UNI EN 12838 : 2003

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Description of a continuous LNG sampling system
5 Description of a discontinuous LNG sampling system
6 Characteristics of the test rig
      6.1 Description of the test rig
      6.2 Measurement required
7 Suitability tests
      7.1 General requirements of test performance
      7.2 Operating procedure
      7.3 Calculation of suitability criteria for the
             tested sampling system
8 Suitability criteria for the LNG sampling system
9 Test report
Annex A (informative) Continuous LNG sampling system
Annex B (informative) Discontinuous LNG sampling system
Annex C (informative) Thermodynamic conditions for the
                      transformation of LNG into natural
                      gas
      C.1 - General remarks
      C.2 - Example of characteristic points
Annex D (normative) Test rig
Annex E (normative) Means required to evaluate the test rig
      E.1 - General remarks
      E.2 - Measuring devices
      E.3 - Layout of measuring devices in test rig
Annex F (normative) Means required to evaluate a continuous
                    LNG sampling system
      F.1 - General remarks
      F.2 - Measuring devices
      F.3 - Layout of measuring devices in the tested
            sampling system
Annex G (normative) Means required to evaluate a
                    discontinuous LNG sampling system
      G.1 - General remarks
      G.2 - Measuring devices
      G.3 - Layout of measuring devices in the tested
            sampling system
Annex H (normative) Method of calculation of the accuracy
                    of the test rig
      H.1 - Mean values of physical properties derived from
            the analysis of the reference gas
      H.2 - Calculation of the relationship of the physical
            property with time of the reference gas
      H.3 - Mean value of a physical property of the
            reference gas
      H.4 - Random error on a value of the reference gas
      H.5 - Random error on all values of the reference gas
      H.6 - Example of calculation
Annex J (normative) Method of calculation of the accuracy of
                    a continuous LNG sampling system
      J.1 - Deviation in relation to reference gas, of the
            physical property X derived from gas analyses
            obtained with the tested sampling system
      J.2 - Random error of the tested sampling system
      J.3 - Systematic error of the tested sampling system
      J.4 - Statistical test on systematic error
      J.5 - Example of calculation
Annex K (normative) Method of calculation of the accuracy of
                    a discontinuous LNG sampling system
      K.1 - Calculation of the regression equation of the
            reference gas
      K.2 - Deviation of physical property X from regression
            equation
      K.3 - Random error of the tested sampling system
      K.4 - Systematic error of the tested sampling system
      K.5 - Statistical test on systematic error
      K.6 - Example of calculation