August 2021

Maintenance and Reliability

Continuous monitoring of creep in equipment

In this article, the development of a customized program—designed by the author and used at Raffineria di Milazzo—for the continuous monitoring of creep in vessels and piping is explained.

D’Antonio, F., Raffineria di Milazzo

In this article, the development of a customized program—designed by the author and used at Raffineria di Milazzo—for the continuous monitoring of creep in vessels and piping is explained. The program extracts temperature data for each piece of equipment from the distributed control system (DCS) and calculates the equivalent creep hours according to equations derived from creep parameters introduced by researchers, such as the Larson-Miller parameter (LMP), the Manson-Haferd parameter (MHP) and the Orr-Sherby-Dorn parameter (OSDP). What is creep? All refineries face material creep, a phenomenon that is seen when the operating temperature exceeds limits—which is typical for steel and alloy

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