1、Standard Specification for Corrugated Polyethylene Drainage Pipe AASHTO Designation: M 252-18 Technical Section: 4b, Flexible and Metallic Pipe Release: Group 2 (June) American Association of State Highway and Transportation Officials 444 North Capitol Street N.W., Suite 249 Washington, D.C. 20001TS
2、-4b M 252-1 AASHTO Standard Specification for Corrugated Polyethylene Drainage Pipe AASHTO Designation: M 252-18 Technical Section: 4b, Flexible and Metallic Pipe Release: Group 2 (June) 1. SCOPE 1.1. This specification covers the requirements and methods of test for corrugated polyethylene (PE) pip
3、e, couplings, and fittings for use in subsurface drainage systems, storm sewers, and in surface drainage (culverts), where soil support is given to the pipes flexible walls in all applications. 1.1.1. Nominal sizes of 75 to 250 mm (3 to 10 in.) are included. 1.1.2. Materials, workmanship, dimensions
4、, pipe stiffness, environmental stress-crack resistance, perforations, joining systems, brittleness and form of markings are specified. Note 1When PE pipe is to be used in locations where the ends may be exposed, consideration should be given to combustibility of the PE and the deteriorating effects
5、 of prolonged exposure to ultraviolet radiation. 1.2. UnitsThe values stated in SI units are to be regarded as standard. Within the text, the U.S. Customary units are shown in parentheses, and may not be exact equivalents. 1.3. The following precautionary caveat pertains only to the test method port
6、ion, Section 9.3 of this specification. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limi
7、tations prior to use. 2. REFERENCED DOCUMENTS 2.1. ASTM Standards: D618, Standard Practice for Conditioning Plastics for Testing D883, Standard Terminology Relating to Plastics D1693, Standard Test Method for Environmental Stress-Cracking of Ethylene Plastics D2122, Standard Test Method for Determin
8、ing Dimensions of Thermoplastic Pipe and Fittings D2412, Standard Test Method for Determination of External Loading Characteristics of Plastic Pipe by Parallel-Plate Loading D3350, Standard Specification for Polyethylene Plastics Pipe and Fittings Materials D4218, Standard Test Method for Determinat
9、ion of Carbon Black Content in Polyethylene Compounds by the Muffle-Furnace Technique F405, Standard Specification for Corrugated Polyethylene (PE) Pipe and Fittings (withdrawn 2015) F412, Standard Terminology Relating to Plastic Piping Systems 2018 by the American Association of State Highway and T
10、ransportation Officials. All rights reserved. Duplication is a violation of applicable law.TS-4b M 252-2 AASHTO 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. bucklingDuring pipe flatte
11、ning testing, any decrease or downward deviation in the pipe load-deflection test curve shall be considered a buckling point. 3.3. crackany break or split that extends through the wall or liner. 3.4. creasea visible irrecoverable indentation. 3.5. reworked materiala plastic from a processors own pro
12、duction that has been reground, pelletized, or solvated after having been previously processed by molding, extrusion, etc. (ASTM D883). 3.6. delaminationA separation between the liner and outer corrugated wall of Type S pipe as evidenced by a visible gap extending completely through at least one cor
13、rugation valley at any point around the circumference of the pipe. 4. CLASSIFICATION 4.1. The corrugated PE pipe covered by this specification is classified as follows: 4.1.1. Type CThis pipe shall have a full circular cross section, with a corrugated surface both inside and outside. Corrugations ma
14、y be either annular or helical. 4.1.1.1. Type CPThis pipe shall be Type C with Class 2 perforations. 4.1.2. Type SThis 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 availab
15、le in nominal sizes of less than 100 mm (4 in.). 4.1.2.1. Type SPThis pipe shall be Type S with either Class 1 or Class 2 perforations. 4.2. Class 1 and Class 2 perforations are as described in Sections 7.4.1 and 7.4.2. 5. ORDERING INFORMATION 5.1. Orders using this specification shall include the f
