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Neptune solenoid pump NSP-M
11 Maintenance
Dosing pumps by Neptune are manufactured to the highest quality
standards and have a long service life. Nevertheless, some of their parts
are subject to wear due to operation (e.g. diaphragms, valve seats, valve
balls). This means that regular visual inspections are necessary to ensure
a long operating life. Regular maintenance will protect the dosing pump
from operation interruptions.
Mortal danger from electric shock!
Live parts can inflict fatal injuries.
ð
Before carrying out any maintenance work, always disconnect
the dosing pump from the power supply.
ð
Secure the dosing pump from accidental power-up.
Danger of personal injury and material damage!
The dosing pump can generate a pressure that is many times the
rated one. The dosing medium can escape in the case of material
failure or wear on the dosing head, the connection pipe or the seals
that are used.
ð
Carry out maintenance work at the recommended intervals.
11.1 Maintenance intervals
This table gives you an overview of maintenance work and the intervals
at which you must carry it out. The next few sections contain instructions
for carrying out this work.
Maintenance work to be carried
out
Check that piping is seated firmly
Check that suction and pressure
valves are seated firmly
Clean suction and pressure valves
Check that electrical connections
are not damaged
Tighten up dosing head bolts
Check diaphragm for leakage due
to rupture
Table 17: Maintenance information and maintenance intervals
DANGER
CAUTION
Frequency
Regularly
Regularly
Regularly
Regularly
Regularly
n
Before initial commissioning
n
After each diaphragm
n
change
Regularly (as long as no leak
monitoring system is installed)
Maintenance work to be carried
out
Check that the installed accesso-
ries are functioning correctly
Check the dosing pump for unusual
noises during operation, unusual
temperatures or smells
Replace parts that are subject to
wear (diaphragms, valves, seals,
etc.)
Rinse out and clean the dosing
pump
Table 17: Maintenance information and maintenance intervals
11.2 Tighten up dosing head bolts
è
Tighten the dosing head bolts in diagonally opposite sequence with a
torque wrench.
The necessary torque is 16 Ibf in.
11.3 Change the diaphragm
Fig. 19:
Exploded view of the diaphragm and dosing head
11.3.1 Remove the old diaphragm
Precondition for action:
ü
You have disconnected the dosing pump from the mains supply.
ü
You have depressurised the hydraulic sections of the plant.
ü
You have rinsed the dosing pump using a safe medium (e.g. water).
Operating instructions
Frequency
Regularly
Regularly
When unacceptable levels of
wear are detected
Before changing diaphragms
n
Before taking out of service
n
for a long period of time
After feeding aggressive,
n
sticky, crystallising or
contaminated liquids
a
b
c
d
e
Maintenance
25
Change the diaphragm
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