INNOVATIVE SOLID BOWL CENTRIFUGE TECHNOLOGY

Purging with inert gas
Processing of hazardous
materials
Processes with any risk of
explosion must be controlled
by using inert gas. Generally,
nitrogen is used. Centrifuges
and system parts used for the
processing of hazardous materials
have to be gastight to prevent
the exit of vapors into the
atmosphere as well as to avoid
the entry of air into the system.
Typical examples are processes
in the chemical, petroleum,
Rotor
Seal
Housing
Control of centrifuges
purged with inert gas is
based on differential pressure
monitoring.
Differential pressure monitoring
maintains a fixed constant
overpressure in the sealing
system using control valves.
This ensures a small overpressure
within the sealing system
and the inside of the centrifuge
guaranteeing protection
against air leakage into the
and pharmaceutical industry,
processes with flammable
organic solvents or oil sludge
treatment processes. These
centrifuges comply with
ATEX 95 in Zone 1, up to
temperature class T4.
Purging
Before starting, the entire system
including the centrifuge is
purged. For this purpose, large
volumes of inert gas are flushed
through the system until the
system and product emission
into the atmosphere.
Processing of materials
susceptible to oxidation
Often the processing of beverages
and food requires that
products be prevented from
undergoing oxidation. For this
purpose the leakage of air into
the centrifuge is prevented by
corresponding constructive
measures and positive inert
oxygen is reduced below critical
level with the inert gas.
Purging is complete if a multiple
of the system volume has
passed through the machine or
if an oxygen probe at the centrifuge
housing shows a safe
oxygen concentration.
Continuous inert gas supply
After successful purging and
during the operation with product,
sufficient inert gas is fed
into the system to ensure a
FLOTTWEG purge gas control unit
gas pressures are maintained
at the centrifuge. In many
cases, carbon dioxide is used
as the inert gas. A system
monitoring the flow of gas is
typically used.
small overpressure. This prevents
atmospheric air from
penetrating into the system.
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