HDPE Pipe Details: a) SCOPE This specification describes 4- through 60-inch (100 to 1500 mm) ADS N-12 ST IB pipe (per ASTM F2648) for use in gravity-flow land drainage applications. b) Pipe Requirements ADS N-12 ST IB pipe (per ASTM F2648) shall have a smooth interior and annular exterior corrugations. ● 4-through 60-inch (100 to 15000 mm) shall meet ASTM F2648 ● Manning’s “n” value for use in design shall be 0.012 c) Joint Performance Pipe shall be joined using a bell & spigot joint meeting ASTM F2648. The joint shall be soil-tight and gaskets, when applicable, shall meet the requirements of ASTM F477. Gaskets shall be installed by the pipe manufacture and covered with a removable wrap to ensure the gasket is free from debris. A joint lubricant supplied by the manufacturer shall be used on the gasket and bell during assembly. d) Fittings Fittings shall conform to ASTM F 2306. Bell and spigot connections shall utilize a spun-on or welded bell and valley or saddle gasket meeting the soil-tight joint performance requirements of ASTM F2306 e) Material Properties Material for pipe production shall be engineered compound of virgin and recycled high density polyethylene conforming with the minimum requirements of cell classification 424420C (ESCR Test Conditions) ● For 4- through 10-inch (100 to 250 mm) diameter, and 435420C (ESCR Test Condition B) ● For 12- through 60-inch (300 to 1500 mm) diameters, as defined and described in the latest version of ASTEM D3350, except that carbon black content should not exceed 4%. The design engineer shall verify compatibility with the overall system including structural, hydraulic, material and installation requirements for a given application. f) Installation Installation shall be in accordance with ASTEM D2321 and ADS recommended installation guidelines, with the exception that minimum cover in trafficked areas for 4-through 48-inch (100 to 1200 m diameters shall be one (1) foot (0.3 m) and for 60-inch (1500 mm) diameters, the minimum cover shall be two (2) feet (0.6 m) in single run applications. Backfill for minimum cover situations shall consist of Class 1 (compacted), or Class 2 (minimum 90% SPD) material. Maximum fill heights depend on embedment material and compaction level
