Crane Barge Research Articles

Study on the effects of lifting loads on the longitudinal strength of a crane barge during heavy lifting operations due to various angle of crane rotation

The different positions of lifting loads on a crane barge during Heavy Lifting operations have a significant impact on longitudinal strength. This study focuses on the analysis of longitudinal strength on a crane barge with a configuration of Topside structure loading direction during the installation. The variations used the crane rotation angle from starboard to bow at 15° increments. The results showed that the load distribution for all variations followed similar trendlines, using analytical and numerical methods. Significant changes occurred at frame 3–19 as the location of the superstructure, frame 13–40 as the ballast tank loads, and frame 45–55 as the lifting loads. Regarding the maximum shear force and bending moment, occurred when the net load changes from positive to negative and the position of the crane. The maximum shear force occurred at frame 40, while the maximum bending moment occurred at frame 47, 48, and 49. The comparison between analytical and numerical methods for shear force and bending moment showed that the error values are below 5% of the allowable value according to the DNV standards.

Intact stability analysis of crane barge due to loading orientation effect during heavy lifting operation

Changes in the position of the lifting load on the crane barge during heavy lifting operation significantly affect the stability of the vessel. The changes in stability during this heavy lifting operation must be analysed to prevent operational failures. This study conducted an intact stability analysis of the crane barge during lifting of topside structures in the installation phase. The analysis was performed with variations in the position of the lifted load from starboard to bow for every 15° change in the crane angle. The stability results of the Crane Barge for all variations, using both analytical and numerical methods, have met the IMO requirements. The extreme condition occurred in load case 8, with a maximum GZ value of 2.904 m at a 22° angle and an area of 103,894 m.deg. The comparison of the stability results of the crane barge during the structural lifting operation using analytical calculation and numerical methods indicates that the overall validation error values have met the ±5% requirement according to the ABS Rules. However, when considering the corrections for changes in the lifting load moment in the analytical calculation, stability error values increase significantly as the heeling angle of the vessel increases.

Decision Analysis of Offshore Channel Maintenance Dredging in PT. PQR

The offshore channel maintenance dredging completion date, which was performed by PT. ABC (PT. PQR’s contractor) using crane barge XYZ, was delayed to 19 May 2023 (43.4 days delayed). Two main problem were identified using Kepner Tregoe Situation Analysis (KT-SA) based on the company data processing and one most main contributing problem (lack of daily sediment production; the initial plan was 1500 m3/day) then be analyzed using Kepner Tregoe Problem Analysis (KT-PA) and the root cause was constructed using cause-map with brainstorming method included in the process between author and some of PT. ABC dredging crew in crane barge XYZ. Substitute, Combine, Adapt, Modify, Put on another use, Eliminate, Rearrange (SCAMPER) technique then be brought in the brainstorming session with PT. ABC dredging crew on crane barge ABC to bring alternative solutions for the root cause of the problem. Furthermore, the SCAMPER result be brought to brainstorming with PT. PQR dredging operation assistant manager, as the problem holder and matter expert, and filtered to three most possible alternative solutions. These three most possible solutions then examined using Simple Multiple Attribute Rating Technique (SMART) method with eight stages were performed. The criteria used in this method are offshore channel dredging project cost, offshore channel dredging project schedule, coordination with other entity, and permit to work (PTW) & derogation. The objectives of this research are knowing what factors affecting the dredging project in PT. PQR offshore channel case and the alternative solution to be brought in the next offshore channel maintenance dredging.

