Overview
SIST EN ISO 25457:2023 sets internationally recognized requirements and provides essential guidance for the selection, design, specification, operation, and maintenance of flares and related combustion and mechanical components used in pressure-relieving and vapor-depressurizing systems. This standard is key for the oil and gas industries, including lower carbon energy sectors, and is especially relevant for the refinery and petrochemical industries. Developed by CEN and aligned with ISO's global framework, the standard ensures safe and reliable flare operation in both new and existing installations, with a primary focus on onshore facilities but includes guidance for offshore applications.
Key Topics
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Flare System Design and Selection
The standard outlines industry best practices for designing and specifying combustion equipment associated with pressure relief and vapor-depressurizing systems. It emphasizes the importance of selecting appropriate flare technologies to meet required performance, safety, and environmental standards.
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Operational and Maintenance Guidelines
Guidance is provided on the operation and maintenance of flare systems to ensure safe, efficient, and long-term functioning. The document discusses important considerations such as regular inspection, maintenance scheduling, and system troubleshooting.
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Ignition Systems
SIST EN ISO 25457:2023 supplements API 537 and addresses modern ignition systems such as ballistic and pyrotechnical ignition systems. It details requirements for projectile-based flare ignition, including safety, purge procedures, projectile handling, and spent projectile containment.
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Volumetric Flow and Process Data
Specific recommendations are included for the calculation and documentation of volumetric flow rates and other design data critical for flare system configuration and compliance.
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Evaluation of Existing Facilities
While the standard is developed for new installations, it also provides a framework for assessing and upgrading existing flare systems to improve safety and performance.
Applications
The practical value of SIST EN ISO 25457:2023 is broad and supports various activities within the oil and gas, petrochemical, and increasingly, lower carbon energy industries. Typical applications include:
- Design and Construction of Refineries and Petrochemical Plants
Ensures that newly constructed facilities conform to the highest international standards for flare system safety and performance.
- Upgrading and Auditing Existing Flare Installations
Provides benchmarks for evaluating current equipment and implementing upgrades for compliance with evolving industry practices and regulations.
- Equipment Procurement and Specification
Helps engineers, project managers, and procurement professionals select and specify compliant combustion, ignition, and mechanical components.
- Safety and Regulatory Compliance
Supports adherence to safety codes, local regulations, and environmental targets by providing clear, harmonized guidance.
- Communication and Record-Keeping
The inclusion of datasheets and documentation guidelines aids in effective communication between stakeholders and ensures traceability of design decisions.
Related Standards
To deliver maximum value, compliance with SIST EN ISO 25457:2023 should be paired with familiarity with key related standards:
- API Std 537: Flare Details for Petroleum, Petrochemical, and Natural Gas Industries, which SIST EN ISO 25457:2023 supplements.
- EN ISO 25457:2008: The previous edition, now superseded, for reference to legacy requirements.
- Standards on Pressure Relief Equipment: Such as ISO 4126, for comprehensive safety system design.
- Process Equipment Standards: Notably ICS 75.180.20 series for processing equipment.
Implementing SIST EN ISO 25457:2023 demonstrates a commitment to industry-leading flare safety and performance, supporting both operational excellence and environmental goals for energy operators and engineering firms worldwide.
