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
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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
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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
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 Barge operations for definition of required handling rates and transhipper storage
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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
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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
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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
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 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
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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
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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.
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 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: zebec@zebecmarine.com
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