Transas Gets Approval for Saint Lawrence Seaway Draft Information System

(Press Release)
Monday, July 16, 2012

The St. Lawrence Seaway is one of the most important transportation links in North America. To maximize the efficient use of the seaway, in 2001, the Seaway authorities started to a study which would determine the maximum load ships can carry while maintaining a safe Under-Keel Clearance (UKC).
Over the years the maximum draft of vessels transiting the Seaway in the MLO Montreal to Lake Ontario and the Welland Canal has been gradually increased. At the opening of the Seaway in 1959, the maximum draft for ships was set at 6.85 meters (22 feet 6 inches ).  This maximum draft is now set at (26 feet 6 inches). However, changes in water levels and a phenomenon called ship sinkage or "squat" made adjusting the maximum draft again more complicated.
Draft is measured prior to departure but a moving ship actually sits much lower in the water, particularly in shallow or constrained channels. How much a ship "squats" depends on factors such as the size and speed of the ship, shape of the channel, depth of the water, currents, wind, and even the presence of other ships.
Undertaken at the request of the St. Lawrence Seaway Management Corporation and industry partners that included the Canadian Ship owners Association and the Shipping Federation of Canada, the mentioned study resulted in standard squat models for the various types of vessels transiting the Seaway.
Over the past year and a half, the St. Lawrence Seaway authorities have developed a functionality description of a Draft Information System that incorporates the Seaway squat models, which was finally approved by all stake holders in March of this year and was then issued to the public.
In accordance with this specification, TRANSAS has developed a Draft Information System ( DIS ) based on the NS4000 ECDIS which allows the accurate display of the vessel’s position, real time water levels and data from highly detailed bathymetric charts.
An independent functionality verification and assessment was performed by Lloyds Register in June of this year after which the system was installed on board the M/V ALGOMA SPIRIT for final approval by the St. Lawrence Seaway authorities.
The TRANSAS Draft Information System successfully passed the performance tests without comments or open items. The DIS can run as a stand-alone system or in a network with the Transas NS4000 ECDIS providing a unique combination of precise navigation instruments, high definition chart data and real-time navigation information in both the DIS and the ECDIS. The Transas DIS is built on the same hardware platform as the Transas NS4000 ECDIS MFD providing for better redundancy and lower cost of maintenance.
The Draught Information System (DIS) is a program designed to calculate and display the under-keel clearance (UKC) on the basis of the following data:
• High Resolution Bathymetry data provided by the Canadian Hydrographic Service (CHS);
• Water levels; received automatically via Seaway AIS stations of a network of water level gauge stations or set manually by the user;
• Ship forward and after draft set manually by the user;
• Ship Squat based on Seaway Squat Models for the vessel and channel type.
In dangerous navigational situations or under system fault conditions, relevant notifications will be provided for the operator. When the DIS is connected to the Transas NS4000 ECDIS network, any ECDIS can be set up as the DIS for back-up purposes in the same way as the DIS can be used as the ECDIS back-up. The Draught Information System button in the “UKC Data” display is intended for switching between the DIS mode and standard ECDIS mode. When the DIS mode is turned off, the MFD can operate as an additional work station.
The DIS will indicate whether certain areas are safe to pass or require speed adjustments to decrease the squat of the vessel. A required safety margin of 30 cm of UKC has to be maintained. The HD chart contours are then filled in with colors indicating safe passage areas.
The availability of this data on the bridge of the vessel will enable most vessels to maximize their draft up to 26 feet 9 inches from  the current Seaway permissible draft of 26 feet 06 inches.  This increase of 3 inches would mean that the average Great Lakes vessel can carry an additional 250 to 400 tons of cargo. The investment in this equipment will result in greater operational and environmental efficiencies based on a tonne / mile matrix.
Paul Welling,  Regional Sales Director, North America for Transas USA : “ The DIS development will not only benefit our customers but is also a huge benefit to safe navigation in the St. Lawrence Seaway. We are proving again that Transas Sets the Standard “.
Tom Anderson,  Director, Ports & Harbours, Navigation , Algoma Central Corporation : “The use of the Transas DIS will allow for the safe and effective deep loading of our vessels to optimize the full available water column in the Seaway.  The use by our vessel personnel of the Transas DIS integrated with shipboard ECDIS/ECS and the supporting Seaway AIS network is an example of an e-Navigation initiative that was developed for a specific area user that has further potential for use in other ports and their connecting waterways.”
www.transas.com

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

People & Company News

Coast Guard Foundation to Honor USCG in Miami

The Coast Guard Foundation, a nonprofit organization committed to the education and welfare of all Coast Guard members and their families, announced today that

Maritime Broadband Opens Office in Greece

Maritime Broadband has expanded its worldwide footprint by opening an office, Maritime Broadband Hellas, in Athens, Greece. The new office addresses the growing

Renewable Energy: Schottel Tidal Turbines Ready For Use

In the last months Schottel  successfully tested its hydrokinetic turbines in Strangford Lough, Northern Ireland. The full-scale tests included 260 operating hours under realistic conditions.

Navigation

Sunken Barge Salvage Stops Traffic on Chicago River

The U.S. Coast Guard said it is restricting vessel traffic on the Chicago River to allow for salvage of a sunken barge. All cargo has been removed from the sunken

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,

Long Beach Port Honors OOCL Executive

Andrew Tung, CEO and Managing Director of Orient Overseas Container Line, was presented today with the prestigious “Port Pilot Award” by the Long Beach Board of Harbor Commissioners.

Maritime Safety

Sunken Barge Salvage Stops Traffic on Chicago River

The U.S. Coast Guard said it is restricting vessel traffic on the Chicago River to allow for salvage of a sunken barge. All cargo has been removed from the sunken

USCG Reopens Port Allen Post Hurricane Ana

The Coast Guard Captain of the Port reopened Port Allen in Kauai Monday morning after surveying crews deemed it  safe for transit. The maritime public is advised

Mitsubishi Super Skiving System

Mitsubishi Heavy Industries, Ltd. (MHI) has completed development of the "Mitsubishi Super Skiving System" for machining internal gears with high speed and outstanding precision.

 
 
Maritime Standards Naval Architecture Navigation Offshore Oil Pipelines Salvage Ship Electronics Ship Repair Ship Simulators 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: 0.2048 sec (5 req/sec)