VIDALIA (AP) — The owners of a major pipeline will host an open house in Vidalia this month to explain coming significant upgrades to the line. American Midstream Partners announced in October plans to replace the 8-inch pipeline from Winnsboro to Natchez, Mississippi, with a 12-inch pipeline. American Midstream Partners Investor Relations Manager Allysa Howell said Tuesday the company will be contacting landowners and community members this week about the open house. The open house will be April 13 at the Vidalia Conference and Convention Center.