ISO 14313 Plug Valves
What ISO 14313 requires for plug valves — applicability, key and testing requirements, the alternative standards, and compliant supply with full certification.
What does ISO 14313 require for plug valves?
ISO 14313 (Petroleum and Natural Gas Industries - Pipeline Transportation Systems - Pipeline Valves, International Organization for Standardization (ISO)) sets the design, material and testing requirements for plug valves in its scope. ISO 14313 is the international standard for pipeline valves used in petroleum and natural gas transportation systems, published as the ISO counterpart to API 6D. In practice, ISO 14313 and API 6D are technically harmonised - the ISO standard adopts the API 6D requirements but presents them in the ISO publication format preferred by European and international oil and gas companies. Major operators such as Shell, TotalEnergies, BP, and European national oil companies frequently specify ISO 14313 in their pipeline engineering standards, while the underlying design and testing requirements are identical to the equivalent API 6D edition.
Applicable Pressure Classes
Key Requirements
- Requirements fully harmonised with API 6D - same design, testing, and documentation criteria
- Full-bore piggable design for pipeline mainline block valves
- Body cavity pressure relief (BCR) provision to prevent over-pressurisation of trapped liquid
- Anti-static device between rotating element and body with continuity test requirement
- Emergency sealant injection on stem and body seats
- Double-block-and-bleed (DBB) capability for isolation service classes
- Fire-safe design per ISO 10497 or API 6FA when specified
- Low-emission stem packing per ISO 15848-1/2 when emission class is specified
Testing Requirements
- Shell test: 1.5× rated pressure, 15 minutes minimum, zero leakage
- Seat leakage test: 1.1× rated pressure, acceptance per ISO 5208 rate A or B
- Anti-static continuity test: ≤10 ohms across stem-ball/disc-body
- Functional test: open-close-open cycle under rated pressure
Alternative Standards for Plug Valves
Other standards that also govern plug valves — useful for spec cross-acceptance.
Connected Engineering
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