June 2021
Installation, Operation and Maintenance Manual
MAN712 Rev. 9
Section 5: Working Principle and Detailed Description
Working Principle and Detailed Description
20
The figure below shows the above described types of EVENT that could be memorized
during the pipeline data acquisition.
The Event 1, happened in January, represents a pressure that pass through the values of
30 bar and 25 bar (the “Pressure Decrease” parameter is supposed to be 5.0 bars),
causing the memorization of the events in the “event data memory” (Event 1.1 and
Event 1.2). In February, April, May, July September and November the pipeline pressure
does not generates any Event. The Event 3 represents a pump station start-up, while the
Event 5 is a pump station shut down that creates a pressure drop rate higher than the
ELBS-20 adjustment, so that the Event 5.1, 5.2, 5.3 and 5.4 are memorized into the
"event data memory". The Event 6 represents a Line Break that creates a pressure drop rate
higher than the pipeline curve behavior present in the ELBS-20 memory. In this case, if the
ELBS-20 is in VC or VC+ACQ operating mode, the actuator is controlled in order to stroke
the pipeline valve in the fail position.
Figure 10
Pressure behavior relevant to one year
VALUE EVENT
VALUE EVENT
HIGH PRESSURE
LOW PRESSURE
Time
(hours)
EVENT 1
EVENT 2
EVENT 3
EVENT 4
EVENT 5
EVENT 6
