Offshore tug from Canadian designer
‘Seaways 20’, designed in Canada, built in Singapore
A multi-purpose tug and offshore support vessel, 'Seaways 20', designed by Robert Allan Ltd of Vancouver, and built by Keppel Singmarine, has been delivered to owner Seaways International of Singapore.
This is the latest of the Robert Allan RAmpage series of offshore support tugs which were initially conceived to fill a gap in the offshore market for high-performance, multi-functional tugs for towing, anchor-handling and other offshore support duties.
The propulsion machinery comprises a pair of MaK GM 25C diesel engines; each rated 2,970kW at 750rpm and each driving a Schottel SRP 3030 Z-drive with a 3,400mm diameter CP propeller. This combination delivered a bollard pull of more than 100 tonnes on trials. A free running speed of 14.4 knots was also achieved. The vessel is equipped with a DP2 system. Manoeuvrability is enhanced by CP bow thrusters, Schottel model STT2 FP, electric motor driven, rated at 500kW.
Known as the ‘Swiss Army Knife’ of tugs, the vessel is designed to perform:
- offshore long range towing
- handling/positioning of heavy tankers at FPSO or offshore mooring production buoys
- anchor handling operations
- hose handling at SBM/CALM Buoys, FPSO, etc.
- diving support
- ROV support
- offshore personnel transfer
- safety or standby support
- rescue and salvage towing operations
- oil spill response
- off-ship fire fighting operations
- delivery of cargo to offshore drilling and production rigs that can include containers, various type of deck cargo, fuel oil, drilling water and potable water
Seaways 20 has been built and classed to American Bureau of Shipping notations:
+ A1 Towing Service, AH/Offshore Support, DPS-2, Fire-Fighting Vessel Class 1 with waterspray, Oil Recovery Vessel Class 1 +AMS, +ACCU, Green Passport, ENVIRO+
Principal Particulars are:
- length oa 55.0m
- breadth, moulded 15.0m
- depth, moulded 7.33m
- load line draught 6.35m
- deadweight at loadline draught 1,075dwt
Capacities are:
- fuel oil 590m³
- potable water 120m³
- fire-fighting foam 27m³
- oil dispersant 32m³
- recovered oil (flashpoint < 60°C) 255m³
- drill water 310m³
- deck cargo 200tonnes
- cargo deck area 200m²
In order to accomplish the owner’s goal of reducing environmental footprint, the Seaways 20 has been assigned a Green Passport and ENVIRO+ notation by ABS. The vessel will implement required procedures to deal with ballast water, sewage, and garbage management. In addition:
- it is constructed of environmentally friendly materials
- ballast tanks are constructed to minimise accumulation of sediment
- there is no fuel oil against the skin of the vessel
- approved oily bilge separators are in place
- the ballast and cargo tanks are segregated
- the vessel’s anti-fouling paint is biocide free
- diesel engines are designed to meet international and domestic emissions standards
- the firefighting systems do not contain halon or fluorocarbons
Seaways 20 is equipped with a fi-fi1 system supplied by Jason Engineering and comprising two fire pumps, each rated 1,600m³/h and driven by the main engines through front PTOs. There are two combination water/foam monitors, each rated 1,200m³/hour, as well as a complete deluge system. A 27m³ foam tank is served by two electrically driven foam pumps. Electrical power is generated by two shaft alternators; DSG 86 KI-4W each with a capacity of 1,500kVA at 690V and 50Hz; three diesel gensets- Cat C18 rated 275kW each, 380V, 50Hz; and one emergency genset- Cat C9 rated 143kW, 380V, 50Hz. The forward hydraulic anchor windlass/towing/ship assist winch has a side-to-side configuration with a rated maximum pull of 90tonnes and brake holding of250 tonnes. The aft hydraulic anchor handling/towing winch is a waterfall configuration with a rated maximum pull of 200tonnes and brake holding power of 350tonnes. The vessel is equipped with a large deck crane which has a 30.5m maximum outreach.
The RAmpage class tugs are designed to be hard-working and reliable, able to maintain station in extreme ocean conditions, with enhanced manoeuvring and sea-keeping capabilities.
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Unless otherwise stated, all images copyright © Mercator Media 2012. This does not exclude the owner's assertion of copyright over the material.
