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Liquid Petroleum Gas (LPG) and Liquid Natural Gas (LNG) Applications
These gases can be liquefied under a pressure of approximately 145 psi (10 bar) or by cooling them down to -94° to -274°F (-70° to -170°C). For economical reasons, both physical principles are often used in combination. Due to the considerable pressure and temperature loads on the materials, the tanks are made of special stainless steel and insulated from the body of the ship. Ball tanks, which jut out visibly over the deck, are commonly used.
Safety is a Key Concern
The non-contact measuring principle of radar enables simple and reliable level measurement. Because of its high operating frequency, the VEGAPULS 63 requires a vessel aperture diameter of only 40 mm. This allows dependable measurement right through the channel of a ball valve fitting. Due to the reflective properties of liquid gas, the use of a standpipe is recommended.
LNG – When it's Really Cold
The VEGAPULS 63 is the ideal sensor for applications in very low temperatures. Due to the front-flush PTFE coated antenna, the sensor requires no sealing material and can be applied in extremely low temperatures down to -274°F (-170°C).
Monitoring the Tank Pressure
Because the liquefaction process depends to a large degree on the pressure inside the tank, this pressure must be monitored continuously. To carry this out at extremely low temperatures, the medium that conveys the pressure to the measuring instrument must be warmed up to -40°F (-40°C) via evaporation lines. The VEGABAR 52 is particularly suitable for this application because of its ceramic measuring cell. The special seal material as well as the dry measuring cell make the sensor suitable for product temperatures down to -58°F (-50°C).
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