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Cmp design guide Corrugated Metal PipeDesign Guide ENGINEERED SOLUTIONS PIPE SOLUTIONS Drainage Pipe Selection Introduction Environment Abrasion Guidelines Reference Specifications Usage Guide for Drainage Products Product Dimensions and Hydraulics HEL-CO

Corrugated Metal PipeDesign Guide ENGINEERED SOLUTIONS PIPE SOLUTIONS Drainage Pipe Selection Introduction Environment Abrasion Guidelines Reference Specifications Usage Guide for Drainage Products Product Dimensions and Hydraulics HEL-COR Corrugated Steel Pipe Height of Cover Tables Handling Weights CORLIX Corrugated Aluminum Pipe Height of Cover Tables Handling Weights ULTRA FLO Height of Cover Tables Handling Weights Installation of CMP Miscellaneous Smooth Cor QUICK STAB Joint End Sections Table of Contents ENGINEERED SOLUTIONS Durability Design Guide for Drainage Products Proper design of culverts and storm sewers requires structural hydraulic and durability considerations While most designers are comfortable with structural and hydraulic design the mechanics of evaluating abrasion corrosion and water chemistry to perform a durability design are not commonly found in most civil engineering handbooks The durability and service life of a drainage pipe installation is directly related to the environmental conditions encountered at the site and the type of materials and coatings from which the culvert is fabricated Two principle causes of reduced service life in drainage pipe materials are corrosion and abrasion Service life can be affected by the corrosive action of the backfill in contact with the outside of a drainage pipe or more commonly by the corrosive and abrasive action of the flow in the invert of the drainage pipe The design life analysis should include a check for both the water side and soil side environments to determine which is more critical ?? or which governs service life The potential for metal loss in the invert of a drainage pipe due to abrasive flows is often overlooked by designers and its effects are often mistaken for corrosion An estimate for potential abrasion is required at each pipe location in order to determine the appropriate material and gage This manual is intended to guide specifiers through the mechanics of selecting appropriate drainage products to meet service life requirements The information contained in the following pages is a composite of several national guidelines Using the Design Guide The choice of material gage and product type can be extremely important to service life The following steps describe the procedure for selecting the appropriate drainage product material and gage to meet a specific service life requirement Design Sequence Select pipe or structure based on hydraulic and clearance requirements Use Tables and as reference for size limits and hydraulic properties of all drainage products Use Height of Cover tables for the chosen pipe or structure to determine the material gage required for the specific loading condition Use Table to select the appropriate material for the site- specific environmental conditions Whenever possible existing installations of drainage structures along the same water course offer the most reliable estimate of long-term performance for specific environment conditions In many cases there will be more than one material that is appropriate for the project environmental conditions Generally speaking the metal material types increase in price as you move from top down on Table Please contact your local Contech Sales Representative for pricing Use Table to determine which abrasion