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Agip Petroli - Sannazzaro de' Burgondi, Italy. 1995 FCC Turnaround

PhotoReport
Machine setup [view a full-size image] 67Kb Jpg file
Valve body drilling [view a full-size image] 61Kb Jpg file
New guides bolting [view a full-size image] 45Kb Jpg file
Valve internals [view a full-size image] 57Kb Jpg file

PROBLEM: The two-port diverter valve XZ-5851 (slide type, hot wall design, SA240 Tp 304H) operating in the FCC unit at Sannazzaro de' Burgondi refinery had been manufactured by a company which was not on the valve market anymore. This circumstance had caused several problems for lack of technical assistance and availability of spare parts. AGIP, then, contacted Remosa for the supply of internal parts such as seating rings, stem, supporting rings, bolts, lip seals and disc. In addition, AGIP requested to overhaul the valve and to replace all the existing internal parts.

Wear plate machining in a two-port diverter valve

From the previous turnaround, there was evidence of an average of 40% broken internal bolts. Moreover, the clearance between disc and seating ring was excessive.

SOLUTION: The new internal parts were semi-manufactured and finished only after removing the old parts from the valve and precisely measuring them. In the meantime, Remosa had studied, designed and manufactured a portable machine tool for taking the internal bolts out without damaging the threaded hole. The same portable machine tool was later used as a milling machine to prepare the fixing surfaces of the seating rings on the valve body. The valve was overhauled in ten days, working on two 10-hour shifts.

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