API 607 vs API 608: Key Differences and Applications

Posted on by

# API 607 vs API 608: Key Differences and Applications

Introduction

When it comes to industrial valves, safety and performance standards are critical. Two important standards in this field are API 607 and API 608. While both relate to valve testing and performance, they serve different purposes and apply to different types of valves. Understanding the differences between these standards is essential for engineers, procurement specialists, and safety professionals working with industrial valve systems.

What is API 607?

API 607 is a standard that specifies fire testing requirements for quarter-turn valves and actuators. The full title is “Fire Test for Quarter-turn Valves and Valves Equipped with Nonmetallic Seats.” This standard evaluates a valve’s ability to maintain sealing integrity during and after exposure to fire conditions.

Key characteristics of API 607:

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

  • Focuses on fire safety performance

  • Tests valves with nonmetallic seats

  • Includes both soft-seated and metal-seated valve testing

What is API 608?

API 608 is titled “Metal Ball Valves – Flanged, Threaded, and Welding End.” This standard covers the design, materials, dimensions, testing, and inspection requirements for metal ball valves used in industrial applications.

Key characteristics of API 608:

  • Specific to metal ball valves

  • Covers design and manufacturing requirements

  • Includes pressure testing specifications

  • Addresses flanged, threaded, and welded end connections

Key Differences Between API 607 and API 608

Feature API 607 API 608
Scope Fire testing for quarter-turn valves Design and manufacturing of metal ball valves
Valve Types Ball, butterfly, plug valves Metal ball valves only
Focus Fire safety performance General design and quality
Testing Fire endurance testing Pressure and leakage testing
Seat Materials Primarily nonmetallic Metal-to-metal

Applications of API 607 and API 608 Valves

API 607 Valve Applications

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

  • Oil and gas processing facilities

  • Chemical plants

  • Refineries

  • Power generation plants

  • Any environment with fire hazards

API 608 Valve Applications

API 608 valves are commonly found in:

  • Pipeline systems

  • Process piping

  • High-pressure applications

  • Systems requiring reliable shut-off

  • General industrial applications

Choosing Between API 607 and API 608

The choice between these standards depends on your specific requirements:

Choose API 607 when:

  • Fire safety is a primary concern</