ISO 15848-1 Butterfly Valves
What ISO 15848-1 requires for butterfly valves — applicability, key and testing requirements, the alternative standards, and compliant supply with full certification.
What does ISO 15848-1 require for butterfly valves?
ISO 15848-1 (Industrial Valves - Measurement, Test and Qualification Procedures for Fugitive Emissions - Part 1, International Organization for Standardization (ISO)) sets the design, material and testing requirements for butterfly valves in its scope. ISO 15848-1 specifies measurement, test, and qualification procedures for fugitive emissions from industrial valves. It defines tightness classification classes (A, B, and C) and endurance classes for valve stem seals, providing a standardised basis for fugitive emissions qualification across European and global valve procurement.
Applicable Pressure Classes
Key Requirements
- Tightness Class A: ≤1×10⁻⁴ mg/(s·m) - tightest class for LDAR programmes and EU BREF BAT compliance
- Tightness Class B: ≤5×10⁻⁴ mg/(s·m) - intermediate class for most EU industrial valve specs
- Tightness Class C: ≤5×10⁻³ mg/(s·m) - standard class for general service
- Endurance Class CO1: 210 mechanical cycles; CO2: 2,500 cycles for regular cycling service
- Temperature Classes: Class I (−29°C to 200°C); Class II (to 400°C); Class III (−196°C to 540°C)
- Test fluid: helium gas at rated temperature class pressure
Testing Requirements
- Helium leak test at rated class temperature and pressure
- Minimum 210 mechanical cycles (CO1) or 2,500 cycles (CO2) before qualification
- Tightness measurement using mass spectrometry or equivalent helium leak detector
Alternative Standards for Butterfly Valves
Other standards that also govern butterfly valves — useful for spec cross-acceptance.
Connected Engineering
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