CN104198179B - For the load test method of the sleeve pipe stretcher of jack-up unit - Google Patents
For the load test method of the sleeve pipe stretcher of jack-up unit Download PDFInfo
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- CN104198179B CN104198179B CN201410487315.3A CN201410487315A CN104198179B CN 104198179 B CN104198179 B CN 104198179B CN 201410487315 A CN201410487315 A CN 201410487315A CN 104198179 B CN104198179 B CN 104198179B
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Abstract
The present invention discloses a kind of load test method of sleeve pipe stretcher for jack-up unit, and this load test method comprises the following steps: S1, socle girder is moved to the left; S2, two these bases are moved respectively to front side, rear side; S3, the top of a frock is resisted against on snap ring, the bottom of frock and top are connected barge respectively and top is driven; S4, lifting is driven on top so that the bottom surface of barge distance water surface 0.5m-1m, then by all fit to two bases, retracting cylinder and snap ring and lock; S5, in barge, load water to safe working load, slowly decline top is driven; S6, start energy storage, the piston rod of oil cylinder stretches out and reaches maximum stroke; S7, close energy storage, keep 3min-5min, observe oil cylinder pressure whether decline. This invention ensures that higher security, simple to operate, utilize frock by test load acting on sleeve pipe stretcher safely and fast in narrow and small sleeve pipe tension platform.
Description
Technical field
The present invention relates to a kind of load test method of sleeve pipe stretcher for jack-up unit.
Background technology
At present, in the process of jack-up unit offshore oil drilling, drilling pipe is deep in seawater and inserts seabed and drill. In order to avoid drilling pipe to produce a bigger vertically impulse force upwards under by the effect of wave and ocean current, the top of sleeve pipe stretcher is provided with a preventer, so that drilling well payload segment is acted on sleeve pipe stretcher by preventer. Simultaneously, owing to the effect of temperature fluctuation and wave stream causes drilling pipe that the transverse movement of drilling pipe causes in the change of the length being perpendicular on water surface direction, so that sleeve pipe stretcher is produced a downward pulling force by this drilling pipe, in order to offset the stress that this drilling pipe is subject to, power is provided support by the flexible motion of the piston rod of sleeve pipe stretcher oil cylinder, improve the stressing conditions of drilling pipe to a great extent, it is to increase the security that drilling pipe uses and its in work-ing life. Therefore, being successfully completed of sleeve pipe stretcher load test is the key factor guaranteeing whole jack-up unit at sea job safety.
Summary of the invention
The technical problem to be solved in the present invention is the defects such as the load test method danger coefficient in order to overcome traditional sleeve pipe stretcher of the prior art is higher, complicated operation, it is provided that a kind of load test method of sleeve pipe stretcher for jack-up unit.
The present invention is solved the problems of the technologies described above by following technical proposals:
A kind of load test method of sleeve pipe stretcher for jack-up unit, this sleeve pipe stretcher comprises the base of two detachable connections, more than at least four even number oil cylinders, one retracting cylinder and the snap ring being arranged on this retracting cylinder end face, respectively this base is slidedly arranged in sleeve tension platform, on the sidewall of the detachable socle girder being connected to this jack-up unit of this sleeve pipe tension platform, the base plate of this base is respectively provided with this oil cylinder of equal amts, and the piston rod of each this oil cylinder is all connected with this retracting cylinder, the oil-in of those oil cylinders is connected with energy storage, this retracting cylinder is arranged with this snap ring is concentric, and retracting cylinder and this snap ring are a point half formula structure, its feature is, this load test method comprises the following steps:
S1, the socle girder of this jack-up unit is moved to the left so that the distance between the well heart of socle girder and the tail end of proper hull is 15mm-18mm, and sleeve pipe tension platform is reduced to working position;
S2, two bases are taken apart, retracting cylinder and snap ring are splitted into uniform two portions respectively simultaneously, and two these bases are moved 1m-4.57m respectively to front side, rear side;
S3, by a frock successively through this snap ring, retracting cylinder and sleeve pipe tension platform, meanwhile, the top of frock is resisted against the upper surface of this snap ring, by wireline, shackle, the bottom of this frock and top is connected a barge respectively and a top is driven;
S4, lifting is driven on this top so that the bottom surface of this barge distance water surface 0.5m-1m, then by all fit to two bases, retracting cylinder and snap ring and lock;
S5, in this barge, load water to safe working load, slowly this top of decline is driven so that frock is pressed on the snap ring of this sleeve pipe stretcher completely;
S6, start this energy storage, the piston rod of oil cylinder stretches out and reaches maximum stroke, keeps 3min-5min, the record piston rod stroke of oil cylinder and pressure;
S7, close this energy storage, keep 3min-5min, whether the pressure observing oil cylinder declines, record oil cylinder working-pressure and stroke;
S8, start this energy storage, the piston rod of oil cylinder is retracted, and this frock of lifting and barge are driven in top, two bases, retracting cylinder and snap ring are all opened, and transfer barge to the water surface.