Experimental Study on Coupled Motion of Floating Crane Barge and Lifted Module in Irregular Waves

Installation and decommissioning activities of offshore structures often applied a floating crane barge for a lifting operation. The excessive movement response of lifted module affected by the motion of floating crane barge in waves can increase a large amplitude. However, the coupled motions of a floating crane barge and lifted module are not easy to predict accurately due to the dynamic movement of a lifted module and the complex coupling system. The coupled motion responses of a floating crane barge and a lifted module during lifting operation were investigated based on time domain by experimental method in this study. The model tests are carried out at Manoeuvring and Ocean Basin of Indonesian Hydrodynamic Laboratory, BRIN. The experimental conditions include the load cases of without and with a load of lifted module in crane tip, and the lifting operation was evaluated under irregular wave conditions. The experimental results show in that the phenomena of shift resonant frequency for the dynamic responses are clearly observed on the coupled motion of multibody system. The dynamic oscillations of the lifted module have a significant effect on the motion response of the floating crane barge. And the hoisting of lifted module has an obstructed effect on the rolling motion of crane barge.

Analisis Kekuatan Forward Storage Platform Pada Kapal 50 Pax Crane Barge dengan Metode Elemen Hingga

Hull construction must comply with the rules or classifications that have been recognized in the world of international shipping, in designing a storage platform designed by PT. X is designed for partners based reference, as a rule forms the design and calculations no rules. As for the mechanical properties of the material provisions remain in rules. Rules are used for shipbuilding 50 P.A.X crane barge is that BV (Bureau Veritas) rules. The analysis in this study using the finite element method-based software. With the software will be able to look forward strength and simulation constructs storage platforms that will support the weight of 6,4 tons (3,2 tons on portside and 3,2 tons on start board) in a static condition, dynamic, and impact. It aims to anticipate the possibility of the construction design error forward storage platform that could lead to an accident on the ship. Construction material storage platform forward using BV grade A steel.

ALOKASI KEBUTUHAN ALAT BERAT PADA PEKERJAAN NORMALISASI MUARA SUNGAI SIBELIS KOTA TEGAL

The estuary of River Sibelis is vessel traffic modes of fishermen and the risk rob flooding. The estuary of River Sibelis (STA 0+00 – STA 0+373) project employed some heavy equipment to undertake the project. The purpose of find out the needs of heavy equipment, productivity of heavy equipment, the duration of work and heavy equipment operational cost. The required data were of layouts, cross sectional drawings of the river estuary, and specifications of heavy equipment. Microsoft Excel program was applied for the calculation and the schedule using method Barchart.The implementation results are as follow: 1) exavating sediment on 29 work days using 1 unit of crane barge in productivity of 80.8 m3/h at Rp. 1.120.384.700,- ; 2) excavating sediment on 16 work days using 2 units of backhoe, 2 units of barge, and 1 unit of tug boat in productivity of 48 m3/h at Rp.351.309,- ; 3) setting sheet pile on 33 work days using 2 units of crawler crane, 1 unit of diesel hammer, 1 unit of tug boat, and 2 units of barge in productivity of 11 m/h at Rp. 805.385.500,-; at total cost project of Rp. 2.846.349.000,- on 63 work days. Keywords: heavy equipment, productivity, time, cost

KEBIJAKAN PENGENDALIAN RESIKO KESELAMATAN DAN KESEHATAN KERJA PADA TENAGA KERJA (Studi pada Pekerjaan Pengangkatan di Crane Barge Palong III PT. Tanjungpura Balikpapan)

The process of identifying risks and risks is part of policy and risk. Risk control is carried out for efforts to prevent occupational diseases and accidents. To learn about ways to handle risks to the crane barge. This research is a descriptive study, from the time process of this research is a direct research. This research is located at Palong III barge crane PT. Putra Tanjungpura Balikpapan. The method used by researchers in making measurements, information used by companies. In this study, primary data can be used at the same time and direct data that works on location and secondary data obtained from the company. Risk assessment is carried out using the JRA method (Job Risk Assessment and Risk Matrix. In the risk process, finding 12 types of risks, namely 5 risks with low risk levels, 2 risks with moderate levels, 4 risks with risk levels and 1 risk with risk level Things which must be done regularly to achieve different goals, and the results of risks that are effective and efficient. Keywords: Policy, Risk control policy, risk assessment

