6.4.4a
6.4.4c
6.4.4b
6.4.4d
6.4.4e
Page 52 of 68
INDUSTRIAL PUMPS
www.
debem.com
Chapter 6 - Routine Maintenance
Translation of Original Instructions - BOXER rev.
2021
6.4.4
CHECK AND/OR REPLACEMENT OF DIAPHRAGMS (End of Life)
The diaphragms (internal and in contact with the product) are components subject to wear. Their duration
is strongly affected by the conditions of use and by the chemical and physical stresses. From tests car-
ried out on thousands of installed pumps (with head equal to 0.5 m at 20°C), it was found that the normal
duration exceeds 100,000,000 (one hundred million) cycles.
CAUTION:
For safety reasons, in environments with a potentially explosive atmosphere,
the pump diaphragms must be disassembled and checked
every 10,000,000 (ten million) cycles and
preventively replaced every 20,000,000 (twenty million) cycles.
MANDATORY OPERATIONS
SCHEDULING OF OPERATIONS
every 500 hours
CHECK
every 10.000.00 cycles
REPLACEMENT
every 20.000.00 cycles
INTERNAL CLEANING AND CHECK
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--
DIAPHRAGM CHECK
--
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DIAPHRAGM REPLACEMENT
--
--
Safety requirements before starting the operation:
• Pump removed from the workstation and residual pressure inside the air circuit discharged;
• Pump with the external parts cleaned/washed;
• Pump with internal product circuit washed and decontaminated (according to the pumped liquid).
• Pump with product circuit drained of the contaminated washing liquid.
6.4.4a
Disassemble the suction and delivery manifolds by removing the fastening elements.
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).
6.4.4b
Disassemble the fixing screws and remove the pump casings.
6.4.4c
Remove the diaphragm locking cap of both circuits.
6.4.4d
Check that there are no solid deposits, otherwise remove them with a disposable clean cloth dampened with a
detergent suitable for the treated product, clean the diaphragms.
CAUTION
:
risk of damage and/or fire.
Do not use detergents that are not compatible with the construction materials of the pump, solvents and/
or flammable substances.
6.4.4e
Remove the diaphragms from both sides of the pump.