KR20130061999A - Integrated device of treating ballast water for semi-rig - Google Patents

Integrated device of treating ballast water for semi-rig Download PDF

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Publication number
KR20130061999A
KR20130061999A KR1020110128368A KR20110128368A KR20130061999A KR 20130061999 A KR20130061999 A KR 20130061999A KR 1020110128368 A KR1020110128368 A KR 1020110128368A KR 20110128368 A KR20110128368 A KR 20110128368A KR 20130061999 A KR20130061999 A KR 20130061999A
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South Korea
Prior art keywords
ballast
active material
semi
ballast water
lead
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KR1020110128368A
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Korean (ko)
Inventor
홍성일
윤상찬
이신구
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대우조선해양 주식회사
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Priority to KR1020110128368A priority Critical patent/KR20130061999A/en
Publication of KR20130061999A publication Critical patent/KR20130061999A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63J—AUXILIARIES ON VESSELS
    • B63J4/00—Arrangements of installations for treating ballast water, waste water, sewage, sludge, or refuse, or for preventing environmental pollution not otherwise provided for
    • B63J4/002—Arrangements of installations for treating ballast water, waste water, sewage, sludge, or refuse, or for preventing environmental pollution not otherwise provided for for treating ballast water
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/008—Originating from marine vessels, ships and boats, e.g. bilge water or ballast water
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/001—Build in apparatus for autonomous on board water supply and wastewater treatment (e.g. for aircrafts, cruiseships, oil drilling platforms, railway trains, space stations)
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/04—Flow arrangements
    • C02F2301/046—Recirculation with an external loop
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/04—Disinfection

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Toxicology (AREA)
  • Health & Medical Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Water By Oxidation Or Reduction (AREA)

Abstract

Expensive large-scale ballast water treatment system and method developed for marine structures to protect marine environment and ecosystem against alien species and pathogens that are included in the number of ship ballasts that are used more than 10 billion tons per year and are spread to other ecosystems. The cost of installing the ballast water treatment system was reduced, and the weight of offshore structures, power consumption, and installation space were saved.

Description

Integrated device of treating ballast water for semi-rigs

The present invention relates to an integrated ballast water treatment device for a semi league that can easily process microorganisms that grow in ballast water used in a semi league.

If the ship is not loaded with enough cargo during operation, the propeller and rudder may not work effectively in the water and may work out of the water. Therefore, in order to maintain the equilibrium of the ship and to provide the optimum speed and efficiency, the seawater is filled in the ballast tank in the ship to maintain the proper draft.

At this time, the seawater filled in the ballast tank is called ballast water, and serves to maintain the balance and stability of the vessel.

The ballast water is placed on board before leaving the loading port and discharged offboard the ship before entering the loading port or loading the cargo. Therefore, the ballast water is continuously injected and discharged in the process of loading and discharging cargo on the ship, and the ballast water moves with the ship.

The ballast water is supplied by a pump or the like and stored in a closed compartment inside the ship. At this time, the ballast water contains various microorganisms such as plankton, bacteria and other aquatic organisms that live in the water supply area, and when the ballast water is discharged to coasts and harbors near the loading port, the ecosystem of the surrounding sea is disturbed. You will be tongued.

In addition, since the ballast water is kept closed and lightless for a long period of time, the amount of dissolved oxygen is lowered, and the discharge of the ballast water in the empty oxygen state adversely affects the living organisms in the surrounding sea area. .

In addition, if the ballast water is discharged to foreign ports, etc. and acts as a passage for 'unwanted harmful aquatic organisms', it not only destroys the indigenous marine ecosystem but also threatens the health by influx of pathogens and toxic organisms. It can also be quite expensive to process exotic species.

As the damage caused by ship ballast water spreads, the International Maritime Organization (IMO) recognizes this seriousness, adopts the International Convention on Ship Ballast Water and Sediment Management, and applies ballast water exchange standards from 2011. Mandatory to install Ballast Water Treatment equipment in offshore floating vessels such as Semi-Rig, and after 2017, all vessels satisfy the ballast water treatment standards established by IMO. Installation will be mandatory.

