In 1997, we began a program to construct new generation
OSVs based upon the proprietary designs of our in-house team of naval
architects. Since that time, we have constructed 24
new generation OSVs using these proprietary designs,
and expanded our fleet with the acquisitions of additional new generation OSVs. Our fleet of
48 OSVs is among the youngest fleets in the industry.
We also own and operate two anchor handling/
towing - supply vessels (AHTSV).
Historically, demand for our OSV services
has been primarily driven by the drilling of deep wells, whether
in the deepwater or on the U.S. Continental Shelf, and other
complex exploration and production projects that require specialized
drilling and production equipment. In addition, our new generation
OSVs are increasingly in demand by our customers for conventional
drilling projects because of the ability of our OSVs to reduce
overall offshore logistics costs for the customer through
the vessels' greater capacities and operating efficiencies.
OSVs primarily serve exploratory and developmental drilling rigs and production facilities and support offshore and subsea construction, installation, maintenance, repair and decommissioning activities. OSVs differ from other ships primarily due to their cargo carrying flexibility and capacity. In addition to transporting deck cargo, such as pipe or drummed material and equipment, OSVs also transport liquid mud, potable and drilling water, diesel fuel, dry bulk cement and personnel between shore bases and offshore rigs and production facilities.
Multipurpose Supply Vessles (MPSV)
MPSVs also support the offshore exploration and production activities of the energy industry. MPSVs are distinguished from OSVs in that they are significantly larger and more specialized vessels that are principally used to support complex deepwater subsea construction, installation, maintenance, repair, decommissioning and other sophisticated operations. These vessels are typically equipped with a variety of lifting and deployment systems, including large capacity cranes, winches or reel systems. For example, MPSVs can serve as a platform for the subsea installation of risers, jumpers and umbilicals. MPSVs also support ROV operations, diving activities, well intervention, including live well intervention, platform decommissioning and other complex construction operations.
and Tank Barges
We offer marine transportation, distribution and logistics services primarily in the northeastern United States, the GoM, Great Lakes and Puerto Rico with our Downstream fleet mix of nine double-hulled tank barges, 11 single-hulled tank barges and 16 ocean-going tugs. We provide our services to major integrated oil companies, independent refineries and oil traders. Generally, a tug and tank barge work together as a tow to transport refined or bunker grade petroleum products. Our tank barges carry petroleum products that are typically characterized as either "clean" or "dirty". Clean products are primarily gasoline, home heating oil, diesel fuel and jet fuel. Dirty products are mainly crude oils, residual crudes and feedstocks, heavy fuel oils and asphalts.
Since 2005, we have taken delivery of eight new double-hulled tank barges and eight retrofitted tugs under a series of Downstream newbuild programs. These tank barges added 780,000 barrels of new double-hulled barge capacity and increased our tug brake horsepower to an average of approximately 3,900 per tug, up from an average of approximately 3,100 per tug.