Chemical Engineering June 2018 - 56
from the environment.
Control
system
The double-acting seals hold a sealed
chamber between two seal-ring pairs that is
filled with a barrier liquid (Figure 10). Pressurization
of the latter creates a secure separation
between process space and the environment.
The pressurized barrier liquid provides
a hydrodynamic lubrication film between the
surfaces of the rotating and the stationary
rings, thus providing the necessary sealing
function. As long as the pressure in the sealing
chamber exceeds the pressure of the
chemical process, the content of the tank
cannot pass through the mechanical seal. In
the rather unlikely case of a total failure of
one of the pair of rings, the subsequent seal
pressure drop would lead to immediate shutdown
procedures. Until completion of such a
procedure, the second seal pair will assume
the seal function.
The pressure within the seal chamber can
be held constant with pumps and pressure
accumulators overlaid with gas. Alternatively,
the pressure of the seal-liquid may be
set to a defined value by a pressure compensator,
as shown in Figure 10. The pressure
compensator is equipped with a pisMechanical
seal
LSSL
LSL
LSH
LSHH
Storage tank
Solenoid valve
Seal liquid
Seal liquid
Pump
Pressure compensator
Short heat trap
ton and exposed on one side to the reactor
pressure. The piston area on the opposite
side is reduced by the cross section of the
piston rod, thus creating a higher pressure
on the seal liquid when in a balanced state.
The pressure ratio corresponds to the ratio
of the two piston areas. With such a device,
the seal pressure is always maintained at a
higher level than that of the chemical process,
without external energy, measurement
or control devices.
The cylinder position can be transmitFIGURE
10. Shown here is
a double-acting mechanical
seal with pressure compensator,
filling level monitor and
central supply unit for multiple
seals [13]
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JUNE 2018
55
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Chemical Engineering June 2018
Table of Contents for the Digital Edition of Chemical Engineering June 2018
Contents
Chemical Engineering June 2018 - Cover1
Chemical Engineering June 2018 - Cover2
Chemical Engineering June 2018 - Contents
Chemical Engineering June 2018 - 2
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Chemical Engineering June 2018 - Cover3
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