Dynamic prioritization of equipment and critical failure modes

PurposeThe purpose of this paper is to identify critical equipment by dynamically ranking them in interval-valued intuitionistic fuzzy (IVIF) circumstances. Accordingly, the main drawbacks of the conventional failure mode and effects analysis (FMEA) are eliminated. To this end, the authors have presented the interval-valued intuitionistic fuzzy condition-based dynamic weighing method (IVIF-CBDW).Design/methodology/approachTo realize the objective, the authors used the IVIF power weight Heronian aggregation operator to integrate the data extracted from the experts’ opinions. Moreover, the multi-attributive border approximation area comparison (MABAC) method is applied to rank the choices and the IVIF-CBDW method to create dynamic weights appropriate to the conditions of each equipment/failure mode. The authors proposed a robust FMEA model where the main drawbacks of the conventional risk prioritization number were eliminated.FindingsTo prove its applicability, this model was used in a case study to rank the equipment of a HL5000 crane barge. Finally, the results are compared with the traditional FMEA methods. It is indicated that the proposed model is much more flexible and provides more rational results.Originality/valueIn this paper, the authors have improved and used the IVIF power weight Heronian aggregation operator to integrate information. Furthermore, to dynamically weigh each equipment (failure mode), they presented the IVIF-CBDW method to determine the weight of each equipment (failure mode) based on its equipment conditions in the O, S and D criteria and provide the basis for the calculation. IVIF-CBDW method is presented in this study for the first time. Moreover, the MABAC method has been performed, to rank the equipment and failure mode. To analyze the information, the authors encoded the model presented in the robust MATLAB software and used it in a real sample of the HL5000 crane barge. Finally, to evaluate the reliability of the model presented in the risk ranking and its rationality, this model was compared with the conventional FMEA, fuzzy TOPSIS method, the method of Liu and the modified method of Liu.

THE INTERNATIONAL LAW REGARDING SHIP-SOURCE POLLUTION LIABILITY AND COMPENSATION: EVOLUTION AND CURRENT CHALLENGES

THE INTERNATIONAL LAW REGARDING SHIP-SOURCE POLLUTION LIABILITY AND COMPENSATION: EVOLUTION AND CURRENT CHALLENGES

Subsea Gas Pipeline Risk Assessment During Hot Tapping Installation

This paper examines the risk to subsea gas pipeline during hot-tapping installation process. Hot tapping is one method to connect new pipeline to existing pipeline while they remain in service. In this study it is considered that hot tapping is installed using crane barge. To assure the crane barge in steady position, the crane barge is moored by means of mooring chain at several locations. These mooring activities and hot tapping installation possess potential risk to existing subsea facilities. Hence, in general there are two objectives in this study such as: determining the safe distance between mooring chain for and the existing facilities, and performing risk level due to external load that may occurs during installation. The risk level is determined by analyzing frequency and its consequence then will be mapped into risk matrix according to DNV-RP-F107. From mooring distance analysis, the result can be used as a reference for positioning the mooring point of crane barge. Based on the result of risk assessment to facilities, risks due to external load such as dropped anchor, dragged anchor, ship sinking and dropped object are in the as low as reasonably practicable (ALARP) region which mean, in the practical life risks are acceptable as long as the frequency is maintained in the lowest rank.

Nonlinear hydrodynamic responses of submerged moving payload in vicinity of a crane barge in waves

The wave interaction with a submerged cylindrical payload subjected to constrained motions in presence of a nearby floating crane barge is investigated in the three-dimensional numerical wave tank using a fully nonlinear potential flow model in the time domain. Numerical simulations are carried out to investigate the hydrodynamic features of this submerged payload under pendulum motion in water waves as well as while it moves towards the sea bed at a constant vertical velocity. It is known that the presence of multiple side by side floating bodies in waves can create significant drift motion. In the present study the similar drift motion is observed for the side by side floating barge and submerged payload and it appears that the submerged payload under constrained motions may face a very large mean drift motion of nearly seven times that of the incident wave amplitude in the beam sea upstream condition. Emphasis is also given towards investigating and understanding the influences of natural frequency of the payload and shielding effect due to the presence of the floating barge. It is found that natural frequency coupled with shielding effect generates remarkable low frequency components in payload responses both in the head sea and the beam sea situations. The effect of different cable lengths, wave maker frequencies and downward moving velocities on payload responses under several geometric setups are studied and compared, and interesting features such as increased low frequency movement of the payload near the natural frequency region and existence of considerable low frequency motions even at a greater depth (while the payload is quite below the free surface) are observed.

