Corrugated Polyethylene Drainage Pipe AASHTO std M252-09 (part 1)

Agustus 8, 2020 by admin in Events, Industry News, Tips

Corrugated Polyethylene Drainage Pipe

Standard Specification by AASHTO Designation: M 252-09

4. Classification

4.1. The Corrugated polyethylene pipe covered by this specification as follow:
4.1.1. Type C–This pipe shall have a full circular cross section, with a corrugated surface both inside and outside. Corrugation 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 section, with an outher 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 100mm.
4.1.2.1. Type SP–This pipe shall be Type S with either Class 1 or Class 2 perforations.
4.2. Class 1 and Class 2 perforations are as discribed in sections 7.4.1 and 7.4.2.

7. Requirements

7.1 Workmanship–The pipe and fittings shall be free of foreign inclusions and visible defects as define 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 Deffects– Cracks, creases, unpingmented or nonuniformly pigmented pipe are not permissible.
7.1.2. Inner Liner– for Type S and SP pipe, the inner liner shall be fused to the outer corrugated wall at all internal corrugatetion crests.
7.2 Pipe Dimensions :
7.2.1. Normal Size–the nominal size for the pipe and fittings is based on the nominal inside diameter of the pipe. Nominal diameter shall be sized for TypeC and CP pipe in not less than 25mm. increments from 75 to 250mm. Nominal sizes shall be sized for S and SP pipe in not less than 50mm increments from 100 to 250mm.
7.2.2. Inner Liner–for Type S and SP pipe, the inner liner shall have a minimum thickness of 0,5mm for pipe of 100mm and 150mm nominal size and a minimum thickness of 0,6mm for pipe of 200mm and 250mm nominal size, when measured in accordance with a digital micrometer or ultrasonic thicness gauge in accordance with ASTM D 2122.
7.2.3 Inner Diameter Tolerances–The tolerance on the specified inside diameter shall be +4.5, -1.5 percent when measured in accordance with ASTM D 2122. Alternatively, measure the inside diameter of two sections, with a suitable device accurate to ≠0.2mm the mold partline and 90degrees to it, and average the measurements.
7.2.4. Length–Corrugated PE pipe is an extuded and may be sold in any length agreeable to the user. Length not be less than 99percent of the stated quantity when measured in accordance with any suitable device accurate to 0.2percent. Make all measurements on the pipe while it is stress-free and at rest on a flat surface in a straight line. The length measurement may be taken at ambient temperature.

to be continued to part 2.

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