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4.2
Definitions
4
Separator basics
4.2
Definitions
Back pressure
Pressure in the separator outlet.
Clarification
Liquid/solids separation with the intention of separating particles,
normally solids, from a liquid having a lower density than the particles
Clarifier disc
An optional disc, which replaces the gravity disc in the separator bowl,
in the case of clarifier operation. The disc seals off the heavy phase
outlet in the bowl, thus no liquid seal exists.
Counter pressure
See Back pressure.
Density
Mass per volume unit. Expressed in kg/m
3
at a specified temperature,
normally at 15 °C
Gravity disc
Disc in the bowl hood for positioning the interface between the disc
stack and the outer edge of the top disc. This disc is only used in
purifier mode.
Interface
Boundary layer between the heavy phase (water) and the light phase
(oil) in a separator bowl.
Intermediate Service (IS)
Overhaul of separator bowl and inlet/outlet. Renewal of seals in bowl
and inlet/outlet.
Major Service (MS)
Overhaul of the complete separator, including bottom part (and
activities included in an Intermediate Service). Renewal of seals and
bearings in bottom part.
Phase
Light phase: the lighter liquid separated, e.g. oil.
Heavy phase: the heavier liquid separated, e.g. water.
Purification
Liquid/liquid/solids separation with the intention of separating two
intermixed and mutually insoluble liquid phases of different densities.
Solids having a higher density than the liquids can be removed at the
same time. The lighter liquid phase, which is the major part of the
mixture, shall be purified as far as possible.
Sediment (sludge)
Solids separated from a liquid
Sludge discharge
Ejection of sludge from the separator bowl.
Throughput
The feed of process liquid to the separator per time unit. Expressed
in m
3
/hour or litres/hour.
Viscosity
Fluid resistance against movement. Normally expressed in centistoke
(cSt = mm
2
/s), at a specified temperature.
Water seal
Water in the solids space of the separator bowl to prevent the light
phase (oil) from leaving the bowl through the heavy phase (water)
outlet, in purifier mode.
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