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May 4, 2025| | 0 Comment

API 607 vs API 608: Key Differences and Applications

# API 607 vs API 608: Key Differences and Applications

Introduction

When it comes to valve testing and performance standards, API 607 and API 608 are two important specifications that often cause confusion. While both are developed by the American Petroleum Institute (API), they serve different purposes and apply to different types of valves. Understanding the differences between these standards is crucial for engineers, procurement specialists, and safety professionals working in the oil and gas industry.

What is API 607?

API 607 is the standard for fire testing of quarter-turn valves and valves equipped with non-metallic seats. This specification evaluates how well a valve can maintain its sealing capability and structural integrity when exposed to fire conditions. The standard applies to:

  • Ball valves

  • Butterfly valves

  • Plug valves

  • Other quarter-turn valves

The fire test involves exposing the valve to temperatures up to 1,400°F (760°C) for 30 minutes while maintaining pressure. After the fire exposure, the valve must still be operable and maintain its sealing capability.

What is API 608?

API 608 covers the design, manufacturing, and testing of metal ball valves for use in the petroleum and natural gas industries. This standard specifies requirements for:

  • Full-port and reduced-port ball valves

  • Flanged, threaded, and welded end connections

  • Valves from NPS 1/2 to NPS 24

  • Pressure classes from 150 to 2500

Unlike API 607, API 608 is not specifically about fire testing but rather establishes comprehensive requirements for ball valve construction and performance under normal operating conditions.

Key Differences Between API 607 and API 608

Feature API 607 API 608
Scope Fire testing of quarter-turn valves Design and manufacturing of metal ball valves
Valve Types All quarter-turn valves with non-metallic seats Metal ball valves specifically
Primary Focus Performance under fire conditions General construction and performance
Testing Requirements Fire resistance testing Pressure testing, material verification, etc.
Certification Fire-safe certification Manufacturing quality certification

Applications in Industry

API 607 Applications

API 607 certified valves are critical in applications where fire safety is paramount:

  • Offshore platforms

  • Refineries

  • Chemical plants

  • Gas processing facilities

  • Any location with high fire risk

API 608 Applications

API 608 valves are widely used in general service applications throughout the oil and gas industry:

  • Pipeline systems

  • Production facilities

  • Storage terminals

  • Transmission systems

  • General process applications

Can a Valve Meet Both Standards?

Yes, it’s possible