# 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. Both standards play crucial roles in ensuring the safety, reliability, and performance of valves used in various industries. While they share some similarities, they also have distinct differences that engineers and manufacturers must understand.

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 welding end connections. It applies to a wide range of valve types, including gate, globe, check, ball, and butterfly valves.

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 valves used in high-pressure and high-temperature applications.

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

Both standards provide pressure-temperature ratings, but API 600 includes additional requirements for severe service conditions common in oil and gas applications.

3. Material Requirements

API 600 has more stringent material specifications, particularly for valve bodies, bonnets, and trim components.

4. Testing Requirements

While both standards require pressure testing, API 600 includes additional tests like shell and backseat tests that are specific to gate valves.

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 for petroleum and natural gas service where more rigorous requirements are needed.

Conclusion

Understanding the differences between ASME B16.34 and API 600 is essential for proper valve selection and application. While ASME B16.34 provides broader coverage, API 600 offers specialized requirements for critical gate valve applications in the oil and gas industry. Many valves are designed to meet both standards when required by project specifications.