With its low cost, wide variety of diameters, layout configurations, and materials, no other material can match corrugated metal pipe's versatility and flexibility in design. Corrugated metal pipe is the “go to” material for the majority of pipe, culvert, and drainage system applications.
CMP is made in round pipe diameters from 6” through 144” (and even larger under certain conditions), and in arched (Pipe Arch) and elongated (typically 5%) shapes where cover heights or clearance requirements are critical. Structural Plate, which is field-bolted corrugated plates, is also available to even further expand the size and shape options! (Conventional structural plate supports spans to 26’ and deep corrugated plates can handle clear spans to approximately 70’.)
CMP is available in either steel or aluminum, and there are a number of coating options that may be applied to steel. Service life estimates of 100 years or more are common for applications, depending on the site conditions.
In drainage applications, CMP may be supplied with a Manning’s “n” coefficient as low as 0.012 if needed in order to increase the flow capacity of a pipe size that is restricted by the available headroom.
CMP is capable of handling vehicular and soil loadings which vary depending on the project requirements, and an option can typically be designed to suit your needs.
While often used at subdrainage, culvert, and storm sewer sites, CMP can be found in a broad variety of other applications as well. These include underground detention systems, pond risers, dams and levees, caissons, pedestrian tunnels, relines of existing structures, grade separations, aggregate conveyor housings, and aerial conduits.
While CMP is factory-made in lengths that are typically 20’ to 24’ long, a site may require horizontal and/or vertical turns and bends, and there may be a need for other pipes to inlet or outlet into a pipe run. The ends of a run may need a skew or a bevel (or even a combination skew and bevel!) to match the site grading. Shop cutting and welding is available to eliminate the need for this work to be done in the field, and for faster installation time.
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