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°F to -274°F (-70°C 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. Spherical tanks are commonly used.
VEGAPULS 66 with Ball Valve Fitting
Radar’s non-contact measuring principle enables simple and reliable level measurement. Operating in c-band technology, VEGAPULS 66 only requires a vessel opening diameter of 2 in (50 mm). This allows dependable measurement right through the channel of a ball valve fitting. Due to the low reflective properties of liquid gas, the use of a standpipe is recommended.
LNG – Extremely Low Temperatures
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 -328°F (-200°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. 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).
