- SHIPBOARD
APPLICATION OF THE 256 SUBMERSIBLE
- DP LEVEL
TRANSMITTER
-
- The fuel tanks are divided into 3 or 4
bays.
- Each bay is joined to it's neighbour by
piping thus:-
-
- Each bay is fitted with a series 256 DP
sensor. In operation the tanks are always maintained full
so the ships trim is unaffected.
- The fuelling system works because oil is
lighter than seawater and the seawater is used to push
the oil through the bays and to the engine.
- Because the tanks are always full the
change in hydrostatic head is a function of the
difference in level of the fuel oil to the seawater.
-
- The top reservoir and reference pipe are
permanently filled with seawater to provide a stable
reference pressure. When the tank is also filled with
seawater, there is a balanced pressure on both sides of
the sensor so the output is 4 mA. However, when the tank
starts to fill with oil, a difference develops causing a
change in output.
- By calibration and facilities on the PSM
monitoring system to key in the actual oil specific
gravity, the current content can accurately be measured.
