Alfa Laval 881145-09-01/7, Руководство пользователя

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3 Separator Basics 3.3 Separating function
3.3.2 Position of interface -
gravity disc
In a purifier bowl the position of the interface
should be located between the disc stack edge
and the outer edge of the top disc.
The position of the interface is adjusted by
altering the pressure balance of the liquid phases
oil and water inside the separator. That is done by
exchanging the gravity disc. For this purpose a
number of gravity discs with various hole
diameters is delivered with the machine.
The gravity disc is located inside the bowl hood. A
gravity disc with a larger hole will move the
interface towards the bowl periphery, whereas a
disc with a smaller hole will place it closer to the
bowl centre.
Selection of gravity disc
For selection of gravity disc, see nomogram in
chapter
‘‘8.2.1 Gravity disc nomogram” on page
124 .
When selecting a gravity disc the general rule is
to use the disc having the largest possible hole
without causing a break of the water seal.
The heavier or more viscous the light phase and
the larger the liquid feed the smaller the diameter
should be.
When the heavy phase (water) is wanted more
free from the light one (oil), the interface should
be placed nearer the bowl centre, however not
inside the outer edge of the discs (the gravity disc
is too small), as this would prevent the liquid flow.
G
060
0711
Gravity disc
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