First Supercritical Unit Designated Historical Landmark

Issue 9 and Volume 107.

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The American Society of Mechanical Engineers has designated American Electric’s Power’s former Philo Unit 6 an Historic Mechanical Engineering Landmark for numerous groundbreaking technological advances. The125 MW unit, which operated from 1957 to 1975, was the world’s first utility unit to use steam at the supercritical pressure of 4,500 psi — almost twice that of previous units. Technologies introduced at Philo 6 increased by one-third the thermal efficiency of coal-fired generation to 40 percent. Presenting the historical plaque to AEP CEO Linn Draper is Don Zwiep, former president of ASME.

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