ISO 14313 covers similar types of valves and shares several principles with API 6D, such as design, testing, and documentation requirements. The ISO 14313 standard is more focused on providing a universal framework that can be applied across different geographical regions and industries.
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API 6D and ISO 14313 Valve standard Comparison Table
| Feature | API Specification 6D | ISO 14313 |
| Origin | American Petroleum Institute (USA) | International Organization for Standardization |
| Scope | Pipeline valves (Ball, Gate, Check, Plug) | Pipeline valves (Identical Scope) |
| Technical Content | Identical to ISO 14313 | Identical to API 6D |
| Global Acceptance | Gold standard in the Oil & Gas industry | Preferred in Europe & International Tenders |
| Certification Cost | Higher (Requires API Monogram license) | Varies (Based on 3rd party auditors) |
| Marking | API Monogram (if licensed) | ISO CE or other markings |
API 6D vs. ISO 14313: Are They Interchangeable? Full Comparison Table
General Design Parameters
| Feature | API Specification 6D (25th Edition) | ISO 14313 (Pipeline Valves) |
| Valve Types Covered | Ball, Gate, Check, and Plug Valves | Ball, Gate, Check, and Plug Valves |
| Primary Application | Midstream Pipelines & Stations | Pipeline Transportation Systems |
| Design Reference | ASME B16.34 | ISO 17292 / EN 12516 |
| End Connections | Flanged (ASME B16.5 / B16.47) | Flanged (ISO 7005-1) |
| Butt-Weld Ends | ASME B16.25 | ISO 9606-1 |
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Size & Pressure Rating Mapping
| Parameter | API 6D (Imperial) | ISO 14313 (Metric Equivalent) |
| Nominal Size | NPS 2" to NPS 60" | DN 50 to DN 1500 |
| Pressure Class/PN | Class 150 | PN 20 |
| Pressure Class/PN | Class 300 | PN 50 |
| Pressure Class/PN | Class 400 | PN 64 |
| Pressure Class/PN | Class 600 | PN 100 |
| Pressure Class/PN | Class 900 | PN 150 |
| Pressure Class/PN | Class 1500 | PN 250 |
| Pressure Class/PN | Class 2500 | PN 420 |
Key Technical & Performance Specifications
| Technical Feature | API 6D Requirement | ISO 14313 Requirement |
| Face-to-Face (FTF) | Per ASME B16.10 or API 6D Annex | Per ISO 5752 or ISO 14313 Annex |
| Full Bore Requirements | Min. bore per table (Pigging capability) | Min. bore per table (Identical to API) |
| Sour Service (NACE) | MR0175 / ISO 15156 Compliance | ISO 15156 Compliance |
| Fire-Safe Design | API 607 / API 6FA | ISO 10497 |
| Operation Type | Lever, Gear, Pneumatic, Electric, Hydraulic | Lever, Gear, Pneumatic, Electric, Hydraulic |
Mandatory Testing Parameters
| Test Description | API 6D Requirement | ISO 14313 Requirement |
| Hydrostatic Shell Test | 1.5 x Rated Pressure | 1.5 x Rated Pressure |
| High-Pressure Seat Test | 1.1 x Rated Pressure | 1.1 x Rated Pressure |
| Low-Pressure Seat Test | 80 psi (5.5 bar) | 5.5 bar (± 0.5 bar) |
| DBB / DIB Testing | Optional (Mandatory if specified) | Optional (Mandatory if specified) |
| Test Duration | Increases with valve size (e.g., 30 min for NPS 24") | Substantially identical to API 6D |
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FAQ
What is the difference between API 6D and API 607?
API 607 ball valves are typically used in high-risk conditions such as chemical, petrochemical, and oil and gas industries. API 6D, on the other hand, focuses on ball valves used in pipeline transportation systems, covering aspects such as design, manufacturing, testing, and operation.
What is the API standard for ball valves?
Specification for pipeline valves (gate, ball, plug, and check valves) API 6D is the primary standard for valves used in main line pipeline service, including gate, ball, plug and check valves. Occasionally refinery and petrochemical purchasers will reference the more stringent testing requirements of API 6D.
What is the difference between API 6D and API 599?
API 6A and API 6D plug valves are designed for high-pressure environments, whereas API 599 plug valves are suitable for lower-pressure applications. Understanding the system's pressure and temperature requirements is critical when choosing a valve.