－
7
－
[G] Periodical maintenance
Frequency
Inspection / Maintenance
Note
1
Sealing
Condition
1 time/day
Check visually or measure if there is
any leakage, and increase or
decrease in leakage rate.
A little leakage of water from the
seal ring is acceptable on account of
lubrication and cooling.
Amount of water
leakage. (L/day)
Size Less than
～
190
40
210
～
310
50
330
～
80
2
Supply water
pressure
1 time/day
Check it is equivalent that supply
water pressure is shaft center level
pr 0.01
～
0.03 MPa.
Pressure gauge to be
positioned in close
vicinity to the seal.
3
Sea water
filter
1 time/wk.
Check and prevent clog condition of
element.
Adjust frequency of
inspection, and sweeping
clog for good condition.
4
Grounding
device
1 time/wk.
Check carbon brush works well.
Check and remove dust and oil on
sliding surface.
5
Inflatable
ring
1 time/yr.
No leakage of water at 0.3
～
0.6 MPa
of air pressure.
Air pressure drop in piping to be
within 10 %/Hr.
Inspection to be done
before docking.
Releasing air in the
inflatable ring to be
done after inspection.
6
Disassembly
condition
1 time/yr.
Check seal ring works well and its
installation position.
No excessive wear or
deformation on seal ring.
Confirm that something clogged in
the grooves of outside sliding
surface of seal ring.
Something clogged in
the grooves cause the
sliding surface to hot.
Check wears down condition of mating
ring.
If the amount of wear
down on the sliding
surface is over 0.5mm
in depth, it should be
reconditioned by
lathing.
Check condition of shaft sleeve
surface.
If EPOXY PAINT peeled
off, repainting to be
done.
7 Rubber hose 1 time/yr.
Check the crack of the rubber hose. When there is crack,
exchange promptly.
Check the slack of the hose band.
Bind the hose band
tight so that there is
no slack.