In this scheme, adopt above-mentioned load test method, ensure that higher security, simple to operate, utilize in narrow and small sleeve pipe tension platform frock by test load safely and fast act on sleeve pipe stretcher, compact construction, not only ensure that the intensity of frock, and it is convenient to lifting operation, save experimentation cost.
Goodly, in step S1Also comprise the following steps before:
S11, by the spud leg of this jack-up unit insertion seabed;
S12, promote this proper hull, and load water in each ballast tank of this proper hull.
In this scheme, adopt above-mentioned steps, it is possible to guarantee that the testing circumstance of this load test method is consistent with the environment of sleeve pipe stretcher when normal operation, it is to increase the Stability and veracity of the load test of this sleeve pipe stretcher.
Goodly, in step S1In, the socle girder of this jack-up unit is moved to the left so that the distance between the well heart of socle girder and the tail end of proper hull is 15mm.
In this scheme, adopt aforesaid method step, not only avoid barge in load test process and strike the spud leg of jack-up unit, meanwhile, also reduce the labour intensity of movement.
Goodly, in step S2In, two these bases are moved 4.57m respectively to front side, rear side.
In this scheme, adopting aforesaid method step, avoiding frock hanging produces to rock collision sleeve pipe stretcher in fortune barge process and damages sleeve pipe stretcher, it is to increase the security of load test.
Goodly, in step S3In, this frock comprises a plate, the front surface at the top of this web plate and rear surface are all outward extended with one first cylindrical boss, the front surface of the bottom of this web plate and rear surface are all outward extended with one the 2nd cylindrical boss, those first cylindrical boss are fixed between the two side in opening portion of shackle by an ergometer, and this ergometer is through the top of this shackle, the first cylindrical boss and web plate, this ergometer is electrically connected with a pressure display unit, and this top is driven and is connected on this ergometer by wireline;
Those the 2nd cylindrical boss are fixed on by a bolt between the two side in opening portion of another shackle, and this bolt-through is in the bottom of this shackle, the 2nd cylindrical boss and web plate, and this barge is connected to this by wireline and unloads and buckle.
In this scheme, adopt aforesaid method step so that can in narrow and small sleeve pipe tension platform by test load safely and fast act on sleeve pipe stretcher, it is to increase the operability of load test and security. Meanwhile, it is connected with ergometer unloading to buckle, it is possible to the load loaded on convenient barge accurately is safe working load.
Goodly, in step S4In, lifting is driven on this top so that the bottom surface distance water surface 0.5m of this barge.
In this scheme, adopt aforesaid method step, not only avoid that the bottom surface distance water surface because of barge is too low causes wave that the bottom of barge is produced thrust, also avoid simultaneously the bottom surface of the barge distance water surface too high time wire cable rupture time the potential safety hazard that occurs.
Goodly, in step S6In, starting this energy storage, the piston rod of oil cylinder stretches out and reaches maximum stroke, keeps 5min, the piston rod stroke of record oil cylinder and pressure.
In this scheme, adopt aforesaid method step, it is possible to guarantee the stroke of the piston rod of this oil cylinder and the stability of force value, it is possible to verify that sleeve pipe stretcher is under safe working load 272 tons more accurately, hydraulic ram can stretch out maximum stroke, and can provide stable anchorage force.
Goodly, in step S7In, close this energy storage, keep 5min, whether the pressure observing oil cylinder declines, record oil cylinder working-pressure and stroke.
In this scheme, adopt aforesaid method step, it is possible to verifying that sleeve pipe stretcher is under safe working load 272 tons more accurately, the piston rod of oil cylinder can not be moved when closing energy storage, and can keep lasting tensioning power.
