Issuing body
API
Latest edition
5th Edition (2022)
Region
USA, Global
Equipment items
4
Scope
In-service inspection, rating, repair and alteration of process piping.
Key requirements (7)
- Applies to in-service process piping (B31.3 scope typical).
- Piping classified Class 1 (severe), 2 (most), 3 (less severe) by service.
- Thickness inspection intervals: Class 1 ≤ 5 yr, Class 2 ≤ 10 yr, Class 3 ≤ 10 yr (or ½ life).
- External inspection: Class 1/2 ≤ 5 yr, Class 3 ≤ 10 yr.
- CUI inspection mandatory in -12 °C to 175 °C range for insulated CS piping.
- Injection points and dead legs flagged as high-priority TMLs.
- Authorized Piping Inspector (API 570 ICP) certification required.
Related standards (1)
Applied to 4 equipment items
Piping & Fittings
Inspection & Process Safety