In general, there are three ways to reduce the influx of foreign marine species introduced through ballast water.

First, the ballast water is exchanged at sea before entering a specific port. This is a highly available method because it is possible to simplify the ballast system because it is possible only to have a seawater inflow and discharge configuration for exchanging ballast water.

However, since this method is carried out in the sea area of the exchange place far from the land, the coarse waves exist and the water pressure of seawater is higher than that of the land coast, which increases the longitudinal bending moment of the ship during the ballast water movement. . As a result, the hull deformation occurs, the hull posture anxiety in the ballast water exchange process, etc., the problem that it is difficult to secure the safety of the ship during the replacement process.

Second, ballast reception facilities and treatment facilities are installed and operated on the coast or on land. This is because the ship does not need to install a separate treatment device, the maintenance and risk of the ship is low in recent years.

However, the costs and complaints associated with the installation and operation of a large capacity facility may be incurred, and there is still a lack of useful devices, and research is being actively conducted.

Third, ballast water treatment facilities are installed on ships. This mandates the installation of such treatment facilities in the IMO Convention.

However, it is expensive to install the ballast water treatment device, and may cause loss of space, weight control, and power consumption for the treatment device.

On the other hand, ships equipped with various drilling equipments for drilling oil or gas existing in the basement of the seabed are rig ships or floating crude oil production storage and unloading facilities (for exclusive use of conventional seabed drilling). Floating Production Storage and Offloading (FPSO) and drillships that have been recently developed and used for offshore drilling.

Rig ships or FPSOs dedicated to subsea drilling can only be sailed by other tugboats, and mooring devices are used for subsea drilling, anchored at a point on the sea, and drillships have been recently developed and advanced drilling equipment. It is manufactured in the same form as a general ship so that it can be sailed by its own power.

By the way, the ballast water treatment methods as described above generate a lot of inefficient aspects to be applied to the semi-league that stays in a certain place for a long time, not a normal ship.

Therefore, the technology for the treatment of optimized ballast water in consideration of the operational characteristics of the semi-league ballast water while satisfying the IMO International Convention has been actively studied.

The present invention has been invented in view of the above circumstances, and by inventing an optimized ballast water treatment apparatus in consideration of the characteristics of ballast water operation of a semi-league, a separate device for treating ballast water is not required, The purpose of the device alone is to meet the criteria of the IMO Convention, to minimize installation space and power consumption, and to reduce costs.

According to an aspect of the present invention for achieving the above object, in the semi-lead ballast water treatment apparatus formed by installing a plurality of columns in the pontoons, drilling equipment is installed on the upper deck connecting the columns, the column 107 An upper column ballast tank 110 and a lower column ballast tank 120 respectively installed at upper and lower portions of the upper and lower columns; A pontoon ballast tank installed on the pontoon 108; And an active material storage container 150 for storing the active material capable of killing aquatic organisms contained in the ballast water. The active material storage container 150 includes the ballast tanks 110, 120, and 130. It is installed in one or more of the; provides an integrated ballast water treatment device for a semi-league.

The one or more ballast tanks (110, 120, 130) receives the seawater taken from the seawater inlet 101 through a ballast line 105 to use as ballast water, the active material stored in the active material storage container 150 An injection device (160) for injecting the ballast line (105); And further comprising:

The material of the ballast line 105 is characterized in that the reinforced glass fiber (reinfored glass fiber).

One or more ballast pumps 103 and 104 installed at the rear end of the seawater inlet 101 and supplying the seawater to the one or more ballast tanks 110, 120 and 130, further include the one or more ballast tanks. Injection into the ballast line 105 before being divided into 110, 120 and 130, or injecting the active material into the rear end of each of the one or more ballast pumps 103 and 104;

The injection device 160 is an duct or a pump;

The ballast water treatment apparatus is installed in a plurality of columns and pontoons formed in the semi-league (100); And a redundancy line 106 connecting the plurality of columns and ballast lines installed in the pontoons to each other.