Mooring Pattern Optimization Using A Genetic Algorithm

In this paper, a constraint Genetic Algorithm is used for the purpose of mooring pattern optimization. The Genetic Algorithm is applied through a mathematical formulation which is introduced to define a typical mooring system optimization problem. The mathematical formulation is used in a case study on a spread moored crane barge, operating in the vicinity of a jacket type platform, in order to minimize its surge motions towards the platform. For this purpose, a set of criteria regarding clearances between anchors and seabed preinstalled facilities (pipelines), and also between the crane barge and the jacket platform are presented and considered. An automatic process of repetitive analyses implementing a MATLAB code as an interface between the Genetic Algorithm and a mooring system analysis program is used, and an optimum solution is resulted by performing 4000 quasi-dynamic analyses in time domain. The effectiveness of the Genetic Algorithm in leading to an optimum mooring system pattern is studied and it is shown that using a proper formulation of the problem, the Genetic Algorithm can be a very useful tool for finding an optimum pattern for mooring systems in fields with constraints on anchor locations and vessel motions.

파랑 중 해상 크레인의 하강 작업 수치 시뮬레이션

A coupled analysis of a floating crane barge with a crane wire and hanging structure is carried out in thetime domain. The motion analysis of the crane barge is based on the floating multi-body dynamics, and thecrane wire is modeled as a simple spring tension. The hanging structure is assumed to be a rigid body with 3 degree-of-freedom translational motion. In this study, numerical simulations were conducted at three different stages. First, the developed code was validated by comparing the time-domain motion response of a crane barge with the frequency-domain results. Then, a coupled analysis of a crane barge and simple structure hanging by the crane wire was performed using the present scheme. The motion response and wire tension from the present calculations are compared with the results of OrcaFlex. The agreement between the two sets of results isfairly good. Last, lowering simulations in regular and irregular waves were conducted considering buoyancy changes in the hanging structure. The effects of the wave conditions, structure's weight, wire length, and lowering speed on the wire tension are considered.

Model Test Investigation on a J-Lay System Designed for Deepwater Pipeline Installation in South China Sea

A J-lay crane barge named Double-8000, the two cranes of which have the lifting capacity of up to 8000t, is about to be constructed by Offshore Oil Engineering Co., Ltd. (COOEC) in order to meet the requirements of oil and gas development in South China Sea. This paper presents the overall structure design of the J-lay system and corresponding method for strength calculation. The hardware and software for the J-lay control system are also developed. The model test on such a designed J-lay system along with its control system is investigated by applying the similarity theory and the hybrid model test method. A specially designed platform simulating the motion of the crane barge in 6 degree-of-freedom (6-DOF) in different sea conditions is used for the model testing in order to get the results of the influence of the crane motion on the performance of the J-lay system. The model tests verify the functionality and safety performance of the system. The results show that the test data are in good agreement with the numerical simulation. It can be seen that the J-lay system can meet the challenging requirements of Double-8000 for pipeline laying in waters deep to 3000m in South China Sea.

