Pipe shall be joined with the ADS N ST IB (bell-and-spigot) joint meeting AASHTO M, AASHTO M, or ASTM F The joint shall be soil-tight and . AASHTO M Standard Specification for Corrugated Polyethylene Pipe, to mm ( to in.) Diameter. standard by American Association of. Corrugated Polyethylene Pipe, to mm Diameter. Scope. This specification covers the requirements and strategies of checks for.
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Not a MyNAP member yet? Register for a free account to start saving and receiving special member only perks. Below is the uncorrected machine-read text of k294 chapter, intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text of each book. Commentary is shown in the margins of the standard.
Group 2 June Group 2 June 1. This specification covers aashot requirements and methods of tests for corrugated polyethylene PE pipe, couplings, and fittings for use in surface and subsurface drainage applications.
Nominal sizes of to mm 12 to 60 in. Materials, workmanship, dimensions, pipe stiffness, slow crack growth resistance, joining systems, brittleness, and form of markings are specified. Corrugated PE pipe is intended for surface and subsurface drainage applications where soil provides support to its flexible walls.
Its major use is to collect or convey drainage water by open gravity flow, as culverts, storm drains, etc.
Within the text, the U. Customary units are shown in parentheses, and may not be exact equivalents. This specification does not include requirements for bedding, backfill, or earth cover load. Successful performance of this product depends upon proper type of bedding and backfill, and care in installation.
Upon request of the user or engineer, the manufacturer shall provide profile wall section detail required for a full engineering evaluation. The following precautionary caveat pertains only to the test method portion, Section 9.
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 limitations prior to use. Proquest Publishing, Villanova University. The deflection limit is expressed as a percentage reduction of the inside diameter.
For Type D pipe, delamination is a separation of the liner and outer wall as evidenced by a visible gap extending completely between the internal supports and liner or outer wall at any point around the circumference of the pipe. A stress crack is an external or internal crack in plastic caused by tensile stresses less than its short-time mechanical strength. The slow crack growth mechanism is comprised of a crack initiation phase and a crack propagation phase.
The corrugated PE pipe covered by this specification is classified as follows: Corrugations shall be annular. Two classes of perforations are as described in Sections 7. Orders using this specification shall include the following information, as necessary, to adequately describe the desired product: Type of pipe Section 4.
Diameter and length required, either total length or length of each piece and number of pieces; 5. Number of couplings; 5. Class of perforations Class 2 is furnished if not specified Section 7. Certification, if desired Section The cell classification shall be based on the PE resin compounds without carbon black. Resins that have higher cell classifications in one or more properties, with the exception of density, are acceptable provided product requirements are met.
For slow crack growth resistance, the requirements in 6. To ensure adequate resistance to SCG propagation, NCLS testing shall be conducted on specimens taken either directly from the finished pipe liner or from ground-up pieces of pipe that have been compression-molded into a plaque.
The minimum UCLS failure time shall be prescribed based on the service conditions temperature and factored design stress and desired service life as detailed in A2 of the Annex. For this condition, the average UCLS failure time for five mm294 shall not be less than 34 hrs. Density of pipe compounds containing recycled materials should be conducted by the ultrasound technique in accordance with ASTM D since ultrasonic density is not affected by colorants and other inorganic compounds that may be present in these materials.
Resins that have higher cell classifications in one or more properties are acceptable provided product requirements are met. The ends of the pipe shall be cut squarely and cleanly so as not to adversely affect joining or connecting. There shall be no evidence of delamination when tested in accordance with Section 9. Nominal diameters shall be,,,and mm 12, 15, 18, 21, 24, 27, 30, 36, 42, 48, 54, and 60 in.
Lengths shall not aasht less than 99 percent of the stated quantity when measured in accordance with Section 9. Class 1 perforations are for pipe intended to be used for subsurface drainage or combination storm and underdrain.
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Class 2 perforations are for pipe intended to be used for subsurface drainage only. The perforations shall be cleanly cut so as not to restrict the inflow of water.
Pipe connected by couplings or bands may be unperforated within mm 4 in. Pipe connected by bell and spigot joints may not be perforated in the area of the bells and spigots. Liner Thickness, Mina, aashtl in.
Rows of Perforationsa H, Max,b mm in. L, Min,b mm in. For Type CP and SP pipe, the perforations shall be located in the external valleys with perforations in each row for each corrugation. The perforations shall not cut into the corrugation sidewalls.
For Type DP pipe, perforations shall be located azshto the center of the cells. The perforations shall not cut into the vertical sections of the cells. 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 uniform.
The distance between the centerlines of the rows shall not be less than 25 mm 1 in. The minimum number of longitudinal rows of perforations, the maximum height of the centerlines of the uppermost rows of perforations 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.
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The width of slots shall not exceed 3 mm 0. The length of slots shall not exceed 70 mm 2. Perforations aasht be uniformly spaced along the length and circumference of the pipe. All measurements shall be made in accordance with Section 9.
Pipe Stiffness, kPa psi 12 50 15 42 18 40 21 38 24 34 27 30 a 30 29 a 36 azshto A greater number of rows for increased inlet area 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. Additionally, pipe specimens shall not exhibit a decrease or downward deviation in the load-deflection curve prior to the buckling deflection limit calculated in Section 9.
Five nonfailures out of six impacts will be acceptable. The stub compression test, AASHTO Tshall be a material and wall design qualification test conducted twice a sashto or whenever there are changes in wall design or material distribution. Computing the minimum capacity requires determining the cross-sectional area of the pipe wall.
This can be accomplished conveniently by optically scanning the profile and determining the section properties using a computer drafting program.
The fittings shall not reduce or impair the overall integrity or function of the pipe line. Common corrugated fittings include in-line azshto fittings, such as couplings and reducers, and branch or complementary assembly fittings such as tees, wyes, and end caps. These fittings are installed by various methods. Fittings shall not reduce the inside diameter of the pipe zashto joined by more than 12 mm 0.
Reducer fittings shall not reduce the cross-sectional area of the small size. Couplings shall be corrugated to match the pipe corrugations and shall provide sufficient longitudinal strength to preserve pipe alignment and prevent separation at the joints. Couplings shall be bell and spigot or split collar. Split couplings shall engage at least two full corrugations on each pipe section.
The design of the fittings 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. Other types of coupling bands or fastening devices that are equally effective as those described, and that comply with the joint performance criteria of AASHTO LRFD Bridge Construction Specifications, Section 30, may be used when approved by the purchaser.
Only fittings supplied or recommended by the pipe manufacturer shall be used. Fabricated fittings shall be manufactured from pipe meeting the requirements of this specification and all seams must be completely sealed with compatible PE material. Fabricated aawhto shall be supplied with joints compatible with the overall system. Soiltight joints are specified as a function of opening size, channel length, and backfill particle size. If the size of the opening exceeds 3 mm 0.
Corrugated Polyethylene Pipe AASHTO M —
A backfill material containing a high percentage of fine-graded soils requires investigation for the specific type of joint to be used to guard against soil infiltration. Silt-tight joints should be used where the backfill material has a high percentage of fines.
Silt-tight joints must be designated to pass a laboratory pressure test of at least 14 kPa 2 psi. Watertight joints must meet a 74 kPa The specimen must lie n294 on the plate within 3 mm 0. Use the first location azshto a reference point for rotation and testing of the other specimen. Rotate the second specimen 90 degrees from the orientation of the first specimen and test.
The point shall be considered as the 0. The rate of loading shall be the same as in ,294 9. The buckling deflection limit shall be determined by the following equation: J which simplifies to: