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Normas ASTM – AENOR
ASTM D4784-93(2015)

ASTM D4784-93(2015)

Standard Specification for LNG Density Calculation Models

Fecha:
2016-12-27 /Active
Abstract:

This specification covers LNG density calculation models for use in the calculation or prediction of the densities of saturated liquefied natural gas (LNG) mixtures at a specified temperature range given the pressure, temperature, and composition of the mixture. Composition restrictions for the LNGs are given for methane, nitrogen, n-butane, i-butane, and pentanes. It is assumed that hydrocarbons with carbon numbers of six or greater are not present in the LNG solution. The mathematical models presented here are the extended corresponding states model, hard sphere model, revised Klosek and McKinley model, and the cell model.

Significance and Use:

2.1 The models in this specification can be used to calculate the density of saturated liquid natural gas in the temperature range 90 to 120K. The estimated uncertainty for the density calculations is ±0.1 %. The restrictions on composition of the liquefied natural gas are:

methane

60 % or greater

nitrogen

less than 4 %

n-butane

less than 4 %

i-butane

less than 4 %

pentanes

less than 2 %

It is assumed that hydrocarbons with carbon numbers of six or greater are not present in the LNG solution.

Scope:

1.1 This specification covers LNG density calculation models2 for use in the calculation or prediction of the densities of saturated LNG mixtures from 90 to 120K to within 0.1 % of true values given the pressure, temperature, and composition of the mixture.

1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

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