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of
68
INDUSTRIAL PUMPS
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.debem.com
Translation of original instructions
S
CUBIC -
S
BOXER -
rev
. 2021
PROBLEMS AND SOLUTIONS
CHAPTER 7
The following instructions are intended exclusively for authorised skilled Maintenance Engineers who
know and comply with the contents of the Original Instructions. In the event of abnormal behaviour and in
order to fix faults, please refer to the following troubleshooting instructions. The graphic setting is in table
format with direct correspondence between Anomaly, Possible Cause and Suggestion.
NOTE
For more serious problems, we strongly recommend that you contact the DEBEM SERVICE DEPART-
MENT or an Authorised Assistance Centre; our Engineers will provide you with assistance as quickly as
possible.
CAUTION
Before carrying out any work and gaining access to the pump, you must:
•
Disconnect and interlock the compressed air supply and relieve residual pressure from thepump's
internal pneumatic circuit;
•
Section the product shut-off valves (suction and discharge);
•
Clean the outside of the pump if necessary;
• If necessary, flush (decontaminate) the product circuit inside the pump.
CAUTION
: risk of internal back-pressures and projection 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 casings with a suitable ratchet strap and wear suitable Personal Protective
Equipment (PPE).
ANOMALY
POSSIBLE SOURCE
ADVICE
1 The pump does not start.
1.1
No air in the circuit.
1.2
Insufficient air pressure.
1.3
Insufficient air flow rate.
1.
4
Control valve
damaged.
1.
5
Delivery or suction of the
closed pump.
1.6
Pneumatic insert
damaged pump.
1.7
Broken diaphragm.
1.1a
Check circuit, valves and connections.
1.2a
Adjust pressure on the relevant reducer.
1.3a
Check that piping and accessories have suitable
passage.
1.4a
Check and replace the control valve.
1.
5a
Disconnect the pressure and suction pipes and
check whether the pump starts.
1.
6a
Replace the pneumatic insert; check whether there is
ice on the air outlet. If so, clear it (see
air supply paragraph).
1.7a
if any air comes out from the product delivery pipe;
if so, replace diaphragm.
2. The pump exchanges
but does not move the
fluid.
2.1
The balls do not close.
2.2
Intake too
high.
2.3
Fluid is too viscous.
2.4
Intake side is obstructed.
2.1a
Disassemble the manifolds and clean the ball seats
or replace both
balls and their seats.
2.2a
Reduce intake height.
2.3a
Install oversized pipes, especially in the intake and
decrease pump cycles.
2.4a
Check and clean.
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