1904 - CORRUGATED METAL PIPE AND END SECTIONS 1900-8
1904.1 Description
This specification governs corrugated steel pipe, arches, corrugated aluminum alloy pipe, arches, and the associated end sections and accessory items for use in drainage systems and other applications.
1904.2 Requirements
a. General . Provide pipe, arches, end sections, and acce ssory items that comply with the design, dimensions, alloy designation and thermal treatment, requirement for supplemental corrosion protection, and specific fabrication requirements as specified or in the Contract Documents. The components of pipe systems are to comply with subsection 1904.2b. The selected specification(s) is (are) denoted in the Contract Documents. b. Material Specifications.
1.Comply all corrugated steel (g alvanized and aluminized) pipe, pipe -arches, and accessory items with AASHTO M 36. Comply all steel sheet utilized to fabr icate the pipe and pipe-arc hes with AASHTO M 218 when zinc coated, or AASHTO M 274 when aluminum alloy coated. The type of pipe, and type and class of coating will be specified in the Contract Documents. Provide only continuous helical (lock or welded) seams. Do not interconnect components with differing coating types within a piping system.
2.Comply all corrugated aluminum alloy pipe, pipe-arches, and accessory items with AASHTO M 196. The type of pipe will be specified in the Contract Documents. Provide only continuous helical lock seams. Do not interconnect metal aluminum alloy pipe with metal steel pipe or accessory items except as permitted through M 196.
3.Repairs to the high frequency resistance welded (HFRW) seam in steel continuous welded helical corrugated metal pipe (CMP) are to be adherent to the following guidelines:
a.For pipes with a nominal diameter of 24 inches or greater, the maximum allowable total length of manual weld repair for the helical weld seam in a section of steel CMP is ½-inch of weld per 1- inch of nominal pipe diameter per 20 feet (or fraction thereof) of pipe section length.
b.For pipes with a nominal diameter of less than 24 inches, the maximum allowable total length of the manual weld repair referenced in (a) is 12 inches.
c.For pipes with a nominal diameter of 24 inches or greater, the maximum allowable length of a single weld repair for the helical weld seam in a section of steel CMP is 1/4 -inch of weld per 1- inch of nominal pipe diameter, not to exceed 18 inches.
d.For pipes with a nominal diameter of less than 24 inches, the maximum allowable length of the single weld repair referenced in (c) is 6 inches.
e.Do not space repair welds closer than 1 helix length of welded seam. One helix length is the distance traversed by a point on the weld seam during 1 revolution of the pipe.
f.Repair welds are not permitted within the re-roll areas at the ends of a steel CMP section.
g.No visible discontinuities, e.g., hot or cold cracks, porosity, entrapped slag, voids, etc., are permitted within the total weld length, repair and coil splice welds included, of the finished section of steel CMP.
h.The preferred weld repair method is, but not restricted to, gas metal arc welding (GMAW). Any method that utilizes a ferrous based filler me tal compatible with th e parent coil steel and provides an acceptable repair weld is adequate. Weld repair without the us e of filler metal, such as by Gas Tungsten Arc Welding (GTAW), is also acceptable when practical.
i.Minimize the number of plant co il splices within a section of steel CMP. This is subject to the judgment of the KDOT inspector and based on the steel CMP section size. In no instance is the number of coil splices to exceed 3 per steel CMP section.
4.Produce end sections from the same metal and provid e with the same coating as the pipe to which they are to be attached. Comply with the design and dimension requirements as stated in subsection 1904.2a. However, the thermal treatment, denoted by the temper designatio n for aluminum alloys, must not reduce the ductility of the metal to the degree that forming tears or cracks occur during production of the end section. A section of CMP that is an integral component of the end section is subject to subsection 1904.2b. 1904 - CORRUGATED METAL PIPE AND END SECTIONS 1900-9
1904.3 Test Methods
Conduct all tests required by the applicable AASHTO, ASTM or other specification of subsection 1904.2b according to the procedures specified in that standard.
1904.4 Prequalification
Not applicable.
1904.5 Basis of Acceptance
a. Receipt and approval of a Type A certification as specified in DIVISION 2600 for all corrugated metal pipe (CMP) and the associated end sections and accessory items provided through this specification. b. Inspection, and testing when applicable, by field personnel of CMP and end sections and accessory items for compliance with corrosion protection coating thickness requirements when applicable, mechanical or welded seam quality, and dimensional requirements. c. The final disposition of CMP and end sections an d accessory items will be completed at the final destination as the result of inspectio n for the quality of workmanship, th e delivery condition, and receipt and approval of the associated required documentation. Corrugated metal pipe and end sections and accessory items may also require inspection during the production process at the fabrication facility.
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Source: Standard Specifications for State Road and Bridge Construction, 2015 Edition. Pages 862–863 of 978. View official source ↗