Transhipper Design capability
Transcription
Transhipper Design capability
TRANSHIPPERS DESIGN AND PROJECT MANAGEMENT Our team focuses on achieving the right balance in terms of design and operational capability of the transhipper. Conceptual Transhipper Design Design requirements are identified and analyzed after taking into account physical, economic, technological and operational aspects. Based on these, a suitable concept design is prepared along with outline specifications. • Design of material handling system • Transhipper vessel design – Determination of the principle particulars and design concept – Supply, trading and transportation requirements feasibility – Various preliminary rule calculations to ensure Class compliance – Estimation of steel weight – Determination of sea keeping and powering characteristics – Determination of the propulsion / manoeuvring package selection basis: ⁺ Speed specifications ⁺ Quantity and capacity of various machinery ⁺ Equipment package – Preparation of outline Technical Specifications – Preparation of preliminary General Arrangement Plan • Planning and Design – Cranes – Conveyors • Estimation of capital and operating cost • Project viability • Risk analysis Numerical modelling of site conditions to assess operational downtime • • • • • Wave transformation studies – This involves the transformation of waves from offshore to the near-shore areas to assess wave heights at the transhipper operating location. Wave disturbance studies – This involves the estimation of the disturbance due to short waves in the port basin if the transhipper is placed inside the breakwater. Generation of current speeds and directions in the transhipment area Recommendations on positioning transhipper in area with the least wave heights and current strength Estimating the operational downtime Multi-body Simulation • • • • Motion studies of all vessels (transhipper, ocean going vessel, barges) to analyze heave, roll, pitch, surge, sway and yaw motions in varying weather conditions – Transhipper motions – Barge motions – Ocean going vessel (OGV) motions Limiting motions requiring stoppage of cargo transfer operations based on crane limitations, crane operator limitations and contact between vessels Operating downtime of cargo transfer operations for various mooring combinations of OGV, barges and transhipper Modelling of various hull forms (including semi-submersibles) to select suitable hull for project www.zebecmarine.com Barge operations for definition of required handling rates and transhipper storage • • Barging cycle time from and to the nominated port – Prepare simulation model of operations using Extendsim software ⁺ Modelling of barge operations ⁺ Input tidal data if applicable – Assess operating delays and bottlenecks ⁺ Barge cycle times based on random arrival of ocean going vessels ⁺ Barge utilization and fleet size requirements ⁺ Time to unload OGVs and maximum port stay of vessels ⁺ Transhipper utilization ⁺ Requirement of buffer stockpile on transhipper ⁺ Minimum size of stockpile to minimize OGV time in port Barge motion analysis and steaming speed in a seaway to assess non-operating days due to barge unavailability at transhipper – Data to be provided by client ⁺ Barge offset table ⁺ Metocean conditions ⁺ Stability booklet of barges – weight distribution, LCG, VCG, hydrostatics ⁺ Propulsion parameters of barges – Analysis of any adverse heave, roll and pitch motions (sea-keeping analysis & added resistance due to wave conditions) with seas from bow, stern, quarter and beam seas ⁺ Assessment of non-operating days due to adverse barge motions ⁺ Speed calculations based on propulsion power of barges for assessment of cycle times ⁺ Speed reduction in foul weather conditions causing delays in barge cycles – Analysis of green seas on deck in a seaway for assessment of barge design suitability ⁺ Analysis of seawater on deck during foul weather conditions ⁺ Assessment of the requirement of greenwater protection for increased operability of barges Anchoring and Mooring of Transhippers • Mooring options for stationing transhipper at location – Either OGV anchored and transhipper moored to OGV using mooring lines OR Transhipper anchored and OGV moored to transhipper using mooring lines ⁺ Assess anchor loads due to varying weather conditions, Assess limiting weather conditions for STS operations, Assess options of using specialized anchors and cables to increase limiting weather conditions ⁺ Assess mooring line loads, Assess limiting weather conditions for STS operations, Assess options of using higher strength mooring lines to increase limiting weather conditions Financial viability analysis of transhipper deployment • • • Assess capital and operating costs of proposed transhipper Assess minimum tariffs for project viability based on projected annual volumes Comparison against alternative transportation chains to understand project risks and continuity of demand for transhipper www.zebecmarine.com Ship-to-ship manoeuvring simulation The purpose of simulation is to identify and mitigate the risks for the mariner manoeuvring the OGV alongside the transhipper, or manoeuvring the transhipper alongside the OGV. • Modelling of port environments – Software will be used to model the transhipper anchoring position which includes