# 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, including oil and gas, petrochemical, and power generation. While both standards address valve design and manufacturing, they have distinct focuses and applications.

Scope and Application

ASME B16.34 is a comprehensive standard that covers the design, materials, dimensions, and testing requirements for valves with flanged, threaded, and welded ends. It applies to a wide range of valve types, including gate, globe, check, ball, and butterfly valves, for various pressure classes.

API 600, on the other hand, is specifically focused on bolted bonnet steel gate valves for petroleum and natural gas industries. It provides more detailed requirements for gate valve design, materials, and testing, making it a more specialized standard compared to ASME B16.34.

Key Differences

1. Valve Types Covered

ASME B16.34 covers multiple valve types, while API 600 is exclusively for bolted bonnet steel gate valves.

2. Pressure-Temperature Ratings

ASME B16.34 provides detailed pressure-temperature ratings for various materials, whereas API 600 references ASME B16.34 for these ratings but adds additional requirements specific to gate valves.

3. Material Requirements

API 600 has more stringent material requirements, particularly for critical components like stems and seats, to ensure durability in harsh oil and gas environments.

4. Testing Requirements

While both standards require pressure testing, API 600 includes additional testing requirements such as backseat testing and shell test duration that are specific to gate valve applications.

When to Use Each Standard

Choose ASME B16.34 when you need a general standard applicable to various valve types across different industries. Opt for API 600 when specifically dealing with bolted bonnet steel gate valves in petroleum or natural gas applications where higher reliability and durability are required.

Conclusion

Both ASME B16.34 and API 600 are important standards in the valve industry, serving different but complementary purposes. Understanding their differences helps engineers and procurement specialists select the appropriate standard for their specific application, ensuring optimal valve performance and safety.