DVLS Oily Residues in LPG Analyzer ASTM D7756

The DVLS Oily Residues in LPG Analyzer determines residues in liquefied petroleum gases by gas chromatography according to ASTM D7756 and EN 16423. The analyzer includes the DVLS Liquefied Gas Injector and the Pressure Station developed by Da Vinci. 

Sampling and analysis of liquefied gases

The direct injection approach of the Liquefied Gas Injector includes the proven fuel direct injection technique used by the automotive industry to inject fuel into the automotive engine combustion chamber. The LGI is connected to a standard GC injector needle, which is inserted into a GC large volume on-column injection system. Solenoid activation transfers the pressurized sample through the needle directly on-column. A sliding device moves the needle downwards for the injection and upwards for purging.

To allow a representative sample injection a Pressure Station is used to keep the sample in a liquid phase during the injection. The sample cylinder is installed using quick connectors. For liquid samples the Pressure Station adds high pressure Nitrogen to the sample cylinder and controls the outlet pressure and flow. Optionally the Pressure Station can also be configured for gas samples by including a vaporizer to control the sample evaporation after injection. The waste sample is vented to a central waste system to ensure laboratory safety.

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  • Applications

    The DVLS Oily Residues in LPG system complies with the following standard test methods: 

    • Residue and light contaminants in LPG (ASTM D7756-13, EN 16423)

    Adapting the hardware setup allows to extend the LPG analysis to a wider application range:

    • Hydrocarbon composition of LPG (ASTM D2163 and ISO 7941)
    • Sulfur compounds in LPG
    • Desulfurization additives in LPG: DIPA, MEA & DEA
    • Inhibitor, additives and Dimers in Butadiene

     

     

  • Benefits

    • Safe injection of liquefied gases: The direct injection approach of the LGI is based on a proven fuel direct injection technique used by the automotive industry which eliminates the need for sample evaporation
    • Representative sampling: The pressure station ensures that the sample remains in the liquid phase during the injection process
    • Proven technology: Since its introduction in 2010 the analyzer has been successfully used by a global installed base of leading oil refineries.
    • Wide application range: Adapting the hardware setup allows to extend the LPG analysis to a wider application range: hydrocarbon composition, impurities, contaminants and sulfur compounds in liquefied gases.
    • Accurate and fast performance: Several case studies demonstrate an excellent and fast performance of the analyzer

  • Downloads

    DVLS Liquefied Gas Injector Brochure

    DVLS Pressure Station Flyer

    Click here for the application notes

  • Options

    • Pressure Station:
      DVLS Pressure Station with VaporizerTo allow a representative sample injection a Pressure Station is used to keep the sample in a liquid phase during the injection. The sample cylinder is installed using quick connectors. For liquid samples the Pressure Station adds high pressure Nitrogen to the sample cylinder and controls the outlet pressure and flow.
      Optionally the Pressure Station can also be configured for gas samples by including a vaporizer to control the sample evaporation after injection.
      The waste sample is vented to a central waste system to ensure laboratory safety.

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