5.2.3a
5.2.1
Page 41 of 68
INDUSTRIAL PUMPS
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Chapter 5 - Commissioning and Stop
Translation of Original Instructions - BOXER rev. 2021
5.2 NORMAL STOP OF THE PUMP
Do not stop pumping the liquid and/or the operating pump by closing the on/off valves of the product suc-
tion and/or delivery duct. The pump and fluid must always be stopped by stopping the pneumatic motor
of the pump, by disconnecting the air.
Requirements after the normal stop of the pump
• After the normal stop of the pump, the liquids that crystallise must be discharged and the inside of the
pump must be washed immediately after stopping;
• If the liquid to be processed is changed after the pump has stopped, it is necessary to perform drain-
ing and the internal washing;
• After the pump has stopped, it is necessary to drain the toxic or harmful liquids and perform the inter-
nal washing before performing repair or maintenance operations.
5.2.1
Only act on the air supply to stop the pump normally: close the control valve, the 3-way valve
and discharge the
residual pressure of the pump pneumatic system.
CAUTION
risk of stalling, premature wear/breakage of the diaphragms.
Never stop the pump (when it is running and/or when the pneumatic circuit is under pressure) by clos-
ing the product circuit suction valves, to avoid premature wear and/or breakage of the diaphragms and
residual pressures in the pneumatic circuit inside the pump.
5.2.2
Boxer pumps are not self-draining, therefore, if fluids are used that crystallise, it is always necessary to wash the
inside with suitable liquid immediately after the stop.
CAUTION
: risk of damaging the pump.
The prolonged shutdown of the pump containing fluids that crystallise, can cause the valves and dia-
phragms to stick and the subsequent malfunction
.
5.2.3
If the stop is definitive and prolonged, it is necessary to:
7.2.4a
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
: risk of internal back-pressures and projection of components during disassembly.
In severe conditions (incorrect installations and/or stops and/or in stall conditions), residual pressures inside
the pump can be generated which are not discharged. Before opening and disassembling the pump, it is
necessary to secure the pump casings with a suitable ratchet strap and wear suitable Personal Protective
Equipment (PPE).
Pump stop is thus completed.
5.2.2
Internal
washing