Goodly, step S8Comprise the following steps afterwards:
S81, remove that top is driven, frock, wireline, shackle and barge, barge is removed;
S82, by sleeve pipe tension platform reset, socle girder reset.
On the basis meeting this area general knowledge, above-mentioned each optimum condition, can arbitrary combination, obtain the preferred embodiments of the invention.
The positive progressive effect of the present invention is:
This invention ensures that higher security, simple to operate, utilize in narrow and small sleeve pipe tension platform frock by test load safely and fast act on sleeve pipe stretcher, compact construction, not only ensure that the intensity of frock, and it is convenient to lifting operation, save experimentation cost.
Accompanying drawing explanation
Fig. 1 is the structural representation of sleeve pipe stretcher.
Fig. 2 is the testing condition structural representation of the load test method of the sleeve pipe stretcher of the better embodiment of the present invention.
Fig. 3 is the structure for amplifying schematic diagram of part A in Fig. 2.
Description of reference numerals:
Sleeve pipe stretcher: 1 base: 11 oil cylinders: 12
Retracting cylinder: 13 snap rings: 14 additional oil cylinders: 15
Sleeve pipe tension platform: 2
Slip plate: 3
Socle girder: 4
Frock: 5 web plates: 51 first cylindrical boss: 52
2nd cylindrical boss: 53 ergometers: 54 shackles: 55
Bolt: 56 wireline: 57 strongbacks: 58
Barge: 6
Top is driven: 7
Embodiment
Below for a better embodiment, and come by reference to the accompanying drawings clearer the present invention to be intactly described.
In describing the invention, it will be appreciated that, term " on ", D score, "front", "rear", "left", "right", " vertically ", " level ", " top ", " end " " interior ", the orientation of the instruction such as " outward " or position are closed is based on orientation shown in the drawings or position relation, it is only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device referred to or element must have specific orientation, with specific orientation structure and operation, therefore can not be interpreted as limitation of the present invention.
Please understood according to Fig. 1, base more than 11, at least four even number oil cylinder 12, retracting cylinders 13 that this sleeve pipe stretcher 1 comprises two detachable connections and the snap ring 14 being arranged on retracting cylinder 13 end face. Wherein, each base 11 is fixed on a slip plate 3, and slip plate 3 is slidedly arranged in sleeve tension platform 2, on the sidewall of this sleeve pipe tension platform 2 by four detachable socle girders 4 being connected to jack-up unit of bearing pin. And socle girder is a rectangular structure.
Simultaneously, the oil cylinder 12 being provided with equal amts on each base 11 on base plate, and the piston rod of each oil cylinder 12 is all connected with retracting cylinder 13, the oil-in of those oil cylinders 12 is connected with energy storage, this retracting cylinder 13 is arranged with snap ring 14 is concentric, and retracting cylinder 13 is a point half formula structure with this snap ring 14.
In the use procedure of reality, the outer wall of drilling unit drill bit at work is arranged with sleeve (not shown), and between sleeve pipe and drill bit, is formed with a cavity. In order to avoid sleeve pipe to rock in a lateral direction, being also provided with some additional oil cylinders 15 on each base 11, those additional oil cylinders 15 are arranged along the even interval of circumferential direction of sleeve pipe, and for against the outer wall living this sleeve pipe.
Wherein, operationally, sleeve pipe is by the through hole at retracting cylinder 13 center, and its top is fixedly connected with snap ring 14 for sleeve pipe stretcher 1, energy storage is communicated by hydraulic power line and oil cylinder 12 times end rodless cavities, and the pressure then increasing energy storage makes the piston rod of oil cylinder 12 stretch out and reach the tension force of sleeve pipe setting. When wave or action of ocean current are in sleeve pipe, forcing casing buckling to be out of shape, its longitudinal length shortens, now the piston rod of oil cylinder 12 is retracted, and can compensate the change of the longitudinal distance of drill conductor, the top tension force of sustainable offer sleeve pipe setting simultaneously, improve the force-bearing situation of sleeve pipe, it is to increase its in work-ing life. During deepwater work, sleeve pipe stretcher 1 provides the vertical direction tensioning power of sleeve pipe one upwards 272 tons.
