API 5L GB /ASTM A106B/ASME A53 GB

API 5LGB, ASTM A106B, ASME A53, are standards or specifications related to different aspects of steel pipes:

• API 5L: It is a standard developed by the American Petroleum Institute (API) for the transportation of natural gas, oil, and water through pipelines. It specifies requirements for seamless and welded steel pipes, including various grades such as API 5L Grade B, X42, X52, etc.
• ASTM A106B: ASTM A106 is a specification from the American Society for Testing and Materials (ASTM) that covers seamless carbon steel pipe for high-temperature service. A106B is a specific grade within this specification, indicating certain mechanical properties and chemical composition requirements.
• ASME A53: ASME A53 is a specification from the American Society of Mechanical Engineers (ASME) that covers seamless and welded black and hot-dipped galvanized steel pipe. Similar to ASTM A106, A53 also specifies certain mechanical and chemical properties for the pipes.

In summary, these standards/specifications define requirements for different types of steel pipes used in various applications, such as oil and gas pipelines, high-temperature services, and general fluid transportation.