Four GPA 688SC PSVs for Brazilian Operator Starnav are under construction and will operate under contract for Petrobras.
GPA 688SC PSV / PETROBRAS PSV 4500
To fulfil Petrobras’ requirements for the 4500 PSV, GPA developed a modern look vessel, the GPA 688SC PSV, with a special deckhouse arrangement. This design has the capability to be transformed into the PSV 3000 (GPA 675 PSV), another vessel specified by Petrobras, by changing the midbody section. This characteristic is extremely valuable for the shipyard as it offers a high degree of flexibility and gives the opportunity to build in series.
The GPA 688SC PSV, measuring 90.00 meters in overall length, has a deadweightcapacity of 4500 MT, thus the designation of the vessel. The vessel’s mechanical and cargo systems meet PETROBRAS requirements for four segregated liquid cargo systems with independent exclusive tanks, piping systems and cargo pumps. All of them are controlled by a fully automatic cargo management system and are capable of carrying synthetic oil-based mud (1,160 m³, Segregation 1), hydrocarbonated oil-based mud (290 m³, Segregation 2), water-based mud (590 m³, Segregation 3), and brine (1,494 m³, Segregation 4). In addition, the vessels are equipped with tanks capable of carrying fresh water (172m3), dry bulk (340 m3), ship’s fuel oil (261m3), ship’s fuel oil day (38m3), fuel oil overflow (55m3), lube oil (4.5m3), dirty oil (13.6 m3), oily water (13.6 m3), sewage (13.4 m3), as well as ship’s ballast (2,060m3).
The vessels will be optimally equipped for all conditions with a diesel-electric propulsion system, consisting of MTU engines, propulsors by Schottel and the Integrated Engine Control Room (ECR) by EPD.
Running on four MTU generators rated for 1,845 kW and one MTU emergency generator rated for 176 kW, GPA sees several benefits for the operator as these generators provide a powerful and compact, robust and quiet solution. They also offer the highest cost-effectiveness and profitability due to low consumption values, long maintenance intervals, and a low-maintenance engine design.
This propulsion configuration is optimized by combining it with two azimuthing drives combi drives rated for 2,500 kW and two tunnel thrusters rated for 900 kW delivered by SCHOTTEL.
The Engine Control Room (ECR) provided by EPD is a completely pre-tested, pre-manufactured container and designed as an integral art of the ship’s structure. It allows for the equipment to be installed and tested in a controlled environment. During construction, the ECR is simply lowered onto the vessel, secured and connected to power and control cables externally. This proven approach, first brought to market in 2009 on the GPA-designed Bourbon Liberties offshore vessel, greatly reduces the possibility of equipment damage while in shipyard.
The GPA 688 PSVs, providing accommodations for 30 crew members, will bear the class notation ABS, +DPS-2, +A1, Offshore Support Vessel, Circle E, +AMS and +ACCU.