# Comparison of ASME B16.34 and API 600 Standards

## Introduction

When it comes to industrial valves, two of the most 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 the differences between these standards is crucial for engineers, procurement specialists, and quality control professionals working in the oil and gas, power generation, and chemical processing industries.

## Overview of ASME B16.34

The ASME B16.34 standard, developed by the American Society of Mechanical Engineers, is a comprehensive document that covers:

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

This standard applies to a wide range of valve types including gate, globe, check, ball, and butterfly valves in flanged, threaded, and welding end connections.

## 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 of API 600 include:

– Design requirements
– Material specifications
– Testing procedures
– Inspection criteria
– Documentation requirements

## 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 specifically tailored for gate valves in petroleum applications.

### Pressure-Temperature Ratings

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

### Material Requirements

ASME B16.34 Materials

The standard references ASME material specifications and allows for a wider range of materials suitable for general industrial applications.

API 600 Materials

This standard specifies materials with proven performance in hydrocarbon service, including requirements for sour service applications.

### Testing Requirements

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

## When to Use Each Standard

Choosing between ASME B16.34 and API 600 depends on several factors:

• For general industrial applications, ASME B16.34 is typically sufficient
• For critical petroleum and natural gas services, API 600 valves are often specified
• When severe service conditions are present, API 600 provides additional safeguards
• For power generation applications, ASME B16.34 is commonly referenced

## Conclusion

Both ASME B16.34 and API 600 play important roles in valve specification and manufacturing. While ASME B16.34 provides a broad foundation for valve design across industries, API 600 offers specialized requirements for the demanding conditions of petroleum applications. Understanding these differences ensures proper valve selection for specific service conditions and helps maintain system reliability and safety.