Overview
EN ISO 13577-4:2022 - Industrial furnaces and associated processing equipment - Safety - Part 4: Protective systems (ISO 13577-4:2022) specifies requirements for safety-related control systems used on industrial furnaces and thermoprocessing equipment (TPE). Intended to be used together with ISO 13577‑1, ISO 13577‑2 and ISO 13577‑3, the standard defines design, wiring, software and validation requirements for protective systems used to reduce hazards during operation of TPE. It excludes blast furnaces, converters (steel plants), boilers and fired heaters in petrochemical/chemical industries, upstream electrical/power cabling outside the TPE control panel, and protective systems manufactured before publication.
Key Topics and Requirements
- Scope and integration: Applies to protective systems for industrial furnaces and associated equipment and references functional requirements in ISO 13577‑1/2/3.
- Design methods: Provides three design approaches (Method A, Method BC - a combined version of former Methods B and C - and Method D) to determine risk reduction strategies and architecture for safety-related control systems.
- Fault assessment and wiring: Normative guidance on fault assessment of the wired sections of protective systems and detailed wiring requirements (Annex B) to ensure reliable signal paths and failure detection.
- Failure modes and utilities: Requirements addressing failure of utilities and how such failures affect protective system behaviour and safety outcomes.
- Reset and information for use: Rules for resetting protective systems after trips and required user information/documentation for safe operation (Section 5).
- Software and application requirements: Normative requirements for application software used in protective systems (Annex F).
- Risk levels and SIL/PL determination: Tools and examples (Annexes C, D, E) for determining required Safety Integrity Level (SIL) or Performance Level (PL) using methods such as risk graphs and IEC 61511-based assessments.
- Alignment with functional safety standards: Language and structure harmonized with IEC 62061, IEC 61511 and ISO 13849‑1 to support consistent functional safety practice.
Applications - Who Uses This Standard
- Manufacturers and designers of industrial furnaces and thermoprocessing equipment (TPE)
- Safety engineers and control system integrators implementing protective/safety-related control systems
- Risk assessors and compliance officers performing SIL/PL assignment or IEC 61511 risk assessments
- Quality assurance and certification bodies verifying conformity with EU/CEN and ISO safety requirements
Practical uses include specifying safety architectures, designing wiring and software for protective systems, performing risk assessments to set SIL/PL targets, and preparing operator documentation.
Related Standards (if applicable)
Keywords: ISO 13577-4:2022, industrial furnaces, protective systems, safety, TPE, SIL, PL, risk assessment, IEC 61511, ISO 13849-1, wiring, safety-related control systems.