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Natural gas - Determination of composition and...
1 Scope
2 Normative references
3 Terms and definitions
+ 4 Symbols
Table 4‑1 — Symbols
+ 5 Overview
Figure 1 — Gas Analysis Overview
+ 6 Sample
+ 7 Sample introduction
+ 8 Separation
+ 9 Detection
+ 10 Data processing
11 Calibration
+ 12 Optimization
13 Precision and bias
+ 14 Use of control charts (from ISO 6975:1997)
Figure 11 — Example of a control chart for nitr...
Figure 12 — Example of a control chart for carb...
Figure 13 — Example of a control chart for etha...
15 Test Report
+ Annex A
A.1 Application Ranges
Table A.1 — Application Ranges
A.2 Principle
+ A.3 Materials
+ A.4 Apparatus
+ A.5 Procedure
A.6 Example: Single-oven gas-chromatographic sy...
Table A.4 — Configuration of the chromatographi...
Figure A.1 — Typical chromatogram of helium, hy...
Figure A.2 — Typical chromatogram of nitrogen (...
+ Annex B
B.1 Application ranges
Table B.1 — Application ranges
B.2 Principle
+ B.3 Materials
+ B.4 Apparatus
+ B.5 Procedure
+ B.6 Expression of results
B.7 Procedure for setting valve timings and res...
B.8 Final time settings
Table B.4 — Valve configuration timing
+ Annex C
C.1 Application ranges
Table C.1 — Component working ranges
C.2 Principle
Figure C.1 — A typical chromatogram
+ C.3 Materials
+ C.4 Apparatus
C.5 Scheme of the configuration
Figure C.2 — a) Initial configuration: all valv...
Figure C.3— b) Sample injection: V1 to position...
Figure C.4 — c) Backflush C6+: V2 to position 2...
Figure C.5 — d) Isolate N2, C1, CO2, C2; measur...
Figure C.6 — e) Reconnect column 3 - measure N2...
+ C.6 Procedure
+ C.7 Expression of results
+ C.8 Example of application
+ C.9 Procedure for Setting Valve timings and Res...
+ Annex D
D.1 Application ranges
Table D.1 — Component working ranges
+ D.2 Principle
+ D.3 Materials
+ D.4 Apparatus
+ D.5 Procedure
D.6 Calculation
+ Annex E
E.1 Introduction
E.2 Scope
+ E.3 Definitions
E.4 Principle
+ E.5 Analysis and analytical requirements
+ E.6 Procedures
E.7 Calculations
E.8 Annex A (informative) Determination of the ...
E.9 Annex B (informative) Further details on th...
E.10 Annex C (informative) List of retention in...
Table E.2 — Retention indices
+ Annex F
F.1 Introduction
F.2 Measurement of C6+ peak
Figure F.1 — Chromatogram showing C6+ peak
Figure F.2 — Forward flow
Figure F.3 — Backflush of C6+
+ Annex G
G.1 Extract from GPA 2286-95
G.2 Supplementary procedure – extended analysis...

Natural gas - Determination of composition and associated uncertainty by gas chromatography - Part 4: Guidance on gas analysis (ISO/DIS 6974-4:2025)

Oznaka:prEN ISO 6974-4

Odbor:HZN/TO 506

Ime odbora:Materijali, oprema i konstrukcije za naftnu industriju, prirodni plin i geotermalnu vodu

Nacrt objavljen za komentiranje:2025-03-11

Rok za komentiranje:2025-04-05

Broj komentara:0

Contact email:nacrti(at)hzn.hr

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This document gives guidance for obtaining the best analysis results possible from a Gas Chromatograph (GC) when analysing natural gas and natural gas substitutes for combined use with the most recent versions of ISO 6974’s part 1, 2 and 3. (Examples are given.)

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