor tankers

25 and 26 to the pier by means of mooring cables 27. The pier 12a is suitably fendered by guards 28 to prevent damage to the ships coming alongside it and to the pier itself.

Referring to FIGURE 2 which is a cross-sectional view along lines 2 2 of FIGURE l, there is shown an internal multichamber unit 31 mounted on top of the platform 16. Chambers 31a and 31h of unit 31 are connected by means of

pipes

33 and 34 and

flexible hoses

35 and 36 to

submarine pipes

37 and 38 respectively.

Pipes

37 and 38 are directly connected to an onshore depot 40 comprising fluid tanks 40a, so that fluids, such as lubricants, fuel or water, and certain solids, such as grains, crushed or pulverized products, may be directly supplied to and/or from the tanks and/ or to the various chambers of the internal unit 31. For explanatory purposes only, hereafter the invention will be described in conjunction with fluids which are transferred from the depot to the tankers. The term fluids is assumed to include various liquids, iluidized products, grain, gases, and any matter which can be transferred through pipes and hoses. It is appreciated that several different fluids may flow in parallel from shore to tanker or from the tankers to the shore. Also, different fluids may simultaneously flow in opposite directions, so that while certain fluids are transferred to the depot, other fluids are loaded aboard ship.

As seen from FIGURES 1 and 2, an outer unit 41 is rotatably mounted on unit 31, by means of thrust bearings 42.

Pipes

45 and 46 are connected to the unit 41 so that any fluids from the tanks fitia in the chambers 31a and 31b may flow through

pipes

45 and 45 respectively to or from either or both tankers. The

pipes

45 and 46 are rigidly clamped to the pier 12a by means of clamp 47 so that the barge 12, pier 12a,

pipes

45 and 46 and unit 41 form a single relatively rigid structure. Hereafter, this structure will be referred to as the outer structure, or outer means.

Reference is again made to FIGURE 2. As seen, the non-rotating platform 16 which is anchored to the bottom of the sea 13 by chains 13 is positioned within the tubelike opening 14 in barge 12. Thrust bearings 51 support the platform 16 on the barge 12, while radial bearings 52 are placed in the tube-like opening 14 between the platform and the barge so that the barge and any tankers moored to its pier 12a can freely rotate about the platform 16. Oil and water seal ring 53, and water seal 54 protect the spacing between the platform 16 and the barge and the various bearings from exposure to corroding water or other undesired elements.

The pipes 45y and 46 may extend the length of pier 12a so that only very short coupling hoses 55 (FIGURE 1) are necessary to connect the pipes to the holds of the tankers. Although in the foregoing description unit 31 is shown comprising of only two chambers 31a and 31h, it is appreciated that it may comprise of more than two. Each chamber would be connected to depot 40 by a pipe, such as pipe 33, flexible hose, such as hose 35, and a submarine pipe such as pipe 37. Unit 41 would then include additional pipes, such as pipe 45, to be in communication with such a chamber so that several different fluids could simultaneously flow from the depot to pipes on the pier 12a and therefrom to the several tankers moored thereto. In FIGURE l,

pipes

56 and 57 are included to represent such additional capabilities.

From the foregoing, it is appreciated that in the novel floating loading terminal of the invention, different fluids can be caused to flow from depot 4f) to chambers 31a and 31b (FIGURE 2) through

pipes

37 and 38,

hoses

35 and 36 and

pipes

33 and 34. If the sea is calm, the pier-like barge 12, the tankers and unit 41 will remain relatively stationary so that the liquids from chambers 31a and 31b will flow into

pipes

45 and 46 to be supplied by means of hoses 55 to the tankers. Under relatively rough sea conditions, the barge and tankers will no longer be stationary. Rather, forces such as waves or Winds will cause them to rotate as a single unit about the anchored platform 16. However, since the unit 41 and

pipes

45 and 46 form a part of the rigid structure which includes the barge and tankers, the ow of fluids from chambers 31a and 31b will continue uninterruptedly into the rotating

pipes

45 and 46.

The use of a relatively long pier greatly increases the efliciency at which the terminal can be operated, since several ships can be moored to the pier to be simultaneously loaded with fluids. Also the use of a pier to which tankers can be tied up enables the use of long pipes, such as

pipes

45, 46, 56, and 57, so that the tankers can be coupled to the terminal by very short hoses 55. This is particularly desirable since long flexible hoses which may float or are supported to float in the water are expensive. Also they tend to deteriorate in water so that they need be replaced occasionally.

