AASHTO M 252:2018 Standard Specification for Corrugated Polyethylene Drainage Pipe.
3. TERMINOLOGY
3.1. The terminology used in this standard is in accordance with the definitions given in ASTM D883 and ASTM F412 unless otherwise specified.
3.2. buckling—During pipe flattening testing, any decrease or downward deviation in the pipe loaddeflection test curve shall be considered a buckling point.
3.3. crack—any break or split that extends through the wall or liner.
3.4. crease—a visible irrecoverable indentation.
3.5. reworked material—a plastic from a processor’s own production that has been reground, pelletized, or solvated after having been previously processed by molding, extrusion, etc.
(ASTM D883).
3.6. delamination—A separation between the liner and outer corrugated wall of Type S pipe as evidenced by a visible gap extending completely through at least one corrugation valley at any point around the circumference of the pipc.
4. CLASSIFICATION
4.1 . The corrugated PE pipe coi’ered by this spec qicatioii is classified as follows:
4.1.1. Type C—This pipe shall have a full circular cross section, with a corrugated surface both inside and outside. Corrugations may be either annular or helical.
4.1.1 .1. Type CP—This pipe shall be Type C with Class 2 perforations.
4.1 .2. Type S—This pipe shall have a full circular cross section, with an outer corrugated pipe wall and a smooth inner liner. Corrugations may be either annular or helical. Type S pipe is not available in nominal sizes of less than 1 00 mm (4 in.).
4.1 .2.1. Type SP—This pipe shall be Type S with either Class I or Class 2 perforations.
4.2. Class I and Class 2 perforations are as described in Sections 7.4. 1 and 7.4.2.
5. ORDERING INFORMATION
5. 1 . Orderc using this specification shall include the ollowing information as necessary to adequately describe the desired prodtu 1:
5.1.1. AASHTO designation and year of issue;
5.1 .2. Type of pipe (Section 4.1);
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.AASHTO M 252 pdf download.