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Modernization of tankers with installation of double bottom
In accordance with MARPOL 73/78 convention, that fully entered into force on 01 Jan 2008:
By now we have the unique situation — the majority of river-sea tankers does have double hull and double bottom, but nevertheless are non-compliant with reg. 21 of MARPOL 73/78 for the carriage of oil and oil products of density of 0,900 mt/cbm and are not eligible for the carriage of such cargoes.
The river-sea double-bottom tanker concept was brought up in 1950s, therefore almost all tankers were built with double bottom and double hull. The international requirements for double hull were adopted much later, therefore the double bottom height of major part of domestic tankers is less than required by reg. 19 of MARPOL 73/78.
Domestic river-sea tankers mostly belong to the following projects (build at Soviet and Bulgarian shipyards):
Compliance with the double bottom height regulations of MARPOL convention of river-sea tankers and tankers with restricted area of operation of Lenaneft project.
|Type and project||Double bottom height, mm.||Conclusion|
|At double hull||В ДП||Required by MARPOL|
|Lenaneft, 621, 621.1||1000||800||987||Non-compliant|
|Lenaneft, 630, 630.1||1000||800||1100||Non-compliant|
The possible long-term solutions under consideration:
Some possible solutions were developed taking into account these principles:
Modernization of oil tankers “Tiksi” and “Yana” as per MARPOL 73/78 regulations.
The modernization including installation of double bottom plating was ordered by the ship owner and performed by our company in dry dock and at repair berth of Sevastopol shipyard.
Photo 1. MV Yana sailing from dry dock, MV Tiksi at the shipyard berth
|Photo 2||Photo 3|
|Photo 4||Photo 5|
|Photo 6||Photo 7|
Installation of double bottom plating
Due to the vessels’ hull construction — corrugated bulkheads — the steel plates were cut and replaced. The stripping pipelines and tank shutters were moved to the level above the double bottom plating.
|Photo 8. Tank shutter before the double bottom plating installation||Photo 9. Tank shutter before the double bottom plating installation|
|Photo 10. Stripping pipeline before the double bottom plating installation||Photo 11. Stripping pipeline before the double bottom plating installation|
|Photo 12. Steel plates cut from the corrugated bulkhead||Photo 13. Steel plates cut from the corrugated bulkhead|
|Photo 14. New steel plates||Photo 15. New steel plates|
|Photo 16. Pipes cut to fit the raised bottom level||Photo 17. Construction of the double bottom plating|
|Photo 18. Construction of the double bottom plating||Photo 19. Construction of the double bottom plating|
|Photo 20. Construction of the double bottom plating||Photo 21. Construction of the double bottom plating|
Cross section of Lenaneft-type tanker (project P77) before (a) and after (b) modernization as per project RST006
The following equipment was installed during modernization:
Midship section plan of MT Tiksi after modernization.
During the process of modernization the repair works on vessels’ hulls and equipment were performed with installation of new machinery and presentation to Class surveyors.
|Photo 22||Photo 23|
|Photo 24||Photo 25|
|Photo 26||Photo 27|
|Photo 28||Photo 29|
Modernization of MT Tiksi (ex Palflot-1, project P77) and MT Tiksi (ex Palflot-1, project P77) was performed by our company.
Both tankers were under full operation of Trans-Service Maritime Agency during the whole modernization period from February until end of June 2014.
Beside the general modernization (upgrading of double bottom plating to comply with MARPOL regulations) the following machinery and equipment was repaired: main and auxiliary engines, generators, power plants and automation systems, cargo and supply pumps, auxiliary mechanisms, radio, lifesaving and navigating equipment.
Several kilometers of cargo pipelines as well as ballast, air, stripping and general pipelines were repaired and replaced on both vessels.
The vessels were dry-docked with extraction and repairs of tail shafts, rudders and fittings. Upon completion of modernization the vessels were surveyed by RS Class inspectors for compliance with ISM, ISPS, MLC Conventions.
The vessels sailed from Sevastopol (MT Tiksi on 15 June and MT Yana on 19 June) heading for Rostov-on-Don. Then both tankers will be going through the inland waterways of Russia to their operation region in the Lena river (port Tiksi) as a part of program of supply of fuel to Yakutia. The vessels are manned by crews from Sevastopol and Nakhodka.
General information (Russian):