AASHTO M 252-20 pdf free download

AASHTO M 252-20 pdf free download.Corrugated Polyethylene Drainage Pipe.
5.1 .3. Diameter and length required, either total length or length of each piece and number of pieces; Note 2—Type C and CP pipe less than 200 mm (8 in.) in diameter may be supplied coiled; coiling of Type C and CP pipe 200 mm (8 in.) in diameter or greater is not recommended; Type S and SP pipe is not supplied in coils.
5.1.4. Number of couplings;
5.1.5. For Type SP pipe, class of perforations (Class 2 is furnished if not specified) (Section 7.4); and
5.1.6. Certification, if desired (Section 12.1).
6. MATERIALS
6.1. Basic Materials:
6.1.1. Extruded Pipe and Blow Molded Fittings—Pipe and fittings shall be made of virgin PE resin compounds meeting the requirements of ASTM D3350 and cell classification 424420C, except that the carbon black content shall not exceed 5 percent when tested in accordance with D42 18. Resins that have higher cell classifications in one or more properties are acceptable provided product requirements are met.
6.1 .2. Rotational Molded Fittings and couplings—Fittings and couplings shall be made of virgin PE resins meeting the requirements of ASTM D3350 and cell classification 2l3320C, except that the carbon black content shall not exceed 5 percent when tested in accordance with D4218. Resins that have higher cell classifications in one or more properties are acceptable provided product requirements are met.
6.1 .3. Injection Molded Fittings and couplings—Fittings and couplings shall be made of virgin PE resins meeting the requirements of ASTM D3350 and cell classification 314420C, except that the carbon black content shall not exceed 5 percent when tested in accordance with D42 18. Resins that have higher cell classifications in one or more properties are acceptable provided product requirements are met.
6.2. Reworked Material—In lieu of virgin PE, clean reworked material may be used, provided that it meets the cell class requirements as described in Section 6.1.
7. REQUIREMENTS
7.1. Workmanship—The pipe and fittings shall be free of foreign inclusions and visible defects as defined herein. The ends of the pipe shall be cut squarely and cleanly so as not to adversely affect joining or connecting.
7.1 .1. Visible Defects—Cracks, creases, delamination, and unpigmented or non-uniformly pigmented pipe are not permissible in the pipe or fittings as furnished. There shall be no evidence of cracking or delamination when tested in accordance with Section 9.2.
7.1.2. Liner—For Type S and SP pipe, the liner shall be fused to the outer corrugated wall at all internal corrugation crests.
7.2. Pipe Dimensions:
7.2.1. Nominal Size—The nominal size for the pipe and fittings is based on the nominal inside diameter of the pipe. Nominal diameters shall be sized for Type C and CP pipe in not less than 25-mm (1 in.) increments from 75 to 250 mm (3 to 10 in.). Nominal sizes shall be sized for Type S and SP pipe in not less than 50-mm (2 in.) increments from 100 to 250 mm (4 to 10 in.).
7.2.2. Liner Thickness—For Type S and SP pipe, the liner shall have a minimum thickness of 0.5 mm (0.02 in.) for pipe of 100 mm (4 in.) and 150 mm (6 in.) nominal size and a minimum thickness of 0.6 mm (0.025 in.) for pipe of 200 mm (8 in.) and 250 mm (10 in.) nominal size, when measured in accordance with Section 9.5.4.
7.2.3. Inside Diameter Tolerances—The tolerance on the specified inside diameter shall be +4.5, —1.5 percent when measured in accordance with Section 9.5.1.
7.2.4. Length—Corrugated PE pipe is an extruded product and may be sold in any length agreeable to the user. Lengths shall not be less than 99 percent of the stated quantity when measured in accordance with Section 9.5.2.
7.3. Fitting aiitl Coupling Dimensions:
7.3.1. The maximum allowable gap between fitting or coupling and pipe shall not exceed 3 mm (0.1 in.) unless otherwise specified.
7.3.2. All fittings and couplings shall be within an overall length dimensional tolerance of±12 mm (0.5 in.) of the manufacturer’s specified dimensions.AASHTO M 252-20 pdf download.