5.3.4
5.3.1
5.3.2
5.3.3
Page 42
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68
INDUSTRIAL PUMPS
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Chapter 5 - commissioning and shutdown
Translation of original instructions -
S
CUBIC-
S
BOXER
rev.
2021
Stop
EMERGENCY
5.3 EMERGENCY STOP OF THE PUMP
In conditions of detected danger and/or malfunction of the pump, it is necessary to promptly stop it in
emergency conditions proceeding as follows.
Requirements after stopping the pump
• After emergency stop, definitively resolve the
dangerous situation before restarting the pump;
•
After the shutdown of the pump, crystallising liquids must be drained and the pump immediately
flushed internally;
•
If the liquid to be processed is changed after the pump has stopped, it is necessary to perform draining
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.
5.3.1
To stop the pump in emergency conditions, only act on the compressed air supply. Promptly act on the
3-way safety valve (from a protected position upstream of the supply circuit) for the EMERGENCY stop
command.
CAUTION
risk of standstill, early wear/breakage of the diaphragms.
Never stop the pump (when it is running and/or when the pneumatic circuit is under pressure) by closing
the product circuit suction valves, to avoid premature wear and/or breakage of the diaphragms and resid-
ual pressures in the pneumatic circuit inside the pump.
5.3.2
Interlock the 3-way safety valve of the compressed air supply before operating.
5.3.3
Definitively resolve the dangerous condition before restoring the compressed air supply to the pump.
5.3.4
If the stop is prolonged and/or permanent, proceed as described in
Section 5.2 NORMAL STOP OF THE
PUMP
.
Pump emergency stop has thus completed.
5.2.3a
5.2.1
Stop
Page 41
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68
INDUSTRIAL PUMPS
www
.debem.com
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 SCUBIC e SBOXER
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.