KR101767549B1 - FLNG and Ballast Water Control Method for FLNG - Google Patents

FLNG and Ballast Water Control Method for FLNG Download PDF

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Publication number
KR101767549B1
KR101767549B1 KR1020150060374A KR20150060374A KR101767549B1 KR 101767549 B1 KR101767549 B1 KR 101767549B1 KR 1020150060374 A KR1020150060374 A KR 1020150060374A KR 20150060374 A KR20150060374 A KR 20150060374A KR 101767549 B1 KR101767549 B1 KR 101767549B1
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South Korea
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storage tank
natural gas
ballast
liquefied natural
tank
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KR1020150060374A
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Korean (ko)
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KR20160128659A (en
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배재류
추교식
김재휘
이성재
김성수
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대우조선해양 주식회사
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B43/00—Improving safety of vessels, e.g. damage control, not otherwise provided for
    • B63B43/02—Improving safety of vessels, e.g. damage control, not otherwise provided for reducing risk of capsizing or sinking
    • B63B43/04—Improving safety of vessels, e.g. damage control, not otherwise provided for reducing risk of capsizing or sinking by improving stability
    • B63B43/06—Improving safety of vessels, e.g. damage control, not otherwise provided for reducing risk of capsizing or sinking by improving stability using ballast tanks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B13/00—Conduits for emptying or ballasting; Self-bailing equipment; Scuppers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B39/00—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude
    • B63B39/02—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by displacement of masses
    • B63B39/03—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by displacement of masses by transferring liquids

Abstract

Disclosed is a FLNG ballast water control method including a plurality of membrane-type storage tanks, a free-standing storage tank installed at a forward portion or a stern portion, and a ballast tank installed at the opposite side of the independent storage tank.
The FLNG ballast water control method comprises the steps of 1) injecting ballast water into the ballast tank while delivering liquefied natural gas from the natural gas liquefaction plant to the independent storage tank, 2) (Hereinafter referred to as "opposite side storage tank") located at the opposite side of the storage tank, and while the liquefied natural gas is fed until 30% of the opposite side storage tank is filled, the liquefied natural gas Discharging the ballast water from the ballast tank when the amount of liquefied natural gas in the independent storage tank is reduced, and 3) discharging the ballast water from the independent storage tank to the central membrane- Tank (hereinafter referred to as a "central storage tank"), and 30% of the central storage tank is filled Maintaining the amount of ballast water in the ballast tank during the delivery of the liquefied natural gas until 4; and 4) transferring liquefied natural gas from the independent storage tank to the opposite storage tank until 70% During delivery, the ballast water is injected into the ballast tanks as the amount of liquefied natural gas in the independent tanks increases, and the ballast water is discharged from the ballast tanks as the amount of liquefied natural gas in the independent storage tanks decreases .

Description

FLNG and FLNG Ballast Water Control Method {FLNG and Ballast Water Control Method for FLNG}

The present invention relates to a method of controlling ballast water of FLNG and FLNG, and more particularly to a method of controlling ballast water of FLNG and FLNG, including independent liquefied natural gas storage tanks, membrane liquefied natural gas storage tanks and ballast tanks. will be.

Natural gas is transported in the form of gas through land or sea gas pipelines or liquefied in the form of liquefied natural gas (LNG) or liquefied petroleum gas (LPG), then stored in LNG transport or LPG transport Lt; / RTI >

Liquefied natural gas is obtained by cooling natural gas at cryogenic temperatures (approximately -163 ° C) and is well suited for long-distance transport through the sea, as its volume is reduced to approximately 1/600 of its gas equivalent.

Recently, there is a growing demand for marine floating structures that drill and store liquefied natural gas in deep waters such as FLNG (floating liquid natural gas plant) and LNG FSRU (floating storage and regasification unit). LNG Liquefied natural gas storage tanks installed in transport or LNG RVs.

FLNG, also known as LNG FPSO (Liquefied Natural Gas Floating Production Storage Offloading), is a vessel capable of extracting gas from the deep sea, separating and storing liquefied natural gas, and loading and unloading LNG carriers. (Hull) for storing liquefied natural gas and a topside for producing and treating liquefied natural gas.

