Overview
ISO/TS 17595:2025 - "Solid biofuels - Characterization of wood chip fuels - Essential information for producers, suppliers and users" is a technical specification from ISO that provides practical guidance for characterizing wood chip fuels. It complements the ISO 17225 series by focusing on quality classes, on-site sampling and test methods for physical properties, and guidance on tests to be carried out by external laboratories. The document is intended to support routine quality monitoring from project planning and start‑up through regular operation. It is explicitly a guidance document and is not intended for demonstrating formal conformance with referenced standards.
Key topics and requirements
- Quality classes and specifications: Guidance on how to interpret and apply graded wood chip classes (linked to ISO 17225-4 and ISO 17225-1) and considerations for raw material classification.
- On‑site sampling and sample preparation: Practical sampling methods, sample handling and preparation tailored for routine plant monitoring.
- On‑site test methods for physical properties:
- Bulk density
- Moisture content
- Particle size distribution and fines fractions
- Heavy extraneous materials
- External laboratory testing: Practical information on laboratory tests commonly needed for energy assessment and compliance:
- Ash content
- Calorific value
- Elemental analysis (C, H, N, S, Cl and ash‑forming elements)
- Operational guidance: Recommendations on type and frequency of testing across planning, commissioning and regular operation; applicability for assessing relative changes in fuel properties when testing routinely.
- Supporting tools and annexes: Empirical formula for net calorific value, model sampling plans, data logging table examples, and key contents expected in laboratory reports.
Practical applications and users
ISO/TS 17595:2025 is aimed at the full supply chain and technical users who need to manage wood chip fuel quality:
- Wood chip producers and suppliers - implement routine on‑site testing and sampling plans to meet buyer expectations and optimize handling.
- Energy facility owners and operators - adapt fuel quality management plans for boilers, gasifiers and CHP systems to reduce downtime and improve combustion performance.
- Equipment manufacturers and system integrators - use fuel characterization data (moisture, particle size, bulk density) to specify feeding systems and combustion equipment.
- Laboratories and quality assurance teams - follow recommended external test approaches and reporting templates.
Typical applications include residential and commercial heating, district heating, light industrial boilers and gasification CHP systems where matching fuel characteristics to conversion technology is critical.
Related standards
- ISO 17225-1 - General requirements for solid biofuels (vocabulary and framework)
- ISO 17225-4 - Graded wood chips (specific fuel quality classes)
- ISO 17225-9 - Graded hog fuel and industrial wood chips
- ISO 16559 - Solid biofuels - Vocabulary
Keywords: ISO/TS 17595:2025, solid biofuels, wood chip fuels, characterization, sampling, moisture content, ash content, particle size distribution, bulk density, calorific value, ISO 17225-4, fuel quality management.