The last external tank (designated ET-138) scheduled to fly on a shuttle mission was completed on June 25 at NASA’s Michoud Assembly Facility near New Orleans. ET-138 will travel on a 900-mile sea journey to NASA’s Kennedy Space Center in Florida, where it will support shuttle Endeavour’s STS-134 launch.
Taller than a 15-story building and more than 27 feet in diameter, the external tank feeds 145,000 gallons of liquid oxygen and 390,000 gallons of liquid hydrogen to the main engines. The three main components of the external tank include a liquid oxygen tank, liquid hydrogen tank and a collar-like intertank. The intertank connects the two propellant tanks, houses instrumentation and processing equipment, and provides the attachment structure for the solid rocket boosters.
When ET-138 arrives at KSC, it will be mated to shuttle Endeavour and solid rocket boosters for the STS-134 mission, scheduled to launch no earlier than mid-November 2010.
To read more about the mission, visit the NASA website at https://www.nasa.gov/topics/shuttle_station/features/et138_rollout.html.