Patti Marine Enterprises is busy constructing a pair of 105’×38’×17’8″, 6,800-hp tugs for Signet Maritime Corp. at its Pensacola, Fla., shipyard.
The two Robert Allan Ltd.-designed tugs will be the eighth and ninth Robert Allan designs in five years for Houston-based Signet Maritime.
The tugs feature Caterpillar C175-16 Tier 3 engines, each rated at 3,417 hp, Rolls-Royce US 255 controllable-pitch Z-drives, and a pair of 110″-dia. 4-bladed nibral wheels in Kortnozzles. The package will give the tugs 83 tons of bollard pull ahead and 75 tons astern. Each tug will have an electric Markey DEPCF-52S electric hawser winch and a Markey TESD-34 electric towing winch.
The firefighting system features two FFS SFP pumps, driven off the front of the main engines and two FFS 1200LB remotely operated monitors. The pumping capacity is 5,300 gpm with a range of 400′. The tugs are classed FiFi 1. The pilothouse glass is fire resistant.
Each tug has tankage for 86,000 gals. of fuel oil, 21,000 gals. ballast and 3,760 gals. potable water.
For service power, the tugs will be outfitted with pairs of John Deere 6068TFM76-powered, 125-kW generators. The tugs’ height of eye is 26’4″.
Project manager Ashley Stone said the Signet Arcturus is the first Subchapter I tug in this size range. Usually, Subchapter I tugs are much larger. “It is a very small vessel to have this classification. We’ll have automation, a safe manning certificate, and a lot of SOLAS features that bigger tugs have.”
Signet essentially took the hull of the 108’×40′ Signet Weatherly that they built last year with MTU engines and Niigata Z-drives and swapped in the Cat C175s with Rolls-Royce Z-drives, Stone said. “They added a control room as well so they have full monitoring and control.”
Also, the Weatherly had only one fire pump and was not FiFi 1 classed.
The ASD tugs will operate from the International Operations Center in Ingleside, Texas, where they will primarily be used to perform offshore and inshore rig escort, barge and subsea support work
The Signet Arcturus is due for delivery in December. The Signet Polaris will follow in March 2014. Patti is also busy working on a crane barge for the Corps of Engineers Memphis, Tenn., district.
“I have a lot of bids out right now,” Stone said. “Business is really doing well right now.”
Yard president Frank Patti Jr. agreed. “We like what is going on now, and we’d like to do more of the same. Building nice tugs like this is right up our alley.”