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  1. #1

    I-S-O Std (Natural-Gas)

    pl share the following stds.

    6327
    6570
    10715
    11541
    12213-1
    12213-2
    12213-3
    13443
    15112
    15970
    15971
    18453
    19739
    20765-1
    20765-2
    23874


    See More: I-S-O Std (Natural-Gas)

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  7. #5

    Re: I-S-O Std (Natural-Gas)

    Natural gas — Correlation between water content and water dew point





    1 Scope

    This International Standard specifies a method to provide users with a reliable mathematical relationship between water content and water dew point in natural gas when one of the two is known. The calculation method, developed by GERG; is applicable to both the calculation of the water content and the water dew point.

    This International Standard gives the uncertainty for the correlation but makes no attempt to quantify the measurement uncertainties.



    2 Terms and definitions

    For the purposes of this document, the following terms and definitions apply.

    2.1 correlation
    relationship between two or several random variables within a distribution of two or more random variables

    [ISO 3534-1]

    NOTE The indication of the range of temperature, pressure and composition for which the correlation was validated is given in Clause 3.

    2.2
    working range
    range of parameters for which the correlation has been validated

    2.3
    extended working range
    range of parameters for which the correlation has been developed, but outside the range for which the correlation has been validated

    2.4
    uncertainty of the correlation
    absolute deviation of calculated value from the experimental database

    NOTE This does not include any measurement uncertainty in the field.

    2.5
    acentric factor
    parameter to characterize the acentricity or non-sphericity of a molecule

    NOTE This definition was taken from reference [1] in the Bibliography.




    2.6
    normal reference conditions
    reference conditions of pressure, temperature and humidity (state of saturation) equal to 101,325 kPa and
    273,15 K for the real, dry gas

    [ISO 14532:2001]

    2.6 traceability
    property of the result of a measurement or the value of a standard whereby it can be related to stated references, usually national or international standards, through an unbroken chain of comparisons all having stated uncertainties

    [ISO 14532:2001]



    3 Development of the correlation

    In the past, GERG has identified the necessity for an accurate conversion between the water content and the water dew point for natural gases with sales gas characteristics. To achieve this goal, the GERG defined a research program. In the first phase of the project, reliable data on water content together with data on water dew point were collected for several natural gases for the dew-point temperature range of interest: −15 °C to
    +5 °C and for the (absolute) pressure range of interest: 0,5 MPa to 10 MPa. In addition to the measurements
    on the seven representative natural gases, measurements were also carried out on the key binary system methane/water. The procedure used for gathering the measured data was the saturation method.

    Taking the determined values for the repeatability and reproducibility of the Karl Fischer instrument as consistency criteria for all measured water contents, only a few inconsistent values were detected, which were mainly situated in the range of low water content (high pressure, low temperature range). Values which failed the consistency check were either rejected or, in a few cases, weighted much lower in the data pool. In most cases, these values were replaced by repeated measurements carried out at the same pressure and temperature conditions.

    Detailed information on the experimental procedure and the composition of the natural gases used during the experiments can be found in
    --STACK OVERFLOW ERROR --

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  9. #6

    Re: I-S-O Std (Natural-Gas)

    Natural gas — Correlation between water content and water dew point





    1 Scope

    This International Standard specifies a method to provide users with a reliable mathematical relationship between water content and water dew point in natural gas when one of the two is known. The calculation method, developed by GERG; is applicable to both the calculation of the water content and the water dew point.

    This International Standard gives the uncertainty for the correlation but makes no attempt to quantify the measurement uncertainties.



    2 Terms and definitions

    For the purposes of this document, the following terms and definitions apply.

    2.1 correlation
    relationship between two or several random variables within a distribution of two or more random variables

    [ISO 3534-1]

    NOTE The indication of the range of temperature, pressure and composition for which the correlation was validated is given in Clause 3.

    2.2
    working range
    range of parameters for which the correlation has been validated

    2.3
    extended working range
    range of parameters for which the correlation has been developed, but outside the range for which the correlation has been validated

    2.4
    uncertainty of the correlation
    absolute deviation of calculated value from the experimental database

    NOTE This does not include any measurement uncertainty in the field.

    2.5
    acentric factor
    parameter to characterize the acentricity or non-sphericity of a molecule

    NOTE This definition was taken from reference [1] in the Bibliography.




    2.6
    normal reference conditions
    reference conditions of pressure, temperature and humidity (state of saturation) equal to 101,325 kPa and
    273,15 K for the real, dry gas

    [ISO 14532:2001]

    2.6 traceability
    property of the result of a measurement or the value of a standard whereby it can be related to stated references, usually national or international standards, through an unbroken chain of comparisons all having stated uncertainties

    [ISO 14532:2001]



    3 Development of the correlation

    In the past, GERG has identified the necessity for an accurate conversion between the water content and the water dew point for natural gases with sales gas characteristics. To achieve this goal, the GERG defined a research program. In the first phase of the project, reliable data on water content together with data on water dew point were collected for several natural gases for the dew-point temperature range of interest: −15 °C to
    +5 °C and for the (absolute) pressure range of interest: 0,5 MPa to 10 MPa. In addition to the measurements
    on the seven representative natural gases, measurements were also carried out on the key binary system methane/water. The procedure used for gathering the measured data was the saturation method.

    Taking the determined values for the repeatability and reproducibility of the Karl Fischer instrument as consistency criteria for all measured water contents, only a few inconsistent values were detected, which were mainly situated in the range of low water content (high pressure, low temperature range). Values which failed the consistency check were either rejected or, in a few cases, weighted much lower in the data pool. In most cases, these values were replaced by repeated measurements carried out at the same pressure and temperature conditions.

    Detailed information on the experimental procedure and the composition of the natural gases used during the experiments can be found in
    --STACK OVERFLOW ERROR --

  10. #7

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