# 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. While both standards address valve design and manufacturing, they serve different purposes and have distinct requirements. Understanding these differences is crucial for engineers, procurement specialists, and quality control professionals working with industrial valves.

Scope and Application

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

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 in hydrocarbon service.

Key Differences

1. Valve Types Covered

ASME B16.34 covers 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 severe service conditions common in oil and gas applications.

3. Material Requirements

API 600 has more stringent material specifications, particularly for components exposed to corrosive environments. It mandates specific material grades and additional testing for critical applications.

4. Testing Requirements

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

When to Use Each Standard

Choose ASME B16.34 when you need a general valve standard applicable to various valve types across different industries. Opt for API 600 when specifically dealing with steel gate valves in petroleum or natural gas service where more rigorous requirements are needed.

Conclusion

Both ASME B16.34 and API 600 play important roles in valve standardization. While ASME B16.34 provides broad coverage for multiple valve types, API 600 offers specialized requirements for gate valves in demanding hydrocarbon services. Understanding their differences ensures proper valve selection and compliance with industry requirements.