API 607 vs API 608: Key Differences in Valve Fire Testing Standards

# API 607 vs API 608: Key Differences in Valve Fire Testing Standards

Introduction

When it comes to fire safety in industrial valve applications, two key standards often come into play: API 607 and API 608. While both address fire testing for valves, they serve different purposes and apply to different valve types. Understanding the differences between these standards is crucial for engineers, procurement specialists, and safety professionals working in industries where fire safety is paramount.

What is API 607?

API 607 is the standard for Fire Test for Quarter-turn Valves and Valves Equipped with Non-metallic Seats. This standard specifies fire testing requirements for:

  • Quarter-turn valves (ball, butterfly, plug valves)

  • Valves with non-metallic seating materials

  • Valves intended for general industrial applications

The test evaluates a valve’s ability to maintain structural integrity and minimal leakage after exposure to intense fire conditions.

What is API 608?

API 608 is the standard for Metal Ball Valves – Flanged, Threaded, and Welding End. While it includes fire testing requirements, its scope is more specific:

  • Applies specifically to metal ball valves

  • Covers flanged, threaded, and welding end connections

  • Includes dimensional and design requirements beyond just fire testing

Key Differences Between API 607 and API 608

1. Scope of Application

API 607 applies to a broader range of quarter-turn valves and valves with non-metallic seats, while API 608 is specific to metal ball valves with certain end connections.

2. Fire Test Duration

Both standards require a 30-minute fire test, but API 608 includes additional requirements for prolonged fire exposure in some cases.

3. Leakage Criteria

API 607 allows for slightly higher leakage rates during testing compared to API 608, reflecting their different applications and risk profiles.

4. Valve Types Covered

API 607 covers:

  • Ball valves

  • Butterfly valves

  • Plug valves

  • Other quarter-turn designs

API 608 is exclusively for ball valves.

5. Additional Requirements

API 608 includes comprehensive requirements for:

  • Valve design

  • Materials

  • Dimensions

  • Pressure-temperature ratings

API 607 focuses primarily on fire testing methodology.

Choosing the Right Standard

Selecting between API 607 and API 608 depends on:

  1. Valve type: Quarter-turn valves vs. specifically ball valves

  2. Application: General industrial vs. specific piping systems

  3. Safety requirements: Basic fire protection vs. comprehensive performance

  4. Industry specifications: Some industries mandate one standard over the other

Conclusion

While API 607 and API 608 both address fire safety for valves, they serve different purposes in the industrial landscape. API