PSL1 Vs. PSL2 Differences
The American Petroleum Institute (API) designates different specifications on selling line pipe. The two specs under API 5L are PSL-1 and PSL-2. These specs cover seamless and welded steel line pipe from grades X42 through X80. API 5L is suitable for transporting gas, water, and oil, and is usually found in the hydrocarbon petroleum and natural gas industry.
The API committee issues standards in regards to these pipes, that most Energy companies require adherence to. PSL-1 and PSL-2 are standards that have been put in place to help with the more strict requirements for each grade. These two basic specifications are in part recognized as different levels of physical and technical requirements.
PSL-1 is a loose standard quality for line pipe, whereas PSL-2 contains additional testing requirement, stricter chemical physicals, along with different ceiling limits of mechanical properties, and require Charpy impact testing conditions.
Furthermore, additional testing requirements under PSL-2 include CVN testing, non-destructive inspection of seamless products, certification to SR15, and mandatory traceability throughout the entire production process. Most FERC, DOT, or FEMSA lines require PSL-2, meaning these types of requirements are a must when supplying pipe for pipelines that are regulated by any of these governing bodies.