There have been 20 master limited partnership IPOs this year, and it is as diverse a group as ever. Competing against the likes of CVR Refining (CVRR) and Northern Tier Energy (NYSE: NTI), it is another variable-rate MLP that takes the crown as the best-performing member of 2013's brand-new MLPs. In this video, Fool.com contributor Aimee Duffy talks to Tyler Crowe about Emerge Energy Services (NYSE: EMES), which has returned an outstanding 124% since its IPO in May.