Meanwhile, the liquefied natural gas storage tanks can be classified into independent tanks and membrane tanks depending on whether the load of the cargo directly acts on the insulation. Membrane-type storage tanks are divided into GTT NO 96 type and Mark III type. Independent tank type storage tanks are divided into MOSS type and IHI-SPB type. GTT NO 96 and GTT Mark III were formerly called GT type and TGZ type. In 1995, the names of GT (GT) and Technigaz (TGZ) were changed to GTT (Gaztransport & Technigaz) 96 type, and the TGZ type is replaced with the GTT Mark III type.

The MOSS type storage tank is designed to double structure the hull and to maintain the independent aluminum spherical tank independent of the hull and to support it with a skirt structure. It has a relatively simple sphere type pressure structure with high safety, Especially, it has the advantage of being strong against sloshing of liquefied natural gas. In the spherical tank, the load of the liquefied natural gas is directly transferred to the hull. The load of the liquefied natural gas does not act directly on the heat insulating material of the storage tank, and the bottom of the hull supports the load of the tank and the liquefied natural gas. The disadvantage of the MOSS type storage tank is that the spherical tank is protruded to the upper part of the deck, making it difficult to efficiently utilize the space because the visibility of the sailor is narrow. The advantages and disadvantages of MOSS-type storage tanks are common to stand-alone storage tanks.

Membrane-type storage tank is a type that uses a structure formed of a thin metal film as a protection barrier. It is relatively inexpensive as compared with a MOSS-type storage tank and easy to use the space above the deck and the space inside the hull. Is advantageous in securing visibility of a navigator. Membrane-type storage tanks must have the strength to support the load of liquefied natural gas because the load of liquefied natural gas is transferred to the hull through the membrane and insulation. The disadvantage of membrane type storage tanks is that they are vulnerable to sloshing of liquefied natural gas compared to MOSS type storage tanks.

The present invention provides a method for controlling ballast water of FLNG and FLNG, in which a self-contained storage tank is provided at a forefront portion or a stern portion, a membrane-type storage tank is provided at the remaining portion, and a ballast tank is provided at the opposite side of the self- The purpose.

According to an aspect of the present invention, there is provided an FLNG including an upper structure in which a natural gas liquefaction facility is installed and a substructure for storing liquefied natural gas produced in the natural gas liquefaction facility, A free-standing storage tank installed at a forward portion or a stern portion of the ship; A plurality of membrane type storage tanks installed in the remaining portion of the substructure to which the independent type storage tanks are not installed; And a ballast tank installed on the opposite side of the independent type storage tank, wherein liquefied natural gas is sent from the independent type storage tank to the plurality of membrane type storage tanks, and ballast water in the ballast tanks is discharged from the independent storage tank And the FLNG is regulated according to a process of supplying liquefied natural gas to the plurality of membrane type storage tanks.

The independent storage tank may be installed below the natural gas liquefaction facility.

The plurality of membrane-type storage tanks may be filled with liquefied natural gas at 30% or less or 70% or more.

According to another aspect of the present invention, there is provided a ballast water control system for an FLNG including a plurality of membrane type storage tanks, a forked or a stand-alone storage tank, and a ballast tank installed on the opposite side of the independent storage tank The method comprises the steps of 1) injecting ballast water into the ballast tank while delivering liquefied natural gas from the natural gas liquefaction plant to the stand-alone storage tank, 2) injecting ballast water into the membrane located on the opposite side of the stand- Type storage tank (hereinafter, referred to as "opposite-side storage tank"), when the amount of liquefied natural gas in the independent storage tank is increased while the liquefied natural gas is fed until 30% of the opposite side storage tank is filled, A ballast water is injected into the ballast tank, and a liquefied cloth And 3) discharging ballast water from the ballast tank when the amount of gas is reduced, and 3) discharging the ballast water from the independent storage tank to a central membrane-type storage tank (hereinafter referred to as a "central storage tank" Maintaining the amount of ballast water in the ballast tanks while delivering liquefied natural gas until it is filled; 4) from the stand-alone storage tank to the opposite storage tank until 70% of the opposite storage tank is filled, The ballast water is injected into the ballast tank when the amount of liquefied natural gas in the independent storage tank is increased and the ballast water is discharged from the ballast tank when the amount of liquefied natural gas in the independent storage tank is reduced A method of controlling the ballast water of FLNG is provided.

In step 1), the ballast water supplied to the ballast tank while the liquefied natural gas is being sent from the natural gas liquefaction plant to the independent storage tank is supplied with the same weight per hour as the liquefied natural gas supplied to the independent storage tank Gt; < / RTI >

The FLNG ballast water control method comprises the steps of: 5) if the liquefied natural gas produced is such an amount that up to 70% of all the central storage tanks are filled up, the ballast water within the ballast tanks The number may further be maintained.

