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. These 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 procurement specialists should understand.

## Overview of ASME B16.34

The ASME B16.34 standard, developed by the American Society of Mechanical Engineers, is one of the most widely recognized standards for valves. It covers:

• Pressure-temperature ratings
• Materials
• Dimensions
• Testing requirements
• Marking requirements

This standard applies to flanged, threaded, and welded-end valves made of cast, forged, or fabricated materials. It’s particularly important for valves used in power plants and process industries.

## Overview of API 600

API 600, developed by the American Petroleum Institute, is specifically focused on bolted bonnet steel gate valves for petroleum and natural gas industries. Key aspects include:

• Design requirements
• Material specifications
• Testing procedures
• Inspection criteria

This standard is more specialized than ASME B16.34 and is primarily used in oil and gas applications where high pressure and corrosive environments are common.

## Key Differences Between the Standards

1. Scope and Application

ASME B16.34 has a broader scope, covering various valve types and materials, while API 600 is specifically for bolted bonnet steel gate valves used in hydrocarbon services.

2. Pressure-Temperature Ratings

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

3. Material Requirements

API 600 has more stringent material specifications, particularly for components exposed to corrosive environments. It also includes specific requirements for trim materials.

4. Testing Requirements

While both standards require pressure testing, API 600 includes more comprehensive testing protocols, including extended shell tests and optional fire testing.

## When to Use Each Standard

The choice between ASME B16.34 and API 600 depends on the application:

• ASME B16.34 is suitable for general industrial applications across various industries
• API 600 is preferred for critical service in oil, gas, and petrochemical industries where reliability under harsh conditions is paramount

## Conclusion

Understanding the differences between ASME B16.34 and API 600 is essential for proper valve selection. While ASME B16.34 provides a comprehensive foundation for valve standards, API 600 offers specialized requirements for demanding hydrocarbon services. Engineers should carefully consider their specific application requirements when choosing between these standards or determining if compliance with both is necessary.