EN ISO 12213-2:2009 PDF

Natural gas - Calculation of compression factor - Part 2: Calculation using molar-composition analysis (ISO 12213-2:2006)

Title (English):

EN ISO 12213-2:2009

Natural gas - Calculation of compression factor - Part 2: Calculation using molar-composition analysis (ISO 12213-2:2006)

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 39
Publication date:: September 9, 2009
Edition:: CEN EN 12213 edition 2 version 1
ICS:: 75.060

Document language:

enru

Delivery time:1–7 days

Price:89 €

Description (English):

ISO 12213 specifies methods for the calculation of compression factors of natural gases, natural gases containing a synthetic admixture and similar mixtures at conditions under which the mixture can exist only as a gas. It is divided into three parts: this part, ISO 12213-2:2006, specifies a method for the calculation of compression factors when the detailed composition of the gas by mole fractions is known, together with the relevant pressures and temperatures. The method is applicable to pipeline quality gases within the ranges of pressure p and temperature T at which transmission and distribution operations normally take place, with an uncertainty of about +/- 0,1 %. It can be applied, with greater uncertainty, to wider ranges of gas composition, pressure and temperature.

Technical details

Technical committee: CEN/TC 238 - Test gases, test pressures and categories of appliances
SKU: EN ISO 12213-2:2009

Abstract

Overview

EN ISO 12213-2:2009 (identical to ISO 12213-2:2006) defines a standardized method for calculation of the compression factor (z‑factor) of natural gas using a detailed molar‑composition analysis. The method is intended for single‑phase gaseous mixtures (pipeline quality gas) and uses the AGA8‑92DC extended virial‑type equation to compute z from pressure, temperature and mole fractions. Typical uncertainty for pipeline quality gas is about ±0.1%.

Key topics and requirements

Methodology
- Uses the AGA8‑92DC equation (extended virial form) to determine z by solving the molar density and z simultaneously.
- Numerical solution required - the standard includes guidance and subroutines (Annexes B and F).
Input variables
- Absolute pressure and temperature.
- Molar composition (mole fractions) of components such as N2, CO2, Ar, CH4, C2H6, C3H8, n‑C4, i‑C4, n‑C5, i‑C5, C6, C7, C8+, H2, CO, H2S, He, O2 and H2O.
- All components with mole fraction > 0.00005 must be represented; sum of mole fractions must equal unity to within 0.0001.
Ranges of application
- Pipeline quality: 0 to 12 MPa, 263 K to 338 K; relative density 0.55–0.80; calorific value 30–45 MJ·m−3.
- Wider tested ranges (greater uncertainty): up to 65 MPa, 225 K to 350 K, relative density up to 0.90.
Uncertainty
- ≈ ±0.1% for pipeline quality gases within the specified ranges (validated against GERG and GRI data).
- Uncertainty increases outside these limits (see Annex E).
Normative content
- Annexes include symbols/units, detailed AGA8 description, worked examples, conversion factors, performance over wider ranges, and example Fortran subroutines.

Practical applications and users

Who uses it:
- Pipeline and transmission operators, gas metering and custody‑transfer teams, energy traders, gas laboratories, gas network modelers, and software developers implementing thermophysical property libraries.
Typical applications:
- Accurate z‑factor (real gas factor) calculation for flow metering, custody transfer and billing.
- Pipeline hydraulic modeling and capacity studies.
- Conversion between volumetric and molar/fiscal quantities, energy accounting and quality control.
- Integration into commercial gas property and billing software using the AGA8‑92DC algorithm.

Related standards

ISO 12213‑1 - Introduction and guidelines to compression factor calculations.
ISO 6976 - Calculation of calorific values, density and Wobbe index from composition.
AGA Report No. 8 - Source description of the AGA8 detailed characterization equation.

Keywords: EN ISO 12213-2:2009, compression factor, natural gas, z‑factor calculation, AGA8‑92DC, molar composition, pipeline quality gas, gas metering.

Related standards

Standards mentioned in the description

Abstract

Overview

Key topics and requirements

Methodology
- Uses the AGA8‑92DC equation (extended virial form) to determine z by solving the molar density and z simultaneously.
- Numerical solution required - the standard includes guidance and subroutines (Annexes B and F).
Input variables
- Absolute pressure and temperature.
- Molar composition (mole fractions) of components such as N2, CO2, Ar, CH4, C2H6, C3H8, n‑C4, i‑C4, n‑C5, i‑C5, C6, C7, C8+, H2, CO, H2S, He, O2 and H2O.
- All components with mole fraction > 0.00005 must be represented; sum of mole fractions must equal unity to within 0.0001.
Ranges of application
- Pipeline quality: 0 to 12 MPa, 263 K to 338 K; relative density 0.55–0.80; calorific value 30–45 MJ·m−3.
- Wider tested ranges (greater uncertainty): up to 65 MPa, 225 K to 350 K, relative density up to 0.90.
Uncertainty
- ≈ ±0.1% for pipeline quality gases within the specified ranges (validated against GERG and GRI data).
- Uncertainty increases outside these limits (see Annex E).
Normative content
- Annexes include symbols/units, detailed AGA8 description, worked examples, conversion factors, performance over wider ranges, and example Fortran subroutines.

Practical applications and users

Who uses it:
- Pipeline and transmission operators, gas metering and custody‑transfer teams, energy traders, gas laboratories, gas network modelers, and software developers implementing thermophysical property libraries.
Typical applications:
- Accurate z‑factor (real gas factor) calculation for flow metering, custody transfer and billing.
- Pipeline hydraulic modeling and capacity studies.
- Conversion between volumetric and molar/fiscal quantities, energy accounting and quality control.
- Integration into commercial gas property and billing software using the AGA8‑92DC algorithm.

Related standards

ISO 12213‑1 - Introduction and guidelines to compression factor calculations.
ISO 6976 - Calculation of calorific values, density and Wobbe index from composition.
AGA Report No. 8 - Source description of the AGA8 detailed characterization equation.

Keywords: EN ISO 12213-2:2009, compression factor, natural gas, z‑factor calculation, AGA8‑92DC, molar composition, pipeline quality gas, gas metering.

EN ISO 12213-2:2009 PDF

Technical details

Abstract

Overview

Key topics and requirements

Practical applications and users

Related standards

Related standards

Abstract

Overview

Key topics and requirements

Practical applications and users

Related standards

Related standards

Natural gas — Calculation of compression factor — Part 2: Calculation using molar-composition analysis

Natural gas - Calculation of compression factor - Part 1: Introduction and guidelines (ISO 12213-1:2006)

Natural gas - Calculation of calorific values, density, relative density and Wobbe indices from composition (…