Oil is flooding into U.S. storage tanks at an unprecedented rate, leading traders to wonder how long the hub in Cushing, Oklahoma, can keep absorbing its share of the global supply glut. About half the surplus crude accumulating in tanks across the United States is flowing into Cushing. If the build-up continues at the same rate, some industry officials and sources said, the tanks could reach maximum capacity by early April. Others suggest the flow might continue until July before it tests the limits of the dozens of steel-hulled storage tanks clustered in mid-Oklahoma. Traders have been scrambling to secure space at Cushing so they can store oil purchased at current low prices and sell it in a year at a profit exceeding $11 a barrel because the oil market has been in a structure known as contango. In January, crude oil arriving by pipeline […]