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ISO/NP 20765-4 Natural gas — Calculation of thermodynamic properties — Part 4: Gross characterisation method for fluid phase properties

Source:
ISO
Committee:
PTI/15 - Natural Gas and Gas Analysis
Categories:
Information management | Standardization. General rules
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Scope

The method calculates volumetric and caloric properties of natural gases, manufactured fuel gases, and similar mixtures, at conditions where the mixture is in the homogeneous (single-phase) fluid state. Properties such as hydrocarbon dew point are unlikely to be calculated accurately.

Purpose

This part specifies a method to calculate thermodynamic properties at a known temperature and pressure, from a knowledge of two properties (gross calorific value and relative density are recommended) and the mole fraction of carbon dioxide. The method is also applicable to gases containing hydrogen and in such cases the mole fraction of hydrogen must also be known.

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