BISMARCK, ND (AP) – Iowa regulators have gone beyond their counterparts in North Dakota by requiring owners of the Dakota Access Pipeline to provide expert analysis to back up the company’s claim that doubling the line’s capacity does not increase the potential of a spill. Energy Transfer wants to double the capacity of the pipeline to as much as 1.1 million barrels daily to meet growing demand for oil shipments from North Dakota, and is seeking permission for additional pump stations in the Dakotas, Iowa and Illinois to do it.