Over the past half century, corrugated steel pipe (CSP) coatings such as polymer-coated and aluminized Type 2 (ALT2) have increased in popularity due to their exceptional service-life capabilities. Independent field evaluations have proven that when specified within the industry-recommended environmental conditions, polymer-coated and ALT2 CSP can provide a service life in excess of 100 years. Check out the NCSPA design manual online for information on how CSP solutions can meet your needs.