DREDGING EQUIPMENT DETAILS :
Dredging depth : 25 m (Dredging pipe angle 45º)
Design capacity of hopper : 4,500 cbm
Maximum load : 6,100 t (density 1.42t/m3) – but subject to deductibles
Dredge Pump : 2 Nos - Single casing centrifugal pump made by IHC Holland – Model No. 123/30/70NWFT
Jet Water Pump : 2 Nos – made by ZHEJIANG FASHION PUMP CO. LTD – Model - OTS-300-560A
Suction Pipe : 2 x 750 mm, 18 mm thick, swell compensated, 3 points hoisting with two sets of dragheads.
Suction Pipe Hoisting : 3 point hoisting with open hydraulic winches
Dumping arrangement : Two rows of 11 sets of hydraulic operated bottom open conical doors. Doors fitted with alarm.
Valve Control : Hydraulic remote operated
Overflow Pipe : Adjustable Overflow pipe – adjustable remote from Bridge. Telescopic hydraulically operated system.
Dredge Control : One man operated from Midship lower position in Wheel House
Drag Head : Single Visor Self Adjustable Universal Drag Head with single fixed jet pipe connection. DN 700, Size of drag head: 2.5m width, 8 mt weight
INSTRUMENTATION :
Modern dredge monitoring and control equipment along with software available for monitoring concentration, velocity, draghead position and various other parameters. Vessel is fitted with Hypack/Dredgepack.
SUITABILITY/ WORKING ASSUMPTIONS :
Ambient Temperature : -15C ~ 40 C
Sea Water temperature : 0C ~ 35C
Humidity : 90% ~ 95% at about 35 deg C
Maximum Current : 2 knots
Max wind speed : Up to Wind of Beaufort Force 5 (17 to 21 knots). However, Master to have the final authority to decide upon the suitability of weather condition with respect to the dredging operations being undertaken.
Max swell : 2.0 mtrs
Minimum u/water clearance : 2.0 mtrs
Able to dredge : Mud, Mud with clay, Medium density mud with sand
Status of Mud at seabed : DN50 = 0.25mm
OTHERS :
Speed : Sea - 9.5 knots
Average laden (dredging) – 8.0 knots
Average empty (dredging) – 9.0 knots
Above in fair weather upto and including wind to Beaufort scale 3 and wave to Douglas Sea State 2
Grade of oil : Marine Gas Oil (MGO)
Quality of bunkers supplied by Charterers to conform to ISO 8217:2005 DMA
Consumption
(Sea stmg./non dredging) : Main Engine – 13.0 mt
1 Generator running : 2.0 mt
Consumption
18 hours steaming
6 hours dredging : Total 14.0 mt
A tolerance limit of +/- 5% is permitted to Owners on all consumptions specified above.
Bow Pusher : Fitted – operated with dredge pump
INSURANCE :
P&I Club – North of England
H&M Value – USD 15 millions
Increased Value – USD 3.75 millions
War Risk Value – USD 18.75 millions
