ISO 12101:2025 PDF

Industrial valves — Measurement, test and qualification procedures for fugitive emissions — Classification system and qualification procedures for type testing of stem seals for valves

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Title (English):

ISO 12101:2025

Industrial valves — Measurement, test and qualification procedures for fugitive emissions — Classification system and qualification procedures for type testing of stem seals for valves

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 24
Publication date:: June 13, 2025
Edition:: ISO IS 12101 edition 1 version 1
ICS:: 23.060.01

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Description (English):

This document covers the type testing of valve stem seals using a test fixture that is designed and fully defined to be representative of the performance of a valve using similar geometry. This document is applicable to stem seals for multi-turn, linear and quarter turn valves. It is intended to provide comparative type test results confirming the performance of seal manufacturers’ stem seal designs. This document is not intended to replace type testing of complete valve assemblies or valve production testing. Compliance with this document is not intended to be a mandatory qualification test to be completed for a stem seal design prior to testing a valve to the requirements of ISO 15848-1. Compressible seals with and without live loading, elastomers and pressure energized seals are in the scope of this document. Corrosion tests are not included in this document.

Technical details

Technical committee: ISO/TC 153 - Valves
SKU: ISO 12101:2025

Abstract

Overview

ISO 12101:2025 - Industrial valves: type testing of stem seals for fugitive emissions defines a classification system and test procedures for evaluating valve stem seals using a standardized test fixture that reproduces valve-like geometry. The standard applies to multi-turn, linear and quarter-turn valves and covers compressible packings (with and without live loading), elastomers and pressure‑energized seals. It is designed to provide comparative type‑test results for seal manufacturers and test laboratories. Note: ISO 12101:2025 does not replace type testing of complete valve assemblies, is not a mandatory pre‑condition for ISO 15848-1 valve testing, and excludes corrosion tests.

Key topics and technical requirements

Test fixture design: A fully defined test fixture representative of valve geometry (NRRS, RNRS, RRS, QT movement simulations) is required to produce comparative results.
Stem seal types in scope: Compression packings (adjustable and live‑loaded), non‑adjustable spring/pressure‑energized seal stacks, and elastomer seals.
Test facility requirements: Demonstrated capability for required tests, qualified personnel, appropriate equipment, a quality management system (QMS) and health, safety & environment (HSE) controls, and familiarity with pressure and leakage testing and reporting.
Test procedures and parameters:
- Defined test fluids, temperatures and pressures (document references helium and methane in the context of tightness classes).
- Leakage measurement methods and instrumentation to quantify fugitive emissions.
- Mechanical endurance testing (cycle classes) to simulate isolating and control valve stem movements, including full rated travel (stroke/angle).
- Safety rules, equipment calibration and test reporting requirements.
Performance classification: Tightness classes, endurance classes, temperature range and rules for stem seal performance class designation and extension of qualification to untested but related seal designs.
Informative annex: Example test fixture constructions are provided to guide implementation.

Practical applications and users

ISO 12101:2025 is intended for:

Seal manufacturers seeking comparative type‑test qualification of stem seal designs.
Valve manufacturers selecting stem seal systems for compliance with fugitive emission objectives.
Independent test laboratories that perform type testing and issue qualification reports.
End users and asset operators (oil & gas, petrochemical, chemical plants, power generation, environmental compliance teams) assessing valve fugitive emission performance for procurement, maintenance and regulatory reporting.

Benefits include reproducible fugitive emissions testing, informed valve/packing selection, and clearer performance claims for stem seals.

Related standards

ISO 15848-1:2015 - Industrial valves - Measurement, test and qualification procedures for fugitive emissions - Part 1: qualification procedures for type testing of valves (referenced for valve-level testing).

Related standards

Mentioned in the description and other ISO standards

Abstract

Overview

Key topics and technical requirements

Test fixture design: A fully defined test fixture representative of valve geometry (NRRS, RNRS, RRS, QT movement simulations) is required to produce comparative results.
Stem seal types in scope: Compression packings (adjustable and live‑loaded), non‑adjustable spring/pressure‑energized seal stacks, and elastomer seals.
Test facility requirements: Demonstrated capability for required tests, qualified personnel, appropriate equipment, a quality management system (QMS) and health, safety & environment (HSE) controls, and familiarity with pressure and leakage testing and reporting.
Test procedures and parameters:
- Defined test fluids, temperatures and pressures (document references helium and methane in the context of tightness classes).
- Leakage measurement methods and instrumentation to quantify fugitive emissions.
- Mechanical endurance testing (cycle classes) to simulate isolating and control valve stem movements, including full rated travel (stroke/angle).
- Safety rules, equipment calibration and test reporting requirements.
Performance classification: Tightness classes, endurance classes, temperature range and rules for stem seal performance class designation and extension of qualification to untested but related seal designs.
Informative annex: Example test fixture constructions are provided to guide implementation.

Practical applications and users

ISO 12101:2025 is intended for:

Seal manufacturers seeking comparative type‑test qualification of stem seal designs.
Valve manufacturers selecting stem seal systems for compliance with fugitive emission objectives.
Independent test laboratories that perform type testing and issue qualification reports.
End users and asset operators (oil & gas, petrochemical, chemical plants, power generation, environmental compliance teams) assessing valve fugitive emission performance for procurement, maintenance and regulatory reporting.

Benefits include reproducible fugitive emissions testing, informed valve/packing selection, and clearer performance claims for stem seals.

Related standards

ISO 15848-1:2015 - Industrial valves - Measurement, test and qualification procedures for fugitive emissions - Part 1: qualification procedures for type testing of valves (referenced for valve-level testing).

ISO 12101:2025 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Practical applications and users

Related standards

Related standards

Abstract

Overview

Key topics and technical requirements

Practical applications and users

Related standards

Related standards

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