stern tube seal

Japan Marine Technologies Ltd.

Stand--by Seal 4BL type Stand 1) Normal operating condition (with using high tank)

Seawater

#1

#2

#3

#3s

#4

#5

Japan Marine Technologies Ltd.

Stand--by Seal 4BL type Stand 2) Normal operating condition (with using low tank)

Seawater

#1

#2

#3

#3s

#4

#5

Japan Marine Technologies Ltd.

Stand--by Seal 4BL type Stand 3) Activated condition of #3s Seal ring (as for the example, this figure shows using high tank) Seawater

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

#1

#2

#3

#3s

#4

#5

Japan Marine Technologies Ltd.

Stand--by Seal 4BL type Stand Countermeasures for abnormal condition at Ship in operation Seawater ingress

Step-1

Drain out seawater frequently

Aft stern tube seal tank #1

#2

#3

Seawater Drain out the seawater

Step-2 2

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

Aft stern tube seal tank

Japan Marine Technologies Ltd.

Stand--by Seal 4BL type Stand Countermeasures for abnormal condition at Ship in operation L.O. moving from stern tube Step-1 Collect L.O. from overflow line Collect L.O.

#1

#2

#3

#3s

Aft stern tube seal tank

Oil

Step-2 2

Put #3s seal ring into operation

#3s #3 #3s seal ring is activated by its differential press.