US-based shipyard General Dynamics (GD) Nassco has started construction work on the second American Petroleum ECO tanker at its shipyard in San Diego.
Nassco commenced work on APT-1, the first of five tankers ordered by American Petroleum Tankers (APT), in September.
GD Nassco vice-president and general manager Kevin Graney said: "Nassco is providing our customers with some of the most energy-efficient, fuel-saving and cost-effective tankers in the world.
"The construction of the first tanker for American Petroleum Tankers is well underway at Nassco and we are pleased to begin construction on a second tanker for the company today."
The building of these five tankers is the result of a collaboration between Nassco and American Petroleum to build and operate innovative and increased energy and fuel efficiency products, GD said.
With a deadweight tonnage of 50,000t, the liquefied natural gas (LNG) conversion-ready vessels will each have 330,000 barrel cargo capacities.
The specialised ECO design of the vessel provides better energy-efficiency and also offers environmental protection features, including a ballast water treatment system.
Delivery of all five vessels is expected to be completed by mid-2017.
In June 2013, APT subsidiary Kinder Morgan Energy Partners awarded a design and build contract for four 50,000dwt LNG-conversion-ready product carriers.
In June this year, the company ordered an additional product tanker from Nassco to make the total number of tankers ordered to five.
The contract complies with the Jones Act, which requires that ships carrying cargo in the US are to be built in domestic shipyards.
Image: The construction of APT-2 followied a steel cutting ceremony at Nassco’s San Diego-based shipyard. Photo: courtesy of General Dynamics.