December 2020
Installation, Operation and Maintenance Manual
MAN 606 Rev. 5
Maintenance
28
Section 5: Maintenance
Section 5: Maintenance
NOTICE
Before carrying out any maintenance operation, it is necessary to close the hydraulic feed
line and exhaust the pressure from the actuator cylinder and from the control unit, to
ensure safety of maintenance staff.
!
WARNING
Installation, commissioning and maintenance and repair works should be carried out by
qualified staff
.
5.1
Periodic Maintenance
OLGA actuators are designed to operate long-term in heavy-duty operating conditions,
without maintenance needs.
NOTICE
Periodicity and regularity of inspections is particularly influenced by specific environmental
and working conditions.
!
WARNING
They can be initially determined experimentally and then be improved according to actual
maintenance conditions and needs.
Anyway every
2 years
of operation the following is recommended:
•
Check that the actuator operates the valve correctly and with the required
operating times. If the actuator operation is very infrequent, carry out a few
opening and closing operations with all the existing controls (remote control, local
control, emergency controls, etc.), if this is allowed by the conditions of the plant.
•
Check there are no hydraulic leakages. If necessary tighten the nuts of
the pipe-fittings.
•
Check oil level (Figure 26) into the hydraulic control unit (see Section 5.1.1).
•
Check the actuators did not undergo accidental damage with oil leakages found
on site (Section 5.1.1).
•
Check that improper closing of control-group cover (if present) did not produce
the presence of condensation on it.
•
Check the integrity of worn out parts (gaskets, pads etc.).
•
If there is an oil filter on the actuator, bleed the condense water accumulated in
the cup by opening the drain cock. Disassemble the cup periodically and wash
it with soap and water; disassemble the filter: if this is made up of a sintered
cartridge, wash it with nitrate solvent and blow through with oil. IfS the filter is
made of cellulose, it must be replaced when clogged.
