Comparison of ASME B16.34 and API 600 Standards

# Comparison of ASME B16.34 and API 600 Standards

Introduction

When it comes to industrial valve standards, two commonly referenced documents are ASME B16.34 and API 600. While both standards address valve design and manufacturing, they serve different purposes and have distinct requirements. Understanding the differences between these standards is crucial for engineers, procurement specialists, and quality control professionals working in the oil and gas, power generation, and process industries.

Scope and Application

ASME B16.34 is a comprehensive standard that covers the design, materials, dimensions, testing, and inspection requirements for flanged, threaded, and welded-end valves. 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, 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 specific to gate valve design and performance.

Key Differences

1. Valve Types Covered

ASME B16.34 applies to multiple valve types, while API 600 is exclusively for steel gate valves with bolted bonnets.

2. Pressure-Temperature Ratings

Both standards provide pressure-temperature ratings, but API 600 includes additional requirements for extreme 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 corrosion resistance.

4. Testing Requirements

While both standards require pressure testing, API 600 includes additional testing protocols such as extended shell tests and more rigorous seat leakage tests.

When to Use Each Standard

ASME B16.34 is typically specified for general industrial applications across various industries. It’s often referenced in power plants, chemical processing, and other industrial facilities where multiple valve types are used.

API 600 is primarily used in the oil and gas industry, particularly for critical applications where gate valves are subjected to high pressures, corrosive environments, or extreme temperatures.

Conclusion

While there is some overlap between ASME B16.34 and API 600, they serve different purposes in the valve industry. ASME B16.34 provides broad requirements applicable to various valve types, while API 600 offers specialized criteria for steel gate valves in demanding oil and gas service. Understanding these differences helps ensure proper valve selection and compliance with project specifications.