# Comparison of ASME B16.34 and API 600 Standards
Introduction
When it comes to industrial valves, two commonly referenced standards are ASME B16.34 and API 600. These standards play a crucial role in ensuring the safety, reliability, and performance of valves used in various industries. While both standards address valve design and manufacturing, they have distinct focuses and applications.
Overview of ASME B16.34
ASME B16.34 is a standard developed by the American Society of Mechanical Engineers (ASME) that covers pressure-temperature ratings, dimensions, tolerances, materials, and testing requirements for valves. This standard applies to:
- Flanged, threaded, and welding end valves
- Valves made of steel, nickel-base alloys, and other materials
- Gate, globe, check, ball, and butterfly valves
Overview of API 600
API 600 is a standard from the American Petroleum Institute (API) that specifically focuses on bolted bonnet steel gate valves for petroleum and natural gas industries. Key aspects of API 600 include:
- Design requirements for refinery and pipeline service
- Material specifications and testing procedures
- Fire-safe design considerations
- Extended body designs for severe service conditions
Key Differences Between the Standards
| Feature | ASME B16.34 | API 600 |
|---|---|---|
| Scope | Broad coverage of multiple valve types | Focuses specifically on steel gate valves |
| Industry Focus | General industrial applications | Petroleum and natural gas industries |
| Pressure-Temperature Ratings | Provides comprehensive ratings | References ASME B16.34 for ratings |
| Testing Requirements | Basic pressure testing | More rigorous testing including fire testing |
When to Use Each Standard
The choice between ASME B16.34 and API 600 depends on the application:
- ASME B16.34 is suitable for general industrial applications where various valve types are needed
- API 600 is preferred for oil and gas applications, particularly where fire safety and severe service conditions are concerns
Conclusion
Both ASME B16.34 and API 600 are essential standards in the valve industry, serving different but complementary purposes. Understanding their differences helps engineers and specifiers select the appropriate standard for their specific application requirements. While ASME B16.34 provides a broader framework for valve design, API 600 offers specialized requirements for critical petroleum industry applications.