The Maritime Administration has increased its Title XI loan guarantee commitment on an integrated CATUG tug/barge tanker unit owned by Second Tug Barge Corp. from $53,782,000 to $62,790,000.

The increase of $10,296,000 was caused by additional construction interest on the vessel between the time of MarAd's initial commitment and the closing date of the guarantee agreement. The guarantee covers approximately 87 1/2 percent of the vessel's $71,761,000 actual cost. The vessel is expected to be delivered in October 1982.