On September 12, 2011 Kherson shipyard and “Concord Shipbuilding” firm put into operation dry-cargo vessel “Alena” of “Volzhskiy” type after significant re-equipment with increased vessel’s general strength, shipping class notation and tonnage. Customer is RIO Maritime Shipping Company. Re-equipment project was designed by the Marine Engineering Bureau (MEB). After re-equipment the vessel has achieved Russian Maritime Register of shipping class notation KM L4 R2-RSN. The re-equipment project base is idea of usage high (3.5 m taking into consideration existing coamings) continuous longitudinal hatch coamings that allow to increase standard of general strength of vessel’s hull (by 56%), cargo holds’ capacity, tonnage in accordance with International Load Lines Convention. Existing coamings and previous upper deck were the most loaded elements that worked out their fatigue resource. These elements were located in the zone near to the neutral axis of the equivalent beam, so they were excluded from the general hull bend that allowed to save them as hull elements. Moment of inertia increase without bottom thickness increase allowed to increase bottom moment of resistance by 42%.
Forecastle height was increased for 1.7 m to improve sailing qualities. Moreover, sides’ shell between decks in aft area was mounted, so full scale poop superstructure was generated.
Vessel’s deadweight was increased from 4350 tons up to 6059 tons (by 1709 tons or by 39.3%), cargo holds’ capacity increased from 6441 cub. m up to 9972 cub. m (by 3531 cub. m or by 54.8%). Main works were made at the shipyard, as follows:
Mounting of the new longitudinal cargo hatch coamings (height increasing of the existing ones by 2.5 m) with new main deck mounting; generation of poop superstructure;forecastle height and length increasing; formation of CO2 station in PS buoyancy compartment in area of fr. 96-106 (for fire extinguishing in cargo holds) with exit trunk to opened main deck.
After re-equipment vessel “Alena” is of cargo double-screw type with 4 cargo holds, with double bottom and double sides, with forecastle and poop, with ER and accommodation superstructure located aft. The dry-cargo vessel is assigned for transportation of the general, bulk, timber, grain and large-sized cargoes, dangerous goods and coal. Vessel’s principal dimensions are as follows:
- Overall length – 138.80 m
- Breadth – 16.50 m
- Depth – 5.50 m
- Draught (river/sea) – 3.60/4.10 m
- Deadweight (river/sea) – 4808/6059 t
- Hold’s number – 4
- Cargo holds capacity – 9972 cub. m
- Ballast tanks capacity – 3082 cub. m
- Ballast draught – 2.68 m
- Hatch covers are of piggy-back type
Re-equipped dry-cargo vessel “Alena” has technical and economic indices that significantly exceed vessel’s ones before re-equipment that allows her to be operated in the conditions of the river-sea going and sea transportations.