The active material storage container 150 is a capacity to store the amount of use of the active material twice;

The manifold 170 for receiving the active material from the outside of the semi-lead 100 is installed in the active material storage container 150;

A pump 190 for supplying the active material loaded on the barge 200 to the active material storage container 150; A hose 180 for delivering the active material supplied by the pump 190; One end of the hose 180 is connected to the manifold 170, the other end is connected to the discharge port of the pump 190 to supply the active material to the active material storage container 150; do.

According to another aspect of the present invention, in the semi-lead ballast water treatment apparatus formed by installing a plurality of columns in the pontoons, and installing a drilling facility on the upper deck connecting the columns, the semi-lead ballast water treatment apparatus for storing and discharging ballast water A ballast line through which the ballast water flows through the active material by installing an active material storage container 150 for storing the active material capable of killing aquatic organisms in one or more ballast tanks 110, 120, and 130 installed in the rig. 105) to provide an integrated ballast water treatment device for a semi-lead, characterized in that.

The active material is injected into the ballast line 105 by using an duct or a pump.

According to the present invention, by inventing an optimized semi-lead dedicated ballast water treatment device in consideration of the characteristics of the ballast water operation of the semi-lead, there is no need for a separate device for treating the ballast water, or by using a small device. In order to meet the standards, it is possible to reduce the installation cost of the ballast water treatment system, minimize the installation space and power consumption, and prevent marine pollution.

In addition, new semi-leagues as well as existing semi-leagues can be treated with microorganisms in the ballast water with minimal design changes.

In addition, by installing the active material storage container inside the ballast tank installed in the hull (hull) of the semi-lead can increase the space utilization of the semi-lead upper deck.

1 is a view schematically showing the appearance of a semi-league according to the present invention.
Figure 2 is a side cross-sectional view schematically showing a semi-lead equipped with an integrated ballast water treatment device for a semi-lead according to the present invention.
Figure 3 is a side cross-sectional view schematically showing the supply of the active material using a barge to the active material storage container of the integrated ballast water treatment device for a semi-lead according to the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and operation of the preferred embodiment of the present invention. In the drawings, like reference numerals refer to like elements throughout. The same reference numerals in the drawings denote like elements throughout the drawings.

Since general ships move from port A to port B, the inflow and discharge of ballast water is always required, and at this time, the ballast water is used by inflowing seawater near the port where cargo is unloaded.

Substances included in these ballast waters include solids, mud, plankton-scale organisms, and micro-organisms, and ballast water treatment processes are key to sterilization of plankton and micro-microorganisms.

However, incorporation of large-scale living organisms and non-living organisms such as solids and muds greatly reduces the treatment efficiency of ballast water treatment. Therefore, in the ballast water treatment process in general ships, a filtration pretreatment system for removing large foreign substances such as the above, or hydrocyclone for removing aggregates, sediments, sludge, etc. from the ballast water, etc. Additional equipment will be needed.

Semi-lead (100, Floating Production Storage and Offloading) to which the present invention is applied, unlike a regular ship, there is no frequent movement from port A to port B and is fixed in the ocean for a long time, thus treating the ballast water like a normal ship. There is no need to use the equipment at all times.

In addition, the ballast number of the semi-league is free of large foreign matter such as solids and mud included in the ballast number of the general ship.

Therefore, it is not necessary to install all the various equipment for the ballast water treatment installed in a general ship, and devised the present invention in view of this point.

In general, there are two methods of treating ballast water in ships: physical treatment and chemical treatment.

Physical treatments include ultraviolet radiation, heating, ultrasonics, and chemical treatments such as chlorine, chlorine dioxide, ozone, hydrogen peroxide and many other organic chemicals.

