PED vs ASME vs API vs ISO: Which Standard Is Strictest?
PED vs ASME vs API vs ISO: Comparing PVF Standards
Published: April 10, 2026 | Category: Industry Standards
Quick Answer
For Europe: PED 2014/68/EU (strictest on documentation). For North America: ASME + API. For international: ISO 9001 + NACE.
PED 2014/68/EU
What: EU legislation for pressure equipment.
Requirements: CE marking, Category I-IV, Notified Body, EN 10204 3.1/3.2, Full traceability.
Strictest: Documentation and conformity assessment.
ASME
Standards: B16.5, B16.47, Section VIII, B31.3.
Requirements: U Stamp, Dimensional compliance, P-T ratings, Hydrostatic testing.
Strictest: Dimensional tolerances.
API
Standards: API 6A, 6D, 17D, 5L.
Requirements: PSL 1-4, Performance testing, NDT, API Q1.
Strictest: Performance testing and sour service materials.
ISO
Standards: ISO 9001, ISO 15156/NACE MR0175.
Requirements: QMS certification, H₂S materials, Hardness limits.
Strictest: Materials for sour service.
Comparison Table
| Aspect | PED | ASME | API | ISO |
|---|---|---|---|---|
| Documentation | ★★★★★ | ★★★☆☆ | ★★★★☆ | ★★★☆☆ |
| Dimensions | ★★★☆☆ | ★★★★★ | ★★★★☆ | ★★★☆☆ |
| Material Testing | ★★★★☆ | ★★★☆☆ | ★★★★★ | ★★★★★ |
| 3rd Party | ★★★★★ | ★★★☆☆ | ★★★★☆ | ★★★☆☆ |
Songhai Capabilities
- PED 2014/68/EU – CE marked
- ASME B16.5/B16.47
- API 6A PSL 1-3
- ISO 9001:2008
- NACE MR0175
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