KR101005897B1 - Incline test method using BOP transporter - Google Patents

Incline test method using BOP transporter Download PDF

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KR101005897B1
KR101005897B1 KR1020080048513A KR20080048513A KR101005897B1 KR 101005897 B1 KR101005897 B1 KR 101005897B1 KR 1020080048513 A KR1020080048513 A KR 1020080048513A KR 20080048513 A KR20080048513 A KR 20080048513A KR 101005897 B1 KR101005897 B1 KR 101005897B1
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South Korea
Prior art keywords
bop
transporter
moving
ship
weight
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KR1020080048513A
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Korean (ko)
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KR20090122612A (en
Inventor
김경환
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대우조선해양 주식회사
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01CMEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C9/00Measuring inclination, e.g. by clinometers, by levels
    • G01C9/02Details
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63BSHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B35/00Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B63B35/44Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63BSHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B79/00Monitoring properties or operating parameters of vessels in operation
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M99/00Subject matter not provided for in other groups of this subclass

Abstract

The present invention relates to a warp test method of a ship using a BOP transporter, and more particularly to a warp test method for calculating the final weight and the center of gravity after completing the plotter-type offshore structure (for example, drilling ship).
According to the present invention, the step of causing the inclination using the BOP transporter 20 installed in the door pool area 15 in the center of the marine structure 10; Moving the test weight or the BOP itself on the BOP transporter 20 according to a predetermined movement path; And it provides a slope test method of the ship using a BOP transporter comprising the step of obtaining the vertical center value (VCG) after moving according to the predetermined movement path.
BOP, Transporter, Slope Moment, VGC

Description

Incline test method using BOP transporter

The present invention relates to a method of inclination test of a vessel using a BOP (Blow-Out Preventer, hereinafter: BOP) transporter. More specifically, the present invention relates to a tilt test method for calculating final weight and center of gravity after completing a floater type offshore structure (eg, a drilling line).

The inclination test to check the ship's center position is also called the center test. The center of gravity of the ship is important for safety and performance, so plan to make sure it is in the right place from the beginning. Therefore, it is necessary to calculate and examine the position numerically through the complicated process with drawing up the design.

The weight of materials and loads and the position of the center of gravity of the hull are calculated one by one and the final result is determined by combining them. Whether or not the calculated numerical values are indeed correct should be measured with a ship.

The test method moves a small weight on the deck only a certain distance in the direction of the ship's side and side, and then measures the angle of inclination of the ship by the amount of vibration of the long swing hanging on board. The timing of doing this is to find the center position of the hull weight just before / after completion of the ship.

On the other hand, the method of inducing the current inclination moment is to define the inclined by moving the weight block after the proven weight block on the hull deck, unless there is a special difficulty, the ship having a relatively large arm (GM) In the case of using ballast water (Ballast Water) may cause the inclination moment.

In addition, the semi-submersible type is inclined using a weight block because the GM is small, and the weight block placed on the upper deck is moved to the left and right ports using a crane on the deck. Moved.

In particular, during the inclination test forcibly moving the weight to cause a certain inclination, this conventional inclination was carried out by moving a number of specially shaped weight blocks (cubic block) of a special shape to a predetermined position on the deck.

The operation of the weight block is a long test time because the deck crane on the ship moves from port to starboard to starboard to port in total 8 times (one to several blocks at a time). There was a risk of collision with the ship's structure and the fall of the weight block.

Therefore, the following items should be prepared in order to perform the tilt test by the conventional method.

First, a large number of test weight blocks of small weight, taking into account crane and deck load, were needed.

Second, two cranes were required, as one crane could not cover the entire area, and an operator was also required.

Third, a number of workers were required for fastening, moving, and separating the weight block.

As described above, in the past, the position of placing a plurality of weight blocks had to be secured from the deck of the hull. Such a place should be a position where a large trim does not occur when the block moves, and the deck load is sufficient. There were several constraints that must be met.

The present invention is to solve the above problems, an object of the present invention is to provide a slope test method of a ship using a BOP transporter that can induce a tilt moment by using a BOP transporter installed in the door pool area of the center of the plotter-type offshore structure To provide.

According to the present invention as a technical idea for achieving the object of the present invention, the step of causing the inclination using the BOP transporter 20 installed in the door pool area 15 in the center of the marine structure (10); Moving the test weight or the BOP itself on the BOP transporter 20 according to a predetermined movement path; And it provides a slope test method of the ship using a BOP transporter comprising the step of obtaining the vertical center value (VCG) after moving according to the predetermined movement path.

As described above, according to the present invention, the test weight can be loaded up to a load that a BOP transporter relatively large than the deck load can withstand and there are almost no positional constraints.

In addition, according to the present invention, the BOP transporter by itself fastening the test weight or BOP, there is no risk of collision and falling of the main structure when moving, and even when the accident occurs in the lower part of the sea there is no risk of accident due to falling.

In addition, according to the present invention, it is not necessary to use a deck crane in order to move the weight block to the left and right port, and it is possible to operate with a minimum number of personnel since only the BOP transporter operator is required instead of two or more crane operators, signals, and operators.

In addition, according to the present invention, all of the weight block fastening / moving / separating work is not necessary, and only the BOP transporter needs to move the corresponding distance according to a predetermined procedure, and the test weight is relatively large compared to the weight block which is subject to a lot of place and weight constraints. Because it can be used to cause a large inclination moment has the advantage of very easy to incline the hull (hull).