For this reason, safe working load 272 ton hour is applied at sleeve pipe stretcher 1 in order to verify, oil cylinder 12 can stretch out 600mm stroke, and stable anchorage force can be provided, when closing energy storage, oil cylinder 12 can not be moved, and the present invention provides a kind of load test method of sleeve pipe stretcher 1 for jack-up unit.
Please being understood according to Fig. 2, this load test method comprises the following steps.
Step 100, by the spud leg of this jack-up unit insertion seabed, promotes this proper hull, and loads water in each ballast tank of this proper hull.
In this step, can guarantee that the testing circumstance of this load test method is consistent with the environment of sleeve pipe stretcher 1 when normal operation like this, it is to increase the Stability and veracity of the load test of this sleeve pipe stretcher 1.
Step 101, is moved to the left the socle girder 4 of this jack-up unit so that the distance between the well heart of socle girder 4 and the tail end of proper hull is 15mm-18mm, and sleeve pipe tension platform 2 is reduced to working position. Wherein, the well heart of socle girder 4 and the center alignment of sleeve pipe stretcher 1, and the center of sleeve pipe stretcher 1 all the time with rig floor center alignment.
In this step, the socle girder 4 of this jack-up unit is moved to the left so that the distance between the well heart of socle girder 4 and the tail end of proper hull is preferably 15mm. In so avoiding barge 6 in load test process and strike the spud leg of jack-up unit, meanwhile, also reduce the labour intensity of movement.
Two bases 11 are taken apart by step 102, retracting cylinder 13 and snap ring 14 are splitted into uniform two portions respectively simultaneously, and respectively to front side, rear side, two these bases 11 are moved 1m-4.57m. The center that can make sleeve pipe stretcher 1 so all the time with rig floor center alignment.
In this step, two these bases 11 are preferably moved 4.57m respectively to front side, rear side. This avoid frock 5 hanging produces to rock collision sleeve pipe stretcher 1 in fortune barge 6 process and damages sleeve pipe stretcher 1, it is to increase the security of load test.
Step 103, by a frock 5 successively through this snap ring 14, retracting cylinder 13 and sleeve pipe tension platform 2, meanwhile, the top of frock 5 is resisted against the upper surface of snap ring 14, by wireline 57, shackle 55, the bottom of frock 5 and top is connected a barge 6 respectively and a top drives 7. In the present embodiment, the top of frock 5 is provided with a strongback 58, and the bottom surface of this strongback 58 is resisted against the upper surface of snap ring 14.
Please understood according to Fig. 2-3, this frock 5 comprises a plate 51, the front surface at the top of web plate 51 and rear surface are all outward extended with one first cylindrical boss 52, and the front surface of the bottom of this web plate 51 and rear surface are all outward extended with one the 2nd cylindrical boss 53.
Wherein, those first cylindrical boss 52 are fixed on by an ergometer 54 between the two side in opening portion of shackle 55, and ergometer 54 is through the top of this cylindrical boss 52 of shackle 55, first and web plate 51. This ergometer 54 is electrically connected with a pressure display unit, and this top is driven 7 and is connected on this ergometer 54 by wireline 57.
Simultaneously, those the 2nd cylindrical boss 53 are fixed between the two side in opening portion of another shackle 55 by a bolt 56, and bolt 56 is through the bottom of this shackle 55, the 2nd cylindrical boss 53 and web plate 51, barge 6 is connected in shackle 55 by wireline 57.
In the present embodiment, adopt aforesaid method step so that can in narrow and small sleeve pipe tension platform 2 by test load safely and fast act on sleeve pipe stretcher 1, it is to increase the operability of load test and security. Meanwhile, shackle 55 is connected with ergometer 54, it is possible to the load loaded on convenient barge 6 accurately is safe working load.
Step 104, drives 7 liftings by top so that the bottom surface of this barge 6 distance water surface 0.5m-1m, then by all fit to two bases 11, retracting cylinder 13 and snap ring 14 and lock.
In step S4In, top is driven 7 liftings so that the bottom surface distance water surface 0.5m of this barge 6. In so avoiding that the bottom surface distance water surface because of barge 6 is too low causes wave that the bottom of barge 6 is produced thrust, also avoid simultaneously the bottom surface of the barge 6 distance water surface too high time the potential safety hazard that occurs when rupturing of wireline 57.