The FLNG ballast water control method is as follows: 5) when liquefied natural gas produced is insufficient to fill up all the central storage tanks to 70%, up to 70% of the central storage tanks are filled up to 70% Further comprising injecting ballast water in the ballast tank if the central storage tank is located at the stern side and injecting ballast water in the ballast tank if the central storage tank is filled up to 70% .

Said FLNG ballast water control method comprising the steps of: 6) discharging ballast water from said ballast tanks when said central storage tanks are located at the stern side, while filling said central storage tanks filled up to 70% And injecting the ballast water into the ballast tank when the center storage tank is located on the bow side.

The FLNG ballast water control method comprises: 7) injecting ballast water into the ballast tank when the central storage tanks filled up to 30% are located on the bow side while the liquefied natural gas is fed to the central storage tanks filled up to 30% And discharging the ballast water from the ballast tank when the central storage tanks filled up to 30% are located at the stern side.

According to the FLNG and FLNG ballast water control method of the present invention, since the membrane-type storage tank can be maintained relatively strong against sloshing, it is possible to compensate for the disadvantage that the membrane-type storage tank is vulnerable to sloshing.

Further, according to the FLNG and FLNG ballast water control method of the present invention, the ballast water is filled in the ballast tank installed on the opposite side of the independent storage tank while the liquefied natural gas is filled in the independent storage tank, so that the ballast of the ship can be effectively controlled .

1 is a side view schematically showing a FLNG according to a preferred embodiment of the present invention.
2 and 3 are schematic flow charts of a method for controlling ballast water of FLNG according to a preferred embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. FLNG and FLNG ballast water control methods can be applied to various applications in ships and onshore where liquefied natural gas storage tanks are installed. In addition, the following examples can be modified in various forms, and the scope of the present invention is not limited to the following examples.

1 is a side view schematically showing a FLNG according to a preferred embodiment of the present invention.

Referring to FIG. 1, the FLNG of the present embodiment includes a stand-alone storage tank 100 installed at a forward portion or a stern portion; A plurality of membrane type storage tanks (210, 220, 230) installed at the remaining portion where the independent type storage tank (100) is not installed; And a ballast tank (300) installed on the opposite side of the independent storage tank (100).

The independent storage tank 100 and the plurality of membrane type storage tanks 210, 220 and 230 of the present embodiment are installed along the longitudinal direction of the hull 10 of the FLNG to store liquefied natural gas therein do.

The ballast tank 300 of this embodiment is installed on the opposite side of the independent storage tank 100 of the FLNG's lower structure (Hull) 10 to store the ballast water.

1, the independent storage tank 100 is installed at the bow and the ballast tank 300 is installed at the stern. However, the independent storage tank 100 may be installed at the stern. When the independent type storage tank 100 is installed at the stern part, the ballast tank 300 is installed at the bow.

The liquefied natural gas is supplied to the independent storage tank 100 from the natural gas liquefaction facility 21 installed at the top side 20 of the FLNG so that the independent storage tank 100 is close to the natural gas liquefier 21 .

1 shows that the IHI-SPB type is installed in the independent type storage tank, it may be installed in the MOSS type.

2 and 3 are schematic flow charts of a method for controlling ballast water of FLNG according to a preferred embodiment of the present invention. The FLNG ballast water control method of the present embodiment is a method of controlling natural gas liquefied by the natural gas liquefaction facility 21 in accordance with the process of supplying natural gas to the independent type storage tank 100 and the membrane type storage tanks 210, 220, do.

Referring to FIGS. 2 and 3, the liquefied natural gas in the natural gas liquefaction facility is primarily sent to a stand-alone storage tank (S110). Independent storage tanks are relatively resistant to sloshing, so there is less risk of breakage by sloshing without finely controlling the amount of liquefied natural gas in the independent storage tanks. Thus, the method for controlling the amount of liquefied natural gas in the storage tank for FLNG of this embodiment sends liquefied natural gas from a stand-alone storage tank to a plurality of membrane-type storage tanks after first sending liquefied natural gas to a separate storage tank.

Liquefied natural gas sent from a natural gas liquefaction facility to a primary independent storage tank (S110) is a membrane-type storage tank that is installed on the opposite side of the secondary storage tank, that is, when a stand- Type storage tank, and when the independent type storage tank is installed in the stern part, it is sent to a membrane type storage tank installed at the forefront part (S120).

