An American National Standard. American Petroleum Institute (API). Third Edition, July 2008. Effective Date: January 1, 2009. 85p. This Standard 13628 defines the technical requirements for safe, dimensionally and functionally interchangeable flexible pipes that are designed and manufactured to uniform standards and criteria. Minimum requirements are specified for the design, material selection, manufacture, testing, marking and packaging of flexible pipes, with reference to existing codes and standards where applicable.