api 608 vs api 598
API 598 is the valve inspection and testing standard developed by the American Petroleum Institute (API). This standard specifies pressure testing methods and acceptance criteria for various industrial valves and serves as a crucial basis for valve quality control in the petroleum, chemical, and other industries. The standard primarily applies to common valve types such as gate valves, globe valves, plug valves, ball valves, check valves, and butterfly valves, but it also allows for application to other special valves after consultation between the user and the manufacturer.
API 608 specifies the design, materials, and inspection requirements for flanged and threaded pneumatic gate valves used in the petrochemical industry. It clearly defines the sealing class (e.g., Class V leakage rate, bubble-level testing for no visible leakage), pressure and temperature ratings (must match operating conditions PN1.6-PN42.0, temperature -29℃-425℃), and the valve body material must pass intergranular corrosion testing (for sulfur-containing media).
| Feature | API 608 | API 598 |
|---|---|---|
| Standard Scope | Design, manufacturing, and testing of ball valves | General procedures for valve inspection and testing (including leak testing) |
| Primary Purpose | Specify dimensional, material, and performance requirements (e.g., pressure ratings) for ball valves | Define acceptance criteria for valve pressure testing, leakage rates, etc. |
| Applicable Valve Types | Ball valves only | General valves (e.g., gate valves, ball valves, globe valves) |
| Core Content | Design specifications, manufacturing tolerances, functional testing | Testing methods (pneumatic/hydraulic testing), leak detection, reporting requirements |
| Common Application Scenarios | Production and selection of ball valves in oil and gas industries | Valve factory inspection, quality control, or certification (e.g., ISO certification) |
API 608 Valve and API 598 Valve in stock