Liquefied natural gas sent to a stand-alone storage tank is sent to a membrane-type storage tank located on the opposite side of the stand-alone storage tank because the liquefied natural gas is primarily sent to a stand-alone storage tank, This is because the installed side sinks and the ballast control of the ship may become difficult. According to the method for controlling the amount of liquefied natural gas in the storage tank for FLNG of this embodiment, since liquefied natural gas, which is sent primarily to the independent storage tank, is secondarily sent to the membrane type storage tank provided on the opposite side of the independent storage tank, So that the ballast control of the ship can be efficiently performed in a balanced manner.

The liquefied natural gas sent to the membrane-type storage tank installed on the opposite side of the independent storage tank is filled up to only about 30% of the storage tank (S120). Membrane-type storage tanks have a disadvantage in that they are vulnerable to sloshing of liquefied natural gas caused by shaking of the ship. When the liquefied natural gas is filled in the storage tank by about 30% to 70%, the damage caused by sloshing is the most Big. Therefore, in order to minimize the time in which the liquefied natural gas is filled in the membrane-type storage tank by about 30% to 70%, it is preferred that only about 30% of the liquefied natural gas in the membrane type storage tank installed on the opposite side of the independent- .

If the membrane type storage tank installed on the opposite side of the independent type storage tank is filled with liquefied natural gas by about 30% (S120), the membrane type storage tank except for the membrane type storage tank installed on the opposite side of the independent type storage tank from the independent type storage tank The liquefied natural gas is sent to a plurality of membrane type storage tanks installed in the tank, that is, at the center of the ship (S130).

When transferring liquefied natural gas from a stand-alone storage tank to a membrane-type storage tank installed on the opposite side of the independent storage tank or to a plurality of membrane-type storage tanks installed at the center of the ship, the liquefied natural Gas is sent.

Although it is possible to send liquefied natural gas sequentially from a stand-alone storage tank to a plurality of membrane-type storage tanks installed at a central portion (i.e., when one of the membrane-type storage tanks is filled to approximately 30% It is preferable to simultaneously send liquefied natural gas to a plurality of membrane-type storage tanks installed at the central part in order to balance the weight of the ship. The liquefied natural gas is filled up to about 30% of the plurality of membrane type storage tanks installed at the central portion (S130).

(S130), the liquefied natural gas is sent from a stand-alone storage tank to a membrane-type storage tank located on the opposite side of the independent storage tank, and is located on the opposite side of the independent storage tank The membrane-type storage tank is filled up to about 70% (S140).

(S140), the liquefied natural gas produced in the natural gas liquefaction plant is filled up to 70% or more of all of the storage tanks located at the center of the ship, after filling the membrane type storage tank located on the opposite side of the independent storage tank to approximately 70% (S150).

If liquefied natural gas produced by a natural gas liquefaction plant is insufficient to fill all 70% of the storage tanks located at the center of the ship, liquefied natural gas is only sent to the storage tanks that can fill up to 70% The remaining storage tank is maintained at the amount filled up to about 30% without sending liquefied natural gas (S161).

The plurality of membrane-type storage tanks installed at the center portion may be filled with liquefied natural gas sequentially or simultaneously. In other words, if only liquefied natural gas is filled in the storage tanks that can fill 70% or more (or if there are three membrane-type storage tanks installed in the middle, if the amount of liquefied natural gas can fill more than 70% Of the membrane-type storage tanks at the same time, up to approximately 70% of the liquefied natural gas and the other approximately 30%). Liquefied natural gas is filled in approximately 70% sequentially from any one of the storage tanks.

Even when filling 70% or more of the liquefied natural gas into only some storage tanks of a plurality of membrane type storage tanks installed at the central portion, the storage tanks are maintained at about 30% in consideration of the balance of the ships, It is desirable that the storage tank filled up above is located symmetrically with respect to the center of the ship.

The storage tanks that can fill up to 70% are filled to about 70%, the remaining storage tanks are filled to about 30% (S161), the storage tanks filled up to 70% are filled (S171) Liquefied natural gas is sent to the storage tanks (S181).

If the liquefied natural gas produced by the natural gas liquefaction plant is sufficient to fill all 70% of the storage tanks located at the center of the ship (S150), the storage tanks located at the center of the ship are all filled up to approximately 70% S160), and all the storage tanks are continuously filled with liquefied natural gas produced (S170).

