Stern Tube Seal · Shaft Line Equipment
A Blohm+Voss Aegir marine stern tube seal provides a multi‑seal lip arrangement to keep water out of the shaft line while retaining lubricating oil, featuring an aft‑seal oil monitoring port for early detection of seawater ingress.
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What our service work and the manufacturer documentation say about keeping this model running.
Multiple seal arrangement (typically 3-4 seals). Monitor aft seal oil condition for seawater ingress. Drydock seal replacement.
| Header tank level / monitoring port check | daily to weekly, per PMS |
|---|---|
| Oil sample analysis | every 3-6 months |
| Header tank oil renewal | annually, or per maker recommendation |
| Seal lip set renewal | typically at drydocking (roughly 2.5-5 years), condition dependent |
Typical intervals for this design class, not the manufacturer’s figures for your model. The manufacturer’s manual is binding.
| Lip seal running surface wear | renew on visible grooving or once leakage exceeds an acceptable drip rate - confirm against maker limits, not a fixed figure |
|---|---|
| Shaft liner wear | assess against class/maker diametral wear tables for the shaft size - no single generic figure applies |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Examined at drydocking/special survey, together with shaft withdrawal or approved in-water survey where applicable; class will look at oil sample records, monitoring port logs and any history of seawater contamination.
Estimated lifetime: Multi-lip stern tube seals of this type commonly serve 20,000-40,000 hours or roughly 2.5-5 years between drydock renewals, strongly dependent on lubrication and alignment - confirm against maker data
Blohm+Voss (Aegir): Dichtungs-Elemente und Verschleißmesswerkzeuge an Bord vorhalten. Lead time: 4-8 Wochen.
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