Specifications include, but are not limited to: Pipes, couplings, and fittings shall be made of polyethylene compounds, and shall meet all applicable requirements of AASHTO M294 Type S or Type C (as applicable) for pipe sizes 12” and larger. Polyethylene pipes, couplings and fittings less than 12" in diameter shall meet the requirements of AASHTO M252. The pipes and fittings shall be free of foreign inclusions and visible defects and pipe shall be cut squarely and cleanly so as to not adversely affect joining or connecting. Visible defects such as cracks, creases, unpigmented or non-uniformly pigmented pipe are not permissible in the pipe, couplings, or fittings as furnished. Joints for all pipe and fittings shall use gasketed watertight bell/spigot or bell/bell couplers. The gaskets shall meet the requirements of ASTM F477 and the joint system shall be certified to meet a 10.8 psi laboratory test per ASTM D3212. In addition, the joint system shall provide sufficient longitudinal strength to preserve pipe alignment and prevent separation at the joint.
