Operations & maintenance manual – ASTRA evo (DDE)
ARGALAIR 2020 | Rev. 6
12
The pipes can be
empty at start-up
. Pumps can be used dry, but it is important to operate at
low speed (low
air pressure/flow)
.
CAUTION:
an empty pump should operate at
low speeds
. During slow operation of the pump the
dry suction lift is better than during high stroke frequency. At high frequency, the efficiency is lower.
The suction lift capacity of a liquid filled pump, however, is much higher.
CAUTION:
The long periods of dry run may cause damage to the pump.
DRY RUNNING AT HIGH STROKE FREQUENCY CAUSES PREMATURE WEAR OF THE COMPONENTS!
Dry negative suction refers to intake of water at the temperature of 20°C/68°F.
ASTRA evo
pumps cannot be used to generate the vacuum.
The purchaser of the pump must be sure that he has correctly evaluated the chemical-physical
characteristics of the fluid.
Note:
The maximum temperature of water in continuous operation (
DESIGN TEMPERATURE
) depends
on the type of construction materials (indicated on the nameplate).
VERSION
MAX TEMPERATURE °C (°F)
WRN-WRX
+60 (+140)
FCN-FCX
+90 (+194)
ALN-ALX*
+100 (+212)
SSN-SSX*
+100 (+212)
SPN-SPX*
+100 (+212)
Table 2
*: for configurations with diaphragms made of TPV the temperature restriction is 90°C (194°F).
The maximum temperature of water in continuous operation depends on the type of construction materials
(indicated on the nameplate) and the environment in which the pump will be installed in.
The
AMBIENT TEMPERATURE
interval is related to the pump's construction materials (specified on the
identification plate):
VERSION
MIN
TEMPERATURE
°C (°F)
MAX
TEMPERATURE °C (°F)
WRN-WRX
-5 (-41)
+40 (+104)
FCN-FCX
-20 (-68)
+40 (+104)
ALN-ALX
-40 (-104)
+40 (+104)
Содержание ASTRA Evo DDE 030
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