Overview
CEN/TR 17078:2017 - Stationary source emissions: Guidance on the application of EN ISO 16911-1:2013 - is a CEN Technical Report that provides supporting guidance and interpretation for the manual reference method for measuring gas stream velocity and volume flow rate in ducts. It clarifies application options, recommends which requirements and performance characteristics apply for different measurement objectives, and promotes consistent implementation across EU Member States. This Technical Report explicitly does not provide guidance for EN ISO 16911-2:2013 (automated systems).
Key topics and technical requirements
This Technical Report expands on and interprets EN ISO 16911-1 and addresses:
- Scope and concepts for manual determination of duct velocity and volume flow rate.
- Measurement principles: point velocity determination, volume flow from point velocity, tracer dilution and transit-time tracer methods, and plant thermal input approaches (noting these approaches are discussed in the document).
- Selection of monitoring approach based on measurement objective and required uncertainty.
- Measuring equipment and techniques, including differential-pressure methods and S-type Pitot tubes (Annexes detail Pitot equipment and leak checks).
- Measurement procedure: site survey, determination of sampling plane, number of measurement points, pre-test checks (leak checks, repeatability, swirl/cyclonic flow).
- Quality control and post-measurement checks, calculations for mean velocity, wall-effect corrections, conversion to standard conditions.
- Uncertainty assessment: establishment of an uncertainty budget with worked examples (Annex F).
- Informative annexes on swirl determination, leak check methods, and other supporting methods.
Applications and target users
CEN/TR 17078:2017 is intended for professionals and organizations involved in stationary source emissions monitoring and compliance, including:
- Environmental and stack testing engineers performing manual flow and velocity measurements.
- Emissions compliance officers and facility operators subject to the EU Emissions Trading System (EU ETS) and the Industrial Emissions Directive.
- Testing laboratories and consultants preparing measurement plans, reports and uncertainty budgets.
- Regulators and accreditation bodies seeking consistent interpretation of EN ISO 16911-1 across Member States.
Practical uses include planning site surveys, selecting appropriate measurement techniques for ducts and stacks, performing Pitot-based velocity surveys, compiling uncertainty budgets, and ensuring measurements meet regulatory uncertainty requirements.
Related standards
- EN ISO 16911-1:2013 (manual reference method) - primary standard addressed
- EN ISO 16911-2:2013 (automated systems) - not covered by this TR
- EN 14181 (QA of automated measuring systems)
- EN 15259 (requirements for measurement sections and sites)
- ISO 10780 (velocity and flowrate measurement in ducts)
Keywords: CEN/TR 17078, EN ISO 16911-1, stationary source emissions, flow rate measurement, Pitot tube, stack emissions, EU ETS, Industrial Emissions Directive, uncertainty budget.
