A U.S. decision to reimpose sanctions on Iran is supporting China’s newly established crude oil futures, and may spur efforts to start trading oil in yuan rather than dollars, traders and analysts said.  Since launching in March, Shanghai crude oil futures ISCc1 have seen a steady pick-up in daily trading, while open interest – the number of outstanding longer-term positions and a gauge of institutional interest – has also surged. Traded daily volumes hit a record 250,000 lots last Wednesday, more than double the day before, spurred by news of the Iran sanctions. The jump helped the front-month Shanghai futures contract account for 12 percent of the global oil market last week, up from just 8 […]