Hybrid tank gauge system is mostly used in petroleum industries, where online measurement of level, density and temperature are required.
Design of hybrid tank gauge system:
To calculate the density of liquid in the tank, pressure sensors are installed in the tank. Therefore, if the tank has atmospheric pressure, the hybrid tank gauge system has one pressure sensor and two pressure sensors if the tank is not ventilated freely.
Pressure measurement, combined with level, provides true average density measurement over the entire product level height
A typical HTMS tank gauge system comprises of either a radar or servo gauge and one hydrostatic head measuring pressure transmitter-the fluid product column pressure in tanks. For those tanks where the gas or vapor pressure the pressure in the empty part of the tank is not ambient, for example, in cases where the tank is not open to the atmosphere, an additional pressure transmitter must be added.
Hydrostatic Tank Gauging:
There is an extra pressure sensor and no level tank gauge system in the Hydrostatic Tank Gauge (HTG) scheme. Only the density between the P1 and P2 sensors calculates the product density in the HTG scheme.
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