HOUSTON--(BUSINESS WIRE)--Plains All American Pipeline, L.P. (NYSE:PAA) today announced that it has closed the previously announced sale of approximately 61 million units of a newly authorized series of 8% perpetual Series A Convertible Preferred Units (the “Preferred Units”) at a price of $26.25 per unit. The Preferred Units will pay quarterly distributions at an annual rate of $2.10 per unit.…