ISO 19230:2020
Gas analysis — Sampling guidelines
This document specifies the general provisions and gives the basic definitions of terms relating to sampling for gas analysis, including sampling devices, sampling methods, sampling technical considerations, and sampling safety.
This document applies to both direct and indirect sampling of gas in pressure receptacles and pipelines, including pure gases and gas mixtures. Compressed and liquefied gases are both considered.
This document applies to the sampling of processed gases and does not involve gas treatment processes.
The sampling procedures specified are not intended for the sampling of special products which are the subject of other International Standards, such as liquefied petroleum gases (see ISO 4257) and gaseous natural gases (see ISO 10715).
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Sampling plan
5 Sampling classification
5.1 Sampling classification of gases
5.2 Sampling classification of liquefied gas
6 Technical specifications
6.1 Overview
6.2 General considerations for gas sampling
6.2.1 Adsorption, reaction and permeation of sampling system
6.2.2 Leaks and atmospheric diffusion in the sampling system
6.2.3 Leak testing of the sampling system
6.2.4 Purging of the sampling system
6.2.5 Homogeneity of gas
6.2.6 Inert-gas purging
6.3 Possible condensation during compressed gas sampling
6.4 Main considerations for liquefied gas sampling
6.5 Samples that are not feasible in containers or cannot be used for analysis directly
7 Safety guidance in sampling
7.1 Overview
7.2 General recommendation
7.3 Specific recommendation for sampling a certain substance
8 Sampling devices
8.1 General provision
8.2 Sample container
8.2.1 Sample container material
8.2.2 Structure of sample container
8.2.3 Volume of sample container
8.3 Sample probe
8.4 Pressure reducer and flow controller
8.5 Sample pump
8.6 Sample line
8.6.1 Material of sample line
8.6.2 Length and diameter of sample line
8.7 Connecters and seals
8.8 Cleaning and drying of the sampling device
8.9 Connection of sampling devices
9 Sampling
9.1 Sampling method block diagram
9.1.1 Overview
9.1.2 Block diagram of compressed gas sampling method
9.1.3 Block diagram of liquefied gas sampling method
9.2 Quality assessment of the sampling system
9.3 Sampling from the gaseous phase and sampling after evaporation of liquefied gas
9.4 Direct sampling
9.4.1 General provisions
9.4.2 Direct sampling of gas in pressure receptacles
9.4.3 Direct sampling of gas in pipelines
9.5 Indirect sampling
9.5.1 Indirect sampling of gas in pressure receptacles
9.5.2 Indirect sampling of gas in pipelines
9.5.3 Leakage test of sample container
9.5.4 Storage of samples
9.6 Sampling records
Annex A (informative) Examples of estimation of the purging time and purging cycles for sampling system
Annex B (informative) Direct sampling for gas in pressure receptacles
Annex C (informative) Direct sampling of gas in pipelines
Annex D (informative) Fill-empty sampling method
Annex E (informative) Evacuated-container sampling
Annex F (informative) Evacuated-system sampling
Annex G (informative) Indirect sampling using floating piston cylinders
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Sampling plan
5 Sampling classification
5.1 Sampling classification of gases
5.2 Sampling classification of liquefied gas
6 Technical specifications
6.1 Overview
6.2 General considerations for gas sampling
6.2.1 Adsorption, reaction and permeation of sampling system
6.2.2 Leaks and atmospheric diffusion in the sampling system
6.2.3 Leak testing of the sampling system
6.2.4 Purging of the sampling system
6.2.5 Homogeneity of gas
6.2.6 Inert-gas purging
6.3 Possible condensation during compressed gas sampling
6.4 Main considerations for liquefied gas sampling
6.5 Samples that are not feasible in containers or cannot be used for analysis directly
7 Safety guidance in sampling
7.1 Overview
7.2 General recommendation
7.3 Specific recommendation for sampling a certain substance
8 Sampling devices
8.1 General provision
8.2 Sample container
8.2.1 Sample container material
8.2.2 Structure of sample container
8.2.3 Volume of sample container
8.3 Sample probe
8.4 Pressure reducer and flow controller
8.5 Sample pump
8.6 Sample line
8.6.1 Material of sample line
8.6.2 Length and diameter of sample line
8.7 Connecters and seals
8.8 Cleaning and drying of the sampling device
8.9 Connection of sampling devices
9 Sampling
9.1 Sampling method block diagram
9.1.1 Overview
9.1.2 Block diagram of compressed gas sampling method
9.1.3 Block diagram of liquefied gas sampling method
9.2 Quality assessment of the sampling system
9.3 Sampling from the gaseous phase and sampling after evaporation of liquefied gas
9.4 Direct sampling
9.4.1 General provisions
9.4.2 Direct sampling of gas in pressure receptacles
9.4.3 Direct sampling of gas in pipelines
9.5 Indirect sampling
9.5.1 Indirect sampling of gas in pressure receptacles
9.5.2 Indirect sampling of gas in pipelines
9.5.3 Leakage test of sample container
9.5.4 Storage of samples
9.6 Sampling records
Annex A (informative) Examples of estimation of the purging time and purging cycles for sampling system
Annex B (informative) Direct sampling for gas in pressure receptacles
Annex C (informative) Direct sampling of gas in pipelines
Annex D (informative) Fill-empty sampling method
Annex E (informative) Evacuated-container sampling
Annex F (informative) Evacuated-system sampling
Annex G (informative) Indirect sampling using floating piston cylinders
Bibliography