VEDAM DESIGN

INDIA | UAE | NETHERLANDS

www.vedamdesign.com

Cost Effective Solution

For Shallow Water

Maintenance Dredging

EADA - 2018

Ankit Ghosh

Naval Architect

OUTLINE

Vedam Background

• Vedam Services

• Track Record

Introduction

• Overview : Indian Dredging scenario

• Requirement of Maintenance Dredging

New Construction

• Shallow Draft Maintenance TSHD

Conversion

• GC to TSHD

• Commercial & Technical Challenges

Conclusion

An ISO 9001-2015 certified.

Offices in India | UAE |

Netherlands.

Experienced Team of 80

Professionals (Naval Architects,

Marine & Electrical Engineers,

Mechanical & Structural

Engineers)

650+ Projects in around 30

Countries.

Brief background

MarineDesign solutions for Seagoing,

Coastal and Inland Vessels.

OffshoreEngineering services for Offshore

Vessels and Platforms.

DredgingInternational Team with Experience of

end-to-end Dredging Solutions.

GasDesign Solution for the Marine

Applications of/for Gas (LNG, CNG,

LPG)

INDUSTRIES

SERVICES

Engineeri

ng &

Analysis

Conversio

n Designs

Concept

& Basic

Designs

Naval

Architectural

Calculations

Site

Supervisi

on

Project

Management

Producti

on

Designs

ProjectShipyard

Location

Scope

Co

nce

pt

Ba

sic

Engg

Equip

Intg

.

Re

tro

fit

Site

Su

pe

rvis

ion

Pro

ject m

ngt

20inch Cutter Suction Dredger, 16m depth India O O O

18inch Cutter Suction Dredger, 14m depth India O O

20inch Cutter Suction Dredger, 20m depth India O

14inch Self Propelled CSD, 6m depth India O

2400CBM TSHD Europe O

Upgradation of 7000CBM TSHDs x 4 India O

Upgradation & Flag change of 2500 CBM TSHD India O

Conversion of General Cargo to TSHD Europe O

90 CBM Shallow water TSHD Middle East O

Conversion of Ore Carrier to Split Hopper Barge India O O O

Track Record

in Dredging

20inch Cutter Suction

Dredger

DREDGE FEATURES Power : 180kw

Maximum speed : 35rpm

PRINCIPAL PARTICULARS

ENGINE INSTALLATION DECK MACHINERY

DREDGE FEATURES Power : 180kw

Maximum speed : 35rpm

PRINCIPAL PARTICULARS

ENGINE INSTALLATION DECK MACHINERY

7

18inch Cutter Suction

Dredger

8

Dredger Details• Length: 82.8 m

• Breadth: 16.0 m

• Loading Capacity:3650 MT

• Hopper Capacity: 2400 CBM

• Dredging Depth: 25 m

• Owner: Dutch

• Type: Trailer

Suction

Hopper Dredger

NEW BUILD-TSHD

Vedam Background

• Vedam Services

• Track Record

Introduction

• Overview : Indian Dredging scenario

• Operational requirement

New Construction

• Shallow Draft Maintenance TSHD

Conversion

• GC to TSHD

• Commercial & Technical Challenges

Conclusion

Introduction

• Boost for infrastructural development of minor ports & inland jetties

• Channels & banks affected by heavy sedimentation.

• Key minor Ports affected by lack of proper breakwaters.

• LAD for the waterways/coastal water fronts has to be maintained at all times for

effective logistics.

• Timely maintenance dredging is a necessity & unavoidable.

Source: IWAI

Dredge Scenario

• In near future, both capital and maintenance dredging will dominate

the market.

• In long run, peak increase in demand for maintenance dredgers for

shallow depth operations.

• Existing Fleet of dredgers mostly cater to requirements of major

ports.

• Shortfall to meet demand for shallow water maintenance dredgers.

Way Ahead?

• Cost Effective Dredgers (CAPEX & OPEX)

• Optimized for Indian Dredging Conditions

• Smaller units, more in numbers, Quick supply

• Better ROI

• Solution:

• ‘Make in India’

• ‘Modify in India’

Ops Requirement

• High Current

• Narrow channel width

• Limited draft

• Air Draft Restrictions

• Dredge depth limited to ~3-14 m

• Training for maintenance engineers/ operators for

the Indian dredge conditions.

• Economically viable (OPEX)

Source: dredgetoday.com

Vedam Background

• Vedam Services

• Track Record

Introduction

• Overview : Indian Dredging scenario

• Operational requirement

New Construction

• Shallow Draft Maintenance TSHD

Conversion

• GC to TSHD

• Commercial & Technical Challenges

Conclusion

New Construction

• Given sufficient time & CAPEX, New

build an easy choice.

