# Comparison of ASME B16.34 and API 600 Standards

Introduction

In the world of industrial valves, two commonly referenced standards are ASME B16.34 and API 600. While both standards address valve design and manufacturing, they serve different purposes and have distinct requirements. This article explores the key differences between these two important standards.

Scope and Application

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

API 600, on the other hand, specifically focuses on bolted bonnet steel gate valves for petroleum and natural gas industries. It’s more specialized than ASME B16.34 and includes additional requirements for materials, design, and testing specific to gate valves.

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 components exposed to harsh environments. It includes specific requirements for trim materials and hardness.

4. Testing Requirements

While both standards require pressure testing, API 600 includes additional tests like shell and backseat tests that are more rigorous than ASME B16.34 requirements.

When to Use Each Standard

Use ASME B16.34 when you need a general standard applicable to various valve types across different industries. It’s particularly useful for power generation, chemical processing, and general industrial applications.

Choose API 600 when specifying bolted bonnet steel gate valves for petroleum refineries, pipeline systems, or other oil and gas applications where more stringent requirements are necessary.

Conclusion

While there is some overlap between ASME B16.34 and API 600, they serve different purposes in the valve industry. Understanding these differences helps engineers and procurement specialists select the appropriate standard for their specific application. Many high-performance valves are designed to meet both standards, providing the broadest possible application coverage.

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