NEW YORK (Standard&Poor's) Feb. 12, 2003--Standard&Poor's Ratings Services today assigned its 'BBB' rating to energy services company Enterprise Products Operating L.P.'s $500 million senior unsecured notes due in 2033. Parent company Enterprise Products Partners remains on CreditWatch with negative implications. Houston, Texas-based Enterprise Products Partners has about $2.1 billion of debt as of January 2003. Proceeds of the offering are expected to be used to retire a portion of the acquisition bridge loan of $1.2 billion that was used to acquire the Mid-America Pipeline Co. and the Seminole Pipeline Co. from affiliates of the Williams Companies Inc. Standard&Poor's placed the ratings of Enterprise Products Partners on CreditWatch with negative implications in August 2002. This