Patterson, La.-based Gulf Craft Inc. has delivered another aluminum crew/supply boat to Seacor Marine Inc., Houston. The 175’×30’×13’6″ waterjet-powered Seth McCall is now supporting offshore oil and gas activities in the Gulf of Mexico.
The vessel’s 100’×24’6″ aft deck has 2,450 sq. ft. of cargo space for the loading of up to 225 LT of freight. The deck can support 540 lbs./sq. ft.
The aft deck also holds twin SKUM fire monitors each capable of 5,300 gpm.
Tankage includes 26,500 gals. of fuel; 25,300 gals. rig water; 16,700 gals. aviation fuel, 1,250 gals. ship’s water; and 500 gals. lube oil. The Seth McCall can pump drill water at 200 gpm at 200′, fuel oil at 115 gpm at 230′, and aviation fuel at 115 gpm at 230′.
Four Cummins KTA50-M2 diesels, producing 1,800 hp at 1,900 rpm each, supply the boat with its main propulsion. The KTAs are fitted to Hamilton HM-811 waterjets through Twin Disc MG-6848 SC marine gears with 2.47:1 reduction ratios. Running speed for the boat is 31 knots, 26 knots fully loaded.
Thrusters on the Seth McCall include a Thrustmaster TH200R, 200-hp retractable bowthruster, which is interfaced with the DP system and can be used for manual stationkeeping when working offshore in deepwater. There is also a Thrustmaster 30TT150, 150-hp transverse tunnel thruster because the retractable thruster is vulnerable in ports with shallow drafts. The tunnel thruster also improves safety and reduces the time spent docking the vessel.
“Thrustmaster developed an electromechanical valve system, which allows the operator to select the desired thruster at the flip of a switch. Both thrusters run off the same Cummins 6CTA8.3-M diesel engine,” said Rick Stinson, southeast sales manager for Thrustmaster. “This is the first crewboat ever to be built like this, and to the best of my knowledge the first vessel ever built that offers this thruster configuration that operates from the same power source.”
Ship’s service power is provided by two Cummins 6BT5.9-G2 gensets, sparking 99kw of electricity each.
There are accommodations for a crew of eight and passenger seating for 76.
The electronics suite includes two Furuno radars and Furuno Navtex receiver, four ICOM VHF radios, two ICOM VHF remotes, dual GMDSS from Japan Radio, ComNav autopilot, Kongsberg Simrad DPS-1 system, Raytheon loudhailer, and KVH fluxgate compass.
The Seth McCall is certified ABS+A-1 HSC CREWBOAT +AMS DPS-1, USCG Subchapter T and L. The boat was delivered in October.