The ADS N-12 WT IB (per AASHTO) Specification document covers pipe requirements, joint performance, fittings, material properties, installation information & BABA information for this product.

Pipe requirements for the N-12 WT IB (per AASHTO) include a smooth interior and annular exterior corrugations,. 4”-10” (100 to 250 mm) pipe shall meet AASHTO M252, Type S, 12”- 60” (300 to 1500 mm) pipe shall meet AASHTO M294, Type S, or ASTM F2306, and Manning’s “n” value for use in design shall be 0.012.

Pipe shall be joined using a bell & spigot joint meeting the requirements of AASHTO M252, AASHTO M294, or ASTM F2306. The joint shall be watertight according to the requirements of ASTM D3212. Gaskets shall meet the requirements of ASTM F477. See the specifications document for gasket & joint lubricant information.

Fittings need to conform to AASHTO M252, AASHTO M294, or ASTM F2306. Bell and spigot connections will utilize a welded bell and valley or saddle gasket meeting the watertight joint performance requirements of AASHTO M252, AASHTO M294, or ASTM F2306.

To assure watertightness, field performance verification may be accomplished by testing in accordance with ASTM F2487.

Material for pipe and fitting production is high density polyethylene conforming with the minimum requirements of cell classification 424420C for 4”-10” (100 to 250 mm) diameters, and 435400C for 12”-60” (300 to 1500 mm) diameters, as defined and described in the latest version of ASTM D3350, except that carbon black content should not exceed 4%. The 12”-60” (300 to 1500 mm) pipe material shall comply with the notched constant ligament-stress (NCLS) test as specified in Sections 9.5 and 5.1 of

AASHTO M294 and ASTM F2306, respectively.

Installation is in accordance with ASTM D2321 and ADS recommended installation guidelines, with the exception that minimum cover in trafficked areas for 4”-48”(100 to 1200 mm) diameters shall be one foot. (0.3 m) and for 60” (1500 mm) diameter the minimum cover shall be 2 ft. (0.6 m) in single run

applications. Refer to Technical Note 2.01 for more information. A Pipe Dimensions table is included for reference.

N-12® ST IB Pipe (per AASHTO) is manufactured in accordance with AASHTO M252, AASHTO M294 or ASTM F2306, and complies with the requirements in the Build America, Buy America (BABA) Act.