16、ollowing information as necessary to adequately describe the desired product: 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 2Type C and CP pipe less than 200
17、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; 2018 by the American Association of State Highway and Transportation Officials. All rights r
18、eserved. Duplication is a violation of applicable law.TS-4b M 252-3 AASHTO 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 Molde
19、d FittingsPipe 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 D4218. Resins that have higher cell classifications in one or
20、more properties are acceptable provided product requirements are met. 6.1.2. Rotational Molded Fittings and CouplingsFittings and couplings shall be made of virgin PE resins meeting the requirements of ASTM D3350 and cell classification 213320C, except that the carbon black content shall not exceed
21、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 CouplingsFittings and couplings shall be made of virgin PE resins meeting the requirements
22、 of ASTM D3350 and cell classification 314420C, 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. 6.2. Reworked MaterialIn
23、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. WorkmanshipThe pipe and fittings shall be free of foreign inclusions and visible defects as defined herein. The ends of the pipe shall be cut s
24、quarely and cleanly so as not to adversely affect joining or connecting. 7.1.1. Visible DefectsCracks, 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
25、 accordance with Section 9.2. 7.1.2. LinerFor 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 SizeThe nominal size for the pipe and fittings is based on the nominal inside diameter of the pipe. Nominal
26、 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 ThicknessFor Type S and SP pipe, th
27、e 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. 2018 by the American Assoc
28、iation of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.TS-4b M 252-4 AASHTO 7.2.3. Inside Diameter TolerancesThe tolerance on the specified inside diameter shall be +4.5, 1.5 percent when measured in accordance with Section 9.5.1. 7.2.
29、4. LengthCorrugated 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 and Coupling Dimensions: 7.3.1. The maximum allowable gap between fitt
30、ing 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 manufacturers specified dimensions. 7.4. PerforationsWhen perforated pipe is specified, the perfora
31、tions shall conform to the requirements of Class 2, unless otherwise specified in the order. Class 1 perforations are for pipe intended to be used for subsurface drainage or combination storm and underdrain. Class 2 perforations are for pipe intended to be used for subsurface drainage only. The perf
32、orations shall be cleanly cut so as not to restrict the inflow of water. Where circular perforations are preferred, the drill shall not penetrate the side walls of the corrugations. Pipe connected by couplings or bands may be unperforated within 100 mm (4 in.) of each end of each length of pipe. Not
33、e 3Pipe ordered under Class 1 perforations has no requirement as to inlet area because it specifies size, number, and location of holes. Alternate perforation patterns should be agreed to between the purchaser and manufacturer. 7.4.1. Class 1 PerforationsThe perforations shall be approximately circu
34、lar and shall have nominal diameters of not more than 5 mm (0.2 in.) for 100- and 150-mm (4- and 6-in.) diameter pipe and not greater than 10 mm (0.4 in.) for 200- and 250-mm (8- and 10-in.) diameter pipe. The holes shall be arranged in rows parallel to the axis of the pipe. The location of the perf
35、orations shall be in the valley of the outside corrugation and in each corrugation. The rows of perforations shall be arranged in two equal groups placed symmetrically on either side of the lower unperforated segment corresponding to the flow line of the pipe. The spacing of the rows shall be unifor
36、m. The distance of the centerlines of the uppermost rows above the bottom of the invert and the inside chord lengths of the unperforated segments illustrated in Figure 1 shall be as specified in Table 1. All measurements shall be made in accordance with Section 9.5.3. 2018 by the American Associatio