Step 105, loads water to safe working load in this barge 6, and slowly this top of decline drives 7 so that frock 5 is pressed on the snap ring 14 of this sleeve pipe stretcher 1 completely.
Step 106, starts this energy storage, and the piston rod of oil cylinder 12 stretches out and reaches maximum stroke, keeps 3min-5min, the piston rod stroke of record oil cylinder 12 and pressure. In the use procedure of reality, jack-up unit also comprises a control device, and control device comprises a controller and a control panel. This controller is electrically connected with energy storage, oil cylinder and running status for controlling energy storage, oil cylinder, and this control panel is electrically connected the pressure for give an order signal and display energy storage, oil cylinder and stroke with this controller.
Wherein, what energy storage was relative position one provides pressure to ensure continuing and balance of load to oil cylinder 12. At this, after starting this energy storage, operation control panel, the piston rod of oil cylinder 12 is made to protrude upward 600mm stroke, keeping 3min-5min, observe the pressure reading change of oil cylinder 12, reading does not change and oil cylinder 12 stroke can not decline just demonstrates the anchorage force that sleeve pipe stretcher 1 can provide stable.
In this step, starting energy storage, the piston rod of oil cylinder 12 stretches out and reaches maximum stroke, keeps 5min, the piston rod stroke of record oil cylinder 12 and pressure. The stroke of piston rod and the stability of force value of this oil cylinder 12 can be guaranteed like this, it is possible to verifying that sleeve pipe stretcher 1 is under safe working load 272 tons more accurately, hydraulic ram 12 can stretch out maximum stroke, and can provide stable anchorage force.
Step 107, closes energy storage, keeps 3min-5min, and whether the pressure observing oil cylinder 12 declines, record oil cylinder 12 pressure and stroke.
In this step, closing this energy storage, keep 5min, whether the pressure observing oil cylinder 12 declines, record oil cylinder 12 pressure and stroke. Can verifying that sleeve pipe stretcher 1 is under safe working load 272 tons so more accurately, when closing energy storage, the piston rod of oil cylinder 12 can not be moved, and can keep lasting tensioning power.
Step 108, starts this energy storage, and the piston rod of oil cylinder 12 is retracted, and this frock 5 of 7 liftings and barge 6 are driven in top, two bases 11, retracting cylinder 13 and snap ring 14 are all opened, and transfer barge 6 to the water surface.
Step 109, remove that top drives 7, frock 5, wireline 57, shackle 55 and barge 6, barge 6 is removed.
Step 110, resets sleeve pipe tension platform 2, and socle girder 4 resets.
In sum, this invention ensures that higher security, simple to operate, utilize in narrow and small sleeve pipe tension platform frock by test load safely and fast act on sleeve pipe stretcher, compact construction, not only ensure that the intensity of frock, and it is convenient to lifting operation, save experimentation cost.
Although the foregoing describing the specific embodiment of the present invention, but it will be understood by one skilled in the art that this is only illustrate, protection scope of the present invention is defined by the appended claims. The technician of this area is under the prerequisite of the principle and essence that do not deviate from the present invention, it is possible to these enforcement modes are made various changes or modifications, but these change and amendment all falls into protection scope of the present invention.
