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Paraflow Plate Heat Exchanger
Instruction Manual
Issue 5 Section 6.0
June 13, 2008 Page 25 of 36
6.0 STARTUP AND OPERATION
6.1 General
Prior to startup, make sure the unit is correctly
assembled and the piping connected properly. Also,
check that the plates have been compressed to the
proper dimension specified on the general
arrangement drawing. See
Figure 24 and refer to
Section 5.0.
6.2 Startup
Sudden surges and rapid changes in pressure or
temperature must be avoided, as these may damage
the plates and gaskets. Throttling valves, flow
diversion valves and shut off valves must be operated
slowly. Control flows with throttling valves
downstream of the heat exchanger.
Valves located on the outlet side of any liquid stream
must be opened prior to startup to prevent dead
heading the heat exchanger.
If steam or another condensable vapor is used as a
heating media, it must be turned on after liquid has
been introduced on the product side.
During initial startup, the exchanger may develop
minor leaks. If these leaks do not stop when the unit
has reached operating temperatures, refer to
Paragraph 6.5 Troubleshooting.
Air in the heat exchanger will normally be carried out
by the liquid flow. However, it is good practice at
startup to vent air from the system at a high point in
the piping. This will ensure the system is filled with
liquid.
6.3 Operation
During operation, the same precautions against rapid
changes of pressure or temperature during start-up
must be observed. Once normal operating conditions
are reached, temperature and pressure drops must be
regularly checked. Increasing pressure drops and/or
falling temperature may indicate reduced performance
of the heat exchanger. This must be investigated to
determine the cause. See Paragraph 6.5
Troubleshooting.
6.4 Shut
Down
The heat exchanger must be shut down slowly and
allowed to cool naturally to room temperature. Inlet
valves, if used, should be closed before outlet valves.
If steam is used as a heating media, it must be shut off
first. In cooling duties, the cooling liquid must be shut
down first to avoid freezing of the product.
Warning:
Proper assembly and tightening are
required for safe startup and operation.
Caution:
All pipe lines must be inspected and
flushed clean prior to operation. Strainers
are recommended to prevent debris from
installation from entering the unit.
Caution
Do not allow the pressure to change more
than 150 psig (10 bar) per minute or the
temperature more than 20
º
F (11
º
C) per
minute.
Improper startup will cause damage to the
heat exchanger frame, plates or gaskets.
Follow instructions closely
.
Warning:
Do not exceed the maximum operating
pressure or temperature listed on the
general arrangement drawing or damage to
the heat exchanger will result.
Kemper County MM218132 Approved