SIST EN ISO 15848-2:2015 PDF

Overview

EN ISO 15848-2:2015 - Industrial valves: Measurement, test and qualification procedures for fugitive emissions - Part 2: Production acceptance test of valves - defines the production-level test procedures to verify external leakage from valve stems/shafts and body joints of isolating and control valves for use with volatile air pollutants and hazardous fluids. It is the production acceptance complement to ISO 15848-1 (type testing and classification) and was published by CEN in 2015.

Key topics and requirements

• Scope & exclusions: Applies to external leakage of stems/shafts and body seals of isolating and control valves. Excludes end connection joints, vacuum applications, corrosion and radiation effects.
• Sampling: Lot sampling percentage is by agreement between manufacturer and purchaser, with a minimum of one valve per lot selected at random.
• Preconditioning: Valves must be of a design already successfully type-tested according to ISO 15848-1 and conform to relevant production tests prior to this acceptance test.
• Test fluid: Helium with a minimum purity of 97% by volume.
• Leakage measurement: Per the sniffing method defined in ISO 15848-1:2015, Annex B, reported in ppmv.
• Test conditions: Default test pressure 6 bar (unless otherwise agreed) and room temperature as defined in ISO 15848-1.
• Stem/shaft leakage procedure:
  • Half-open valve, pressurize to test pressure, measure by sniffing.
  • Cycle valve (fully open/close) five times under pressure.
  • Half-open and re-measure. If leakage exceeds the agreed tightness class, the valve fails.
• Tightness classes (stem seals):
  • Class A ≤ 50 ppmv
  • Class B ≤ 100 ppmv
  • Class C ≤ 200 ppmv
• Body seal requirement: Measured leakage must be ≤ 50 ppmv (sniffing method).
• Marking & certification: Only valves tested and qualified per ISO 15848-1 and compliant with Part 2 may be marked. Manufacturer shall provide a certificate of compliance if requested.

Practical applications

• Ensures production valves meet specified fugitive emissions limits for environmental, safety and regulatory compliance in petrochemical, oil & gas, chemical processing and other industries handling volatile/hazardous fluids.
• Used during final production inspection, factory acceptance tests (FAT), and supply contracts to verify stem/shaft and body joint tightness before shipping.
• Supports leak-reduction programs, emissions reporting, and alignment with environmental permitting that requires demonstrated control of fugitive emissions.

Who uses this standard

• Valve manufacturers and quality/control engineers conducting production acceptance tests
• Purchasing/specification engineers, procurement teams and end-users who require certified low-emission valves
• Third-party inspection bodies and compliance auditors verifying conformance with fugitive emission requirements

Related standards

• ISO 15848-1:2015 - Classification system and type-testing procedures (required companion document)
• National adoptions: EN ISO 15848-2:2015 (CEN members)

Keywords: EN ISO 15848-2:2015, fugitive emissions, industrial valves, production acceptance test, helium sniffing, stem seal leakage, tightness classes.