Alfa Laval AlfaNova 400, Instruction Manual, Page: 15 / 260

Operation English
Plate Heat Exchanger 11 EN
EN
Unit in operation
During operation, check that
media temperatures and pressures are within
the limits stated on the name plate
no leakages appear due to faulty tightening
of the connections.
Protection against freezing
Bear in mind the risk of freezing at low temperatures.
Heat exchangers that are not in operation should be
emptied and blown dry whenever there is risk of
freezing.
Protection against clogging
Use a filter as protection against the possible occur-
rence of foreign particles. If you have any doubt con-
cerning the maximum particle size, consult your
nearest representative of the supplier or look under
Product information at the supplier's Internet site.
Protection against thermal or/and pressure
fatigue
Sudden temperature and pressure changes could
cause fatigue damage to the heat exchanger. There-
fore, following must be taken into consideration to
ensure that the heat exchanger operates without
swinging pressures/temperatures.
• Locate the temperature sensor as close as possi-
ble to the outlet from the heat exchanger.
• Choose valves and regulation equipment which
give stable temperatures/pressures for the heat
exchanger.
• To avoid water hammer, quick-closing valves
must not be used, e.g. on/off valves.
• In automated installations, the stopping and start-
ing of pumps and actuation of valves should be
programmed so that the resulting amplitude and
frequency of the pressure variation will be as low
as possible.
Protection against corrosion
All components in contact with media are manufac-
tured in stainless steel grade AISI 316.
Media causing corrosion to AISI 316 must not be ex-
posed to the heat exchanger.
Insulation
Heating and cooling insulations are available as ac-
cessories.
Note!
Adjustments of flow rates should be made
slowly in order to protect the system against
sudden and extreme variations of tempera-
ture and pressure.
Note!
To avoid damage due to freezing, the
medium used must include an anti-
freeze agent at operating conditions be-
low 5 °C/41 °F and/or when the evapo-
rating temperature is below 1 °C/34 °F.