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EST Plant (Eni Slurry Technology) consists of about 300 pressure vessels in the following principal units and section: * EST unit (unit 90); * Hydrogen production plant (Unit 95); * SWS sulphur recovery and tail gas treatment (Unit 92 and 94). More than 100 "critical" equipments exist in the EST complex, divided in units and sections on the basis of their type of service. In detail, the considered critical items include: carbon steel and low alloy steels heavy wall pressure vessels for high temperature, high-pressure hydrogen service; carbon steel pressure vessels in sour (wet H^S service) and amine service. For fabrication of such "critical" items special base materials and filler metals were adopted according to specific material requirement, special welding processes and fabrication sequences (including advanced automatic systems for non destrucutive testing) were used. This paper shows an overview on some critical aspects and experience of fabrication of main "critical" equipments of EST Plant. [ABSTRACT FROM AUTHOR]

In the recent past, reheat cracking phenomena have been shown in 2.25 Cr 1Mo 1/4V weld metal of heavy wall pressure vessels. For monitoring these phenomena, chemical and mechanical methods have been developed: Glow Discharge Mass Spectrometry method, which gave Kf para-meter, and Gleeble® thermo-mechanical test, performed at low strain rate. Depending on a few Gleeble® test parameters, the test results couldn't be obtained in laboratories other than Industeel Research Centre. To overcome this limit, European Mini JIP project started in early 2010. This paper describes these two test methods developed for monitoring these phenomena and giving a Mini JIP project achievement report. [ABSTRACT FROM AUTHOR]