Liquefed gas in the petrochemical industry

Applications in Liquid Petroleum Gas (LPG) and Liquid Natural Gas (LNG)

In crude oil distillation processes, liquid gases such as propane and butane are generated. These gaseous substancesare stored either at extremely low temperatures, or under pressure in spherical or horizontal cylindrical tanks. High demands are made in respect to the operational reliability of the sensors, because the tanks cannot be opened for several years at a time.

Level detection with VEGASWING 63

Due to its high pressure resistance and impermeability, VEGASWING 63 is especially suitable for all level detection applications in LPG. The vibrating level switch is absolutely impervious and can be provided with an additional gas-tight leadthrough. The sensors can also reliably detect the empty condition, which is important for preventing a dangerous gas fashover during emptying.

Level and interface measurement with VEGAFLEX 67

Especially for measuring ranges up to 6 m, the guided microwave instrument ofers the best solution for continuous level measurement, with simultaneous detection of the water level in LPG applications. Part of the transmitted signal penetrates the surface of the liquefed gas and is refected by the water surface that exists close to the bottom of the vessel. Both levels are indicated via the analysis of the two signals.

Trouble-free retrofitting with VEGAPULS 68

Retrofitting with standpipes for level measurement is work- and cost-intensive, especially in large vessels. The high-sensitivity radar instrument VEGAPULS 68 can acquire level data of liquid gas without the usual standpipes. A ball valve separates the sensor from the process and enables retrofitting without emptying the vessel.

VEGAPULS 63 – when things get mighty cold

VEGAPULS 63 is the ideal sensor for all applications in extremely low temperatures. Thanks to the antenna cover of PTFE, the instrument can be used even when product temperatures drop to -200 °C. An additional temperature-isolating elastomer seal is not required. For products with poor refective properties, such as liquid nitrogen, application with a standpipe is recommended.