EN 12838:2000

Overview

EN 12838:2000 (CEN) - Installations and equipment for liquefied natural gas - Suitability testing of LNG sampling systems - specifies the tests to be carried out to assess the suitability of LNG sampling systems when used, in combination with an analytical device (for example a chromatograph), to determine the composition of liquefied natural gas (LNG). The standard helps ensure that sampling systems deliver representative, reliable samples for accurate compositional analysis.

Key topics

EN 12838 focuses on the functional assessment of LNG sampling systems rather than prescribing analytical methods. Key technical topics and requirements commonly addressed include:

• Suitability and representativeness - verifying that the sampling system produces samples that accurately reflect the bulk LNG composition.
• Compatibility with analytical instruments - assessing the interface and performance when coupled with devices such as gas chromatographs.
• Sample integrity - preventing changes in composition (e.g., fractionation or contamination) during extraction, transfer and conditioning.
• System performance checks - tests to confirm repeatability, reproducibility and stability of sampled material under expected operating conditions.
• Materials and construction considerations - ensuring materials and components are appropriate for cryogenic LNG service and do not bias results.
• Operational and environmental influences - evaluating the effects of temperature, pressure and handling on sampling reliability.
• Documentation and test reporting - requirements for recording test conditions, results and suitability conclusions.

(Note: EN 12838 defines types of tests and assessment objectives; specific laboratory procedures or chromatographic analysis methods are performed according to the laboratory’s validated methods and relevant analytical standards.)

Applications

EN 12838 is used to:

• Validate and commission LNG sampling systems at terminals, loading/unloading facilities and storage sites.
• Support manufacturers of sampling equipment to demonstrate suitability for LNG composition analysis.
• Inform quality assurance and compliance programs for custody transfer, billing and safety-related monitoring.
• Guide laboratories and metrology institutes in verifying sample collection chains before compositional analysis.

Typical users: LNG terminal operators, pipeline and shipping operators, equipment manufacturers, analytical laboratories, regulatory agencies, and safety/QA engineers.

Related standards

• Other CEN, ISO and national standards covering LNG handling, cryogenic equipment, gas analysis and chromatographic testing complement EN 12838. Users should consult applicable analytical method standards and local regulations when implementing suitability testing.

Keywords: EN 12838:2000, LNG sampling systems, suitability testing, liquefied natural gas, chromatograph, LNG composition, CEN standard, sampling system validation.