Energy Transfer Partners LP (ETP) unitholders have voted to approve a merger with Sunoco Logistics Partners LP. ETP said 88% of its units voted in favor of the deal, which is expected to close on Friday (April 28). Sunoco said in November it would acquire ETP in an all-stock deal valued at nearly $20 billion to create the nation's second largest midstream master limited partnership by enterprise value. The combined company is keeping the ETP name. The deal comes about five years after ETP acquired Sunoco Inc. in a $5.3 billion deal.