# 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, particularly in oil and gas, petrochemical, and power generation applications.

## Understanding ASME B16.34

The ASME B16.34 standard is titled “Valves – Flanged, Threaded, and Welding End” and is published by the American Society of Mechanical Engineers. This comprehensive standard covers:

Pressure-temperature ratings

Materials

Dimensions

Tolerances

Testing requirements

Key Features of ASME B16.34

The standard applies to various valve types including gate, globe, check, ball, and butterfly valves. It establishes pressure-temperature ratings for different material groups and provides detailed requirements for valve design, construction, and testing.

## Understanding API 600

API 600, titled “Steel Gate Valves – Flanged and Butt-Welding Ends, Bolted Bonnets,” is published by the American Petroleum Institute. This standard specifically focuses on:

Bolted bonnet steel gate valves

Design requirements

Material specifications

Testing procedures

Inspection criteria

Key Features of API 600

API 600 is more specialized than ASME B16.34, concentrating exclusively on steel gate valves for petroleum and natural gas industries. It includes additional requirements beyond ASME B16.34 for applications in these demanding environments.

## Main Differences Between ASME B16.34 and API 600

Scope and Application

ASME B16.34 has a broader scope, covering multiple valve types, while API 600 focuses specifically on bolted bonnet steel gate valves.

Pressure-Temperature Ratings

Both standards reference similar pressure-temperature ratings, but API 600 includes additional requirements for severe service conditions.

Material Requirements

API 600 provides more detailed material specifications tailored for petroleum applications, including requirements for trim materials.

Testing Requirements

API 600 generally has more stringent testing requirements, particularly for high-pressure applications.

## When to Use Each Standard

The choice between these standards depends on the application:

• Use ASME B16.34 for general industrial valve applications
• Use API 600 specifically for steel gate valves in petroleum and natural gas services
• Many projects require compliance with both standards

## Conclusion

While ASME B16.34 and API 600 share some common ground, they serve different purposes in the valve industry. ASME B16.34 provides fundamental requirements for a wide range of valves, while API 600 offers specialized requirements for steel gate valves in demanding petroleum applications. Understanding the differences between these two commonly used standards is essential for proper valve selection and application.