NF EN ISO 6570 : 2005

Foreword
Introduction
1 Scope
2 Normative references
3 Principle
4 Apparatus requirements
  4.1 Measurement installation
  4.2 Check for correct installation operation
5 Sampling
  5.1 General
  5.2 Sampling conditions
  5.3 Sample line
  5.4 Direct sampling
  5.5 Indirect sampling
6 Procedure
  6.1 Determination of potential hydrocarbon liquid content
  6.2 Determination of water formation
7 Expression of results
  7.1 Method A - Manual weighing method
  7.2 Method B - Indirect automatic method
8 Uncertainty of measurement
  8.1 Achievable uncertainty
  8.2 Gas leakage
  8.3 Bath liquid
  8.4 Wet gas
  8.5 Condensate leakage
  8.6 Variations in bath temperature and pressure in the
      gas/liquid cyclone separator
  8.7 Premature condensation
9 Test report
Annex A (informative) Selection of measurement temperature
        and pressure
Annex B (informative) Examples of the line-up of the apparatus
Annex C (informative) Example of calibration of the differential
        pressure gauge for the indirect automatic method - Method B
Annex D (informative) Example of an indirect automatic
        measurement - Method B
Annex ZA (normative) Normative references to international
         publications with their relevant European publications

Describes the principles of, and general requirements for, two gravimetric methods for the determination of the potential hydrocarbon liquid content of natural gas, or similar gas, at a given pressure and temperature.