Alfa Laval MMPX 303SGP-11, Manual

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3.3 Definitions 3 Separator Basics
32
3.3 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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