depths, any predefined channel alignment and position of navigational buoys, if any. • Modelling of vessels – Modelling of various sizes of OGVs and barges – Modelling of transhippers • • Simulations – Our ship captains with years of experience in handling of various types of vessels will manoeuvre the selected vessel models alongside the transhipper or vice-versa multiple times. The operational limits will be defined, which permit the vessel to manoeuvre safely with or without tug assistance, and also allow sufficient controlling options for unforeseen circumstances. – Site environment conditions such as currents and winds can be varied as per the range of conditions that may be encountered at the site. The limiting weather conditions for safe vessel arrival and departure can be defined. – The runs can be subsequently replayed and analyzed. We can then recommend modifications to the vessel approaches based on the outcome of the simulations, and the simulations can be re-run in the revised layout. Training of pilots – Pilots can be familiarized with the manoeuvring operations using the vessel models in varying environmental conditions prior direct exposure to the real-world scenario. Detailed Design of transhipper • • • • • • • • • • • • • • Hull form design and optimization Detailed technical specifications Finalized General Arrangement Hydrostatics & stability calculations Main scantling computations Structural design Equipment selection Machinery design Electrical design Safety and navigation Material Handling Structural design of cranes, pedestals Design of conveyors Design of Ship-loaders Transhipper upgradation work executed in China Selection of secondhand vessels for conversion to a transhipper Conversion of older tonnage to a transhipper requires structural design analysis of the vessel hull using Finite Element Analysis (FEA) techniques. Extended life-spans with minimal maintenance downtimes are possible by calculating steel renewals at the conversion stage itself. The suitability of the vessel can be assessed after conducting a cost-benefit analysis of the upgradation work required. www.zebecmarine.com Selected Experience (Transhipper related projects) Year/ Location Project Type Project Details 2011 – Africa Iron ore transhipment in Guinea Bissau 2011 – India Design of transhipper for imports of coal to proposed power plant in India 2011 - Indonesia Design of a coal transhipper in Indonesia 2010 - India Operability of a selfunloading vessel for transhipment into barges 2010 – India & China Upgradation of the material handling system of a transhipper 2005 - India Detailed condition assessment and life extension study of a transhipper Technical feasibility and detailed project report for upgradation of a transhipment vessel Conversion of a 145,000 dwt bulk carrier to a transhipper 2005 - India 2005 – India & China Planning of seaport for transfer vessels on Rio Geba Selection of transfer vessel size based on annual volumes and dredging costs Planning of transhipper transfer rates Analysis of transportation costs & cost-benefit analysis of using a transhipper instead of direct loading of ocean going vessels Planning and managing river surveys and selection of optimum barge size for lowest transportation costs Design of transhipper with material handling system to unload cape size vessels Study of anchor loads and mooring loads during ship-to-ship operations Motion analysis of transhipper, ocean going vessels and barges Assessment of capital and operating costs of transhipment operations, as well as landed costs per ton Design of barge jetty and material handling system Planning and design of cranes, conveyors and shiploader for unloading barges and loading large ocean going vessels Selection of vessel size, and arrangement of equipment on vessel Analysis of operations and throughput achievable with selected equipment Estimation of capital and operating costs of transhipper Assessment of tariffs chargeable to ensure project viability Assessment of anchor loads of a self-unloading bulk carrier with barges secured to the vessel with varying wave, wind and current conditions Assessment of maximum vessel motions of the self unloading vessel and barges – roll, pitch, heave, sway, surge, yaw Assessment of loads on the mooring lines securing the barges to the self-unloading vessel Assessment of operational downtime due to adverse weather conditions Preparation of procedures for de-commissioning of existing crane and installation of a new crane Co-ordination of work to be carried out by crane suppliers, shipyard and class Supervision of installation work of cranes, gantries, generators and conveyors in shipyard Detailed condition assessment, vibration assessment and fatigue analysis of hull, material handling systems, propulsion system Assessment of costs for upgradation and maintenance to assess costbenefit analysis of life extension Detailed study / design for conversion of existing transshipment vessel with new Material Handling System Comparison of various cranes available in the market and selection of most suitable cranes for the vessel Design and engineering for ship materials and equipment Service engineering after deployment Contact us or Email us for your queries; India ‐ Tel no: +91‐22‐ E‐mail: [email protected] www.zebecmarine.com