• Driven by the conditions prevailing in

the Indian waters, customized solution

can always be provided.

• Low cost, high maneuverability, shallow

depth dredging capability ideal.

CONSTRUCTION: COST WISE BREAK UP

Design

Hull

Marine Sys.

Dredge Sys.

MAIN PARTICULARSLength overall (Ladder raised) 26.5 m

Length of pontoons 17.5 m

Beam 5.2 m

Depth 1.6 m

Draft 1.0 m

DREDGING FEATURESDredging Depth 12 m

Dredge Pump 447 kW

Mixture Capacity 678m3/hr

Production Capacity-Coarse Sand 136 m3/hr

Discharge Length 1500 m

Discharge pipe Diameter 250 mm

Suction pipe Diameter 250 mm

POWER INSTALLED

Total Installed Power(KTA 19M)447 KW @ 1800

RPM

Gear Box 1.96 : 1

HPP + Alternator 100kW

CUTTER FEATURESCutter Power 35 kW

Cutter Diameter 1000 mm

RPM 0-35

LADDER & SWING WINCHES

Ladder Winch60 KN @ 0-20

m/min

Swing winch40 KN @ 0-20

m/min

Swing width @ 45deg 32m

CombiSnijder – 250DM

• Suitable design can be a 90-400 CBM shallow draft TSHD of 25-40m length.

• Can be Twin Screw vessel for easy operation.

• Should be designed for shallow draft dredging.

• Can have provision of shore discharge line or side discharging

New Construction

Vedam Background

• Vedam Services

• Track Record

Introduction

• Overview : Indian Dredging scenario

• Operational requirement

New Construction

• Shallow Draft Maintenance TSHD

Conversion

• GC to TSHD

• Commercial & Technical Challenges

Conclusion

Conversion

• Cost Effective Solution

• Short lead time

• Owners can convert/upgrade existing vessels to meet

requirements

• Ban In mining industry opens up doors to ready availability of

vessels (Goa barges, mini BC ) for conversion.

• Detailed feasibility to choose best suited candidate for

conversion

Conversion

• Fwd Pump Room

• Outbd Buoyancy Compartment*/FO Tanks

• One Suction Arm & Hoisting arrangement

• Bottom Doors/ Discharge outlets

LAYOUT

TYPICAL LAYOUT :

TSHD

Conversion

TYPICAL LAYOUT : GC

•One Big Cargo Hold For Project Cargo

•Wing Tanks as Ballast Tanks

•Fwd Store Room

•ER in AftLAYOUT

Structural Integrity

Dredge Equipment

Ship system & M/C

compartment

• Conversion can split down to following for detailed study.

Conversion

Major Changes

Add. of sloping plates

Bottom Door Access

Minor Changes

Hatch Coamings modification

Additional Stiffening of Hopper Tanks

No Changes

Side Shell Thickness

Bottom Shell Thickness

Conversion

Hopper Tank(New)

Hopper slant plate

Bottom Door

• Split open for discharge

can also be a viable

option.

Conversion

• Know-how on the

mechanism & operation

of the equipment.

• Selection of dredge

equipment as per

needed production rate.

• Ease in integration with

existing hull.

• Category A machinery

space for dredge

engine & supporting

Aux. systems.

• Hydraulic system for

related item is a critical

factor for the design.

Conversion

Hopper Tank (New) Pump room (New)

Gen. room

(New)

LAYOUT POST CONVERSION

Hopper Tank (New) Pump room

(New)

Conversion

Compartments

• Pump room

• Generator Room

• Buoyancy Compartments*

• Additional FO Tanks

Structure

• Sloping plates For Hopper

• Additional Stiffening for Hopper Tanks

• No/Minor Changes in deck house

Machinery

• Additional Generators (2* No. 0f 800-1000 kW) Each

• No/Minor Changes in propulsion

Dredging Equipment

• Dredge/Jet Pumps

• TS Pipes/Drag Head

• Bottom Doors

• Overflow Control System

Project Execution

Dry Cargo Ship Before Conversion

Dry Cargo ship after Conversion to

TSHD

Fitting of inner side shell in

progress

• LBP: 86 m

• Hopper Capacity: 1500 Cub. M

• Bottom Doors : 4 in No.

• Down Time for conversion: 4 Months

• Conversion carried out in Europe

• Life of Converted Dredger: 15-20 Years

• Cost of Conversion: 50%-75% cost effective

Project Execution SPLIT HOPPER BARGE

Conclusion

• Answer to gap in demand: New build or conversion (Where existing

may not fit)

• Cost Effective New build : small size THSD

• Cost effective conversions : Inland SP barges

• Importance has to be given to selection of dredge equipment

31

THANK YOU

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