ISO 24678-1:2019

Overview

ISO 24678-1:2019, titled Fire Safety Engineering – Requirements Governing Algebraic Formulae – Part 1: General Requirements, is an international standard developed by ISO Technical Committee ISO/TC 92, Subcommittee SC 4. This document establishes a comprehensive framework of requirements for the application of explicit algebraic formulae sets used in the calculation of fire phenomena. It provides a structured template addressing key aspects such as description of fire phenomena, calculation processes, limitations, input parameters, and domain of applicability.

The standard serves as a vital implementation of the general provisions defined in ISO 16730-1, specifically tailored to fire dynamics calculations involving algebraic formulae. Fire safety engineers, regulatory authorities, code enforcers, and safety practitioners utilize this document to ensure accuracy, reliability, and consistency in fire safety engineering calculations.

Key Topics

• Description of Physical Phenomena
  The standard mandates clear identification of fire phenomena considered in calculations, ensuring that all relevant characteristics and scenario elements are included. It highlights the importance of acknowledging interactions between complex fire phenomena such as thermo-physical and chemical processes.

• Calculation Process Requirements
  ISO 24678-1 requires detailed documentation of the calculation methods, including:

  • Selection criteria for choosing an appropriate formula or method
  • Presentation of formulae with clear input/output descriptions
  • Definition of variables with SI units
  • Scientific basis supported by peer-reviewed literature or recognized references
  • Practical examples demonstrating formula application

• Limitations and Constraints
  The standard emphasizes defining both quantitative and qualitative limits on the use of algebraic formulae. It also addresses constraints when these formulae are applied within numerical methods to prevent misuse and inaccuracies.

• Input Parameters
  Identification, sourcing, and validation of input parameters are fundamental requirements. The standard insists on providing valid input ranges as per ISO 16730-1 and ensuring consistency with other aspects of fire hazard and risk assessment.

• Domain of Applicability
  ISO 24678-1 requires establishing the domain of applicability of formula sets through comparison with high-quality experimental data or other qualified sources. It promotes transparency about the levels of repeatability and reproducibility supporting the reliability of formulae in specific fire scenarios.

Applications

This standard is widely applicable in fire safety engineering practice, particularly for:

• Fire Safety Design
  Assisting engineers in developing fire-safe built environments-including buildings, ships, and vehicles-by allowing rapid assessment of fire phenomena through validated algebraic formulae.

• Scenario Analysis
  Facilitating quick evaluation and comparison of fire safety design options to meet performance criteria before advancing to detailed numerical simulations.

• Regulatory Compliance and Verification
  Ensuring jurisdictional authorities and code developers utilize standardized calculation methods for fire safety verification aligned with international best practices.

• Educational and Research Use
  Providing a clear framework for academics and practitioners to understand the proper application and limitations of algebraic formulae in fire dynamics.

Related Standards

ISO 24678-1:2019 is part of a broader Global Fire Safety Engineering Analysis and Information System supported by related ISO standards, including:

• ISO 16730-1 – Procedures for verification and validation of calculation methods in fire safety engineering
• ISO 16733-1 – Selection of design fire scenarios and design fires
• ISO 23932-1 – General principles of fire safety engineering
• ISO 16734, 16735, 16736, 16737 – Requirements governing algebraic equations for specific fire dynamics such as fire plumes, smoke layers, ceiling jet flows, and vent flows
• ISO/TS 24679 – Performance of structures in fire
• ISO/TS 29761 – Selection of occupant behavioral scenarios

These interconnected standards provide a robust framework for fire safety professionals to conduct thorough, scientifically-based fire safety assessments using standardized engineering methods.

Keywords: fire safety engineering, ISO 24678-1, algebraic formulae, fire phenomena calculation, fire dynamics, fire safety design, fire risk assessment, fire engineering standards, fire scenario analysis, numerical fire modeling, input parameters, domain of applicability.