All service and other pipes used in conjunction with the sewer services of the city shall be of such material, quality and specifications as the city council may from time to time by resolution provide and shall be installed at such distances below ground as may be specified by regulations relating to the sewer department. All work, alterations or extensions affecting sewer pipes shall be subject to the acceptance of the sewer superintendent, and no connections with sewer mains shall be made without first obtaining a permit therefor from the recorder. (Prior code § 14-226)