There has accordingly been shown and described a novel offshore floating loading terminal which is particularly useful for simultaneously loading fluids from an onshore depot to more than one tanker moored offshore. The loading of fluids or any product which can flow through pipes and hoses can continue uninterruptedly despite rough sea conditions. Although the novel terminal of the invention has been described in conjunction with loading fluids from shore to tanker, it is apparent that the terminal can similarly be used to transfer fluids from the tankers to the depot on shore, as well as, simultaneouslyy transfer different fluids in both directions. It is appreciated that modifications may be made in the specic arrangements as shown Without departing from the spirit of the invention. Therefore, all such modifications are deemed to fall within the scope of the invention as claimed.

What is claimed is:

1. An offshore floating terminal for transferring fluids between a source of fluids and one or more tankers moored thereto offshore comprising:

a floating platform including a multichamber structure;

means for anchoring said platform to the bottom of a p body of water off shore for preventing said platform from rotating;

means for transferring fluids between each of said chambers and said source of liquids;

a pier-like barge rotatably mounted about said platform said barge being dimensioned and including means for mooring tankers on either side thereof;

an outer structure rotatably mounted on said platform about said multichamber structure, said outer structure having openings in communication with said chambers; and

means having ends connectable to said tankers and other ends connected to said openings of said outer structure for transferring fluids between said tankers and said chambers.

2. In combination with an offshore floating terminal, said terminal including an anchored non-rotatable multichamber structure, an outer structure rotatably mounted thereon, a plurality of fluid containing means coupled to said outer structure for transferring fluids between said fluid containing means and each chamber of said multichamber structure, and means for transferring fluids between said chambers and an onshore fluid depot, an elongated pier-like barge rotatably mounted about said anchored non-rotatable multichamber structure, said barge including means for mooring a tanker on either side thereof and flexible hoses for connecting said fluid containing means to a tanker moored to said pier-like barge for transferring fluids between said tanker and said fluid containing means.

3. In combination with an offshore floating terminal of the type wherein fluids from an onshore fluid depot are transferrable to `chambers of a non-rotating structure anchored to the bottom of a body of water, said structure being incommunication with an outer structure rotatably mounted thereon, said outer structure having means coupled thereto for transferring the fluids from said chambers to a tanker moorable to said outer structure, a floating elongated pier-like barge rotatably mounted about said anchored non-rotating structure;

a plurality of pipes rigidly mounted along said pierlike barge, each pipe having one end thereof coupled to said rotatable outer structure for receiving fluid from another of said chambers;

means for mooring tankers on either side of said pierlike barge; and

short flexible hoses for coupling the other ends of said plurality of pipes on said barge to said tankers for transferring fluids from said chambers to said tankers.

4. The combination as recited in claim 3 wherein said pier-like barge is rotatably mounted around said anchored non-rotating structure about one end thereof.

5. An offshore floating terminal as recited in claim 3 wherein said pier-like barge of said outer structure is disposed along one direction with respect to said floating structure, whereby said pier-like barge and the tankers moored thereto are rotatable 360 about said floating structure, said floating structure being a pivotal point of rotation therefor.

References Cited UNITED STATES PATENTS 2,894,268 7/ 1959 Griebe 9-8 3,086,367 4/1963 Foster 9-8 X 3,120,106 2/1964 Foster 9-8 X 3,155,069 11/1964 Ross et al. 9-8 X MILTON BUCHLER, Primary Examiner,

T. MAJ OR, Assistant Examiner.

Claims

1. AN OFFSHORE FLOATING TERMINAL FOR TRANSFERRING FLUIDS BETWEEN A SOURCE OF FLUIDS AND ONE OR MORE TANKERS MOORED THERETO OFFSHORE COMPRISING: A FLOATING PLATFORM INCLUDING A MULTICHAMBER STRUCTURE; MEANS FOR ANCHORING SAID PLATFORM TO THE BOTTOM OF A BODY OF WATER OFF SHORE FOR PREVENTING SAID PLATFORM FROM ROTATING; MEANS FOR TRANSFERRING FLUIDS BETWEEN EACH OF SAID CHAMBERS AND SAID SOURCE OF LIQUIDS; A PIER-LIKE BARGE ROTATABLY MOUNTED ABOUT SAID PLATFORM SAID BARGE BEING DIMENSIONED AND INCLUDING MEANS FOR MOORING TANKERS ON EITHER SIDE THEREOF;