What Is Fitness-for-Service (FFS) Assessment?
Pressure vessels, pipelines, and structures develop flaws during service — cracks, corrosion, wall thinning. When an inspection finds such a flaw, engineers face one key question: Can this equipment keep running? If so, for how long? This is exactly what Fitness-for-Service (FFS) assessment answers. The Limit of Traditional Rules Traditional design codes (such as ASME or GB 150) are written for new, flaw-free equipment. When a flaw is found, the codes often say: “out of tolerance — repair or retire.” ...