Dynamic factor analysis considering elastic boom effects in heavy lifting operations

The dynamic factor is the ratio of the maximum dynamic load to the static load acting on the wire ropes between the boom of a floating crane and a cargo. In this paper, the dynamic factor is analyzed based on dynamic simulations of a floating crane and a cargo, considering an elastic boom. For the simulation, we designed a multibody system that consists of a floating crane barge, an elastic boom, and a cargo connected to the boom through wire ropes. The dynamic equations of motion of the system are based on flexible multibody system dynamics. Six-degree-of-freedom motions are considered for the floating crane and for the cargo, and three-dimensional deformations for the elastic boom. The hydrostatic force, the hydrodynamic force, the gravitational force, and the wire rope forces are considered as external forces. The dynamic factor is obtained by numerically solving the equation. The effects of the elastic boom on heavy cargo lifting are discussed by comparing the simulation results of an elastic boom and a rigid boom.

Model test investigation on an innovative lifting system for deepwater riser installation

An S-lay crane barge, named CNOOC 201, has been built for pipe laying in deepwater oil/gas fields in the South China Sea. It is due to be commissioned by the end of the year 2010. A special lifting system is developed to meet the challenge that installing deepwater risers from an S-lay barge is difficult and has not been achieved. The purpose of this paper was to investigate the model test on such an innovative system, which has to be done before field application. By applying the similarity theory, the movement of the S-lay barge is simulated through a six degrees-of-freedom motion platform, and a truncated model riser is utilized for the model testing. The displacement and force boundary conditions at the truncated position of the riser are obtained from the catenary governing equation and become realized by a slideway cart and a loading system designed to control the configuration of the model riser, which presents a similar configuration to a real riser in deepwater. The test results are in very good agreement with theoretical calculations, showing that the active truncated test is applicable for controlling the configuration of the deepwater riser in model testing investigation.

Development of the oil skimmer used by crane barge in emergency

Development of the oil skimmer used by crane barge in emergency

Numerical Simulation for Collapse Process of Armor Blocks Connected with Wire under High Waves

To repair armor blocks damaged by high waves, an expensive in-water repair work using a crane barge must be done. A wire connection with among blocks can be effective to save maintenance cost. But, to conduct hydraulic experiment of among blocks connected by wire is considerably difficult because of a lack of a physical model of wire satisfying dynamic similarity. In the present study, simple wire model based on the distinct element method has been developed to investigate the effect of wire connection of armor blocks as a resistance of damage under high waves. Validation of developed wire model is conducted by comparing model predictions with field observations.

허베이 스피리트호 기름유출사고를 통해 본 재난보도의 문제점

On 7 December 2007, the Hong Kong registered tanker Hebei Spirit, laden with 209,000 tonnes of crude oil, was struck by the crane barge Samsung No 1, whilst at anchor about five miles off Taean on the West Coast in Korea. About 10,500 tonnes of crude oil escaped into the sea from the Hebei Spirit. The recent oil leakage from a tanker in seas off Taean has turned the sea farms and fishing areas on the country`s western coast into a sea of oil. Analysts say the spill is considered as one of the world`s devastating sea pollution cases involving oil. In our contemporary society where people are exposed to potential dangers in every aspect, no one can be free from such dangers. With an increase in human casualties due to disaster, disaster reporting plays a vital role in preventing and minimizing damages. Despite such enormous significance, however, Korean disaster reporting has not performed effectively. In this contexts, this study analyzed the problems of disaster reporting in Korea, with the case of Hebei Spirit oil Spill in Taean-gun. And, this study suggest the establish ways and means needed to improve the disaster reporting in Korea with the case of Hebei Spirit case.

DEVELOPMENT OF AN OIL SKIMMER OPERATED BY CRANE BARGES

ABSTRACT This paper reports about an oil skimming system for crane barges. It was tested with heavy fuel oil and emulsion in a large test tank and its operational test was carried out at SAKAI PORT in Japan. We can estimate performance of the skimmer from experiment data in large test tank, recovering C heavy fuel oil and its emulsion in waves. Estimated oil recovery rate is 5.9tlh and recovery efficiency is 70% when the oil slick thickness is about 2 cm. The recovery rate is equal to, and the recovery efficiency is 2 times higher than the performance of the grab-bucket (capacity 4m3). As a result of the field test, we can propose the oil skimmer as the most immediate oil recovery equipment with a crane barge'S operation.