Our Crude oil interface Level Measurement - CLM system is capable of detecting
the different interface levels in storage tanks using standard echo sounder technology
and improved calculation methods. The system is used in subsea oil storage tanks,
storage tanks on board tankers, onshore oil, diesel, water tanks etc. It is currently
operational on several platforms in the North Sea - both concrete and steel tanks.
The illustration shows the principle of open storage, and shows one storage tank
and a buffer cell. Crude oil filled into the top of the tank floats on the top of
a water pillow. When crude oil is filled into the tank, water is displaced out of
the tank via the buffer cell and into the sea. When crude oil is drained off from
the top of the tank, sea water replaces the volume of crude oil that is removed.
The Crude oil interface Level Measurement system uses acoustics to detect the
position of the different interface levels in each of the independent storage tanks.
Based on these measurements, the system calculates the volume of crude oil and emulsion
in the tank. The operator may also visually detect the presence of gas build-up
in the top of a tank. Only acoustic transducers which contains no active components
are placed subsea in the storage tanks. The transducers are connected with cables
to Transceiver and Multiplexer Units located in an instrument room. An Operator
Unit located in the platform control room or in an instrument room communicates
with the Transceiver and Multiplexer Units via an Ethernet line.
A high performance echo sounder system is used to measure the position of the
crude oil and emulsion interface levels. Information about interface levels in each
tank is available as telegrams on a serial line to an external data acquisition
system (DCS). The crude oil and emulsion information is presented as a percentage
of the total volume in each of the tanks.
The crude oil interface level measurement system consist of the following system
- Operator Unit
- Transceiver Unit
- Multiplexer Unit