Wärtsilä Launches Efficient New Aframax Tanker Design

Press Release
Monday, October 22, 2012

Wärtsilä, a marine industry's solutions and services provider, has launched a new, highly efficient Aframax tanker design that offers solutions for current and forthcoming emissions legislation.


 
Wärtsilä Ship Design has developed a double hull, single screw crude oil tanker featuring a CFD (Computational Fluid Dynamics) optimised hull to provide less resistance with higher propulsion efficiency. The minimum time at the terminals is ensured by the high loading/discharge rate. The CFD optimisation of the hull form has carefully considered the flow lines and pressure distribution along the hull, while the cylindrical bow accommodates a range of operational draughts even in rough weather conditions.


 
The propulsion system is based upon the high performance, 2-stroke Wärtsilä X62 main engine. This electronically controlled, common-rail engine has an extra long stroke and low rpm. It also has a minimised physical width to allow a slimmer aft body design, which further benefits the propulsion efficiency.


 
Compared to currently available main engine options, the Wärtsilä X62 engine can achieve fuel savings of seven per cent on the specific vessel design. Furthermore, the same vessel speed can be reached using one less cylinder, i.e. six instead of seven cylinders. The seven cylinder version provides even greater efficiencies due to the lower rpm and higher de-rating.


 
For emissions compliance, an integrated Wärtsilä exhaust gas scrubber has been placed on the funnel. Main engine, auxiliary engines and auxiliary boilers are all connected to the integrated scrubber.  The scrubber effectively reduces sulphur oxide (SOx) emissions, and meets the 0.1 percent sulphur limit even with HFO (Heavy Fuel Oil) having a sulphur content of 3.5 per cent. A Wärtsilä SCR (Selective Catalytic Reduction) system has been placed before the turbocharger turbine for the main engine. The SCR is a post combustion nitrogen oxides (NOx) abatement system that permits optimised combustion, in terms of efficiency, while reducing NOx emissions by more than 90 per cent. The abatement equipment is tuned with the main and auxiliary engines for effective operations across the complete load range and IMO Tier III requirements can be fulfilled.


 
"The new realities of the shipping industry call for higher fuel efficiency, lower operating costs, and better environmental performance. The new Wärtsilä Aframax tanker design meets all these criteria, and we are proud to offer this segment the combination of state-of-the-art design and superb propulsion machinery that can produce meaningful savings," says Riku-Pekka Hägg, Vice President Wärtsilä Ship Design.


Wärtsilä X62 engine


The Wärtsilä X62 is the most compact engine in its class of very low-shaft-speed engines. Thanks to the engine's agility, it is the optimum choice for several vessel segments. The Wärtsilä X62 has a cylinder bore of 620 mm and its power output is in the 8,000 to 21,280 kW range. It comes in 4 to 8 cylinder configurations.


Aframax tanker:
Length over all, approx    253.20 m
Beam    44m
Max draught    15.2 m
Carrying capacity                            abt. 117,000t dwt
Net cargo    abt. 134,250m3 in 12 cargo tanks
Loading/discharge rate at the manifold    9000m3/hr
Bow loading system    8000m3/hrs

Maritime Reporter November 2014 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Marine Propulsion

Waterjet-propelled Crewboat Delivered to Petrobras

BS Camburi, a 36-meter Monohull Crewboat built in Brazil by Arpoador Engenharia to the Petrobras type P2 specification has been launched and delivered.   Designed by Incat Crowther,

PIRIOU Delivers 53-meter FSIV

French boat builder PIRIOU has delivered the 11th of its 53- by 10-meter Fast Supply and Intervention Vessels (FSIV) to Suisse Outremer AG, to be operated by ABC Maritime AG.

Becker Marine Delivers Rudder for Largest Containership

Becker Marine Systems delivers rudder for the largest container ship in the world   At 19,000 TEU, the largest container ship in the world is now picking up speed

Tanker Trends

Oil Prices Retreat from Short-covering Rebound

Global crude prices fell more than $1 a barrel on Thursday, retreating from a short-covering charged rally as traders bet the market had not shaken off a six-month long rout on oversupply concerns.

INTERTANKO Launches ECA Bunker Surcharge Clauses

INTERTANKO’s documentary committee has launched bunker surcharge clauses for Emission Control Areas (ECA).   Rising bunker prices due to rising oil prices and

DSME Returns for More Dual-Fuel Engines

MAN Diesel & Turbo received an order for four MAN B&W 5G70ME-GI engines in connection with Daewoo Shipbuilding & Marine Engineering Co.,Ltd. (DSME) agreeing a deal

Environmental

Italian Shipbuilder Pleads Guilty to Environmental Crimes

An Italian shipping firm based in Genoa, Italy, pleaded guilty to violating the Act to Prevent Pollution from Ships by falsifying required ships’ documents to hide

K Line to Expand Use of Eco-efficiency Software

Three further K Line vessels to install ClassNK-NAPA GREEN eco-efficiency software after reporting fuel savings during trials on an 8,600 TEU container vessel   NAPA

LR Supports Chinese Recycling Yards' EU Application

LR’s initial verification of the Ship Recycling Facility Plans for both Zhoushan Changhong International Ship Recycling Co. Ltd. and Jiangyin Xiagang Changjiang

Naval Architecture

Waterjet-propelled Crewboat Delivered to Petrobras

BS Camburi, a 36-meter Monohull Crewboat built in Brazil by Arpoador Engenharia to the Petrobras type P2 specification has been launched and delivered.   Designed by Incat Crowther,

Damen Responds to Evolving Fishing Practices

Maaskant Shipyards Stellendam meets fishing sector’s growing needs by performing electric pulse fishing conversions   As European fishing policies evolve, so fishing techniques advance.

Damen Delivers Survey Vessel to Fugro

Fugro Frontier is the third vessel in a series received by Fugro during 2014   Three months after its last delivery, Fugro has received the third of a series

Vessels

Waterjet-propelled Crewboat Delivered to Petrobras

BS Camburi, a 36-meter Monohull Crewboat built in Brazil by Arpoador Engenharia to the Petrobras type P2 specification has been launched and delivered.   Designed by Incat Crowther,

K Line to Expand Use of Eco-efficiency Software

Three further K Line vessels to install ClassNK-NAPA GREEN eco-efficiency software after reporting fuel savings during trials on an 8,600 TEU container vessel   NAPA

Hoists Facilitate Offshore Crane Repairs

When the diesel engine of a deck crane failed, it caused major handling problems for an offshore platform operating in the Dutch sector of the southern North Sea,

 
 
Maritime Careers / Shipboard Positions Maritime Contracts Maritime Security Naval Architecture Navigation Pod Propulsion Salvage Ship Repair Ship Simulators Shipbuilding / Vessel Construction
rss | archive | history | articles | privacy | terms and conditions | contributors | top maritime news | about us | copyright | maritime magazines
maritime security news | shipbuilding news | maritime industry | shipping news | maritime reporting | workboats news | ship design | maritime business

Time taken: 0.1899 sec (5 req/sec)