# API 607 vs API 608: Key Differences and Applications
Introduction
When it comes to valve testing and fire safety standards in the oil and gas industry, API 607 and API 608 are two critical specifications that often come into discussion. While both standards relate to valves and fire safety, they serve different purposes and apply to distinct types of valves. Understanding the differences between API 607 and API 608 is essential for engineers, procurement specialists, and safety professionals working in hazardous environments.
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 the ability of a valve to maintain its integrity and operability after exposure to fire.
Key characteristics of API 607:
- Applies to quarter-turn valves (ball, butterfly, plug valves)
- Focuses on valves with non-metallic seats
- Tests valve performance during and after fire exposure
- Includes leakage rate requirements post-fire test
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 various industrial applications.
Key characteristics of API 608:
- Applies specifically to metal ball valves
- Covers flanged, threaded, and welding end connections
- Includes pressure-temperature ratings
- Specifies material requirements and testing procedures
Key Differences Between API 607 and API 608
| Feature | API 607 | API 608 |
|---|---|---|
| Scope | Fire testing standard | Design and manufacturing standard |
| Valve Types | Quarter-turn valves with non-metallic seats | Metal ball valves |
| Primary Focus | Fire safety performance | General valve construction and quality |
| Testing Requirements | Fire exposure and post-fire leakage | Pressure testing, material verification |
Applications of API 607 and API 608 Valves
API 607 Applications
API 607 compliant valves are typically used in:
- Oil refineries
- Chemical processing plants
- Offshore platforms
- Other facilities where fire risk is significant
API 608 Applications
API 608 valves find applications in:
- General industrial piping systems
- Oil and gas production facilities
- Power generation plants
- Water treatment systems
Choosing Between API 607 and API 608
The choice between API 607 and API 608 depends on your specific requirements:
- If you need valves that must maintain integrity during fire exposure, API 607 is the relevant standard.
- If you’re specifying metal ball valves for general service, API 608 provides the design and manufacturing requirements.
- Some valves may