53 Pa. Stat. § 16999.4
The city is hereby authorized to issue bonds for the purpose of financing or refunding the cost of a project or any part thereof or of two or more projects combined for any one municipal utility and to issue its refunding bonds for the purpose of refunding any outstanding bonds issued under this act, all in accordance with and subject to the provisions and limitations of this act. The bonds shall not pledge the credit or taxing power nor create any debt or charge against the tax or general revenues of the city but shall be payable solely from utility revenues designated by the city and proceeds of bonds, nor create any lien against any property of the city, other than the aforesaid utility revenues. The bonds shall be authorized by ordinance which shall set forth the maximum amount of bonds which may be outstanding at any one time for any one municipal utility and the sources of payment for the bonds. Ordinances enacted pursuant to this act shall be enacted in accordance with the procedural laws applicable to the city.
53 P.S. § 16999.4