Company: Waterweights Makes Light Work of Heavy Lifts

Monday, June 09, 2003

The Water Weights division of Imes Inc., under contract with NASSCO (National Steel And Shipbuilding Co.) and in partnership with JW Automarine recently achieved a first in the innovative use of Air Lift Bags to assist in float-out of a vessel from dry-dock. The project was also the largest lift achieved by JW Automarine using this type of bag.

NASSCO of San Diego has been designing and building ships since 1960, specializing in auxiliary and support ships for the U.S. Navy as well as oil tankers and dry cargo carriers for commercial markets. Most recent on their long resume of new builds would be 2 Orca Class roll-on, roll-off (RO/RO) trailer ships for TOTE (Totem Ocean Trailer Express, Inc.). It is to assist with the float-out of these ships that the innovative and cost efficient idea was hatched.

Originally, the NAASCO dry dock was designed for the building and servicing of Super Tankers of 200,000-ton capacity. The draft requirements for these vessels were quite small due to their light ship weight and design, therefore when Nassco was called on to build two of the trailer ships; the draft exceeded the maximum depth possible in the dry dock. The solution after extensive examination was to reduce the draft by fitting underwater lifting bags on the vessel.

The plan involved the fitting of lift bags, each unit having a displacement lift of thirty-five metric tons. Malcolm Felmingham from JW Automarine's "Weight Lifters" team was onsite offering a wealth of advice and assistance. The JW Automarine team's reputation in practical manufacturing, deployment experience and competence with lift bags is without equal worldwide.

After extensive planning and development, rigging of the bags and trials commenced. When everything was deemed safe, trials concluded, and the actual lift took place to coincide with the most suitable tide. The bags were kept continuously monitored and regulated from on board compressors controlled via a 40-valve manifold system by the team. Once the tide height was sufficient for the vessel to lift off the blocks the float-out was successfully achieved. We are very proud of the way challenges are approached by our team and partners, says Imes Inc. President Robin Baxter, "Our Company's goal has always been the provision of innovative solutions to meet our client's requirements worldwide, and we feel we've achieved that with this project".

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

Workboats

MN 100: Horizon Shipbuilding, Inc.

13980 Shell Belt Road Bayou La Batre, AL 36509 E-mail: trshort@horizonshipbuilding.com Website: www.horizonshipbuilding.com President and General Manager: Travis R.

MN 100: Kvichak Marine Industries, Inc.

469 NW Bowdoin Place Seattle, WA 98107 Telephone: 206 545 8485 E-mail: sales@kvichak.com Website: www.kvichak.com CEO/President: Keith Whittemore Number of

Brazil AHTS Contract Breakthrough for Havyard

Havyard says it is to deliver the ship design and equipment for four anchor handling tug supply (AHTS) vessels that are to be built and operated by the Brazilian

 
 
Maritime Careers / Shipboard Positions Maritime Contracts Navigation Offshore Oil Pipelines Port Authority Ship Electronics Ship Repair Sonar 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: 0.2121 sec (5 req/sec)