Maintenance Manual
KONGSBERG PROPRIETARY.
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Steering Gear system errors not detected by the Automatic Isolation system
Scenario 1
Rudder response is very poor or non-existent
1.
Separate system by pressing “MANUAL
ISOLATION
”. Both Pump 1 and Pump 2 will now
be running. Press “Manual By
-
pass System 1” and stop Pump 1.
Give rudder command from Steering Control system.
2.
Outcome;
Rudder response POSITIVE:
Failure in system 1.
Rudder resones NEGATIVE:
Failure in system 2.
3.
Continue operation with “MANUAL
ISOLATION
” activated.
Failed system should be kept closed.
4.
Torque capacity is reduced to 50% of maximum.
Cause:
By-pass valve may be locked in OPEN position.
Scenario 2
System works nomally until “Automatic Isolation” is activated by loss of hydraulic oil
1.
System working as normal.
2.
Loss of hydraulic oil from system.
“Automatic Isolation” will separate system 1 and system 2
.
3.
Outcome
–
loss of steering!
Defect system
will be identified by “Low Low Oil Level” alarm
.
4.
Press “MANUAL
ISOLATION
”.
Continue operation
–
Check situation in Steering Gear room!
Cause:
By-pass valve may be locked in CLOSED position.
Scenario 3
System works nomally until “Automatic Isolation” is activated by loss of hydraulic oil
1.
System working as normal.
2.
Loss of hydraulic oil from system.
“Automatic Isolation” will separate system 1 and system 2.
3.
Outcome; Steering continues with system 1 and system 2 working separately.
4.
Defect system will be detected automatically and isolated depending on which system
is loosing oil.
Cause:
One Isolating valve may be locked in OPEN position.
Scenario 4
System works nomally until “Aut
o
matic Isolation” is activated by loss of
hydraulic oil
1.
System working as normal.
2.
Loss of hydraulic oil from system.
“Automatic Isolation” will separate system 1 and system 2.
3.
Outcome; Separation fails for line affected by failing isolation valves.
4.
Check situation in Steering Gear room!
Cause:
Both Isolating valves on same line may be locked in OPEN position.
Scenario 5
System running with one pump only
1.
Loss of steering.
2.
Press “MANUAL ISOLATION”.
Pump 2 will start automatically.
3.
Outcome; system will work as “normal”.
Continue operation with both pumps in paralell.
Cause:
One or more Isolating Valves may be locked in CLOSED position.
