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Oil and Gas 17 April 2026 11 min read ISO Xpert Team Last updated 30 June 2025

API Q1 and Q2 Compliance: Complete Guide for Oil and Gas Quality Management

API Spec Q1 and API Spec Q2 are the quality management system standards for the oil and gas industry - Q1 for manufacturing organisations and Q2 for service supply organisations. Together, they form the backbone of quality compliance in the oilfield sector.

"In oil and gas, quality failures don''t just cost money - they cost lives. API Q1 and Q2 exist to prevent that."
- ISO Xpert

API Q1 vs Q2: Key Differences

AspectAPI Spec Q1API Spec Q2
ScopeManufacturing of oilfield equipmentService supply organisations
FocusProduct quality, design validationService quality, execution planning
MonogramAPI Monogram eligibleNot Monogram-linked
Key clauseDesign verification and validationService execution and contingency
IndustriesPipe, valves, wellheads, BOPsWireline, cementing, inspection, testing

Certification Process for API Q1/Q2

  1. Gap analysis against the latest edition of Q1 or Q2
  2. Documentation - quality manual, procedures, MOC, contingency plans
  3. Implementation - train your team, embed risk-based planning
  4. Internal audit - verify readiness and close gaps
  5. API audit - conducted by API auditors (not a third-party CB)
  6. Licence/registration issued by API

Common Nonconformities

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