API 607 vs API 608: Key Differences and Applications

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on May 30, 2025

# API 607 vs API 608: Key Differences and Applications

Introduction

When it comes to valve testing standards, API 607 and API 608 are two critical specifications that often come up in discussions. While both are developed by the American Petroleum Institute (API), they serve different purposes and apply to distinct types of valves. Understanding the differences between these standards is essential for engineers, procurement specialists, and safety professionals working in industries that rely on valves for critical applications.

What is API 607?

API 607 is a testing standard that evaluates the fire resistance of quarter-turn valves and actuators. The full title of the standard is “Fire Test for Quarter-turn Valves and Valves Equipped with Nonmetallic Seats.” This standard specifies the procedures for testing valves to ensure they can maintain their integrity and provide a reasonable degree of leakage control when exposed to fire conditions.

Key characteristics of API 607:

  • Applies to quarter-turn valves (ball, butterfly, plug valves)

  • Focuses on fire resistance testing

  • Evaluates valve performance during and after fire exposure

  • Includes testing of nonmetallic seat materials

What is API 608?

API 608 is a manufacturing standard titled “Metal Ball Valves – Flanged, Threaded, and Welding End.” Unlike API 607 which is a testing standard, API 608 defines the design, materials, dimensions, and pressure-temperature ratings for metal ball valves used in petroleum and natural gas industries.

Key characteristics of API 608:

  • Applies specifically to metal ball valves

  • Covers design and manufacturing requirements

  • Specifies pressure-temperature ratings

  • Includes requirements for end connections (flanged, threaded, welded)

Key Differences Between API 607 and API 608

Feature API 607 API 608
Purpose Fire testing standard Manufacturing standard
Valve Types Quarter-turn valves (ball, butterfly, plug) Metal ball valves only
Focus Fire resistance performance Design, materials, dimensions
Testing Requirements Fire exposure tests Pressure tests, material tests
Certification Fire test certification Manufacturing compliance

Applications of API 607 and API 608

API 607 Applications

API 607 certified valves are typically used in applications where fire safety is a critical concern:

  • Oil and gas processing facilities

  • Chemical plants

  • Refineries

  • Offshore platforms

  • Any location with potential fire hazards

API 608 Applications

API 608 compliant ball valves are widely used in various industrial applications:

  • Pipeline systems

  • Petroleum refining

  • Natural gas processing

  • Chemical processing

  • Power generation

Can a Valve Meet Both Standards?

Yes, it’s possible for a

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