ISO 19694-5:2023

Overview

ISO 19694-5:2023 - "Stationary source emissions - Determination of greenhouse gas emissions in energy‑intensive industries - Part 5: Lime industry" - provides a harmonized methodology for calculating greenhouse gas (GHG) emissions specifically for the lime industry. It covers lime manufacture and downstream lime products (e.g., ground or hydrated lime) and supports reporting at plant, company (by country or region) or international-organization levels. The standard integrates process emissions from carbonate calcination and combustion emissions from kiln and non‑kiln fuels, plus energy‑related indirect emissions (imported electricity, heat or steam), and gives methods to ensure accuracy, precision and reproducibility of GHG inventories.

Key topics and technical requirements

• Scope of emissions: Direct process emissions (calcination and organic carbon in kiln stone), combustion emissions from kiln fuels and non‑kiln fuels, on‑site power generation, and energy indirect emissions (imported electricity/heat/steam). Guidance on imported kiln stone and third‑party transport is included.
• Calculation methods: Two principal approaches are defined - the mass‑balance‑based method and the stack‑measurement‑based method - for determining direct CO2 and other GHGs.
• Activity data and emission factors: Requirements for identifying activity data (fuel use, kiln stone inputs, electricity consumption) and selecting appropriate emission factors for fossil, mixed and biogenic fuels.
• Inventory boundaries: Guidance on organizational, reporting and physical boundaries to distinguish plant vs company vs regional reporting.
• Monitoring plan and documentation: Minimum content and monitoring‑plan requirements to support consistent GHG accounting (see Annex B).
• Uncertainty and verification: Procedures for uncertainty assessment of mass‑balance and stack‑measurement methods, and requirements for verification/certification to improve credibility.
• Performance assessment and reporting: Defined reporting data set and performance indicators for transparency and comparability.

Applications and users

ISO 19694-5 is intended for:

• Lime plant operators, environmental and sustainability managers compiling GHG inventories.
• Regulatory bodies and policymakers needing standardized sectoral emissions data.
• Third‑party auditors, verifiers and certification bodies assessing compliance.
• Consultants and industry associations supporting emissions reduction, carbon management, benchmarking and corporate or regulatory reporting. Practical uses include national emissions reporting, corporate sustainability disclosures, permitting support, carbon‑management planning and cross‑plant benchmarking.

Related standards

• ISO 19694-1:2021 - General aspects for energy‑intensive industries (required companion document).
• ISO 14064-1:2018 - Principles and requirements for GHG inventories (definitions and scopes).
• Other referenced standards: ISO 13909 (coal sampling) and ISO 18283 (coal and coke manual sampling) where fuel sampling is relevant.

Keywords: ISO 19694-5, lime industry, greenhouse gas emissions, GHG inventory, calcination, kiln fuels, mass-balance, stack measurement, ISO 14064-1, emissions reporting.