Nace Rp0472 Pdf !link! -

The document has been updated several times (1995, 2005, 2010, 2015, 2020) and is now known as SP0472:2015(R2020). Suggested Post: Understanding NACE SP0472 (RP0472)

Providing guidelines for "in-service" welding and repairs to existing carbon steel equipment. nace rp0472 pdf

: Hardness must not exceed 248 Hv10 (Vickers). Since production testing of the HAZ is difficult, it is controlled through base metal chemistry (limiting carbon equivalent), post-weld heat treatment (PWHT), or specific "thermal methods" like cooling time control. Residual Stress Reduction for ASCC : The document has been updated several times (1995,

| Exposure (days) | Baseline UTS (MPa) | Post‑exposure UTS (MPa) | % Loss | |-----------------|-------------------|-------------------------|--------| | 30 | 550 | 531 | 3.5 % | | 90 | 550 | 514 | 6.5 % | | 180 | 550 | 492 | 10.5 % | Since production testing of the HAZ is difficult,

| Standard | Focus | |----------|-------| | NACE MR0175/ISO 15156 | Materials for sour service | | NACE SP0102 | In-service inspection of refinery equipment | | API 571 | Damage mechanisms in refineries | | API 582 | Welding guidelines for corrosive service | | ASME B31.3 (Appendix W) | Welding for severe cyclic/corrosive service |