NEW YORK--(BUSINESS WIRE)--Fitch Ratings has assigned a 'BBB+' rating to the following revenue bonds issued by the city of Philadelphia on behalf of the Philadelphia Gas Works (PGW): --Approximately $274,395,000 Gas Works Revenue Refunding Bonds, Thirteenth Series (1998 General Ordinance). The bonds are scheduled to price via negotiation Aug. 4. The bonds will refund all bonds currently outstanding under the General Gas Works Revenue Bond Ordinance of 1975 (effectively terminating the lien), re