In addition to our well-established Face Type seal replacement service the Alliance recently introduced our newest Subsea Solution, underwater replacement of Lip Type stern seals. Now for the first time, complete rebuilds, including bonding new seal rings, can be performed underwater using TransHab (Transportable Habitat). 

TransHab is a lightweight, inflatable habitat that is fitted around the stern seal between the stern tube and propeller, thereby providing a dry environment large enough for two technicians to carry out repairs. Using stock adapters TransHab is designed to fit any seal arrangement, including azipod drives, with liner sizes from 480mm - 1000mm and can be easily modified to fit sizes outside this range. 

 

Certified Seal Technicians
Professional diver/technicians trained and certified by the major seal manufacturers to carry out repairs previously possible only above water. Bonding new seal rings, removal or installation of spacer rings, and even complete replacements can be performed at anchor or during cargo handling operations without interference with the vessel’s schedule.

Class Approved
As part of the system development, Classification Society representatives witnessed test bonding of seal ring samples inside TransHab at a seawater depth of 12m. Destructive testing of the samples proved strength values similar to dry-dock bonding, resulting in Classification Society and seal manufacturer approval.
 

Fast Response
TransHab systems, including electrical powered diving support equipment, are packaged and stored in several compact crates, allowing it to be shipped anywhere required by air cargo with only a few hours notice.

Stern Seal Replacement & Repair Services include:

  • Lip Seals – dry repair and replacement of complete systems, seal ring bonding 

  • Face seals – wet repairs and replacement (Deep Sea, Cedarvall) 

  • Controlled pitch blade palm seal replacement 

  • Bow/Stern thrusters – shaft seal, blade palm seal, gear case seal replacement 

  • Stabilizers – fin shaft seal, crux seal replacement 

  • Stern tube sealing to facilitate inboard repacking of water lubricated stern seals