WHAT IS DIFFERENCE BETWEEN API 6D AND API 600

API 6D and API 600 are both standards related to valves in the oil and gas industry, but they refer to different types of valves and have distinct specifications and applications. Here’s an overview of the differences between the two: ### API 6D: 1. **Standard Type**: API 6D is a standard developed by the American Petroleum Institute (API) that outlines the specifications for pipeline valves used in the oil and gas industry. 2. **Valves Covered**: It applies to various types of valves, including gate valves, ball valves, plug valves, and check valves that are used in pipelines. 3. **Application**: API 6D valves are designed specifically for use in pipeline systems, ensuring they can withstand the pressures and conditions found in transportation applications. 4. **Design Requirements**: This standard includes detailed requirements for design, materials, testing, and quality assurance to ensure reliability and performance in pipeline operations. 5. **Testing**: API 6D specifies testing requirements for valve functionality, including hydrostatic tests, seat leakage tests, and operational tests. ### API 600: 1. **Standard Type**: API 600 is a standard that specifies the design and performance criteria for cast steel gate valves used in the petroleum and natural gas industries. 2. **Valves Covered**: It primarily focuses on gate valves, specifically those made from cast steel, and as a result, its application is more specific than API 6D. 3. **Application**: API 600 valves are typically used in refinery and petrochemical applications, where their design is critical for stop-and-start operations. 4. **Design Requirements**: The standard outlines requirements for the valve's construction, dimensions, materials, and pressure-temperature ratings specific to gate valves. 5. **Testing**: Similar to API 6D, API 600 also has its own set of testing and inspection requirements, although they are specific to gate valves. ### Summary: - **Scope**: API 6D covers a broader range of valves (gate, ball, plug, check) used in pipeline systems, while API 600 specifically governs gate valves. - **Application**: API 6D is meant for pipeline applications, and API 600 is targeted more toward applications in refineries and petrochemical facilities. In summary, the choice between API 6D and API 600 will depend on the specific needs of the application and the type of valve required.