Among the physical treatment methods, the ultraviolet irradiation method is inexpensive, and the device is simple, but the wavelength is short, the transmission power is weak, the variation and survival of the species may occur, and the efficiency may be reduced in the turbid water quality.

In addition, the heating method does not require the pretreatment, there is an advantage that can use the waste heat of the ship, but it is difficult to maintain a constant temperature, need continuous management during navigation, there is a concern of secondary pollution of the ocean by the discharge of hot water.

Therefore, in the present invention, a simple device for the treatment of ballast water is installed in a ballast tank installed inside the hull of the semi-league, and the chemical treatment method of the ballast water is applied to the device appropriately for the semi-lead. Solved them.

1 is a view schematically showing the appearance of a semi-league according to the present invention.

The semi-league 100 is formed by setting up a plurality of columns 107 in a pair of pontoons 108, placing an upper deck 109 on the columns 107, and then installing drilling facilities thereon. . The semi-league 100 ballasting or de-ballasting the ship's posture by ballasting the appropriate amount of seawater as a ballast water in a plurality of ballast tanks located in the pontoon 108 and the column 107. Keep it.

Figure 2 is a side cross-sectional view schematically showing a semi-lead equipped with an integrated ballast water treatment device for a semi-lead according to the present invention, Figure 3 is an active material storage container of the integrated ballast water treatment device for a semi-lead according to the present invention. Side cross-sectional view schematically showing supplying an active substance using a barge.

Ballast water treatment apparatus according to the present invention is a semi-lead ballast water treatment apparatus formed by installing a plurality of columns in the pontoons, drilling equipment on the upper deck connecting the columns, upper and lower column ballast tanks (110, 120) ), Pontoon ballast tank, and the active material storage container 150.

FIG. 2 is a diagram illustrating arrangement of various equipments, in which seawater flowing from the seawater inlet 101 is along the ballast line 105 by the ballast pumps 103 and 104, and the column ballast tanks 110 and 120. It is shown that the supply to the pontoon ballast tank (130).

Some of the seawater may be debalanced into the sea through the drainage line 146.

The upper column ballast tank 110 and the lower column ballast tank 120 are installed at the upper and lower portions of the column 107, respectively, and the pontoon ballast tank 130 is installed at the pontoon 108, in consideration of the margin of space. A plurality of ballasts may be installed, and ballasting or deballasting seawater using ballast water is performed to ballast the semi-league 100.

When ballasting or deballasting ballast water, the ballast line 105 is opened or closed using the seawater valves 111, 121, 131, 140, and 141, which can be remotely controlled, to allow the ballast water to flow into the ballast tank 110. , 120, 130 to be ballasted or deballasted.

Each ballast tank 110, 120, 130 is connected to a vent line 145 exposed to the atmosphere.

The active material storage container 150 stores the active material capable of killing aquatic organisms contained in the ballast water.

The active material storage container 150 stores the active material capable of killing the aquatic organisms contained in the ballast water, and the active material storage container 150 is intended for storing the active material, and thus uses a container or a tank. Shaped containers may be used.

Since the amount of active substance used is determined in proportion to the amount of ballast water, the capacity of the active substance storage container 150 is determined by the amount of active substance used for the amount of ballast recommended by the manufacturer of the active substance.

The active material storage container 150 is preferably designed to be able to store two times the amount used in consideration of the emergency without the need to store a large amount of the active material unnecessarily.

This is because the semi-lead 100 is fixed at one place for a considerable period of time unlike a general ship, and thus it is not necessary to always use the ballast water treatment device.

Active substances are common chemicals that can kill various microorganisms and shellfish in aquatic life contained in ballast water. Chlorinated fungicides, chlorine dioxide, acetic acid peroxide, ozone and peracrine (peraclean, manufactured by Degussa AG, Germany) Can be used.

The active material storage container 150 may be installed in the pontoon ballast tank 130, as shown in FIG. 2, and may be installed in each of the one or more ballast tanks 110, 120, and 130 as necessary. .

The ballast water treatment apparatus according to the present invention may further include an injection device (160).

