Comparison of ASME B16.34 and API 600 Standards

# 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 provide guidelines for the design, materials, testing, and inspection of valves used in various industries. While both standards serve similar purposes, they have distinct differences that engineers and procurement specialists should understand.

Scope and Application

ASME B16.34 is a comprehensive standard that covers pressure-temperature ratings, dimensions, and materials for valves of various types, including gate, globe, check, ball, and butterfly valves. It applies to valves made of forged or cast materials and is widely used across multiple industries.

API 600, on the other hand, specifically focuses 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 the preferred standard for oil and gas applications.

Key Differences

1. Valve Types Covered

ASME B16.34 covers a broader range of valve types, while API 600 is exclusively for steel gate valves with bolted bonnets.

2. Material Requirements

API 600 has more stringent material requirements, particularly for critical components like stems and seats. It specifies minimum material grades and additional testing requirements for these parts.

3. Testing Requirements

Both standards require pressure testing, but API 600 includes additional tests such as backseat testing and shell test duration requirements that are more rigorous than those in ASME B16.34.

4. Temperature and Pressure Ratings

While both standards provide pressure-temperature ratings, API 600 includes specific requirements for high-pressure and high-temperature applications common in oil and gas operations.

When to Use Each Standard

Choose ASME B16.34 when working with general industrial applications involving various valve types. Opt for API 600 when specifying bolted bonnet steel gate valves for petroleum or natural gas service, especially in critical applications where reliability is paramount.

Conclusion

Understanding the differences between ASME B16.34 and API 600 is crucial for proper valve selection and specification. While ASME B16.34 provides broader coverage, API 600 offers more specialized requirements for gate valves in the oil and gas industry. Engineers should carefully consider their application requirements when choosing between these two important standards.