Offshore Supply Vessels Rebuilt - Cargo Handling, Tank Sounding Automated

Wednesday, January 05, 2000
Two circa-1980 vessels are moored — decommissioned, but preserved from corrosion — in the frigid, dry climate of Murmansk, Russia. The hulls are a superior grade of 22 mm thick steel - not economical to duplicate today, and of significant value. The challenge: rebuild the vessels to meet newbuild standards, and use them in a pending long term contract with a large oil company to supply offshore rigs in the huge Terra Nova oil field off the east coast of Newfoundland. Secunda Marine Services Limited of Dartmouth, Nova Scotia, Canada met this challenge, and now has two multi function, ice class 1C, anchor handling tug supply vessels to add to their fleet. After purchasing the vessels from a Russian oil company in 1998, Secunda transported them to their Dartmouth shipyard. There, the boats were completely gutted in preparation for a rebuild to replace all equipment and meet newbuild standards. In each boat, only the steel hulls and propulsion shafts were saved and all other equipment was installed new, including two 5,500 hp Wärtsilä 16V25 propulsion engines, an Ulstein triple drum waterfall type anchor handling/tow winch with 300 ton line pull, two Leroy Somer 2090 KVA shaft generators, and a Caterpillar 3512B generator. Secunda investigated many suppliers for the automated alarm and cargo operation systems, but found the solution right in their own backyard. Secunda turned to Visual Tag System (VTS) monitoring and control software from Trihedral Engineering of nearby Bedford, Nova Scotia, Canada. The VTS software is used to automate three functions onboard the renamed MV Trinity Sea and MV Burin Sea: pump and valve control, alarm and monitoring, and the tank sounding system. Communicating with Omron C200 series programmable controllers (PLCs), VTS reads 800 digital and analog I/O points. A dual monitor VTS station was installed in the engine control room, and a second similar system was installed on the bridge. The pump and valve control system provides automated control of 112 valves, and remote start/stop of 14 cargo pumps that handle liquid cargo (such as potable water, liquid mud, drill water, mineral oil or brine). The alarm and monitoring system monitors the condition of the main engine, gearbox, shaft lines, thrusters, generators and bilges, generating an alarm when certain set points or thresholds are reached. Finally, the tank sounding system automatically measures the quantity of fluid in approximately 50 cargo tanks. According to Robert Field, Trihedral Control Systems Engineer on the project, "The pace and complexity of this project were a particular challenge. The system design was changing continually, but the flexibility of the software allowed us to accommodate the changes as we progressed through the rebuild, commissioning, and sea trial stages." With an overall length of 269.7 (82.2 m), breadth of 52.1 ft. (15.9 m) and draft of (20.3) 6.2 m, the MV Trinity Sea is currently working and the MV Burin Sea has completed sea trials, undergoing rigorous testing to meet Secunda's standards. According to company sources, Secunda exceeded the expectations of their large oil company client by providing a fully automated system.
Maritime Reporter April 2015 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Shipbuilding

BP Shipping Turns 100

BP Shipping celebrated its 100-year anniversary yesterday, making it the longest continually operating company in the group.   Formed on April 30, 1915 as the British Tanker Company,

Canada to Scale Back Plan for Navy Ships, Go Over Budget

Canadian officials said on Friday a C$26.2 billion ($21.5 billion) program to build 15 naval ships could end up below target and over budget, the latest challenge

US Navy is Buying the Wrong Ship, Costing Taxpayers Billions

The United States will spend $585 billion on its armed forces in 2015 — the biggest military budget in the world by far. That’s just the Defense Department budget

Ship Repair & Conversion

Shipbuilder HII Declares Quarterly Dividend

U.S. shipbuilder Huntington Ingalls Industries (HII) announced today that its board of directors has declared a quarterly cash dividend of $0.40 per share, payable on June 12,

Navy Sale Helps Hornbeck Earnings

Hornbeck Offshore Services completed the sale of three supply vessels to the U.S. Navy, helping boost profits in the first quarter even as low oil prices put pressure on revenues.

US Navy Warns Congress that Piecemeal Cruiser Upgrades Costly

U.S. Navy Secretary Ray Mabus on Thursday warned that congressional plans for a piecemeal modernization of 11 cruisers would cost billions of dollars more than

 
 
Maritime Careers / Shipboard Positions Maritime Security Navigation Offshore Oil Pipelines Port Authority Ship Electronics Ship Repair Ship Simulators Winch
rss | archive | history | articles | privacy | 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: 0.1837 sec (5 req/sec)