Pressure safety valve system

Overview

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Pressure safety valves (PSV’s) or Pressure Relief valves (PRVs) are the last line of defence against overpressure events in process systems.

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When a Safety valve requires maintenance, testing, calibration or replacement the isolation & reinstatement procedure must be executed flawlessly, any error can leave the process unprotected against overpressure, with potentially catastrophic consequences.

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The challenge

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Safety Valve isolation & reinstatement involves operating isolation valves in a precise sequence to ensure that pressure protection is maintained throughout the procedure.

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The changeover between on duty and standby Safety valves must be seamless, with no point at which the process is unprotected.

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Human error during this critical procedure can lead to loss of pressure protection, overpressure events and regulatory non-compliance.

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The Alcatraz solution

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Alcatraz provides interlocking solution that mechanically enforces the correct Safety valve isolation valves are isolated and reinstated via a defined sequence, also noted in the global DEP 80.46.30.11-GEN.

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Using our QL-Range and ML-Range interlocks, the isolation valves upstream & downstream of the applicable Safety Valves are linked via a coded key transfer sequence, that ensures the standby PSV is fully online before the On Duty PSV is isolated.

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At no point in the sequence can both Safety valves be simultaneously isolated from the operating process as the mechanical logic prevents this.

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Key benefits

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•   Continuous pressure protection throughout the changeover sequence

•   Mechanical prevention of simultaneous Safety valve isolation

•   Elimination of human error from safety-critical procedures

•   Full compliance with industry DEP standards and regulatory requirements

• Auditable sequence with optional PILOT digital oversight

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Products used

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QL-Range quarter-turn interlocks, ML-Range multi-turn interlocks, PILOT digital oversight, ARVC remote manual valve actuation & Eco-Drive range, Micro-Lock.