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. Both standards play a crucial role in ensuring the quality, safety, and performance of valves used in various industries. While they share some similarities, they also have distinct differences that engineers and manufacturers must consider.

Overview of ASME B16.34

The ASME B16.34 standard, developed by the American Society of Mechanical Engineers, covers the design, materials, dimensions, testing, and inspection requirements for valves. This standard applies to a wide range of valve types, including gate, globe, check, ball, and butterfly valves, with pressure ratings from Class 150 to Class 4500.

Overview of API 600

API 600, created by the American Petroleum Institute, specifically focuses on bolted bonnet steel gate valves for petroleum and natural gas industries. This standard provides more detailed requirements for materials, design, and testing of gate valves, particularly those used in high-pressure and high-temperature applications.

Key Differences Between the Standards

Scope and Application

ASME B16.34 has a broader scope, covering multiple valve types across various industries, while API 600 is specialized for steel gate valves in the oil and gas sector.

Material Requirements

API 600 includes more stringent material specifications, particularly for components exposed to harsh environments. It provides detailed requirements for corrosion-resistant materials and additional testing for sour service applications.

Testing Requirements

Both standards require pressure testing, but API 600 includes more comprehensive testing protocols, including extended shell tests and additional requirements for high-pressure applications.

Design Features

API 600 specifies certain design features unique to gate valves, such as backseat design, stem design, and bonnet bolting requirements, which are not covered in ASME B16.34.

When to Use Each Standard

ASME B16.34 is typically used as a baseline standard for general valve applications, while API 600 is specified for critical service gate valves in the petroleum industry. Many projects require compliance with both standards to ensure comprehensive quality and performance.

Conclusion

Understanding the differences between ASME B16.34 and API 600 is essential for proper valve selection and specification. While ASME B16.34 provides general requirements for various valve types, API 600 offers specialized criteria for steel gate valves in demanding oil and gas applications. Engineers should carefully consider the specific requirements of their projects when choosing between these standards.