Parameters Affecting Selection of Dredge Equipment EADA - 2017 RAKESH ROY COO, Naval Architect VEDAM DESIGN & TECHNICAL CONSULTANCY PVT. LTD. 504-506, Acropolis, Military Road, Marol, Andheri (E), Mumbai-59, INDIA +91 22 6108 8686, +91 22 6710 9192 vedam@vedamindia.com, www.vedamdesign.com
OUTLINE VEDAM Background Parameters for Dredger Selection Effect of parameters on Design Versatality of dredgers CSD Series - CombiSnijder
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Concept Basic Engg Equip Intg. Retrofit Site Supervision Project mngt Track Record in Dredging Project Shipyard Location Scope 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 90CBM Shallow Draft TSHD Middle East O
20inch Cutter Suction Dredger PRINCIPAL PARTICULARS DREDGE FEATURES Power : 180kw DREDGE FEATURES ENGINE Power INSTALLATION : 180kw DECK MACHINERY
18inch Cutter Suction Dredger
Few decades ago.. Choices were few, selection was simple!!
A decade after.. Few brands, few segments. Selection involved only basic car specs!! Price Utility Mileage or Fuel Efficiency Max Speed
Last decade.. Many options for a given budget and utility. Selection is a complex process of evaluation! Multiple Brands Techno-commercial evaluation Advance technical Specifications Engine CC Multiple Segments Engine Power / Torque Acceleration / Deceleration rates Gadgets & safety features Maintenance cost. Price Multiple Models within a segment
Present scenario.. Customer wants more in a single investment.. Brands offer VERSATILITY!! Cross-overs, Fusion models (Sedan+SUV, MUV+SUV) Multiple drive modes (Eco, Terrain, City, Desert, Snow..)
Dredger Selection CAPEX Dredging Depth Discharge pipe dia or Pump Capacity OPEX (efficiency, maintenance) Production Curve @ diff. dredge material, pipe length Operational Profile (Capital or maintenance) Mobility Versatility
Importance of Production Curve Why production curve? Individual max. values may misrepresent the actual performance Actual parameters for dredging can be different Production curve gives fair idea of expected production at duty point Production Curve reflects effect of combination of Excavation capacity Acquisition efficiency Transportation range
Excavation Cutter Performance & Characteristic Suction Pipe Selection Net Positive Suction Head (NPSH)
Cutter Performance & Characteristics Determines the production Depends on cutter diameter, RPM and type and number of blades Hard Rock Soft rock Cemented Sand Sand & Loose Soils Clay
Suction Pipe Selection Range of solid material particle size Decides efficient excavation system
Net Positive Suction Head (NPSH) Type of pump (Deck mounted / Surface Mounted / Submerged) Higher NPSH results in cavitation thereby loss in efficiency
Head (m) Transportation Range System Curves for different discharge lengths Discharge Height Discharge Distance (range) 120.00 100.00 80.00 60.00 40.00 20.00 0.00 600.0 700.0 800.0 900.0 1000.0 1100.0 1200.0 1300.0 Production (cu.m)
Acquisition efficiency Pump Curve or Characteristic Engine G/B matching
Best Efficiency Point
Duty Point
Pump Characteristic
Power in kw Engine & Pump performance curve 600 500 Engine supply power 400 300 200 100 Pump Demand Power for different discharge lengths 100% MCR 0 800 1000 1200 1400 1600 1800 2000 2200 RPM
Selection Process of Pump
P-L Drawing Data Insufficient
Versatility of Dredger Range of application other than design point Modularization & ease of upgradation Auxiliary equipment Booster Pump, spud carrier, Spud tilting, 3 & 5-point anchoring system, Side offloading arm Anchor Booms Self-propulsion
Versatility
Versatility
Versatility Pump in Series When head is too High Can be used when larger discharge length is required Barge Offload In case of very large distance disposal
CombiSnijder - Series Model No. 250-SE 250-SM 250-DM 350-SM 350-DM 450 500 Main Particulars Length Pontoon, m 14 14 17.5 19 19 25 28.5 Breadth, m 5.2 5.2 5.2 5.8 5.8 8.5 8.2 Depth, m 1.6 1.6 1.6 1.8 1.8 2.5 2.5 Draught, m 1 1 1.0 1.1 1.1 1.5 1.5 Dredging Features Dredging Depth, m 6 6 12 6 12 14 14-16 Dredge Pump, kw 230 347 347 566 566 620 1007 Mixture Capacity, m 3 /hr (SG-1.24) 583 678 678 1500 1500 2650 - Production Capacity-Coarse Sand, m 3 /hr 117 136 136 300 300 450 500 Pipeline Length, m 1500 1500 1500 1500 1500 1500 2000 Discharge pipe Diameter, mm 250 250 250 350 350 450 500 Cutter Features Cutter Power, kw 35 35 35 85 85-187 Cutter Diameter, mm 1000 1000 1000 1000 1000 1000 1550 RPM 0-35 0-35 0-35 0-35 0-35 0-35 0-34 Engine Main Engine, kw 335 447 447 746 746 625 1007 Auxiliary, kw NA NA NA NA NA 320 447
CombiSnijder - Series Highlights: Cost Effective Simplistic design for specific application Usage of local equipment as far as practical Modular design Upgrades: Increment/Decrement in dredge depth Side discharge arm 3 & 5 point anchoring system Spud Carrier Anchor boom Dk mounted add. gen-set/hppu Dredging automation
CombiSnijder 250DM MAIN PARTICULARS Length overall (Ladder raised) Length of pontoons Beam Depth Draft DREDGING FEATURES Dredging Depth Dredge Pump Mixture Capacity Production Capacity-Coarse Sand Discharge Length Discharge pipe Diameter Suction pipe Diameter 26.5 m 17.5 m 5.2 m 1.6 m 1.0 m 12 m 447 kw 678m 3 /hr 136 m 3 /hr 1500 m 250 mm 250 mm POWER INSTALLED Total Installed Power(KTA 19M) 447 KW @ 1800 RPM Gear Box 1.96 : 1 HPP + Alternator 100kW CUTTER FEATURES Cutter Power 35 kw Cutter Diameter 1000 mm RPM 0-35 LADDER & SWING WINCHES Ladder Winch 60 KN @ 0-20 m/min Swing winch 40 KN @ 0-20 m/min Swing width @ 45deg 32m
CombiSnijder 350SM MAIN PARTICULARS Length overall (Ladder raised) Length of pontoons Beam Depth Draft DREDGING FEATURES Dredging Depth Dredge Pump Mixture Capacity Production Capacity-Coarse Sand Discharge Length Discharge pipe Diameter Suction pipe Diameter 26.5 m 19.0 m 5.8 m 1.8 m 1.1 m 06 m 566 KW 1500 m 3 /hr 300 m 3 /hr 1500 m 350 mm 350 mm POWER INSTALLED Total Installed Power(KTA 38M) 746 KW @ 1800 RPM Gear Box 2.48 : 1 HPP + Alternator 180kW CUTTER FEATURES Cutter Power 85 kw Cutter Diameter 1000 mm RPM 0-35 LADDER & SWING WINCHES Ladder Winch 60 KN @ 0-20 m/min Swing winch 50 KN @ 0-20 m/min Swing width @ 45deg 32m
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