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to SSG 16
The two sisters at the Dana Fjord roads off Göteborg.
Sister pair delivered to ambitious shipowner
“Stoc Regina” was delivered in July by the Ceksan
Shipyard in Tuzla, Turkey, to its owner, the young Stockholm based shipowning
company Stoc Tankers, a company that plans to have a fleet of six to eight
product tankers in 5–7 years time. “Stoc Petrea”, delivered
in November 2004, and its sister vessel “Stoc Regina” is a pair
of coastal product tankers built and equipped to reduce port turn-around
to a minimum.
Stockholm was once a major tanker centre. This ended when all the major
owners such as Frontline, ICB and NTA were taken over by foreign owners
and moved abroad. With the companies followed much of the tanker operating
competence – but not all. Stoc Tankers was established in 2003 as
a subsidiary of Stockholm Chartering, a shipbroking company that runs
the chartering of a vast fleet of tankers in most sizes as well as being
a sale and purchase and newbuilding broker. Stoc Tankers is the principal
owner of the vessels in which Scanmer, Ramonia Chartering, Engco Invest
and Rederi AB Dagny also own shares. Ramonia Chartering handles the commercial
management, while technical management and crewing lies with a subsidiary
of Stoc Tankers, Crew Chart Ship Management.
Both vessels are engaged on long-term contracts of affreightment for Preem
to distribute petroleum products from the oil company’s refineries
in Göteborg and Brofjorden, also on the Swedish west coast, to the
oil terminals.
Maximum dimensions
The ice-strengthened tanker pair is designed for coastal services primarily
in Scandinavia and the vessels are built with the maximum dimensions to
pass through the locks in the Trollhätte Kanal to Sweden’s largest
lake, Vänern. The 88 metre long and 13 metre wide tankers have a
deadweight of 4,560 tons. Full cargo intake is about 4,000 tons at a draft
of 6.5 metres. When trading on Lake Vänern the maximum draft is 5.4
metres, corresponding to a cargo intake of about 3,000 tons.
When designing the vessel, fast turnaround in the terminals was empathised.
The vessels are designed primarily for unit loading with only one grade
carried at the same time, but up to six grades can be loaded. The cargo
section consists of eleven tanks, all equipped with a Svanehöj Deepwell
pump. The cargo handling capacity is exceptionally high for a tanker of
this size. The discharge capacity is about 1,000 cubic metres per hour
and loading capacity is up to 1,500 cubic metres depending on pipe dimensions.
A full load can be discharged in about five hours.
To maximise reliability, each pump is also connected to the adjacent tank,
making it possible to discharge a tank also if one pump is damaged.
Excellent manoeuvrability
 The
cargo tanks are coated with epoxy paint from Jotun and cleaned by Scanjet
machines. Tank levels are measured by a Saab Tankradar level gauging system.
The propulsion package, including the CP propeller, is of MAN B&W
make. The 2,720 kW main engine provides a speed of 12.5 knots at 85 per
cent MCR. The vessel has been designed to allow a future installation
of a catalytic converter system.
Two 400 kW Volvo Penta diesel generators and a 450 kVA shaft generator
provides electricity.
A high lift rudder and a 350 kW forward mounted fully 360 degree rotational
water jet thruster provides excellent manoeuvrability. The thruster can
also be used for emergency propulsion during a main engine breakdown.
Although not fully integrated, the bridge has been designed
to provide best possible working conditions for the bridge team in demanding
situations such as in heavy trafficked canals. The pilot/co-pilot cockpit
has been placed unsymmetrically. The vessel is manoeuvred from the port
seat and this is placed on the vessels centre line. JRC has supplied most
navigational equipment. The bridge is also equipped with a Transas electronic
chart system.
The accommodation is designed for a crew of eleven, although a crew of
ten today operates the vessel.
Expanding Stoc Tankers has yet a newbuilding to take delivery of. A somewhat
larger product tanker than the Stoc Petrea and Stoc Regina twins has been
ordered from the same shipyard, Ceksan in Turkey, for delivery in April
2007. It will have a different design and a deadweight of about 5,000
tons as well as being somewhat longer, which means that it will not be
deployed in shipping to and from Lake Vänern.
//Rolf P Nilsson
Latest update 18-10-2006 8:49
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No 18/2008
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