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Enhanced redundant control system

25 March 2008

Asco Numatics is offering an enhanced version of its SIL3 certified Redundant Control System (RCS) for process valves. The enhanced RCS offers higher flow rates for larger process valve configurations, making it ideal for use across a wide variety of oil and gas, refining, and power generation applications. In addition, the system is third-party certified for use in IEC 61508 SIL 3 applications and has received system approvals for ATEX Zone 1.

“Our RCS solution combines the benefits of safety and reliability in a single package,” said Jean Christophe Serkumian, managing director of Asco Numatics in the UK. “It’s the only pilot valve system that has no single point of failure that can result in an unwanted closure of the process valve. With the RCS, customers will benefit from higher asset availability, less risk of spurious trips, and safe shut downs of mission critical systems, time after time.”

The RCS achieves higher levels of safety by incorporating a redundant, fault-tolerant architecture, high diagnostic coverage, and automated testing. Its self-diagnostic capabilities test both the safety system and process valve to ensure continuous proper operating performance.

The RCS was designed to meet the expanding national and international hazardous location requirements for safety systems, high reliability, and critical control applications. It allows the end-user to specify a normally closed, normally open or double acting configuration in redundant control "2oo2" (two-out-of-two) or single solenoid with back-up "1oo1" (one-out-of-one) operation.

All types of RCS are available with "automatic on-line testing" of the solenoid valves and "partial stroke testing" of the process valve. The RCS also provides users with a maintenance/ by-pass mode, which permits service to the device without taking the process valve off line. This allows the plant to maintain production without jeopardising its safety.

To make it easy for customers to configure their RCS system to suit their exact requirements, Asco has introduced an online product selection tool. Customers can quickly determine the product features required in their application and then can construct a catalogue number. Product attributes, top-level and wiring drawings, and SIL 3 information also are provided.

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