The pipeline sector has long been an excellent place for income investors because these companies often pay out a large percentage of their cash flow in dividends each year. Because of that, yields tend to be well above average, which is certainly the case with ONEOK (NYSE: OKE), Enbridge (NYSE: ENB), and Phillips 66 Partners (NYSE: PSXP). What’s more, these three companies combine a high current yield with a lower risk profile and visible growth opportunities, which makes them excellent stocks for income-focused investors.