According to the FLNG and FLNG ballast water control method of the present invention, the membrane-type storage tank can minimize the time during which the liquefied natural gas, which is vulnerable to sloshing, is filled between approximately 30% and 70% Breakage due to sloshing can be prevented.

Meanwhile, while the independent storage tank is filled with liquefied natural gas (S110), ballast water is also injected into the ballast tank (S210). The ballast water is preferably supplied at such a rate that approximately the same weight per hour as the liquefied natural gas supplied to the independent storage tank can be injected.

The ballast water may be injected into the ballast tank (S221) while discharging the ballast water from the ballast tank (S223) while filling the opposite tank with the liquefied natural gas to about 30% (S120) The ballast water may be maintained (S222).

If the amount of liquefied natural gas supplied from the natural gas liquefaction plant to the independent storage tank is larger than the amount of liquefied natural gas supplied from the independent storage tank to the opposite storage tank ((1) in FIG. 2) Since the amount of liquefied natural gas inside is increased, ballast water is injected into the ballast tank to balance the ship (S221).

If the amount of liquefied natural gas supplied from the natural gas liquefaction plant to the independent storage tank is less than the amount of liquefied natural gas supplied from the independent storage tank to the opposite storage tank ((3) in FIG. 2) Since the amount of liquefied natural gas is reduced, the ballast water in the ballast tank is discharged to balance the ship (S223).

If the amount of liquefied natural gas supplied from the natural gas liquefaction plant to the stand-alone storage tank is approximately equal to the amount of liquefied natural gas supplied from the independent storage tank to the opposite storage tank ((2) in Figure 2) Since the amount of liquefied natural gas is kept substantially constant, the ballast water in the ballast tank is maintained (S222).

While the central storage tanks are all filled with liquefied natural gas up to approximately 30% (S130), the equilibrium of the ship is substantially maintained since liquefied natural gas is supplied to the storage tanks installed at the center of the ship. Therefore, while the central storage tanks are all filled with liquefied natural gas by about 30% (S130), the ballast water in the ballast tank is maintained (S230).

The amount of liquefied natural gas supplied from the natural gas liquefaction facility to the independent storage tank is increased as much as possible while the opposite side storage tank is filled up to 70% (1) in Fig. 2), the ballast water is injected into the ballast tank (S241), and the liquefied natural gas supplied from the natural gas liquefaction facility to the independent storage tank When the amount of gas is less than the amount of liquefied natural gas supplied from the independent storage tank to the opposite storage tank ((3) in FIG. 2), the ballast water in the ballast tank is discharged (S243) Is approximately equal to the amount of liquefied natural gas that is supplied to the independent storage tank from the independent storage tank 2 (2)), the ballast tank is maintained within the ballast water (S242).

As the liquefied natural gas produced can fill up all of the central storage tanks to 70% (S150), while filling up all of the central storage tanks to 70% (S160), as in the case of filling the central storage tanks to 30% ) Since the equilibrium of the ship is almost maintained, the ballast water in the ballast tank is maintained (S250).

If the liquefied natural gas produced is insufficient to fill all of the central storage tanks to 70% (S150), if some storage tanks in the central storage tanks are filled up to 70% and the remaining 30% Accordingly, the ballast water may be injected into the ballast tank (S261), and the ballast water may be discharged from the ballast tank (S262).

For example, when the storage tank filled up to 70% of the central storage tanks is located at the stern side, that is, as shown in Fig. 1, two central storage tanks are included, and the aft middle storage tanks 220 are filled with liquefied natural The amount of liquefied natural gas supplied from the natural gas liquefaction facility 21 to the independent storage tank 100 and the amount of liquefied natural gas supplied from the independent storage tank 100 to the aft middle storage tank 220 If the amount of liquefied natural gas is similar, the aft side becomes heavy, so that the ballast water in the ballast tank is discharged to maintain equilibrium of the ship (S262).

Conversely, when a storage tank filled up to 70% of the central storage tanks is located on the bow side, that is, as shown in FIG. 1, two central storage tanks are included, and a liquefied natural gas The amount of liquefied natural gas supplied from the natural gas liquefaction facility 21 to the independent storage tank 100 and the amount of liquefied natural gas supplied from the independent storage tank 100 to the aft side central storage tank 230 If the amount of liquefied natural gas is similar, the ballast water is injected into the ballast tank because the bow is heavy, thereby maintaining the equilibrium of the ship (S261).

