Comparison of ASME B16.34 and API 600 Standards for Valve Design

# Comparison of ASME B16.34 and API 600 Standards for Valve Design

Introduction

When it comes to valve design and manufacturing, two commonly referenced standards are ASME B16.34 and API 600. While both standards provide guidelines for valve construction, they serve different purposes and have distinct requirements. This article explores the key differences between these two important standards in the valve industry.

Overview of ASME B16.34

ASME B16.34 is a comprehensive standard published by the American Society of Mechanical Engineers that covers pressure-temperature ratings, dimensions, and materials for valves, flanges, and fittings. This standard applies to a wide range of valve types including gate, globe, check, ball, and butterfly valves.

Key Features of ASME B16.34:

• Establishes pressure-temperature ratings for valves
• Defines wall thickness requirements
• Specifies material requirements
• Covers both flanged and welded-end valves
• Applies to valves of various sizes and pressure classes

Overview of API 600

API 600 is a standard developed by the American Petroleum Institute specifically for bolted bonnet steel gate valves for petroleum and natural gas industries. It’s more specialized than ASME B16.34 and focuses on a single valve type with specific design requirements.

Key Features of API 600:

• Specifically for bolted bonnet steel gate valves
• Includes requirements for fire-safe design
• Contains provisions for extended body designs
• Specifies testing requirements
• Focuses on applications in petroleum and natural gas industries

Main Differences Between ASME B16.34 and API 600

Scope and Application

ASME B16.34 has a broader scope, covering multiple valve types across various industries, while API 600 is specifically designed for steel gate valves in the oil and gas sector.

Design Requirements

API 600 includes more detailed design specifications for gate valves, such as minimum stem diameter requirements and specific bonnet bolting patterns, which aren’t covered in ASME B16.34.

Testing Requirements

API 600 mandates more rigorous testing procedures, including fire testing for fire-safe valves, while ASME B16.34 focuses more on dimensional and material specifications.

Pressure-Temperature Ratings

While both standards reference pressure-temperature ratings, API 600 may have additional requirements specific to the operating conditions in petroleum applications.

Which Standard to Use?

The choice between ASME B16.34 and API 600 depends on the specific application. For general valve design across various industries, ASME B16.34 is typically referenced. For steel gate valves in oil and gas applications, API 600 is usually specified in addition to ASME B16.34 requirements.

Conclusion

Both ASME B16.34 and API 600 play crucial roles in valve design and manufacturing. While ASME B16.34 provides fundamental requirements applicable to various valve types, API 600 offers specialized specifications for gate valves in demanding petroleum applications. Understanding the differences between these standards helps engineers select the appropriate specifications for their specific valve requirements.