It can be extremely tempting to chase high yields in the master limited partnership space, but income investors would do well to check for sustainability under the hood before buying in. Today we're exploring the wide world of petroleum transportation MLPs to identify three quick and easy ways the top MLPs distinguish themselves from the pack.

In the slide show below, we'll look at how MLPs like Oiltanking Partners (UNKNOWN:OILT.DL), Buckeye Partners (NYSE:BPL)Magellan Midstream Partners (NYSE:MMP) and others fare when it comes to their credit rating, distribution coverage, and debt-to-adjusted EBITDA ratios. Your next stock idea is waiting.