In addition, according to the present invention, if only the weight of the BOP transporter is correctly verified, more accurate calculation results can be obtained than using a weight block placed on a deck, and test preparation period and test time can be reduced.

Hereinafter, with reference to the accompanying drawings, the configuration and operation of the embodiment of the present invention will be described in detail.

1 is a view showing the movable distance of the BOP transporter for the tilt test according to the present invention. 2 is a view showing in detail the movement path of the BOP transporter according to the present invention.

The inclination test method according to the present invention comprises the steps of causing the inclination using the BOP transporter 20 installed in the door pool area 15 in the center of the marine structure (10); Moving the test weight or the BOP itself on the BOP transporter 20 according to a predetermined movement path; And obtaining a vertical center value (VCG) after moving according to the predetermined movement path.

Referring to FIG. 1, a BOP transporter installed at one side of a door pool area 15 in the center of a floater-type offshore structure (eg, drilling rig) 10 may be described. (20) to induce a tilt moment, and the test weight (Test Weight) or the BOP itself is placed on the BOP transporter (20) after moving in a predetermined movement path in the vertical center (垂直 重心) value ( Vertical Center of Gravity (hereinafter referred to as VCG).

Here, the inclination test is composed of a weight (Deadweight) test to determine the light weight of the ship after the completion of the ship construction, and a slope test to check the center of gravity (particularly, VCG).

The inclination test method is forcibly inclined by moving the ship in equilibrium (Even Keel Condition) a total of eight times from side to side according to a predetermined movement path using a weight block or ballast water in which weight is checked. Moment (Heeling Moment) is generated to calculate the VCG using the hydrostatic characteristics of the ship and the equation.

At this time, the ship's VCG has a direct impact on stability, so it should be managed below the design value and verified through slope test.

The method of obtaining the VCG of the inclination test is to first induce a total of eight inclination moments to obtain GM using each inclination moment and pendulum deflection. do.

Here, the total of eight tilt moments move the BOP transporter 20 along the paths 1 and 2 from the reference point to the starboard direction as shown in FIG. 2, and the position of the starboard port. Move to the reference point along the paths (3) and (4) in the port direction at, and again move along the paths (5) and (6) from the reference point to the port direction, and from the position of the port to the starboard direction (7) It is caused by moving the reference point along (8). In this case, as shown in FIG. 2, the reference point is designated by selecting a center point of the movable distance that the BOP transporter 20 can move in the moon pool area 15.

Equation 1 for obtaining GM is as follows.

Figure 112008037170897-pat00001

The VCG is obtained by using Equation 2 below.

Figure 112008037170897-pat00002

Where KTM represents the hydrodynamic value.

Therefore, the present invention instead of moving the weight block (Weight Block) manufactured separately on the upper deck of the conventional method by a crane, the test weight (Test weight) using the BOP transporter 20 installed on the ship ) Or move the BOP.

In particular, there is a trust on the bottom of the ship, such as a drilling rig, and the test draft is deep, so it is very effective when the test needs to be performed outside the port.

As described above, although the inclination test method of the vessel using the BOP transporter as a preferred embodiment of the present invention has been described, the present invention is not limited to the specific preferred embodiment described above, of the present invention claimed in the claims Various modifications can be made by those skilled in the art without departing from the gist of the present invention, and such changes may be included within the technical scope of the claims.

1 is a view showing the movable distance of the BOP transporter for the tilt test according to the present invention.

2 is a view showing in detail the movement path of the BOP transporter according to the present invention.

Description of the Related Art

10: offshore structure 15: moon pool area

20: BOP Transporter

Claims (2)

  1. Inducing a tilt moment by using the BOP transporter 20 installed in the door pool area 15 in the center of the marine structure 10;
    Moving the test weight or the BOP itself on the BOP transporter 20 according to a predetermined movement path; And
    And moving to the predetermined movement path to obtain a vertical center value (VCG).
  2. According to claim 1, wherein the predetermined movement path of the BOP transporter 20, the center point of the movable distance of the BOP transporter 20 is designated as a reference point and moves from the reference point to the position determined in the starboard direction, The BOP transporter is characterized by moving from the last position to the reference point in the opposite port direction, moving back from the reference point to the position determined in the port direction, and moving from the last position of the port to the reference point in the opposite starboard direction. Tilt test method of ship used.
KR1020080048513A 2008-05-26 2008-05-26 Incline test method using BOP transporter KR101005897B1 (en)

Priority Applications (1)

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Publication number Priority date Publication date Assignee Title
KR101511209B1 (en) * 2010-10-08 2015-04-13 대우조선해양 주식회사 Damping apparatus for moon pool

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0124338B1 (en) * 1983-04-28 1988-06-08 Mobil Oil Corporation Wide based semi-submersible vessel
US6435123B1 (en) 1998-05-29 2002-08-20 øDEGAARD RUNE H. High speed hybrid marine vessel

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0124338B1 (en) * 1983-04-28 1988-06-08 Mobil Oil Corporation Wide based semi-submersible vessel
US6435123B1 (en) 1998-05-29 2002-08-20 øDEGAARD RUNE H. High speed hybrid marine vessel

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