How to inject a representative amount of liquids & gases into a GC?

To allow a representative sample injection of a liquid or gaseous hydrocarbon stream such as LPG or Propane Da Vinci Laboratory Solutions developed the DVLS Pressure Station. Next to the sample injection the station keeps the pressure at a constant level by adding high pressure Nitrogen to the sample cylinder and controlling the outlet pressure and flow. For gas samples a vapouriser is used to avoid condensation and to control the temperature and pressure in the sample loop.

Proven & Safe Technology
The sample cylinder is installed on the front side of the pressure station using the quick connectors. The waste sample is vented to a central waste system or to a waste line that leads the vapour directly outside the building to ensure the lab safety. This technology has been proven in several applications at sites of leading oil refineries that require a representative sample injection, such as Propane, LPG, Butadiene and Pentane.

Flexible Design
Select from the following flexible configuration options to fully meet your requirements.

• A configuration including a restrictor dedicated to the injection of liquid hydrocarbon samples
• A model configured with a vapouriser to enable the injection of pressurised gases
• A configuration with a vapouriser & restrictor for the injection of liquid & pressurised gas samples
• A configuration including a back pressure regulator to control the pressure
• Various brands of quick connectors such as Swagelok, Walther and Staubli to enable the use of different cylinder sizes.

The Pressure Station can be used standalone or combined with the DVLS Liquefied Gas Injector: a GC solution that is originally developed for the analysis of oily residue in LPG and has been approved as ASTM D7756/EN 16423.

GC Analysis Standard
The LGI solution consists of an injector, a pressure station, a controller box and a GC. The injector is configured on top of the GC inlet and consists of a high pressure injection valve connected to an injection needle, which allows a direct injection. The Pressure Station is installed next to the GC and ensures that the Injector is filled with the sample in liquid phase. The Controller box drives the injection cycling.

The DVLS Liquefied Gas Injector combined with the Pressure Station offers laboratories a safe and proven GC standard for various applications:

• Oily residues and light contaminants in LPG (ASTM D7756, EN 16423)
• Hydrocarbon composition of LPG (ASTM D 2163, ISO 7941)
• Sulfur compounds in liquefied petroleum gases
• Desulfurization additives in LPG: DIPA, MEA & DEA
• Inhibitors, additives and Dimers in Butadiene: ACN, ρTBC, Butadiene Dimer
• Nitrogen, carbon dioxide, hydrogen sulfide and hydrocarbons in unstabilised gas condensate.

Download the application notes for more information.