FDM P 605, Руководство пользователя, Страница: 25 / 181

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4 Separator basics 4.1 Design and function
Water seal in purification
To prevent the oil from passing the outer edge of
the top disc (I) and escaping through the water
outlet (221), a water seal must be provided
in the bowl. This is done by filling the bowl
with water through the water inlet (206), before
unseparated oil is supplied. When oil feed is
turned on the oil will force the water towards the
bowl periphery and an interface (X) is formed
between the water and the oil. The position of
the interface is determined by the size of gravity
disc (K).
Displacement of oil
To avoid oil losses at sludge discharge,
displacement water is fed to the bowl.
Prior to a discharge the oil feed is stopped and
displacement water added through the water
inlet (206). This water changes the balance in
the bowl and the interface (X) moves inwards
to a new position (Y), increasing the water
volume in the sludge space. When the sludge
discharge takes place sludge and water alone
are discharged.
A new water seal will be established immediately
afterwards. The oil feed is then turned on again.
Gravity disc
In the purification mode, the position of the
interface (X) can be adjusted by replacing the
gravity disc (K) for one of a larger or smaller size.
A gravity disc of a larger size will move the
interface towards the bowl periphery, whereas a
disc of a smaller size will place it closer to the
bowl centre.
The correct gravity disc is selected from a
nomogram, see
8.3.3 Gravity disc nomogram
on page 171 . The sizes of the gravity discs are
normally stamped on the discs.
Clarifier disc
In the clarification mode, the gravity disc is
replaced by a clarifier disc which seals off
the water outlet. In this case no water seal is
required and consequently there is no oil/water
interface in the bowl. The clarifier disc is an
optional disc with a hole diameter of 40 mm.
This disc is not shown in the nomograms.
G0112391
Principle of liquid seal and displacement water
in purification
H. Sludge
I.
Top disc
K. Gravity disc
X. Normal interface position
Y. Interface position just before discharge
206.Water inlet
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