5.2.3a
5.2.1
Stop
Page 41
of
68
INDUSTRIAL PUMPS
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Chapter 5 - commissioning and shutdown
Translation of original instructions - S
CUBIC -
S
BOXER
rev
. 2021
5.2.2
Washing
interior
5.2 NORMAL SHUTDOWN OF THE PUMP
Do not stop pumping the liquid and/or the operating pump by closing the on/off valves of the product
suction and/or delivery duct. The fluid and pump must always be shut down with the air disconnected.
Requirements after the normal shutdown of the pump
•
After the normal shutdown of the pump, crystallising liquids must be drained and the pump immedi-
ately flushed and stripped
internally;
•
If the liquid to be processed is changed after the pump has stopped, it is necessary to perform drain-
ing and internal washing;
•
After the pump has stopped, it is necessary to drain the toxic or harmful liquids and perform internal
washing before any repairs or maintenance work.
5.2.1
To normally shut down the pump, act on the air supply only: close the 3-way supply/close valve (upstream of the
installed pilot valve)
and relieve the residual pressure
.
CAUTION
risk of standstill, early wear/breakage of the diaphragms.
It is forbidden to stop the pump (in operation and/or with the pneumatic circuit under pressure) by clos-
ing the suction valves of the product circuit in order to avoid premature wear and/or rupture of the dia-
phragms and residual pressure in the pneumatic circuit.
5.2.2
The S
CUBIC e
S
BOXER
pumps are not self-draining so, if they are used with crystallising fluids
, they must be
always flushed or stripped internally with a suitable liquid immediately after shutdown.
CAUTION
: risk of damaging the pump.
Prolonged shutdown of the pump in the presence of crystallising fluids can cause sticking of
valves and
subsequent malfunction
.
5.2.3
If shutdown is permanent and prolonged, proceed as follows:
5.2.3a
If necessary, the product valves can be closed only after having stopped the pump pneumatically.
5.2.4
After the first two hours of operation and after stopping the pump correctly, check that all of the pump
bolts are tight.
CAUTION
: Danger of internal back pressure and ejection of components during disassembly
.
In abnormal conditions (incorrect installation and/or shutdown and/or standstill conditions), residual pressure,
which is not discharged, may be generated inside the pump. Before opening and disassembling the pump, it
is necessary to secure the pump bodies with a suitable ratchet strap and wear suitable Personal Protective
Equipment.
Pump shutdown has thus been completed.