StandStand--by Seal 4BL typeby Seal 4BL type

Seawater

1) Normal operating condition(with using high tank)

#1 #2 #3 #3s #4 #5

Japan Marine Technologies Ltd.Japan Marine Technologies Ltd.

by Seal 4BL typeby Seal 4BL type

StandStand--by Seal 4BL typeby Seal 4BL type

Seawater

2) Normal operating condition(with using low tank)

#1 #2 #3 #3s #4 #5

Japan Marine Technologies Ltd.Japan Marine Technologies Ltd.

by Seal 4BL typeby Seal 4BL type

StandStand--by Seal 4BL typeby Seal 4BL type

Seawater

In case of damaging #3 seal ring, #3s seal ring can be activated.

3) Activated condition of #3s Seal ring(as for the example, this figure shows using high tank)

#1 #2 #3 #3s #4 #5

Japan Marine Technologies Ltd.Japan Marine Technologies Ltd.

by Seal 4BL typeby Seal 4BL type

StandStand--by Seal 4BL typeby Seal 4BL typeCountermeasures for abnormal condition at Ship in operation

Seawater#1 #2 #3

Seawater ingressDrain out seawater frequentlyStep-1

Seawater

Close L.O. supply line of #2Step-2

Japan Marine Technologies Ltd.Japan Marine Technologies Ltd.

by Seal 4BL typeby Seal 4BL typeCountermeasures for abnormal condition at Ship in operation

Drain out seawater frequently

Aft stern tube seal tank

Close L.O. supply line of #2-#3 seal chamber

Aft stern tubeseal tank

Drain out the seawater

2

StandStand--by Seal 4BL typeby Seal 4BL type

#1 #2 #3 #3s

Countermeasures for abnormal condition at Ship in operationL.O. moving

from stern tubeCollect L.O. from overflow line

Aft stern tube seal tank

Step-1

Oil

#1 #2 #3 #3s

Put #3s seal ring into operation

Aft stern tube seal tank

Step-2

Japan Marine Technologies Ltd.Japan Marine Technologies Ltd.

by Seal 4BL typeby Seal 4BL typeCountermeasures for abnormal condition at Ship in operation

Collect L.O. from overflow line

Collect L.O.

Aft stern tube seal tank

Put #3s seal ring into operation

Aft stern tube seal tank

#3 #3s

#3s seal ring isactivated by itsdifferential press.

2