Simultaneous Stern Tube Seal and Propeller Repair on Vessel

Press Release
Wednesday, April 20, 2011

Last week a Hydrex diver/technician team replaced three seals on a 180-meter tanker berthed in New York while concurrently cropping two of its propeller blades to restore balance to the propeller.
 
The team mobilized from the Hydrex office in Tampa together with all the equipment they needed for the operation. In New York an Aegir Marine specialist joined the team at the ship’s location and the team made all necessary preparations to begin the repair. Both operations were carried out at the same time while the ship was trimmed and at some 60 meters from the quayside.
 
The stern tube seals needed  attention because water was leaking into the monitoring tank. To gain access to them, part of the team built a scaffolding around the assembly. They could then remove the rope guard and carry out an inspection of the entire assembly. This revealed that the two water seals and the oil seal were completely worn, causing the leak, and needed replacing. The diver/technicians then removed the stern tube seals one by one and replaced them with new ones. These were prepared by the Aegir Marine specialist before they were positioned and bonded.
 
At the same time the rest of the team repaired the propeller. They used a pontoon with the cropping equipment on it to reach the blades. One of blades had been severely bent and had suffered several cracks, which ruled out any possibility of straightening it. The team made an exact assessment of the damage and used these measurements to find the best cutting line. They then cut the damaged blade after which they cut the opposite blade at exactly the same place. This was done to make sure that the propeller would be balanced again and to bring its performance back as close to optimum as could be achieved.
 
Besides carrying out both parts of the operation simultaneously, the team also worked in shifts around the clock to limit the off hire time of the vessel. This allowed the superintendent to sail his vessel again with both its propeller and stern tube seals back intact with only a minimal delay.
 

Source: Hydrex

Maritime Reporter August 2014 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Marine Propulsion

Last Call to Register for SHIPPINGInsight

Maritime industry conference and exhibition opens next week in Stamford, Conn. There’s still time to register online for SHIPPINGInsight 2014, the North American

Maritime Reporter @ 75: The Daily Cartoon

Maritime Reporter & Engineering News was founded by John J. O'Malley (1905-1980) in 1939, and today ranks as the world's largest audited trade publication in the world serving the maritime industry,

ClassNK Update Design Support Tool for EEDI Verification

Minimum propulsion power evaluation software extended to calculate added resistance in irregular waves Classification society ClassNK has released the latest

Vessels

Ingalls Authenticates Keel on Aegis Destroyer

Huntington Ingalls Industries' (HII) Ingalls Shipbuilding division today authenticated the keel for the company's 30th Aegis guided missile destroyer, Ralph Johnson (DDG 114).

Steel Cut on First of Three ISVs for KT Maritime

A steel cutting ceremony held last week at the Singapore shipyard of partner company, ASL Shipyard Pte Ltd. marked the start of construction for the first of three

Innovative Trawls Help Reduce the Enviromental Impact

Fishing Company Cornelis Vrolijk, based in IJmuiden, The Netherlands, and its subsidiary Jaczon, based in Scheveningen, The Netherlands, are specialized in pelagic fishing.

 
 
Maritime Careers / Shipboard Positions Naval Architecture Pipelines Pod Propulsion Port Authority Salvage Ship Electronics Ship Repair Shipbuilding / Vessel Construction Winch
rss | archive | history | articles | privacy | terms and conditions | contributors | top maritime news | about us | copyright | maritime magazines
maritime security news | shipbuilding news | maritime industry | shipping news | maritime reporting | workboats news | ship design | maritime business

Time taken: 0.1665 sec (6 req/sec)