Claims (8)
1. the load test method for the sleeve pipe stretcher of jack-up unit, this sleeve pipe stretcher comprises the base of two detachable connections, more than at least four even number oil cylinders, one retracting cylinder and the snap ring being arranged on this retracting cylinder end face, respectively this base is slidedly arranged in sleeve tension platform, on the sidewall of the detachable socle girder being connected to this jack-up unit of this sleeve pipe tension platform, the base plate of this base is respectively provided with this oil cylinder of equal amts, and the piston rod of each this oil cylinder is all connected with this retracting cylinder, the oil-in of those oil cylinders is connected with energy storage, this retracting cylinder is arranged with this snap ring is concentric, and retracting cylinder and this snap ring are a point half formula structure, it is characterized in that, this load test method comprises the following steps:
S1, the socle girder of this jack-up unit is moved to the left so that the distance between the well heart of socle girder and the tail end of proper hull is 15mm-18mm, and sleeve pipe tension platform is reduced to working position;
S2, two bases are taken apart, retracting cylinder and snap ring are splitted into uniform two portions respectively simultaneously, and two these bases are moved 1m-4.57m respectively to front side, rear side;
S3, by a frock successively through this snap ring, retracting cylinder and sleeve pipe tension platform, meanwhile, the top of frock is resisted against the upper surface of this snap ring, by wireline, shackle, the bottom of this frock and top is connected a barge respectively and a top is driven;
S4, lifting is driven on this top so that the bottom surface of this barge distance water surface 0.5m-1m, then by all fit to two bases, retracting cylinder and snap ring and lock;
S5, in this barge, load water to safe working load, slowly this top of decline is driven so that frock is pressed on the snap ring of this sleeve pipe stretcher completely;
S6, start this energy storage, the piston rod of oil cylinder stretches out and reaches maximum stroke, keeps 3min-5min, the record piston rod stroke of oil cylinder and pressure;
S7, close this energy storage, keep 3min-5min, whether the pressure observing oil cylinder declines, record oil cylinder working-pressure and stroke;
S8, start this energy storage, the piston rod of oil cylinder is retracted, and this frock of lifting and barge are driven in top, two bases, retracting cylinder and snap ring are all opened, and transfer barge to the water surface;
In step S3In, this frock comprises a plate, the front surface at the top of this web plate and rear surface are all outward extended with one first cylindrical boss, the front surface of the bottom of this web plate and rear surface are all outward extended with one the 2nd cylindrical boss, those first cylindrical boss are fixed between the two side in opening portion of shackle by an ergometer, and this ergometer is through the top of this shackle, the first cylindrical boss and web plate, this ergometer is electrically connected with a pressure display unit, and this top is driven and is connected on this ergometer by wireline;
Those the 2nd cylindrical boss are fixed on by a bolt between the two side in opening portion of another shackle, and this bolt-through is in the bottom of this shackle, the 2nd cylindrical boss and web plate, and this barge is connected to this by wireline and unloads and buckle.
2. load test method as claimed in claim 1, it is characterised in that, in step S1Also comprise the following steps before:
S11, by the spud leg of this jack-up unit insertion seabed;
S12, promote this proper hull, and load water in each ballast tank of this proper hull.
3. load test method as claimed in claim 1, it is characterised in that, in step S1In, the socle girder of this jack-up unit is moved to the left so that the distance between the well heart of socle girder and the tail end of proper hull is 15mm.
4. load test method as claimed in claim 1, it is characterised in that, in step S2In, two these bases are moved 4.57m respectively to front side, rear side.
5. load test method as claimed in claim 1, it is characterised in that, in step S4In, lifting is driven on this top so that the bottom surface distance water surface 0.5m of this barge.
6. load test method as claimed in claim 1, it is characterised in that, in step S6In, starting this energy storage, the piston rod of oil cylinder stretches out and reaches maximum stroke, keeps 5min, the piston rod stroke of record oil cylinder and pressure.
7. load test method as claimed in claim 1, it is characterised in that, in step S7In, close this energy storage, keep 5min, whether the pressure observing oil cylinder declines, record oil cylinder working-pressure and stroke.
8. such as load test method as described in any one in claim 1-7, it is characterised in that, step S8Comprise the following steps afterwards:
S81, remove that top is driven, frock, wireline, shackle and barge, barge is removed;
S82, by sleeve pipe tension platform reset, socle girder reset.
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| CN201410487315.3A CN104198179B (en) | 2014-09-22 | 2014-09-22 | For the load test method of the sleeve pipe stretcher of jack-up unit |
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| CN201410487315.3A CN104198179B (en) | 2014-09-22 | 2014-09-22 | For the load test method of the sleeve pipe stretcher of jack-up unit |
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| CN109422200B (en) * | 2017-09-04 | 2020-10-13 | 烟台中集来福士海洋工程有限公司 | Installation method of tensioning hydraulic cylinder of drilling platform marine riser |
| CN109060336A (en) * | 2018-08-31 | 2018-12-21 | 华南理工大学 | A kind of Z-type Automatic Wedge Belt Tensioner test device |
| CN110296821B (en) * | 2019-06-27 | 2021-05-04 | 宝鸡石油机械有限责任公司 | Steel wire rope type riser tensioner compensation function test device and test method |
| CN111337281A (en) * | 2020-03-09 | 2020-06-26 | 招商局重工（江苏）有限公司 | Method for heavy-load test of semi-submersible type hoisting and disassembling platform |
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