13
Figure 2
For correct operation of the system it is important, that during operations an un-interrupted supply of
fresh water is available. The fresh water used must also be free of any contaminants or air bubbles.
The typical installation in drawing 0806-8038 shows a number of manual valves. These are used for
isolation the system or maintenance purposes. The valves are:
fresh water pressure reducing/isolator valve
sample discharge valve skid
isolation valve to slop tank *YARD SUPPLY* (usually a non-return valve, as the slop tank will
most likely be pressurised due to an inert gas system)
sample grab cock mounted on the sample pump discharge
injection point (for onboard calibration by an approved service engineer)
NOTE:
There is an unmarked valve inside the skid assembly on the outlet side of the
measurement cell. This valve is used to provide back pressure for the sample pump. If
the valve is open fully, there will be little or no back pressure on the pump, possibly
causing the pump to cavitate and resulting in erroneous reading of oil content.
The correct setting for the valve is almost closed. In this position the pump discharge
will be in the region of 450–550 litres per hour. This skid-flow can be checked when
sample-mode is entered, in the MCU menu 1.5.3.4.
CONTROL Sample point: 1 22-11-11
window wash Oil type: 5 10:38
Concentration A 200 PPM discharge
Flow A 165 m3/h dirty
Skid Flow 0 l/h com: O
Speed A 10.0 kts pos: O
Discharge rate 3.3 l/nm segregated
Total oil 2.1 l com: C
Latitude 5321.756N pos: C
Longitude 00711.854E
EPU: OK
free: 1927296 kB
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