(a) All joints and connections shall be made gastight and watertight. Cast iron pipe joints shall be firmly packed with oakum or hemp and filled with molten lead, Federal Specification (QQ-L-156), not less than one inch deep. Lead shall be run in one pouring and caulked tight. No paint, varnish, or other coatings shall be permitted on the jointing material until after the joint has been tested and approved.
(b) All joints in vitrified clay pipe or between such pipe and metals shall be made with approved hot-poured jointing material or cement mortar as specified below.
(c) Material for hot-poured joints shall not soften sufficiently to destroy the effectiveness of the joint when subjected to a temperature of 160° F. and shall not be soluble in any of the wastes carried by the drainage system. The joint shall first be caulked tight with jute, hemp, or similar approved material.
(d) Cement joints shall be made by packing a closely twisted jute or oakum gasket of suitable size to partly fill the annular space between the pipes. The remaining space shall be filled and firmly compacted with mortar composed of one part Portland cement and three parts mortar sand. The material shall be mixed dry; however, sufficient water shall be added to make the mixture workable. Mortar which has begun to set shall not be used or retempered. Lime putty or hydrated lime may be substituted to the extent of not more than twenty-five percent (25%) of the volume of the Portland cement that may be added.
(e) Other jointing materials and methods may be used only on approval of the Superintendent. (1980 Code. Sec. 50.45)