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.

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