As in the case of filling the storage tanks filled up to about 70% of the central storage tanks (S171), filling up some of the storage tanks in the central storage tanks to 70% and maintaining the remaining 30%, for example, In the case where the liquefied natural gas is filled in the reservoir tank 220, the ballast water in the ballast tank is discharged (S272), and when the liquefied natural gas is filled in the aft aft storage tank 230, (S271).

(S181), the ballast water may be injected into the ballast tank (S281) while the liquefied natural gas is being sent from the independent storage tank to the storage tanks filled up to approximately 30% of the central storage tanks The ballast water may be discharged (S281).

When the storage tank 220 is filled with liquefied natural gas, the storage tank filled up to approximately 30% is located on the bow side. Therefore, ballast water is injected into the ballast tank to balance the ship (S282) When the central storage tank 230 is filled with liquefied natural gas, the storage tank filled up to approximately 30% is located at the stern side, so that the ballast water is discharged from the ballast tank to balance the ship (S281).

According to the FLNG and FLNG ballast water control method of the present invention, the ballast water is filled in the ballast tank installed on the opposite side of the independent storage tank while the liquefied natural gas is filled in the independent storage tank, so that the ballast of the ship can be effectively controlled.

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. It is.

10: substructure 20: superstructure
21: Natural gas liquefaction facility 100: Stand-alone storage tank
210, 220, 230: Membrane-type storage tank 300: Ballast tank

Claims (10)

delete delete delete A ballast water control method for an FLNG comprising a plurality of membrane-type storage tanks, a free-standing storage tank installed at a forward portion or a stern portion, and a ballast tank provided at the opposite side of the independent storage tank,
1) injecting ballast water into the ballast tank while delivering liquefied natural gas from the natural gas liquefaction plant to the stand-alone storage tank,
2) While the liquefied natural gas is being sent from the independent storage tank to a membrane type storage tank (hereinafter referred to as "opposite storage tank") located on the opposite side of the independent storage tank until 30% of the opposite storage tank is filled , Ballast water is injected into the ballast tank when the amount of liquefied natural gas in the independent storage tank is increased and the ballast water is discharged from the ballast tank when the amount of liquefied natural gas in the independent storage tank is reduced,
3) While the liquefied natural gas is being fed from the independent storage tank to the central membrane type storage tank (hereinafter, referred to as a 'central storage tank') until 30% of the central storage tank is filled, the ballast water in the ballast tank Keeping the amount of water,
4) When the amount of liquefied natural gas in the independent storage tank is increased from the independent storage tank to the opposite storage tank while the liquefied natural gas is being fed until 70% of the opposite storage tank is filled, And discharging the ballast water from the ballast tank when the amount of liquefied natural gas in the independent storage tank is reduced. The method of claim 4,
In the step 1), the ballast water supplied to the ballast tank while the liquefied natural gas is being sent from the natural gas liquefaction facility to the independent storage tank,
Wherein the liquefied natural gas is supplied at a rate such that the same weight per hour as the liquefied natural gas supplied to the stand-alone storage tank can be injected. The method of claim 4,
5) The ballast water in the ballast tank is maintained while the liquefied natural gas produced is sufficient to fill up all of the central storage tanks to 70%, while filling up all of the central storage tanks to 70%. , FLNG ballast water control method. The method of claim 4,
5) If the liquefied natural gas produced is insufficient to fill all of the central storage tanks to 70%, while the central storage tanks are filled up to 70% of the central storage tanks, the central storage tanks filled up to 70% And discharging the ballast water in the ballast tank and injecting ballast water in the ballast tank if a central storage tank filled to 70% is located on the bow side. The method of claim 7,
6) When the central storage tanks filled up to 70% are filled, the ballast water in the ballast tanks is discharged when the filled central storage tanks are located on the stern side, and when the filled central storage tanks are located on the bow side, Further comprising the step of injecting ballast water into the ballast tank. The method of claim 8,
7) While sending the liquefied natural gas to the central storage tanks filled up to 30%, if the central storage tanks filled up to 30% are located on the bow side, the ballast water is injected into the ballast tanks and the central storage tanks filled up to 30% Further comprising the step of discharging ballast water from the ballast tank when it is located at the stern side. delete
KR1020150060374A 2015-04-29 2015-04-29 FLNG and Ballast Water Control Method for FLNG KR101767549B1 (en)

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