37、n of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.TS-4b M 252-5 AASHTO Table 1Rows of Perforations, Height H of the Centerline of the Uppermost Rows above the Invert, and Chord Length L of Unperforated Segment, for Class 1 Perforations
38、 Nominal Diameter, mm (in.) Rows of PerforationsaH, Max,b,mm (in.) L, Min,bmm (in.) 75 (3) 2 35 (1.4) 50 (2) 100 (4) 2 45 (1.75) 65 (2.5) 150 (6) 4 70 (2.75) 95 (3.75) 200 (8) 4 94 (3.7) 130 (5.1) 250 (10) 4 120 (4.7) 160 (6.3 aMinimum number of rows. A greater number of rows for increased inlet are
39、a shall be subject to agreement between purchaser and manufacturer. Note that the number of perforations per meter in each row (and inlet area) is dependent on the corrugation pitch. bSee Figure 1 for location of dimensions H and L. Figure 1Requirements for Perforations 7.4.2. Class 2 PerforationsCi
40、rcular and slotted perforations shall conform to the maximum dimensions as shown in Table 2. Perforations shall be placed uniformly in the outside valleys of the corrugations. The water inlet area shall be a minimum of 20 cm2/m (1 in.2/ft) of pipe. All measurements shall be made in accordance with S
41、ection 9.5.3. Table 2Maximum Perforation Dimensions Nominal Pipe Diameter, mm (in.) Drilled Hole Diameter, mm (in.) Slotted Holes Width, mm (in.) Length, mm (in.) 75 (3) 4.75 (0.19) 3 (0.12) 25 (1) 100 (4) 4.75 (0.19) 3 (0.12) 25 (1) 150 (6) 4.75 (0.19) 3 (0.12) 25 (1) 200 (8) 6.25 (0.25) 3 (0.12) 3
42、0 (1.2) 250 (10) 8.00 (0.3) 3 (0.12) 30 (1.2) 2018 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.TS-4b M 252-6 AASHTO 7.5. Pipe StiffnessType C pipe, as described in Section 4.1.1, shall have a minimum pip
43、e stiffness (PS) of 240 kPa (35 psi) at 5 percent deflection; and Type S pipe, as described in Section 4.1.2, shall have a minimum PS of 340 kPa (50 psi) at 5 percent deflection when tested in accordance with Section 9.1. The pipe tested shall contain perforations, if specified. 7.6. Pipe Flattening
44、There shall be no visual evidence of buckling (a decrease or downward deviation in the load-deflection curve), cracking, splitting, or delamination when the pipe is tested in accordance with Section 9.2. 7.7. Environmental Stress CrackingThere shall be no cracking of the pipe when tested in accordan
45、ce with Section 9.3. 7.8. BrittlenessThere shall be no cracking of the pipe wall or liner when tested in accordance with Section 9.4 except as specified in Sections 7.8.1 and 7.8.2. Note 4The brittleness test is similar to that described in ASTM F405. 7.8.1. Cracks with a maximum chord length of 10
46、mm (0.4 in.) that originate at a perforation or at either end of the sample shall not be cause for rejection. 7.8.2. Splitting along a seam or mold parting line is not caused by brittleness and should be evaluated as a workmanship defect as described in Section 7.1.1 if no split exceeds 50 mm (2 in.
47、) in chord length. 7.9. Fitting and Coupling Requirements: 7.9.1. The fittings and couplings shall not reduce or impair the overall integrity or function of the pipe line. 7.9.2. Common corrugated fittings include reducers, tees, wyes, and end caps. Note 5Only fittings and couplings supplied or reco
48、mmended by the pipe manufacturer should be used. 7.9.3. Fittings and couplings shall not reduce the inside diameter of the pipe being joined by more than 5 percent of the nominal inside diameter. Reducer fittings shall not reduce the cross-sectional area of the smaller size. 7.9.4. Pipe connected by
49、 in-line couplers shall not separate when tested in accordance with Section 9.6.1. 7.9.5. The coupling shall not crack or crease when tested in accordance with Section 9.6.2. 7.9.6. The design of the couplers shall be such that when connected with the pipe, the axis of the assembly will be level and true when tested in accordance with Section 9.6.3. 8. CONDITIONING 8.1. ConditioningCondition the specimen prior to test at 23 2C (73.4 3.6F) for not less than 24 hours in accordance with Procedure A in ASTM D618 for those
