API 510

Key requirements (8)

• Applies to in-service pressure vessels covered originally by ASME VIII or other recognized code.
• Inspection intervals: external ≤ 5 years, internal ≤ 10 years OR ½ remaining life — whichever is less.
• On-stream UT inspection can replace internal at user's choice if conditions permit.
• Authorized Inspector (AI) certification required for inspection signoff (API ICP).
• Repair/alteration must follow original construction code; reratings allowed via re-calculation + hydrotest waiver if conditions met.
• RBI per API 580/581 may justify extended intervals beyond default limits.
• Damage mechanisms reference: API 571.
• Fitness-For-Service per API 579 when defects exceed acceptance limits.