One or more ballast tanks (110, 120, 130) receives the seawater taken from the seawater inlet 101 through the ballast line 105 to use as ballast water, the injection device 160 to the active material storage container 150 The stored active material is injected into the ballast line 105, and the injector 160 may use an duct or a pump.

If an duct is used as the injection device 160, no separate power source is required for the injection of the active material, but if a pump is used, a separate power source will be required.

The ballast pumps 103 and 104 are installed at the rear end of the seawater inlet 101 to supply seawater to one or more ballast tanks 110, 120, and 130. In the case of using the duct as the injection device 160, In order to allow the active material to be sucked into the ballast line 105, a pressure supply for the ballast water flows to the ballast line 105 by the ballast pumps 103 and 104.

Accordingly, the portion of the ballast line 105 into which the active material is injected so that the active material is smoothly sucked into the ballast line 105 by the duct, as shown in FIG. 2, of the ballast pumps 103 and 104. It may be a rear end or a point where the lines where the ballast pumps 103 and 104 are installed are joined.

If the pump is used as the injection device 160, the injection site may be anywhere, but injected into the ballast line 105 before being divided into one or more ballast tanks (110, 120, 130), or shown in FIG. As noted, it is desirable to inject the active material into the rear end of each of the one or more ballast pumps 103 and 104.

If it is injected after branching into each ballast tank, it is inefficient because the pipe for the injection of the active material is increased by that much.

The material of the ballast line 105 may be a general steel pipe, but corrosion may occur due to the number of ballasts, and thus, corrosion may be prevented by using a reinforced glass fiber material.

The active material can be injected into the line (e.g., drainage line 146) used when the ballast water is discharged from each ballast tank 110, 120, 130 to the outside, but chemical treatment is applied to the drained ballast water. If it is discharged to the outside, the secondary pollution of the ocean may be caused by the ballast water discharged by chemical treatment.

In addition, a redundancy line 106 may be added to connect the plurality of columns and the ballast lines 105 installed in the pontoons to each other, and the seawater inlet or the ballast pump formed in any one column or the pontoons by the redundancy line 106. When this is inoperable, the ballast water can be supplied to the ballast tanks 110, 120, 130 by replacing seawater inlets or ballast pumps that are inoperative by using seawater inlets or ballast pumps installed in other normal columns and pontoons. Will be.

 The redundancy line 106 is preferably installed downstream of the seawater inlet and ballast pump so that other seawater inlets and ballast pumps can be used even if the seawater inlet and ballast pump are inoperable.

In the active material storage container 150, as shown in Figure 3, by installing a manifold 170 to receive the active material from the outside of the semi-league 100, while reducing the supply time of the active material, to enable a stable supply can do.

The active material can be supplied through the barge 200, the barge 200 and the manifold 170 is connected between the hose 180, the pump 190 to operate the active material easily from the barge 200 The active material storage container 150 may be supplied.

Hereinafter, the operation of the semi-lead integrated ballast water treatment apparatus according to the present invention.

The semi-lead 100 is fixed at one place for a considerable period of time and does not always use the ballast water treatment device.

Therefore, in case of emergency or when supplying ballast water to the hull, the injection device 160 is operated to supply the active material in the active material storage container 150 to the ballast line 105 to kill aquatic organisms contained in the ballast water. Let's do it.

The active material may be loaded on the semi-league 100 in advance to the sea, or may be supplied by using a barge.

When the active material is supplied using the barge, the manifold 170 is installed in the active material storage container 150, and the barge 200 and the manifold 170 are connected to each other by a hose 180, and a pump ( 190) can be supplied to the active material can be supplied safely while reducing the supply time of the active material.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention will be.

