
Tab. 2: "Maintenance" schedule for the metering system.
What?
Where?
Where described?
Metering pumps
Functional test
Daily inspection
Pump operating instructions
Metering system operating
instructions
Inspection of the electrical connections,
mechanical intactness, secure fixing
and corrosion damage
Quarterly inspection
Check the starting torques of the fixing
bolts on the dosing head
24 hours after initial commissioning, then
quarterly or when the diaphragm is
replaced
Check and, if required, replace suction
and discharge valves
After 5,000 hours and/or as per the infor‐
mation in the operating instructions for the
pump
Check and, if required, replace the
metering diaphragm
After 10,000 hours and/or as per the infor‐
mation in the operating instructions for the
pump
Back pressure / relief valves
Functional test & diaphragm replace‐
ment
Annually or in the event of a fault
Metering system operating
instructions
Multifunctional valve operating
instructions
Functional test
Weekly inspection
Metering system operating
instructions
Drip tray
Visual inspection for leak-tightness and
damage
Weekly inspection
Metering system operating
instructions
Leakage sensor (drip tray level switch)
Functional test
Annually and/or in line with the specifica‐
tions of the competent authority
Metering system operating
instructions
Threaded connectors and hose connectors
Check for secure fixing and leak-tight‐
ness, tighten if required
Monthly inspection
Metering system operating
instructions
Pipework and hose lines
Visual inspection for leak-tightness and
damage / brittleness
Monthly inspection
Metering system operating
instructions
Maintenance and Troubleshooting
36