Italian Life-Assessment Procedure for Creep-Operated Pressure Equipment

Abstract

Since 1989 ISPESL has emanated dispositions for pressure equipment designed to operate in the creep range according to time dependent mechanical properties. During the years, on the basis of the results of in-field examinations, a series of new provisions has been improved and sharpened the original procedure. During the last two years ISPESL has gone to revise and update the emanated regulations. Now a new entire legislation covers all the subjects and it is set as an advanced means of investigation for equipment working in the creep range: ISPESL technical procedure N. 48/2003. The elaborating of the legislation in matter has benefited from the previous experience, the indications of users and the European and international standards. The procedure is widely applied in Italian plants.

Optimal sensor positioning on pressurized equipment based on Value of Information

“…This has recently resulted in a deep revision of the guidelines, 10,11 making scheduled inspections by Non-Destructive Tests (NDTs) recommended to prevent SSCs creep and failures. 1,[12][13][14] On the other hand, condition monitoring and intelligent analysis of data collected by sensors may help predicting degradation escalation and anticipating the risk of failure. [15][16][17][18][19] In this work, we use the concept of Value of Information (VoI) to find how to optimally position ultrasonic thickness gauges on a pressurized equipment, for largest benefit in terms of reduced costs and increased data accuracy.…”

“…This has recently resulted in a deep revision of the guidelines, 10,11 making scheduled inspections by Non-Destructive Tests (NDTs) recommended to prevent SSCs creep and failures. 1,12–14 On the other hand, condition monitoring and intelligent analysis of data collected by sensors may help predicting degradation escalation and anticipating the risk of failure. 15–19…”