100: semi-league 101: seawater inlet
102: three-way valve 103, 104: ballast pump
105: ballast line 106: redundancy line
107: column 108: pontoons
109: upper deck 110: upper column ballast tank
120: lower column ballast tank 130: pontoon ballast tank
111, 121, 131, 140: Seawater valve 145: Aeration line
146: drain line 150: active material reservoir
160: injection device 170: manifold
180: hose 190: pump
200: barge

Claims (11)

In the semi-lead ballast water treatment device formed by installing a plurality of columns in the pontoon, drilling equipment is installed on the upper deck connecting the columns,
An upper column ballast tank (110) and a lower column ballast tank (120) installed at upper and lower portions of the column (107), respectively;
A pontoon ballast tank installed on the pontoon 108; And
Including an active material storage container for storing the active material that can kill the aquatic organisms contained in the ballast water;
The active material storage container 150 is installed in one or more of the ballast tank (110, 120, 130);
Integral ballast water treatment device for a semi-lead. The method according to claim 1,
The one or more ballast tanks (110, 120, 130) receives the seawater taken from the seawater inlet 101 through the ballast line 105 to use as ballast water,
An injection device (160) for injecting the active material stored in the active material storage container (150) into the ballast line (105);
Semi-lead integrated ballast water treatment apparatus further comprising a. The method according to claim 2,
The ballast line 105 is made of a reinforced glass fiber;
Integral ballast water treatment device for a semi-lead. The method according to claim 2,
At least one ballast pump (103, 104) installed at the rear end of the sea water inlet 101 to supply the seawater to the at least one ballast tank (110, 120, 130);
Injecting the active material into a ballast line (105) before being divided into the one or more ballast tanks (110, 120, 130) or after each of the one or more ballast pumps (103, 104);
Integral ballast water treatment device for a semi-lead. The method of claim 4,
The injection device 160 is an duct or a pump;
Integral ballast water treatment device for a semi-lead. The method according to claim 5,
The ballast water treatment apparatus is installed in a plurality of columns and pontoons formed in the semi-league (100);
A redundancy line 106 connecting the plurality of columns and ballast lines installed in the pontoons to each other;
Integral ballast water treatment device for a semi-lead further comprising. The method according to claim 1,
The active material storage container 150 is a capacity to store the amount of the active material used twice;
Integral ballast water treatment device for a semi-lead. The method of claim 7,
The manifold 170 for receiving the active material from the outside of the semi-lead 100 is installed in the active material storage container 150;
Integral ballast water treatment device for a semi-lead. The method according to claim 8,
A pump 190 for supplying the active material loaded on the barge 200 to the active material storage container 150;
A hose 180 for delivering the active material supplied by the pump 190;
One end of the hose 180 is connected to the manifold 170, the other end is connected to the discharge port of the pump 190 to supply the active material to the active material storage container 150;
Integral ballast water treatment device for a semi-lead. In the semi-lead ballast water treatment device formed by installing a plurality of columns in the pontoon, drilling equipment is installed on the upper deck connecting the columns,
By installing an active material storage container 150 for storing the active material that can kill aquatic organisms in one or more ballast tanks (110, 120, 130) installed in the semi-lead to store and discharge the ballast water Injecting an active substance into the ballast line (105) through which the ballast water flows;
Integral ballast water treatment device for a semi-lead. The method of claim 10,
Injecting the active material into the ballast line (105) using an duct or a pump;
Integral ballast water treatment device for a semi-lead.
KR1020110128368A 2011-12-02 2011-12-02 Integrated device of treating ballast water for semi-rig KR20130061999A (en)

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Application Number Priority Date Filing Date Title
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150109727A (en) * 2014-03-20 2015-10-02 삼성중공업 주식회사 Ballast system for semi-submersible marine structure
KR20160032902A (en) * 2014-09-17 2016-03-25 대우조선해양 주식회사 Substructure And Support Method For Semi-Rig

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150109727A (en) * 2014-03-20 2015-10-02 삼성중공업 주식회사 Ballast system for semi-submersible marine structure
KR20160032902A (en) * 2014-09-17 2016-03-25 대우조선해양 주식회사 Substructure And Support Method For Semi-Rig

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