Abstract: Described mainly in the paper are the origin and procedure for marking of pipe to multiple grades as newly required under API Spec 5L Specification for Line Pipes, the 45th edition. Only agreed by both the purchaser and the manufacturer, should marking of pipe to multiple grades be permitted. The steel grade range for multiple markings shall be as per API Standard 1104 Welding of Pipelines and Related Facilities. The steel pipe shall be marked to one PSL level only. The manufacturer is responsible to ensure that the pipe conforms to all requirements of each of the certified grades. This allows pipe to be used as any of grades individually. Once the steel pipe is delivered, it shall not be permitted to get the pipe re-marked or re-inspected to identify it with different steel grade or PSL level.