HOUSTON – Bisso Marine has acquired the offshore pipelay derrick/pipelay barge Global Iroquois. The 400-ft x 100-ft x 30-ft laybarge has performed pipelay operations worldwide and will be renamed Bisso Iroquois.
The central part of the barge’s station-keeping system are the ten single drum winches with 320 kips of pulling force and 744 kip holding force each. Each single drum winch holds 5,300 ft of 2.5-in. wire rope. The barge’s main tub-mounted dynamic revolving crane has a 250-ton capacity, and the deck crane is a Manitowoc 4100W Series 2.
The pipe-handing system is designed to handle 40-ft pipe joints but can accommodate 60-ft joints with some modifications. The pipe handling system can handle pipe joints weighing up to 38 tons each. Through a series of conveyors, pipe is fed into a fully enclosed ready rack, line up station and firing line. The firing line features eight work stations, four of which are dedicated to welding.
The barge is configured with two 220 kip SAS tension machines with a total capacity of 440 kips of tension. The tensioners can pass an 84-in. maximum diameter. To accompany the two SAS tensioners is a 440-kip capacity (on a full drum) SAS abandonment and recovery (A&R) winch capable of holding 5,000 ft of 3.5-in. wire rope. The barge is also outfitted with six 75-ton davits.
The primary stinger system is a two-section, 180-ft gantry supported rigid truss. An alternative floating “Alpha” pontoon stinger system is also available. The 300-ft Alpha stinger is composed of five 60-ft sections.
The company says that the barge can accommodate 256 persons and features a large galley and dining area, a large theater, several conference rooms, ample client office space, a gym and a three bed hospital. The below deck machinery space houses all ten mooring winches, three main generators providing 7,875 kW of electrical power, 1,200 gal/hr water making, substantial capacity for fuel, warehousing and dry stores. The barge has on-board machining and milling capabilities.
Bisso says that over the past decade, the barge has been reconfigured and has received significant capacity, technology, and efficiency upgrades to enable it to perform internationally in very harsh environments for long durations.
The barge has most recently worked offshore Brazil, where it laid numerous pipelines up to 34-in. diameter with heavy concrete coatings in water depths ranging from 20 ft to 300 ft. Bisso says that the barge has an impressive track record of laying very large and heavy concrete coated pipe, up to 55.5-in. diameter, as well as laying 30-in. concrete coated pipe in approximately 800 ft of water.