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Problems & Solutions

• Reconditioning of a flue gas double disc slide valve Ø48"

This valve - not made by Remosa - showed many cracks in the welded zones, due to different thickness of body and bonnets. The client had planned the construction of a new valve, but urgently needed a complete reconditioning of the old one, to shorten the (costly) plant stoppage. [read more]

• Heavy gas leakage for a flue gas double disc slide valve Ø103"

This valve had been designed and manufactured (by a competing company) to regulate the gas pressure out of the regenerator of the FCC unit at the Petronor's Somorrostro refinery. An excessive gas leakage, estimated at 10-15% of total gas flow rate, was experienced with the valve fully closed. This problem would cause an energy loss in the expander unit. After Remosa's intervention, gas leakage was reduced to around 1%. [read more]

• Collapsed trim in a flue gas double disc slide valve

A failure to regulate the differential pressure in the regenerator was experienced for a few days at the RPC refinery at ConCón, Chile. Remosa was called in, and in less than 24 hours a field mechanical engineer was at work on-site. The flue gas double disc slide valve - originally manufactured by an US company - was disassembled, to discover that the trim had collapsed. The reason for this was the inadequate size of the bolts fixing the trim to the seating ring. Severe distortion problems were also discovered, and Remosa ended up replacing most of the internal parts. After this successful emergency intervention, RPC awarded Remosa an order for a complete set of new internal parts. [read more]

• New electro-hydraulic actuators needed

Time to go for the low pressure hydraulic actuator and the manual actuator installed on a flue gas double disc slide valve at the Manaus refinery. Remosa presented Petrobras a feasibility study to modify the valve and won a contract for a complete valve overhaul. [read more]

• Repairing five valves without removing them from the line

Esso Italiana (Exxon Group) had experienced numerous problems with these five valves at the Augusta refinery. Remosa designed and manufactured some special machine tools which allowed to work inside the valve body on site. [read more]

• Manufacturer gone, serious trouble for a two-port diverter valve

The two-port diverter valve at Sannazzaro de' Burgondi AGIP refinery had been manufactured by a company which was no longer on the market. This had caused several problems for lack of technical assistance and availability of spare parts, before Remosa's intervention. [read more]

• Valve failure due to design faults

The FCC "B" at YPF La Plata refinery was about to be shut down for a serious problem with a valve stem. Remosa was called in to retrofit and modify four slide valves (from a competing manufacturer). [read more]

• Overhauling five slide valves, hot wall design

This 1994 YPF La Plata turnaround proved one more time how a well planned intervention can obtain the expected results. New internal parts were manufactured at the Remosa plant in Italy and finished on site, at a Remosa qualified workshop. [read more]

• Overhauling four slide valves and replacing their internal parts

These valves were still the welded body type, and welded to the line. Remosa sent to Saudi Arabia a maintenance team with two containers loaded with all the required equipment, including fixed and portable machine tools. [read more]

Copyright © REMOSA spa 1998-2001 Last updated on June 29, 1999