Operations & maintenance manual – ASTRA evo (DDE)
ARGALAIR 2020 | Rev. 6
19
1.5 SUCTION AND DISCHARGE PIPING
WARNING:
The suction and discharge piping should be
flexible
to prevent undue stress
and strain on the pump connections. Alternatively use
flexible joints
between the
discharge/suction connection and any rigid fixed piping.
Rigid piping may cause strong vibration and the manifolds to break.
Avoid configuring
the connections with the third character F (i.e. GFF - GBF). It could occur the dripping of the product
pumped onto the pneumatic supply connection.
CONNECTION OF SUCTION PIPE
It is recommended to be very careful during the connection operation of the suction pipe, since just a small
air infiltration will dramatically reduce the suction capability of the pump. Be especially careful during pump
priming. When connecting the suction pipe, following is recommended:
•
The suction hose must be non-collapsible, reinforced type as the pumps are capable of generating a moderate
degree of vacuum (the suction power may shrink the hose).
•
Do not use pipes with nominal diameter smaller than the diameter of the pump connections to have best
suction capability. For negative suction installation and when pumping viscous fluids, use pipes with nominal
diameter greater than the diameter of the pump connections.
•
It is essential that the suction pipe is leak-proof for the pump self-priming operation.
•
Position the pump as close as possible to the point of suction. It is better to use a short suction pipe to avoid air
pockets.
•
Check that the connections hose-pump are correctly tight, and there are no leaks.
•
Avoid installing filters with a solid passage lower than the values stated in the related table. Place filters that
have a filtration surface of at least 20x the nominal section of the pipe.
•
In the case of installation of the above mentioned filters, connect a
suction pressure monitoring system
, in order
to signal those values which may lead to cavitation and sometimes stop the pump when such conditions occur.
CONNECTION OF DISCHARGE PIPE
All components (hose, pipe, valves etc.) on the discharge piping must be designed for
PN10
.
AIR CONNECTION
•
Screw the air hose into the air intake on the central casing of the pump.
•
We recommend that the diameter of the flexible hose must conform to the values shown in (Table 6) or above.
•
Maximum pipe length between air plant and pump: 5m. If a longer length is required, choose a pipe diameter
that does not cause a pressure drop of more than 0.2 bar between the air pickup point and the pump inlet.
1.6
RECOMMENDED INSTALLATION
USE THE PLANT SOLUTIONS INDICATED IN THE FOLLOWING DIAGRAM
Summary of Contents for ASTRA Evo DDE 030
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