# Comparison of ASME B16.34 and API 600 Standards for Valve Design

When it comes to valve design and manufacturing, industry standards play a crucial role in ensuring safety, reliability, and performance. Two of the most commonly referenced standards in the valve industry are ASME B16.34 and API 600. While both standards address valve design, they have distinct focuses and applications. This article explores the key differences and similarities between these two important standards.

## 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 valve design. It covers:

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

This standard applies to flanged, threaded, and welding end valves made of materials such as carbon steel, alloy steel, and stainless steel.

## 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. The standard includes:

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

API 600 valves are typically used in more demanding applications where reliability is critical.

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

While both standards address valve design, there are several important distinctions:

### 1. Scope and Application

ASME B16.34 has a broader scope, covering various types of valves (gate, globe, check, etc.) for general industrial applications. API 600 is specifically for bolted bonnet steel gate valves used in the petroleum industry.

### 2. Design Requirements

API 600 includes more stringent design requirements, particularly for:

– Stem design
– Backseat provisions
– Bonnet bolting
– Pressure testing

### 3. Material Specifications

ASME B16.34 references ASME material specifications, while API 600 includes additional requirements for material toughness and corrosion resistance suitable for oil and gas applications.

### 4. Testing Requirements

API 600 generally requires more rigorous testing, including:

– Extended shell test duration
– Additional backseat testing
– More stringent leakage requirements

## Similarities Between the Standards

Despite their differences, ASME B16.34 and API 600 share some common ground:

– Both reference ASME material specifications
– Both include pressure-temperature ratings
– Both require non-destructive examination of critical areas
– Both specify marking requirements for valves

## Choosing Between ASME B16.34 and API 600

The choice between these standards depends on several factors:

– Industry requirements (general industrial vs. petroleum)
– Application severity
– Customer specifications
– Regulatory requirements

In many cases, API 600 valves will meet ASME B16.34 requirements, but the reverse is not always true due to API 600’s more stringent specifications.

## Conclusion

Understanding the differences between ASME B16.34 and API 600 is essential for proper valve selection and application. While ASME B16.34 provides a comprehensive foundation for valve design across various industries, API 600 offers specialized requirements for the demanding conditions of the petroleum industry. Engineers and procurement specialists should carefully consider their specific needs when specifying valves to ensure optimal performance and safety.