Overview
ISO/TS 16922:2022 - Natural gas - Odorization provides specifications and practical guidelines for the safe odorization of natural gas and other methane‑rich gases delivered through gas networks. The Technical Specification covers principles and techniques for adding odorants, handling and storage of odorants, installation design, and control of odorization to ensure distributed gas is readily detectable by smell for safety purposes.
Key topics and requirements
- Scope and safety objective: Odorization is treated as a primary safety measure so gas can be detected by smell before reaching hazardous concentrations (typical target: detectability at 20% of the lower flammability limit (LFL); LFL of natural gas commonly 4–5% by volume in air).
- Odorant selection: Consider odour character, physical properties (freezing/boiling point, vapour pressure), stability (oxidation, storage), toxicity, environmental impact, compatibility with odorization technique, and network materials (carbon steel, plastics).
- Behavioral issues: Guidance on masking (other gas constituents reducing odour) and fading (adsorption, absorption, chemical loss across the network), and mitigation measures such as preconditioning or supplemental odorization.
- Odorization techniques: Descriptions of common practices including liquid injection, evaporation odorizers, bypass systems, and positioning of injectors for transmission and distribution pipelines.
- Installation and equipment: Design requirements for odorization rooms, ventilation, injection pipework, tank design, pressure resistance and spill kit provisions; compatible sealing materials for liquid odorants.
- Control and monitoring: Procedures for controlling odorant addition, monitoring devices, testing and commissioning, routine checks of odorization systems, and management of odour complaints.
- Safety and handling: Handling, transportation, storage, spill management and remediation of odorants with emphasis on preventing hazardous reactions and environmental release.
- Public awareness: Recommendations for public information programs (e.g., scratch‑and‑sniff cards) and communicating changes in odour character.
Applications
ISO/TS 16922:2022 is applied to:
- Gas transmission and distribution network design and operation
- Odorant supplier specifications and safe storage/handling procedures
- Commissioning and maintenance of odorizers and injection systems
- Safety and emergency response planning for utilities and contractors
- Regulatory compliance and safety audits for gas utilities
Who should use this standard
- Gas network operators and utility engineers
- Safety managers and compliance officers
- Pipeline designers and installation contractors
- Odorant manufacturers and chemical suppliers
- Regulators and certification bodies
Related standards
- ISO 13734 - general requirements and physical/chemical properties of commonly used odorants
- ISO 5492 - Sensory analysis - Vocabulary
- ISO 14532 - Natural gas - Vocabulary
ISO/TS 16922:2022 is essential for ensuring consistent, safe odorization practices across natural gas networks and supporting public safety and regulatory compliance.